Power Seats - Service Information

POWER SEATS - SERVICE INFORMATION📷 1

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POWER SEAT SYSTEM📷 3

NOTE: Driver seat shown in illustration, passenger seat similar.

The power seat system allows the driver and front seat passenger to electrically adjust the seating position using the power seat switch assembly (2) located on the outboard seat cushion side shield (3).

A driver side six-way power seat is available on this vehicle. The power seat includes a six-way adjustable seat cushion track. The six-way power seat can be adjusted back up, back down, front up, front down, forward and rearward. A two-way front passenger seat is also available as an option. The front passenger seat can be adjusted forward and rearward only. The power seat system is also available with the heated seat option. Refer to DESCRIPTION for additional information on the heated seats.

The power seat adjuster can be made up of the upper and lower power seat adjuster assemblies. The upper power seat adjuster (1) is used for the driver power seat only. It contains two reversible motors that are connected to worm-drive gearboxes that move the seat adjusters through screw-type drive units. These motors control the front seat tilt, rear seat tilt and when activated together the height of the driver seat. The lower power seat adjuster (2) is used on both the driver and front passenger power seats. It contains one reversible motor that is connected to a worm-drive gearbox that moves the seat adjuster through a screw-type drive unit. This motor is responsible for the fore and aft movement of the driver seat. Each motor contains a self-resetting circuit breaker to protect it from overload. Consecutive or frequent resetting of the circuit breakers may damaged the motors.

The power seat system for this vehicle includes the following major components:

The Front Tilt Motor (2) is located on the upper power seat adjuster assembly and controls the up and down movement of the seat front only. The front tilt motor is part of the power seat track unit (1) and must be replaced as an assembly. See REMOVAL.

The Rear Tilt Motor (3) is located on the upper power seat adjuster assembly and controls the up and down movement of the seat rear only. The front tilt motor is part of the power seat track unit (1) and must be replaced as an assembly. See REMOVAL.

The Lower Power Seat Adjuster contains one reversible motor (4) that is connected to a worm-drive gearbox that moves the seat adjuster through a screw-type drive unit. This motor is responsible for the fore and aft movement of the driver seat. The motor is part of the power seat track unit (1) and must be replaced as an assembly. See REMOVAL.

Power Seat Switch - Vehicles may be equipped with a driver side six-way power seat switch. The power seat switch has a paddle-type lever mounted on the outboard seat side shield. Movement of the seat cushion mimics the action of the switch paddle.

MEMORY SEAT SYSTEM📷 1

An electronic memory seat system is available on certain models. The memory system is able to store and recall all driver side power seat positions and driver outside mirror position. The system can be set for two different drivers. On vehicles with a factory installed radio connected to the Controller Area Network (CAN) data bus network, the memory system is also able to store and recall up to twelve radio station presets (six AM and six FM), for two drivers. The memory system will also store and recall the last station listened to for each driver, even if it is not one of the twelve preset stations.

The memory system will automatically recall all of these settings when a button of the memory switch is depressed, or when the doors are unlocked using the Remote Keyless Entry (RKE) transmitter (if enabled). If the vehicle has more than two drivers the RKE transmitter recall of memory features can be disabled. This is a customer programmable feature of the Electronic Vehicle Information Center (EVIC) set through the use of the appropriate steering wheel switches. Refer to OPERATION for additional information on the customer programmable features.

The memory system also has an "Easy Entry and /Exit" feature that provides the driver with more room to enter or exit the vehicle. When the seat is in a memorized position, it will move rearward 60 millimeters or to the end of its travel, whichever occurs first, when the key is removed from the ignition switch lock cylinder. This is also a customer programmable feature of the Electronic Vehicle Information Center (EVIC) set through the use of the appropriate steering wheel switches.

The memory system includes the following components:

Memory Selector Switch - located in the driver door trim panel. Driver Door Module (DDM) - located in the driver door, behind the trim panel. Hall Effect Sensors - Outside Mirror - The hall effect sensor is permanently installed on the outside mirror motor. This hall effect sensor is used to provide a reference signal to the memory seat module, letting the module know the exact position of the mirror. Sentry Key Remote Entry Module (SKREEM) - located at ignition key cylinder. Remote Keyless Entry (RKE) Transmitter - located with ignition key. Memory Seat Module (MSM) - located underneath the driver seat and also controls the Adjustable Pedals. Hall Effect Sensors - Seat Track - These hall effect sensors are permanently installed in each of the power seat track motors. They are used to provide a reference signal to the memory heated seat mirror module, letting the module know the exact position of the seat cushion and recliner. Radio - located in the instrument panel center stack.

Certain functions and features of the memory system rely upon resources shared with other electronic modules in the vehicle over the Controller Area Network (CAN) bus. The CAN bus allows the sharing of sensor information. This helps to reduce wire harness complexity, internal controller hardware, and component sensor current loads. At the same time, this system provides increased reliability, enhanced diagnostics, and allows the addition of many new feature capabilities. For diagnosis of these electronic modules or of the CAN bus, the use of a scan tool and the proper diagnostic procedures information are needed.

POWER SEAT SYSTEM

The power seat system receives battery current through a fuse in the Totally Integrated Power Module (TIPM) so that the power seats remain operational, regardless of the ignition switch position.

When a power seat switch is actuated, a battery feed and a ground path are applied through the power seat switch contacts to the appropriate motor or motors. The motor and drive unit operate to move the seat in the selected direction until the switch is released, or until the travel limit of the power seat track is reached. When

the switch is moved in the opposite direction, the battery feed and ground path to the motor is reversed through the switch contacts. This causes the motor to run in the opposite direction.

MEMORY SEAT SYSTEM

In order to obtain conclusive testing of the power seats with and without the memory system option, the Controller Area Network (CAN) bus, and all of the electronic modules that provide inputs to, or receive outputs from the memory system components must be checked. Use a scan tool and the proper diagnostic information to accurately diagnose the power seat/memory seat systems.

If the driver power seat exhibits an interrupted or jerky motion, ensure the wire harness is connected correctly. To verify the concern, obtain a scan tool and energize each axis one at a time. If any axis stops in approximately 2 seconds (without hitting the end of travel), the feedback for that axis may have an open, short or be incorrectly connected. Check the wiring to that axis (module to motor). Repair any wiring problems and retry that axis. Refer to appropriate wiring information for complete circuit schematic or connector pin-out information.

NOTE: Vehicles equipped with the memory/heated seat option utilize a low voltage cut- off feature. This feature turns off the 12V power to the power seat system anytime vehicle voltage is below 11.0V. Be certain to check the vehicle electrical system for proper voltage anytime the power seat system appears inoperative.

Before any testing of the power seat system is attempted, the battery should be fully-charged.

POWER SEAT ADJUSTER

Operate the power seat switch and move the seat in all directions. The seat should move in each of the selected directions.

If the power seat adjuster fails to operate in more than one direction, proceed as follows:

1. Inspect the power seat adjuster motors to ensure the electrical connectors are fully seated to the motors. If OK, go to step 2. If not OK, connect the electrical connector to the fully seated position. 2. Check the power seat fuse in the Totally Integrated Power Module (TIPM). If OK, go to step 3. If not OK, replace the inoperative fuse. 3. Remove the power seat switch from the seat cushion side panel. Check for battery voltage at the fused B (+) circuit cavity of the power seat switch wire harness connector. If OK, go to step 4. If not OK, repair the open circuit to the TIPM as required. 4. Check for continuity between the ground circuit cavity of the power seat switch wire harness connector and a good ground. There should be continuity. If OK, go to step 5. If not OK, repair the open circuit to ground as required. 5. See DIAGNOSIS AND TESTING. If the switch tests OK, check the wire harness between the power seat switch and the motor. If the circuits check OK, replace the faulty power seat motor, track or seat back frame assembly. If the circuits are not OK, repair the wire harness as required.

SYMPTOM POSSIBLE CAUSE CORRECTION

Check for damaged wiring and possible circuit short, Refer to the appropriate Power seat inoperative in all Blown Fuse or inoperative wiring information for complete circuit directions circuit breaker schematic or connector pin-out information. Repair as necessary Perform appropriate power seat switch - Power seat switch test. See DIAGNOSIS AND TESTING. Replace switch as necessary. Check for loose wire connections or damaged wiring, Refer to the appropriate Wiring problems (system or - wiring information for complete circuit vehicle) schematic or connector pin-out information. Repair as necessary Perform appropriate power seat switch Fore/aft seat movement Power seat switch test. See DIAGNOSIS AND TESTING. completely inoperative Replace switch as necessary Fore aft motor or flex drive - Replace the power seat track assembly. cable. Check for loose wire connections or damaged wiring, Refer to the appropriate Wiring problems (system or - wiring information for complete circuit vehicle) schematic or connector pin-out information. Repair as necessary Perform appropriate power seat switch Up/down seat movement Power seat switch test. See DIAGNOSIS AND TESTING. completely inoperative Replace switch as necessary Height adjust motor or drive - Replace the power seat track assembly.

Assembly

Check for loose wire connections or damaged wiring, Refer to the appropriate Wiring problems (system or - wiring information for complete circuit vehicle) schematic or connector pin-out information. Repair as necessary Perform appropriate power seat switch Seat tilt movement completely Power seat switch test. See DIAGNOSIS AND TESTING. inoperative Replace switch as necessary Front tilt motor or drive - Replace the power seat track assembly.

Assembly

Seat power recline movement test. See DIAGNOSIS AND TESTING. Power seat switch

completely inoperative                                       Replace switch as necessary
                              Recline motor or drive         Replace the power seat back frame

- assembly assembly. Check for loose wire connections or damaged wiring, Refer to the appropriate Wiring problems (system or - wiring information for complete circuit vehicle) schematic or connector pin-out information. Repair as necessary

Seat motion chattering or     Foreign material under seat or Remove foreign material. Clean and
vibrating during fore/aft     in seat track                  lubricate seat tracks as necessary

movement Poor seat track lubrication Lubricate the lower portion of the - effected seat tracks Loose components Check and tighten loose components as - necessary

                              Binding or sticking of         Loosen seat track to vehicle mounting
                              components                     bolts. Using the power seat switch, move

the effected seat reward to the track stops. - Tighten track bolts to proper torque and recheck seat operation. If seat motion is still abnormal, replace the power seat track assembly. Fore aft motor or flex drive - Replace the power seat track assembly. cable. Check for loose wire connections or damaged wiring, Refer to the appropriate Wiring problems (system or - wiring information for complete circuit vehicle) schematic or connector pin-out information. Repair as necessary Seat motion chattering or Remove foreign material. Clean and Foreign material under seat or vibrating during up/down lubricate upper seat track pivots as in upper seat track pivots

movement                                                     necessary
                              Poor upper seat track pivot    Lubricate the effected upper seat track

                              lubrication                    pivots
                              Poor height adjust motor       Lubricate the height adjust motor drive

- drive assembly lubrication assembly Check and tighten loose components as - Loose components necessary Inspect and lubricate the effected upper Binding or sticking of seat track pivots. Recheck seat operation. - components If seat motion is still abnormal, replace the power seat track assembly. height adjust motor or drive - Replace the power seat track assembly.

Assembly

movement                                                      necessary
                               Poor upper seat track pivot    Lubricate the effected upper seat track

                               lubrication                    pivots
                               Poor front tilt motor drive    Lubricate the front tilt motor drive

- assembly lubrication assembly Check and tighten loose components as - Loose components necessary Inspect and lubricate the effected upper Binding or sticking of seat track pivots. Recheck seat operation. - components If seat motion is still abnormal, replace the power seat track assembly. Front tilt motor or drive - Replace the power seat track assembly.

Assembly

Check for loose wire connections or damaged wiring, Refer to the appropriate Wiring problems (system or - wiring information for complete circuit vehicle) schematic or connector pin-out information. Repair as necessary Seat motion chattering or Remove foreign material. Clean and Foreign material in seat back vibrating during power recline lubricate seat back frame pivots and drive frame pivots or drive shaft movement shaft as necessary Poor seat back frame pivot or Lubricate the seat back frame pivots and - drive shaft lubrication drive shaft Check and tighten loose components as - Loose components necessary Inspect and lubricate the effected seat back frame pivots and drive shaft. Binding or sticking of - Recheck seat operation. If seat motion is components still abnormal, replace the seat back frame

Assembly

Recline motor or drive - Replace the seat back frame assembly.

Assembly

Check for loose wire connections or damaged wiring, Refer to the appropriate Wiring problems (system or - wiring information for complete circuit vehicle) schematic or connector pin-out information. Repair as necessary Check vehicle charging system operation. Battery voltage low Slow seat motion during Repair charging system and charge

fore/aft movement battery as necessary Check for loose ground connections or damaged wiring, Refer to the appropriate Poor power seat system - wiring information for complete circuit ground schematic or connector pin-out information. Repair as necessary Foreign material under seat or Remove foreign material. Clean and - in seat track lubricate seat tracks as necessary Lubricate the lower portion of the - Poor seat track lubrication effected seat tracks Check and tighten loose components as - Loose components necessary Loosen seat track to vehicle mounting bolts. Using the power seat switch, move the effected seat reward to the track stops. Binding or sticking of - Tighten track bolts to proper torque and components recheck seat operation. If seat motion is still abnormal, replace the power seat track assembly. Fore aft motor or flex drive - Replace the power seat track assembly. cable. Check for loose wire connections or damaged wiring, Refer to the appropriate Wiring problems (system or - wiring information for complete circuit vehicle) schematic or connector pin-out information. Repair as necessary Check vehicle charging system operation. Slow seat motion during Battery voltage low Repair charging system and charge up/down movement battery as necessary Check for loose ground connections or damaged wiring, Refer to the appropriate Poor power seat system - wiring information for complete circuit ground schematic or connector pin-out information. Repair as necessary Remove foreign material. Clean and Foreign material under seat or - lubricate upper seat track pivots as in upper seat track pivots necessary Poor upper seat track pivot Lubricate the effected upper seat track -

                          lubrication                    pivots
                          Poor height adjust motor       Lubricate the height adjust motor drive

- drive assembly lubrication assembly Check and tighten loose components as - Loose components necessary Inspect and lubricate the effected upper Binding or sticking of - seat track pivots. Recheck seat operation. components If seat motion is still abnormal, replace

the power seat track assembly. Height adjust motor or drive - Replace the power seat track assembly.

Assembly

Check for loose wire connections or damaged wiring, Refer to the appropriate Wiring problems (system or - wiring information for complete circuit vehicle) schematic or connector pin-out information. Repair as necessary Check vehicle charging system operation. Slow seat motion during seat Battery voltage low Repair charging system and charge tilt movement battery as necessary Check for loose ground connections or damaged wiring, Refer to the appropriate Poor power seat system - wiring information for complete circuit ground schematic or connector pin-out information. Repair as necessary Remove foreign material. Clean and Foreign material under seat or - lubricate upper seat track pivots as in upper seat track pivots necessary Poor upper seat track pivot Lubricate the effected upper seat track -

                              lubrication                    pivots
                              Poor front tilt motor drive    Lubricate the front tilt motor drive

Assembly

Check for loose wire connections or damaged wiring, Refer to the appropriate Wiring problems (system or - wiring information for complete circuit vehicle) schematic or connector pin-out information. Repair as necessary Check vehicle charging system operation. Slow seat motion during power Battery voltage low Repair charging system and charge recline movement battery as necessary Check for loose ground connections or damaged wiring, Refer to the appropriate Poor power seat system - wiring information for complete circuit ground schematic or connector pin-out information. Repair as necessary Remove foreign material. Clean and - Foreign material in seat back lubricate seat back frame pivots and drive

frame pivots or drive shaft shaft as necessary Poor seat back frame pivot or Lubricate the seat back frame pivots and - drive shaft lubrication drive shaft Check and tighten loose components as - Loose components necessary Inspect and lubricate the effected seat back frame pivots and drive shaft. Binding or sticking of - Recheck seat operation. If seat motion is components still abnormal, replace the seat back frame

Assembly

Recline motor or drive - Replace the seat back frame assembly.

Assembly

Squeaks, noises and rattles   Foreign material under seat or Remove foreign material. Clean and
during fore/aft movement      in seat track                  lubricate seat tracks as necessary

Lubricate the lower portion of the - Poor seat track lubrication effected seat tracks Check and tighten loose components as - Loose components necessary Loosen seat track to vehicle mounting bolts. Using the power seat switch, move the effected seat reward to the track stops. Binding or sticking of - Tighten track bolts to proper torque and components recheck seat operation. If seat motion is still abnormal, replace the power seat track assembly. Fore aft motor or flex drive - Replace the power seat track assembly. cable. Remove foreign material. Clean and Squeaks, noises and rattles Foreign material under seat or lubricate upper seat track pivots as during up/down movement in upper seat track pivots necessary Poor upper seat track pivot Lubricate the effected upper seat track -

                              lubrication                    pivots
                              Poor height adjust motor       Lubricate the height adjust motor drive

height adjust motor or drive - Replace the power seat track assembly.

Assembly

Remove foreign material. Clean and Squeaks, noises and rattles Foreign material under seat or lubricate upper seat track pivots as during seat tilt movement in upper seat track pivots necessary Poor upper seat track pivot Lubricate the effected upper seat track -

                              lubrication                    pivots
                              Poor front tilt motor drive    Lubricate the front tilt motor drive

Assembly

Remove foreign material. Clean and Squeaks, noises and rattles Foreign material in seat back lubricate seat back frame pivots and drive during power recline movement frame pivots or drive shaft shaft as necessary Poor seat back frame pivot or Lubricate the seat back frame pivots and - drive shaft lubrication drive shaft Check and tighten loose components as - Loose components necessary Inspect and lubricate the effected seat back frame pivots and drive shaft. Binding or sticking of - Recheck seat operation. If seat motion is components still abnormal, replace the seat back frame

Assembly

Recline motor or drive - Replace the seat back frame assembly.

MEMORY SYSTEM PROGRAMMING

The Memory Seat Module (MSM) interfaces with the Remote Keyless Entry (RKE) system via the Controller Area Network (CAN) bus. The proper procedure of setting and recalling a memory position using the RKE is as follows:

1. Press and release memory switch 1 or 2 to recall memory position 1 or 2. 2. Adjust the seat, recliner, adjustable pedal position, set radio station presets, and the side view mirrors to the desired position. 3. Press momentarily and release memory switch S. 4. Within five seconds, press momentarily and release memory switch 1.

5. To link the RKE transmitter: within ten seconds, press and release the "LOCK" button on one of the RKE transmitters

To program the second driver's position, repeat the above procedure using memory switch 2. The second RKE transmitter can be programmed in the same fashion as indicated in step 5.

NOTE: The module will abort a recall if the transmission is moved out of park or if any seat movement is activated whether manually or by memory recall. The module will also abort a recall if any movement of the adjustable pedals is detected.

To recall either of the programmed positions momentarily press and release either memory selector switch 1 or 2. If using RKE, just press and release the "UNLOCK" button on the proper transmitter for either position 1 or 2.

A recall is possible any time the vehicle transmission is in PARK and the seatbelt is unbuckled. This condition is monitored by the MSM.

SWITCH-MEMORY

SEAT SWITCH📷 1

NOTE: Driver seat switch shown in illustration, passenger seat switch similar.

The driver power seat can be adjusted in six different ways and the passenger power seat can be adjusted fore and aft using the power seat switch. The power seat switch (2) is located on the lower outboard side of the seat cushion (1) on the seat cushion side shield (3). The power seat system incorporates a seat switch with a seat cushion control paddle.

The individual components in the power seat switch assembly cannot be repaired. If the switch is damaged or inoperative, the entire power seat switch must be replaced.

SEAT SWITCH📷 1

When a power seat switch is actuated, a battery feed and a ground path are applied through the switch contacts to the power seat track adjuster motor. The selected adjuster motor operates to move the seat through its drive unit in the selected direction until the switch is released, or until the travel limit of the adjuster is reached. When the switch is moved in the opposite direction, the battery feed and ground path to the motor are reversed through the switch contacts. This causes the adjuster motor to run in the opposite direction.

No power seat switch should be held applied in any direction after the adjuster has reached its travel limit. The

power seat adjuster motors each contain a self-resetting circuit breaker to protect them from overload. However, consecutive or frequent resetting of the circuit breaker may result in motor damage.

DRIVER WITHOUT MEMORY SEAT SYSTEM📷 1

1. Disconnect and isolate the battery negative cable. 2. Remove the power seat switch from the power seat. See REMOVAL. 3. Use an ohmmeter to test the continuity of the power seat switch. Refer to DRIVER POWER SEAT SWITCH WITHOUT MEMORY SEAT SYSTEM CONTINUITY table. If not OK, replace the faulty power seat switch. If switch tests OK, see DIAGNOSIS AND TESTING.

PASSENGER SEAT📷 1

1. Disconnect and isolate the battery negative cable. 2. Remove the power seat switch from the power seat. See REMOVAL. 3. Use an ohmmeter to test the continuity of the power seat switch. Refer to PASSENGER POWER SEAT SWITCH CONTINUITY table. If not OK, replace the faulty power seat switch. If switch tests OK, see

DRIVER WITH MEMORY SEAT SYSTEM📷 1

1. Disconnect and isolate the battery negative cable. 2. Remove the power seat switch from the power seat. See REMOVAL. 3. Use an ohmmeter to test the resistance of the power seat switch. Refer to DRIVER POWER SEAT SWITCH WITH MEMORY SEAT SYSTEM CONTINUITY table. If not OK, replace the faulty power seat switch. If switch tests OK, see DIAGNOSIS AND TESTING.

ALL RESISTANCE VALUES ARE ± FIVE PERCENT

SEAT SWITCH📷 1

Electrical Harness Connector

  1.   Disconnect and isolate the battery negative cable.
  2.   Remove the outboard seat cushion side shield (3).
  3.   Disconnect the power seat switch electrical harness connector (4).
  4.   Using a small flat bladed tool, gently release the four mounting tabs (1) that secure the power seat switch

(2) and separate switch from side shield (3).

SEAT SWITCH📷 2

Electrical Connector

1. Position the power seat switch (2) onto the seat cushion side shield (3). Gently apply pressure to the switch until the four mounting tabs (1) are fully seated into place. 2. Connect the power seat switch electrical connector (4). 3. Install the seat cushion outboard side shield. 4. Connect the battery negative cable. 5. Verify normal operation of the power seat assembly.

TRACK - POWER SEAT

POWER SEAT TRACK📷 1

WARNING: Before proceeding with the following repair procedure, review all warnings and cautions. Refer to WARNING .

  1.   Disconnect and isolate the battery negative cable.
  2.   Remove the head rests to ease with seat removal.
  3.   Remove the side shield (4) to expose the seat belt bolts.
  4.   Position the recliner lever up and remove the seat belt bolts (2) and seat belts (3). Refer to REMOVAL .
  5.   Slide the seats back and remove the front bolts (1).
  6.   Disconnect the electrical connectors (5).

 7.   Slide the seats to forward position and remove the rear nuts (1) and bolts (2).
 8.   Remove the seats from the vehicle.
 9.   Remove bolts attaching seat frame to cushion pan.
10.   Disconnect wire harness fasteners from cushion pan.
11.   Remove seat back.
12.   Remove seat cushion tension springs.
13.   Remove power seat track nuts.
14.   Remove power seat track from riser.
15.   Remove any parts that need to be transferred to the new seat track assembly.

POWER SEAT TRACK📷 3

WARNING: Before proceeding with the following repair procedure, review all warnings and cautions. Refer to WARNING .

NOTE: Start all seat fasteners first before tightening to specifications.

1. Install the seats to the vehicle. 2. Install any parts that need to be transferred from the old seat track assembly. 3. Place power seat track in position on the seat frame ensuring motor is installed correctly into seat risers. 4. Install power seat track to seat riser nuts. 5. Install seat springs. 6. Connect wire harness fasteners to the cushion pan. 7. Install bolts attaching power seat track to cushion pan. 8. Install seat back. Tighten recliner bolts to 12 N.m (9 ft. lbs.) torque. Tighten pivot bolts to 40 N.m (30 ft. lbs.) torque. 9. Slide the seats to the rearward position, connect the electrical connectors (5) and install the bolts (1). 10. Tighten the inboard bolts first then tighten the outboard bolts (1) to 62 N.m (46 ft. lbs.). 11. Install the seat belts (3) and bolts (2). Refer to INSTALLATION .

 12.   Tighten the rear nuts (1) to 62 N.m (46 ft. lbs.).
 13.   Tighten the rear bolts (2) to 62 N.m (46 ft. lbs.).
 14.   Install the side shield (4) to the seats.
 15.   Install the head rest to the seats.

16. Do not reconnect the battery negative cable at this time. The supplemental restraint system verification test procedure should be performed following service of any supplemental restraint system component. Refer to STANDARD PROCEDURE . 17. Following successful completion of the supplemental restraint system verification test procedure, perform the Occupant Classification System Verification Test using a scan tool. 18. Verify normal operation of the power seat assembly.