Starting - Electrical Diagnostics

STARTING - ELECTRICAL DIAGNOSTICS

For complete wiring diagrams, refer to SYSTEM WIRING DIAGRAMS article.

When Monitored:

Continuously

Set Condition:

When the TIPM senses the Hood Ajar Switch Sense circuit is open this code will set.

NOTE: Open the hood and ensure the Hood Ajar Switch is connected before proceeding

With the scan tool, record and erase DTC's

Close the hood.

Cycle the ignition from on to off.

Turn the ignition on.

Open then close the hood.

With the scan tool, read DTC's.

Does the scan tool display B1820-HOOD AJAR INPUT CIRCUIT HIGH?

Yes

Go To step 2).

No

The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. Perform BODY VERIFICATION TEST - VER 1 . 2) HOOD AJAR SWITCH OPEN

Disconnect the Hood Ajar Switch harness connector.

Depress the plunger of the hood ajar switch and measure the resistance between the two terminals of the switch.

Is the resistance approximately 1K ohms?

Yes

Go To step 3).

No

Replace the Hood Ajar Switch. Perform BODY VERIFICATION TEST - VER 1 . 3) (G931) GROUND CIRCUIT OPEN

Using a 12-volt Test Light connected to 12-volts, check the (G931) Ground circuit.

Does the test light illuminate?

Yes

Go To step 4).

No

Repair the (G931) Ground circuit for an open. Perform BODY VERIFICATION TEST - VER 1 .

4) (G70) HOOD AJAR SWITCH SENSE CIRCUIT SHORT TO VOLTAGE

Disconnect the TIPM C4 connector.

Turn the ignition on.

Measure the voltage between the (G70) Hood Ajar Switch Sense circuit and ground.

Is there any voltage present?

Yes

Repair the (G70) Hood Ajar Switch Sense circuit for a short to voltage. Perform BODY VERIFICATION TEST - VER 1 .

No

Go To step 5). 5) (G70) HOOD AJAR SWITCH SENSE CIRCUIT OPEN

Connector And Hood Ajar Switch Connector

Turn the ignition off.

Measure the resistance of the (G70) Hood Ajar Switch Sense circuit between the TIPM C4 connector and the Hood Ajar Switch connector.

Is the resistance below 2.0 ohms?

Yes

Replace the Totally Integrated Module (TIPM) in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1 .

No

Repair the (G70) Hood Ajar Switch Sense circuit for an open. Perform BODY VERIFICATION TEST - VER 1 .

*REMOTE START INOPERATIVE

For complete wiring diagrams, refer to SYSTEM WIRING DIAGRAMS article.

1) REMOTE START PARAMETERS NOT MET / FAULTY COMPONENT

Refer to the Data Display in the scan tool to view possible causes of the inoperative Remote Start System.

Repair

See the following list below for possible causes for the inoperative Remote Start System: ABORT BATTERY VOLTAGE HIGH BATTERY VOLTAGE LOW BRAKE PRESSED COOLANT TEMPERATURE HIGH CRANK NO START DRIVER DOOR AJAR EXCESSIVE GLOW PLUG TIME (DIESEL ONLY) FAILED COUNTER REACHED (START) HAZARD LAMPS (SWITCH PRESSED) HOOD AJAR IGNITION IN RUN/START IGNITION NOT IN LOCK IGNITION SNA (SIGNAL NOT AVAILABLE FROM OTHER MODULE) INVALID KEY KEY IN IGNITION LEFT REAR DOOR AJAR LOW RPM SHUTDOWN MIL ON NO AUTOMATIC TRANSMISSION NO HOOD SWITCH (INOPERATIVE) NORMAL TIME OUT CUSTOMER ACCESS NORMAL TIME OUT RUN MODE (15 MINUTES) NOT CONFIGURED

NOT ENABLED NOT IN PARK OR NEUTRAL NOT PROGRAMMED OIL PRESSURE LOW PANIC MODE (ACTIVATED) PASSENGER DOOR AJAR POWER LOSS RIGHT REAR DOOR AJAR RKE OFF MESSAGE RPM TOO HIGH (EXCEEDS 2500) START COUNTER REACHED TRUNK/LIFTGATE AJAR VEHICLE SPEED HIGH VTA ALARMING

If all of the previous items checked OK, and the remote starting system will not operate, refer to *REMOTE START INOPERATIVE-ANTENNA for further information.

*REMOTE START INOPERATIVE-ANTENNA

For complete wiring diagrams, refer to SYSTEM WIRING DIAGRAMS article.

The customer may notice that the signal range of the Remote Keyless Entry (RKE) system is reduced. The RKE key fob may need to be closer than 3 meters (10 feet) before the functions available on the key fob will operate. This condition may be due to the RKE antenna. The diagnostic flow chart is provide as a diagnostic aid for dealer technician.

1) LOCK/UNLOCK FUNCTION

NOTE: For all RKE tests, the key must be out of the ignition.

Does the Lock/Unlock function with the interior door switches?

Yes

Go To step 2).

No

Perform Power Lock/Unlock System diagnosis.

2) RKE FUNCTION AT 20 FEET

Does the RKE Function at 20 feet?

Yes

Go To step 3).

No

Go To step 4). 3) RKE FUNCTION AT 100 FEET

Does the RKE Function at 100 feet?

Yes

Test complete.

No

Replace the antenna in accordance with the service information. 4) WCM DTCS

Does the WCM display any DTCs?

Yes

Perform WCM diagnosis.

No

Go To step 5). 5) RKE FUNCTION INSIDE VEHICLE

Sit inside the vehicle.

Push the Key Fob RKE Lock/Unlock buttons.

Does the RKE Lock/Unlock work?

Yes

Go To step 6).

No

Go To step 9). 6) ANTENNA COAX CABLE NOT PROPERLY CONNECTED

Pull on the Antenna COAX cable connector at the WCM.

Did the connector come off without releasing the lock tab (not properly seated)?

Yes

Connect Antenna Go To step 2).

No

Go To step 7). 7) VERIFY COAX CONNECTION AT WCM

Pull Antenna connector off WCM. Verify no bent pins.

Are there any bent pins?

Yes

Replace antenna. Go To step 2).

No

Go To step 8). 8) PINCHED WIRE

Inspect the ANTENNA Lead COAX Cable for a pinched wire.

Has the COAX cable been pinched or damaged?

Yes

Replace antenna. Go To step 2).

No

Perform WCM diagnostics. 9) RKE FUNCTION INSIDE VEHICLE

Disconnect the Antenna COAX Cable lead connector to WCM.

Sit inside the vehicle. Push the RKE Key Fob Lock/Unlock buttons.

Does the RKE Lock/Unlock work?

Yes

Replace the antenna.

No

Go To step 10). 10) CHECK FOR 12 VOLTS AT WCM

Connect the Antenna Lead to WCM.

Disconnect the WCM harness connector.

Using the appropriate wiring diagrams, check for Fused B+ at the WCM harness connector.

Is Fused B+ present?

Yes

Perform WCM diagnostics.

No

Repair the appropriate circuits.