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Ambient Light Sensor

Sensors and Switches › Sensors and Switches - Lighting and Horns
Unified entry — merged from multiple cross-listed pages in the original manual.

Parts

PartSentinel Sensor
ManufacturerCHY
OEM part #55111276AA
Price$19.35
Procedures
Light Rain Sensor Module (LRSM) - Removal6 steps
Fig. 1
Fig. 1
  1. Disconnect and isolate the battery negative cable.
  2. Remove the inside rear view mirror from the mounting button on the inside of the windshield glass. Interior Rearview Mirror - Removal.
  3. To remove the trim cover (4) from over the Light Rain Sensor Module (LRSM) mounting bracket (2) on the inside of the windshield near the inside rear view mirror, place a thumb over the top of the cover on each side of the wiring clearance notch and hook both index fingers on the lower end of the cover. Push firmly and evenly downward with your thumbs while simultaneously pulling the bottom of the cover away from the glass with your fingers.
  4. Disconnect the wire harness connector (1) from the LRSM (3).
  5. Depress one side of the spring steel retaining strap on the LRSM towards the windshield while lightly prying the end of the strap closest to the glass away from the tab of the mounting bracket on the windshield. Now rotate the loose side of the LRSM away from the glass far enough to disengage the other side of the strap from the mounting bracket tabs.
  6. Remove the LRSM from the mounting bracket.
Light Rain Sensor Module (LRSM) - Installation6 steps
△ CAUTION
During installation be certain not to touch or contaminate the optical lenses of the Light Rain Sensor Module (LRSM) or the glass through which the LRSM optics are focused. Contaminated optics will negatively impact LRSM performance.
Fig. 1
Fig. 1
  1. Position the Light Rain Sensor Module (LRSM) (3) to the center of the mounting bracket (2) on the inside of the windshield near the inside rear view mirror.
  2. Depress both sides of the spring steel retaining strap on the LRSM simultaneously until the hooks of the strap engage the tabs of the mounting bracket on the windshield.
  3. Reconnect the wire harness connector (1) to the LRSM.
  4. Align and snap the trim cover (4) over the LRSM mounting bracket.
  5. Reinstall the inside rear view mirror onto the mounting button on the inside of the windshield glass. Interior Rearview Mirror - Installation.
  6. Reconnect the battery negative cable.
Light Rain Sensor Module (LRSM) - Descriptionreference
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Fig. 1
DESCRIPTION The Light Rain Sensor Module (LRSM) (1) is the primary component of the automatic wiper system. In vehicles equipped with the automatic wiper system and the automatic headlamp system, the LRSM also performs the ambient light sensor function; and, therefore, is alternately referred to as the Light Sensor Module (LSM) or the Rain Sensor Module (RSM). The LRSM is located on the inside of the windshield just below and to the right of the inside rear view mirror mounting button. The LRSM is concealed from view within the vehicle interior by a molded plastic trim cover that snaps over the top of the LRSM housing onto the LRSM mounting bracket, but is visible through the windshield glass from the exterior of the vehicle. The molded black plastic LRSM housing has an integral connector receptacle (2) at the top with provisions for up to four terminal pins. These terminal pins connect the LRSM to the vehicle electrical system through a dedicated take out and connector of the left body wire harness that extends from above the headliner. Openings on the windshield side of the housing are fitted with four convex clear plastic lenses. A spring steel retaining strap (3) extends forward on each side of the housing to latch the LRSM to a molded black plastic mounting bracket, which is permanently bonded to the inside of the windshield glass. Concealed and protected within the LRSM housing is the electronic circuitry of the module, which includes two Infrared (IR) diodes, two photocells, and a microprocessor. The LRSM is a Local Interface Network (LIN) slave and communicates over a single LIN bus circuit with the Wireless Control Module (WCM). The WCM is a LIN master and a gateway to the Controller Area Network (CAN) data bus. The WCM controls the exchange of electronic messages back and forth between the LRSM and other electronic modules in the vehicle. The LRSM cannot be adjusted or repaired. If ineffective or damaged, the entire module must be replaced. The LRSM mounting bracket is serviced only as a unit with the windshield glass.