Lights On Indicator Malfunction

/ 9-5 (9650) / 2011 / 3. Electrical System / Lighting and signalling systems / Fault diagnosis, fault symptoms / Lights On Indicator Malfunction

Diagnostic Instructions

•	Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

•	Review Strategy Based Diagnosis for an overview of the diagnostic approach.

•	Diagnostic Procedure Instructions has overviews of all diagnostic categories.

Circuit/System Description

With the headlight switch in the HEADLAMP or PARKLAMP position, the appropriate headlamp switch signal circuit is grounded through the headlight switch. The body control module (BCM) then sends a serial data message to the instrument cluster requesting the instrument cluster to illuminate the lights on indicator. With the turn signal/multifunction switch in the HIGH BEAM or FLASH TO PASS position the appropriate turn signal/multifunction switch signal circuit is grounded through the turn signal/multifunction switch. The BCM then sends a serial data message to the instrument cluster requesting the instrument cluster to illuminate the high beam indicator. The BCM will also request the instrument cluster to turn on the lights on indicator located in the driver information center anytime the headlamps are ON and the ignition is OFF or the driver door is opened.

Diagnostic Aids

This diagnostic procedure assumes that the headlamps operate as described in Exterior Lighting Systems Description and Operation .

Reference Information

Schematic Reference

•	Instrument Cluster Schematics

•	Exterior Lights Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Exterior Lighting Systems Description and Operation

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

Scan Tool Reference

Control Module References for information on diagnostic tools

Circuit/System Testing

Lights On Indicator Malfunction

Ignition ON, command the All Indicators test ON and OFF with the scan tool, verify that the lights on indicator changes between turn ON and OFF.

High Beam Indicator Malfunction

Ignition ON, command the All Indicators test ON and OFF with the scan tool, verify that the high beam indicator changes between turn ON and OFF.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for BCM or instrument cluster replacement, setup, and programming

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