Dimmer Switch Open Circuit

When Monitored: Ignition in RUN and IOD fuse/connector installed.

Set Condition: Any time the voltage on the Panel Lamps Dimmer Signal circuit exceeds 4.8 volts for 5 seconds.

Possible Causes are:

• PANEL LAMP DIMMER SWITCH
• PANEL LAMPS DIMMER SIGNAL CIRCUIT OPEN
• HEADLAMP SWITCH RETURN OPEN
• BCM

1. Turn ignition off. Disconnect the left multi-function switch connector. Connect a jumper wire between Panel Lamp Dimmer Signal circuit and Headlamp Switch Return. Turn ignition on. Using the DRBIII(R) in Sensors, read the Panel Lamps voltage. Does the DRBIII(R) display Panel Lamp voltage less than 0.5 volts? If yes, replace the left multi-function switch. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS. If no, go to next step.
2. Turn ignition off. Disconnect the left multi-function switch connector. Disconnect the Body Control Module C1 connector. Using an ohmmeter measure the Panel Lamps Dimmer Signal circuit from the BCM C1 connector to the left multi-function switch connector. Is the resistance less than 5 ohms? If yes, go to next step. If no, repair the open Panel Lamps Dimmer Signal circuit. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS.
3. Turn ignition off. Disconnect the Left Multi-function switch connector. Disconnect the Body Control Module C1 connector. Using an ohmmeter measure the Headlamp Switch Return circuit from BCM to Left Multi-function switch. Is the resistance less than 5 ohms? If yes, go to next step. If no, repair the open headlamp switch return circuit. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS.
4. If there are no possible causes remaining, replace the Body Control Module. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS.