Pinpoint Test 4

PINPOINT TEST 4: ONE OR MORE MODULE CONTROLLED ILLUMINATION SOURCE(S) IS INOPERATIVE

Step 1 - 3:

Normal Operation
The instrument panel dimmer switch is an input to the instrument cluster through circuit (T/O). The instrument panel dimmer switch is grounded through circuit (B/W). The instrument cluster monitors the MS CAN bus on circuits (P/O) and (W/O) for a headlamps ON message. The headlamps ON message is generated by the SJB. When the instrument cluster detects a headlamps ON message, it sends a variable voltage to the module-controlled illumination sources through circuit (LB/R). The module-controlled and non-dimmable illumination sources are grounded through circuit (B). The non-dimmable illumination sources receive a battery signal through circuit (R/B) when the ignition switch is turned to the ON position.

Possible Causes
- circuit (LB/R) open
- circuit (B) open
- rear window defrost switch
- hazard flasher switch
- transaxle range selector
- fog lamp switch.