NO. 6 INSTRUMENT CLUSTER ILLUMINATION DOES NOT ILLUMINATE WHEN TAILLIGHTS ILLUMINATE [INSTRUMENT CLUSTER]


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6

Instrument cluster illumination does not illuminate when taillights illuminate

POSSIBLE CAUSE
•  Instrument cluster malfunction
•  Connector or pin malfunction
•  Fuse malfunction
•  BCM malfunction
•  Short circuit in wiring harness between CAN-L, CAN-H and ground
•  Open circuit in CAN wiring harness (CAN-L, CAN-H)
•  CAN wiring harness (CAN-L, CAN-H) short each other
•  Light switch malfunction
•  Malfunction in vehicle wiring harness between light switch and BCM

Diagnostic procedure

STEP

INSPECTION

ACTION

1
•  Switch the ignition to ON.
•  Turn the light switch to the TNS position.
•  Does the instrument cluster illumination turn on?
Yes
Troubleshooting completed. (The system is normal.)
No
Go to the next step.
2
•  Inspect the ROOM and ILLUMI fuse.
•  Are the fuses normal?
Yes
Go to the next step.
No
Replace the fuse.
•  If the fuse is melted, inspect the wiring harness for short to ground. Repair or replace the wiring harness, then replace the fuse.
3
•  Retrieve DTCs from the instrument cluster and BCM using the M-MDS.
•  Can DTCs be verified?
Yes
Go to the applicable DTC inspection.
No
Go to the next step.
4
•  Monitor the BCM PID TNS_SW using the M-MDS.
•  Does the M-MDS monitored value correspond to the light switch position?
Yes
Replace the instrument cluster.
No
Inspect the following and repair or replace the malfunctioning location.
•  Light switch
•  Vehicle wiring harness between light switch and BCM