Inspection Procedure 4: The rear display unit does not change to nighttime brightness when the headlamp is illuminated.


caution Whenever the rear display unit is replaced, ensure that the communication circuit is normal.

COMMENTS ON TROUBLE SYMPTOM


The wiring harness between the combination meter and the rear display unit, the combination meter or the rear display unit may have a problem.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III other system diagnosis code
Check if the diagnosis code is set to the combination meter.

Q. Is the check result normal?
Troubleshoot the combination meter.
Go to Step 2.

STEP 2. Check of short to power supply, short to earth, and open circuit in ILL line between rear display unit connector and combination meter connector

Q. Is the check result normal?
Go to Step 3.
Repair the connector(s) or wiring harness.

STEP 3. Substitute a known good rear display unit, and check the trouble symptom.
Check whether rear display unit does change to nighttime brightness when the headlamps are illuminated.

Q. Is the check result normal?
Replace the rear display unit.
Replace the combination meter.