Inspection Procedure
6: 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
The rear display unit may be defective
The combination meter may be defective
Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III other system diagnosis code.
Check if the diagnosis code is set in the combination meter.
Q.
Is the check result normal?
Troubleshoot the combination meter (Refer to ).
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.