Inspection Procedure 3

INSPECTION PROCEDURE 3: The ACD Mode Indicator Light Does Not Light Up When The Ignition Switch Is Turned ON (Engine Is Stopped).

ACD Mode Indicator Lamp System Circuit:

CIRCUIT OPERATION
^ The AWD-ECU displays a control mode (tarmac, gravel, snow) on the ACD mode indicator light on the combination meter.

COMMENT
^ The ACD mode indicator light circuit or AWD-ECU may be faulty.

TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THIS CONDITION:)
^ Damaged harness and connector
^ Malfunction of the ACD mode indicator light assembly
^ Malfunction of the AWD-ECU

DIAGNOSIS
STEP 1. Measure the power supply voltage at combination meter connector C-01.








1) Disconnect the combination meter connector C-01 and measure at the harness side.
2) Turn the ignition switch to the ON position.
3) Measure the voltage between terminal 9 and ground.
^ The voltage should measure battery positive voltage.

4) Turn the ignition switch to the LOCK (OFF) position.
Q: Is the measured voltage battery positive voltage?
YES: Go to Step 4.
NO: Go to Step 2.

STEP 2. Check combination meter connector C-01, joint connector (4) C-23, junction block connector C-211 and C-214 for loose, corroded or damaged terminals, or terminals pushed back in the connector.











Q: Are the connectors and terminals in good condition?
YES: Go to Step 3.
NO: Repair or replace the damaged components.

STEP 3. Check harness for open circuit or short circuit between combination meter connector C-01 terminal 9 and ignition switch.





Q: Is the harness wire in good condition?
YES: It can be assumed that this malfunction is intermittent.
NO: Repair or replace the harness wire.

STEP 4. Check the ACD mode indicator light illumination.





1) Disconnect the AWD-ECU connector C-138 and check the harness side.
2) Turn the ignition switch to the ON position.




3) Connect terminals 40, 51, 52 to ground.
^ The ACD mode indicator light illuminates.

4) Turn the ignition switch to the LOCK (OFF) position.
Q: Is the ACD mode indicator light illuminate properly?
YES: Go to Step 7.
NO: Go to Step 5.

STEP 5. Check combination meter connector C-01, intermediate connector C-137 and AWD-ECU connector C-138 for loose, corroded or damaged terminals, or terminals pushed back in the connector.











Q: Are the connectors and terminals in good condition?
YES: Go to Step 6.
NO: Repair or replace the damaged components.

STEP 6. Check the harness for open circuit or short circuit between combination meter connector C-01 (terminals 10, 14, 15) and AWD-ECU connector C-138 (terminals 40, 52, 51).








Q: Is the harness wire in good condition?
YES: Replace the ACD mode indicator light assembly.
NO: Repair or replace the harness wire.

STEP 7. Check AWD-ECU connector C-138 for loose, corroded or damaged terminals, or terminals pushed back in the connector.





Q: Are the connector and terminals in good condition?
YES: Replace the AWD-ECU
NO: Repair or replace the damaged components.