4WAS Warning Lamp

4WAS WARNING LAMP





Description
- Turn 4WAS warning lamp ON when ignition switch turns ON from OFF. Then, turn 4WAS warning lamp OFF after the engine is started.
- The check of 4WAS system is performed.
- 4WAS system stops (error) when turning 4WAS warning lamp ON.




Diagnosis Procedure
1.PERFORM UNIFIED METER AND A/C AMP. SELF-DIAGNOSIS
With CONSULT-III
Perform the self-diagnosis of the unified meter and A/C amp.
Is any error system detected?
YES - Check the error system.
NO - GO TO 2.
2.PERFORM SELF-DIAGNOSIS (4WAS MAIN CONTROL UNIT)
With CONSULT-III
Perform 4WAS main control unit self-diagnosis.
Is DTC "U1000" or "U1010" detected?
YES - Check the error system.
NO - GO TO 3.
3.PERFORM COMBINATION METER CIRCUIT
1. Turn the ignition switch OFF.
2. Disconnect the unified meter and A/C amp. harness connector.
3. Disconnect the combination meter harness connector.
4. Check the continuity between the unified meter and A/C amp. harness connector and the combination meter harness connector terminal.





Is the inspection result normal?
YES - GO TO 4.
NO - Repair or replace the harnesses and connectors.
4.CHECK 4WAS WARNING LAMP SIGNAL
With CONSULT-III
1. Connect the unified meter and A/C amp. harness connector.
2. Connect the combination meter harness connector.
3. Disconnect 4WAS front control unit harness connector.
4. Turn the ignition switch ON.

CAUTION:
Never start the engine.
5. Check "WARNING LAMP" item on DATA MONITOR of 4WAS main control unit.
Does the item on "DATA MONITOR" indicate "On"?
YES - GO TO 5.
NO - Replace 4WAS main control unit. Exploded View.
5.CHECK COMBINATION METER
With CONSULT-III
Perform the trouble diagnosis of the combination meter. Combination Meter.
Is the inspection result normal?
YES - INSPECTION END
NO - Replace the combination meter. Exploded View.




Special Repair Requirement

BEFORE REPLACING 4WAS MAIN CONTROL UNIT
- Record the self-diagnosis results (history).

CAUTION:
- Never erase the memory (history) of self-diagnosis results when replacing 4WAS main control unit after diagnosis.
- Erase the memory of the self-diagnosis results (record) after printing out or recording all the values of "DATA MONITOR".