C1912

C1911, C1912 4WAS REAR MOTOR POWER SUPPLY





Description
The power supply for 4WAS rear motor.




DTC Logic

DTC DETECTION LOGIC






DTC CONFIRMATION PROCEDURE
1.RECHECK DTC
1. Turn the ignition switch from OFF to ON.

CAUTION:
Never drive the vehicle. Wait 15 minutes or more.
2. Perform self-diagnosis for "4WAS(MAIN)/RAS/HICAS".
Is DTC "C1911" or "C1912" detected?
YES - Proceed to diagnosis procedure. SEE Diagnosis Procedure.
NO - INSPECTION END




Diagnosis Procedure
1.CHECK 4WAS MAIN CONTROL UNIT GROUND
1. Turn the ignition switch OFF.
2. Disconnect 4WAS main control unit harness connector.
3. Check the continuity between 4WAS main control unit harness connector terminal and the ground.





Is the inspection result normal?
YES - GO TO 2.
NO - Repair or replace the harnesses and connectors.
2.CHECK 4WAS MAIN CONTROL UNIT POWER SUPPLY (1)
1. Check the voltage between 4WAS main control unit harness connector terminal and ground.





2. Turn the ignition switch ON.

CAUTION:
Never start the engine.
3. Check the voltage between 4WAS main control unit harness connector terminal and ground.





Is the inspection result normal?
YES - GO TO 4.
NO - GO TO 3.
3.CHECK 4WAS MAIN CONTROL UNIT POWER SUPPLY (2)
1. Turn the ignition switch OFF.
2. Check the 10A fuse (#46).
3. Disconnect IPDM E/R harness connector.
4. Check the continuity between 4WAS main control unit harness connector and IPDM E/R harness connector.





5. Check the continuity between 4WAS main control unit harness connector and ground.





Is the inspection result normal?
YES - Perform the trouble diagnosis for ignition power supply circuit. Ignition Power Supply, "Wiring Diagram -
IGNITION POWER SUPPLY -".
NO - Repair or replace error-detected parts.
4.CHECK 4WAS REAR MOTOR POWER SUPPLY CIRCUIT (1)
1. Remove 4WAS rear motor relay.
2. Check the continuity between 4WAS rear motor relay harness connector and ground.





3. Check the continuity between 4WAS main control unit harness connector and IPDM E/R harness connector.





Is the inspection result normal?
YES - GO TO 5.
NO - Repair or replace error-detected parts.
5.CHECK 4WAS REAR MOTOR POWER SUPPLY CIRCUIT (2)
1. Check 20A fusible link (#37).
2. Check the harness for open or short between 4WAS front control unit harness connector No.3 terminal and 20A fusible link (#37).
Is the inspection result normal?
YES - GO TO 6.
NO - Repair or replace error-detected parts.
6.CHECK 4WAS REAR MOTOR POWER SUPPLY CIRCUIT (3)
1. Turn the ignition switch ON.
CAUTION:
Never start the engine.
2. Check the voltage between 4WAS main control unit harness connectors and the ground.





3. Turn the ignition switch OFF.
Is the inspection result normal?
YES - GO TO 7.
NO - Replace 4WAS main control unit. 4WAS Main Control Unit.
- Before replacing 4WAS main control unit, record the self-diagnosis results(history). STC-
141, "Special Repair Requirement".
7.CHECK 4WAS REAR MOTOR RELAY
Check 4WAS rear motor relay. SEE Component Inspection.
Is the inspection result normal?
YES - GO TO 8.
NO - Replace 4WAS rear motor relay.
8.CHECK 4WAS REAR MOTOR POWER SUPPLY
1. Connect 4WAS main control unit harness connector.
2. Install 4WAS rear motor relay.
3. Turn the ignition switch ON.
CAUTION:
Never start the engine.
4. Check the voltage between 4WAS main control unit harness connectors and the ground.





Is the inspection result normal?
YES - GO TO 9.
NO - Replace 4WAS main control unit. 4WAS Main Control Unit.
- Before replacing 4WAS main control unit, record the self-diagnosis results(history). STC-
141, "Special Repair Requirement".
9.PERFORM SELF-DIAGNOSIS (4WAS MAIN CONTROL UNIT)
With CONSULT-III
Perform self-diagnosis for "4WAS(MAIN)/RAS/HICAS".
Is DTC "C1911" or "C1912" detected?
YES - Replace 4WAS main control unit. 4WAS Main Control Unit.
- Before replacing 4WAS main control unit, record the self-diagnosis results(history). STC-
141, "Special Repair Requirement".
NO - GO TO 10.
10.CHECK INFORMATION
With CONSULT-III
Check the "DATA MONITOR" value of each DTC detected with the self-diagnosis function. 4WAS Main Control Unit, "Reference Value".
Is each data the standard value?
YES - Check each harness connector pin terminal for disconnection.
NO - Replace 4WAS main control unit. 4WAS Main Control Unit.
- Before replacing 4WAS main control unit, record the self-diagnosis results(history). SEE Special Repair Requirement.




Component Inspection
1.CHECK 4WAS REAR MOTOR RELAY
1. Turn the ignition switch OFF.
2. Remove 4WAS rear motor relay connector.
3. Apply 12 V to 4WAS rear motor relay connector No. 1 terminal and No. 2 terminal.

CAUTION:
- Never make the terminals short.
- Connect the fuse between the terminals when applying the voltage.
4. Check the continuity between 4WAS rear motor relay connector terminals.





5. Check the resistance between 4WAS rear motor relay connector terminals.





Is the inspection result normal?
YES - INSPECTION END
NO - Replace 4WAS rear motor relay.




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".