C1909

C1909 RAS CONTROL UNIT





Description
- RAS actuator and the power steering solenoid valve is controlled by each sensor signal.
- The fail-safe function stops the rear wheel angle function, when the electric components and the mechanical components are malfunctioning.
- The protective function stops RAS system temporarily when the input signal is not inputted to RAS control unit (When battery-power does not work temporarily).




DTC Logic

DTC DETECTION LOGIC






DTC CONFIRMATION PROCEDURE
1.DTC REPRODUCTION PROCEDURE
With CONSULT-III
1. Turn the ignition switch from OFF to ON.
2. Perform "4WAS(MAIN)/RAS/HICAS" self-diagnosis.
Without CONSULT-III
1. Start the engine.
2. Perform the self-diagnosis. Diagnosis Description.
Is DTC "C1909" or "RAS warning lamp flickering pattern:11" detected?
YES - Proceed to diagnosis procedure. C1909.
NO - INSPECTION END




Diagnosis Procedure
1.CHECK RAS CONTROL UNIT POWER SUPPLY
1. Turn the ignition switch OFF.
2. Disconnect RAS control unit harness connector.
3. Check the voltage between RAS control unit harness connector terminal and ground.





4. Turn the ignition switch ON.

CAUTION:
Never start the engine.
5. Check the voltage between RAS control unit harness connector terminal and ground.





Is the inspection result normal?
YES - GO TO 2.
NG - Check the following items. Repair or replace the malfunctioning parts.
- 10A fuse (#45) open
- Short among 10A fuse (#45) connector, RAS control unit harness connector No. 27 terminal and the ground
- Open between the ignition switch and RAS control unit harness connector No. 27 terminal
- Ignition switch
2.CHECK RAS CONTROL UNIT GROUND
Check the continuity between RAS control unit harness connector and ground.





Is the inspection result normal?
YES - GO TO 3.
NG - Repair or replace the harnesses and connectors.
3.PERFORM SELF-DIAGNOSIS
With CONSULT-III
1. Connect RAS control unit harness connector.
2. Turn the ignition switch from OFF to ON.
3. Perform "4WAS(MAIN)/RAS/HICAS" self-diagnosis.
Without CONSULT-III
1. Connect RAS control unit harness connector.
2. Start the engine.
3. Perform the self-diagnosis. Diagnosis Description.
Is DTC "C1909" or "RAS warning lamp flickering pattern:11" detected?
YES - Replace RAS control unit. RAS Control Unit.
NO - GO TO 4.
4.CHECK INFORMATION
With CONSULT-III
1. Select "DATA MONITOR" of "4WAS(MAIN)/RAS/HICAS".
2. Check the "DATA MONITOR" value of each DTC detected with the self-diagnosis function. With Rear Active Steer.
Is each data the standard value?
YES - Check each harness connector pin terminal for disconnection.
NO - Replace RAS control unit. RAS Control Unit.




Special Repair Requirement

BEFORE REPLACING RAS CONTROL UNIT
- Record the self-diagnosis results (history).

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