Detailed Flow

INTERVIEW THE CUSTOMER
It is also important to clarify customer complaints before inspection. First of all, reproduce symptoms, and understand them fully. Ask the customer about his/her complaints carefully. In some cases, it is necessary to check symptoms by driving the customer with the customer.

CAUTION: Customers are not professional. It is dangerous to make an easy guess like "maybe the customer means that...," or "maybe the customer mentions this symptom".

: GO TO 2.
CHECK SYMPTOM
Reproduce symptoms indicated by the customer, based on information obtained from the interview with the customer. In addition, check if the symptoms are caused by the Fail-safe function and the protective function.

Refer to "FAIL-SAFE ".

CAUTION: If the symptoms are normal operation, check each part thoroughly and gain the understanding from the customer, explaining that the symptoms are not malfunction.

: GO TO 3.
CHECK CURRENT STATE
Start the engine.

CAUTION: Stop the vehicle.

Does RAS warning lamp turn ON?

YES: GO TO 4.

NO: GO TO 8.
PERFORM SELF-DIAGNOSIS
With CONSULT

Perform self-diagnosis.

Is any DTC detected?

YES: Record or print DTC and freeze frame data (FFD). GO TO 5.

NO: GO TO 8.
RECHECK SYMPTOM
With CONSULT
1. Turn the ignition switch OFF and wait for 10 seconds or more.
2. Record the values of "DATA MONITOR" for each DTC detected by self-diagnosis.
3. Record the values of "FREEZE FRAME DATA" for each DTC detected by self-diagnosis.
4. Erase the memory of self-diagnosis results (history) of "4WAS (MAIN)/RAS/HICAS".
  CAUTION:
  - When replacing the RAS control unit according to the self-diagnosis, replace it without erasing self-diagnosis results (history).
  - When erasing the memory of the self-diagnosis results (history), print or record all the values of "DATA MONITOR" for each DTC with CONSULT to erase the memory of the self-diagnosis result (history).
5. Perform "DTC CONFIRMATION PROCEDURE" for each malfunction.
  NOTE:
  - When multiple DTCs are detected, refer to "DTC INSPECTION PRIORITY CHART " to determine the sequence of performing a self-diagnosis.
  - When DTC is not detected, refer to Freeze frame data.
  Is any DTC detected?
  
  YES: GO TO 6.
  
  NO: Check harness and connector, based on information obtained from the interview with the customer. Refer to "INTERMITTENT INCIDENT ".
REPAIR AND REPLACE PART
1. Repair or replace malfunctioning part.
  CAUTION: Securely connect the removed parts and connectors.
2. Erase the memory of self-diagnosis results (history) of "4WAS (MAIN)/RAS/HICAS".
  : GO TO 7.
RECHECK SYMPTOM
With CONSULT

Perform "DTC CONFIRMATION PROCEDURE" for each malfunction.
NOTE:
- When multiple DTCs are detected, refer to "DTC INSPECTION PRIORITY CHART " to determine the sequence of performing a self-diagnosis.
- When DTC is not detected, refer to Freeze frame data.
Is any DTC detected?

YES: GO TO 6.

NO: GO TO 9.
DIAGNOSIS BY SYMPTOM
Estimate and check malfunctioning parts, based on the symptoms obtained from the diagnosis by symptom.

Is a malfunctioning part identified?

YES: GO TO 9.

NO: Check harness and connector, based on information obtained from the interview with the customer. Refer to "INTERMITTENT INCIDENT ".
FINAL CHECK
With CONSULT
1. Check the input-output reference values of RAS control unit.
2. Recheck the symptom under the same conditions as those for the successfully reproduced malfunction symptom.
  Is a malfunction symptom reproduced?
  
  OK: GO TO 4.
  
  NO: INSPECTION END