INSPECTION PROCEDURE 2: After starting the engine, the brake warning lamp remains ON.
| caution | First of all, check the parking brake switch circuit and the brake fluid level switch circuit. |
| note | This diagnosis procedure is limited to cases where communication with the M.U.T.-III is possible (ASTC-ECU power supply is normal) and no Diagnosis code sets. |
OPERATION
COMMENT ON TROUBLE SYMPTOM
PROBABLE CAUSES
- Damaged wiring harness or connector
- Malfunction of the ASTC-ECU
- Malfunction of the combination meter
DIAGNOSIS |
STEP 1. Check combination meter connector D-02 and ASTC-ECU connector D-223 for loose, corroded or damaged terminals, or terminals pushed back in the connector. |
Q.
Is the check result normal?
|
 Go to Step 2. |
|
 Repair the faulty connector or terminal. Then go to Step 5. |
|
STEP 2. Check the brake warning light drive circuit at ASTC-ECU harness connector D-223. |
| (1)Disconnect ASTC-ECU connector D-223 and check at the harness connector (component side). |
| (2)Turn the ignition switch to the "ON" position. |
| (3)Connect terminal 81 to body earth. |
Q.
Does the brake warning light turn off?
|
Replace the ASTC-ECU (Refer to GROUP 35C, ASTC-ECU  ). Then go to Step 5. |
|
| Go to Step 3. |
|
STEP 3. Check intermediate connector D-230 for loose, corroded or damaged terminals, or terminals pushed back in the connector. |
Q.
Is the check result normal?
|
| Go to Step 4. |
|
| Repair or replace it. Then go to Step 5. |
|
STEP 4. Check the harness wires between combination meter connector D-02 (terminal 45) and ASTC-ECU connector D-223 (terminal 81). |
Q.
Is the check result normal?
|
| Replace the combination meter (Refer to GROUP 54A, Combination Meter Assembly ). Then go to Step 5. |
|
| Repair or replace it. Then go to Step 5. |
|
STEP 5. Retest the system. |
Q.
Does the brake warning light turn on for three seconds and then turn off on start-up?
|
| The procedure is complete. |
|
| Start over at Step 1. |
|