Inspection Procedure 41: Stop Lamp Switch System
COMMENTS ON TROUBLE SYMPTOM
PROBABLE CAUSES
- Malfunction of brake pedal
- Malfunction of stop lamp switch system
- Damaged harness wires and connectors
- Malfunction of the A/T-ECU
DIAGNOSIS PROCEDURE |
STEP 1. Check of the stop lamp on and off |
| The stop lamps should illuminate when the brake pedal is depressed, and extinguish when
released. |
Q.
Is the check result normal?
|
 Go to Step 14. |
|
 Go to Step 2. |
|
STEP 2. Brake pedal height check |
Refer to GROUP 35A - On-vehicle Service  . |
Q.
Is the check result normal?
|
| Go to Step 3. |
|
| Adjust the brake pedal height. |
|
STEP 3. Stop Lamp Switch Check |
| Refer to GROUP 35A - Brake Pedal . |
Q.
Is the check result normal?
|
| Go to Step 4. |
|
| Replace the stop lamp switch. |
|
STEP 4. Stop lamp bulb check |
| Check the stop lamp bulb for any abnormality. |
Q.
Is the check result normal?
|
| Go to Step 5. |
|
| Replace the stop lamp bulb. |
|
STEP 5. Stop lamp switch connector check: D-134 |
| Check the contacting status of terminals. |
Q.
Is the check result normal?
|
| Go to Step 6. |
|
| Repair the damaged connector. |
|
STEP 6. Voltage measurement at D-134 stop lamp switch connector |
| Disconnect the connector, and measure the voltage between terminal No.2 and earth at the
harness side. |
| OK: Battery voltage |
Q.
Is the check result normal?
|
| Go to Step 9. |
|
| Go to Step 7. |
|
STEP 7. Intermediate connector check: D-241 |
| Check the contacting status of terminals. |
Q.
Is the check result normal?
|
| Go to Step 8. |
|
| Repair the damaged connector. |
|
STEP 8. Wiring harness check between D-134 stop lamp switch connector terminal No.2 and battery |
| Check the power supply line for open circuit. |
Q.
Is the check result normal?
|
| Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent
Malfunction ). |
|
| Repair the wiring harness. |
|
STEP 9. Intermediate connector, rear combination lamp connector check: D-222 <LHD>, D-220 <RHD>, D-236, E-06, E-12 |
| Check the contacting status of terminals. |
Q.
Is the check result normal?
|
| Go to Step 10. |
|
| Repair the damaged connector. |
|
STEP 10. Wiring harness check between D-134 stop lamp switch connector terminal No.1 and E-06 rear combination lamp (RH) connector terminal No.2 as well as E-12 rear combination lamp (LH) connector terminal No.2 |
| Check the output line for short or open circuit. |
Q.
Is the check result normal?
|
| Go to Step 11. |
|
| Repair the wiring harness. |
|
STEP 11. Wiring harness check between E-06 rear combination lamp (RH) connector terminal No.4 <short wheelbase> or terminal No.5 <long wheelbase> and body earth, as well as between E-12 rear combination lamp (LH) connector terminal No.4 <short wheelbase> or terminal No.5 <long wheelbase> and body earth |
| Check the earth line for open circuit. |
Q.
Is the check result normal?
|
| Go to Step 12. |
|
| Repair the wiring harness. |
|
STEP 12. J/C (6), intermediate connector, A/T-ECU connector check: D-113, D-230, D-139 |
| Check the contacting status of terminals. |
Q.
Is the check result normal?
|
| Go to Step 13. |
|
| Repair the damaged connector. |
|
STEP 13. Wiring harness check between D-134 stop lamp switch connector terminal No.1 and D-139 A/T-ECU connector terminal No.52 |
| Check the output line for short circuit. |
Q.
Is the check result normal?
|
| Go to Step 18. |
|
| Repair the wiring harness. |
|
STEP 14. Voltage measurement at D-139 A/T-ECU connector |
| Measure the voltage between D-139 A/T-ECU connector terminal No.52 and earth
at the ECU side. |
OK:
Release the brake pedal: 1 V or less |
Q.
Is the check result normal?
|
| Go to Step 17. |
|
| Go to Step 15. |
|
STEP 15. Stop lamp switch connector, J/C (6), intermediate connector, A/T-ECU connector check: D-134, D-113, D-230, D-139 |
| Check the contacting status of terminals. |
Q.
Is the check result normal?
|
| Go to Step 16. |
|
| Repair the damaged connector. |
|
STEP 16. Wiring harness check between D-134 stop lamp switch connector terminal No.1 and D-139 A/T-ECU connector terminal No.52 |
| Check the output line for open circuit. |
Q.
Is the check result normal?
|
| Go to Step 18. |
|
| Repair the wiring harness. |
|
STEP 17. A/T-ECU connector check: D-139 |
| Check the contacting status of terminals. |
Q.
Is the check result normal?
|
| Go to Step 18. |
|
| Repair the damaged connector. |
|
STEP 18. M.U.T.-III data list |
| Item 19: Stop lamp switch (Refer to Service Data Reference Table .) |
Q.
Is the check result normal?
|
| Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent
Malfunction ). |
|
| Replace the A/T-ECU. |
|