Code No. P0703: Malfunction of Stop Lamp Switch
DIAGNOSTIC FUNCTION
JUDGMENT CRITERIA
PROBABLE CAUSES
- Malfunction of the CAN bus
- Malfunction of the stop lamp switch
- Damaged wiring harness and connectors
- Malfunction of CVT-ECU
- Malfunction of ETACS-ECU
DIAGNOSTIC PROCEDURE |
STEP 1. M.U.T.-III CAN bus diagnostics |
| Use M.U.T.-III to perform the CAN bus diagnosis. |
Q.
Is the check result normal?
|
 Go to Step 2. |
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 Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting, Diagnosis Code Chart  ). |
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STEP 2. M.U.T.-III data list |
| Item 50: Brake switch |
| OK: The service data changes in response to the brake operation. |
Q.
Is the check result normal?
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| Intermittent malfunction |
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| Go to Step 3. |
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STEP 3. Check the following connector: |
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| Check the contact status of the terminals. |
Q.
Is the check result normal?
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| Go to Step 4. |
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| Repair the defective connector. |
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STEP 4. Stop Lamp Switch Check |
| Refer to GROUP 35A - Brake Pedal and Stop Lamp Switch Continuity Check (Refer to ). |
Q.
Is the check result normal?
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| Go to Step 5. |
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| Replace the stop lamp switch. |
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STEP 5. Check for open circuit in the wiring harness between the stop lamp switch connector and the ETACS-ECU connector. |
| Between C-126 Stop lamp switch connector (terminal No. 2) and C-304 ETACS-ECU harness-side connector (terminal No. 1) |
Q.
Is the check result normal?
|
| Go to Step 6. |
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| Repair the wiring harness. |
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STEP 6. Check for open circuit or short to earth in wiring harness between the ETACS-ECU connector and the rear combination lamp (LH) connector |
| Between C-304 ETACS-ECU harness-side connector (terminal No. 16) and D-15 rear combination lamp (LH) connector (terminal No. 1) |
Q.
Is the check result normal?
|
| Go to Step 7. |
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| Repair the wiring harness. |
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STEP 7. Check for open circuit in wiring harness between the stop lamp switch connector and the rear combination lamp (LH) |
| Between C-126 stop lamp switch connector (terminal No. 1) and D-15 rear combination lamp (LH) connector (terminal No. 1) |
Q.
Is the check result normal?
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| Go to Step 8. |
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| Repair the wiring harness. |
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STEP 8. Symptom recheck after erasing diagnosis code |
Q.
Is the check result normal?
|
| Intermittent malfunction |
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| Replace the ETACS-ECU, and then go to Step 9. |
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STEP 9. Symptom recheck after erasing diagnosis code |
Q.
Is the check result normal?
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| Intermittent malfunction |
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| Replace CVT-ECU. |
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