Diagnostic Procedure
- STEP 1. Scan tool CAN bus diagnostics
Using scan tool MB991958, diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines. (Refer to TROUBLESHOOTING ). After repairing the CAN bus line, go to Step 2.
- STEP 2. Scan tool actuator test
Item No.2: Back-up light (Refer to SPECIAL FUNCTION (ACTUATOR TEST REFERENCE TABLE) .
Q: Is the check result normal?
YES : Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
NO : Go to Step 3.
- STEP 3. Scan tool diagnostic trouble code
Check the ETACS diagnostic trouble code. (Refer to TROUBLESHOOTING ).
Q: Is the DTC set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 4.
- STEP 4. Bulb check
Check if the bulb of the back-up light which does not illuminate is normal.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Replace the bulb which does not illuminate.
- STEP 5. Measure the resistance at F-08 back-up light (RH) connector and F-22 back-up light (LH) connector.
Disconnect the connector of the light which does not illuminate, and measure the resistance between the connector terminal No. 2 and ground at the wiring harness side.
OK: Continuity exists (2 Ω or less)
Q: Is the check result normal?
YES : Go to Step 8.
NO : Go to Step 6.
- STEP 6. Inspection of the back-up light (RH) connector, back-up light (LH) connector, and intermediate connector: F-08, F-22, F-27
Check for the contact with the connector terminals of the light which does not illuminate.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Repair the defective connector.
- STEP 7. Check the wiring harness between F-08 back-up light (RH) connector terminal No. 2 and body ground, and between F-22 back-up light (RH) connector terminal No. 2 and body ground.
Check the ground harness of the light which does not illuminate for open circuit.
Q: Is the check result normal?
YES : Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
NO : Repair the wiring harness.
- STEP 8. Measure the voltage at F-08 back-up light (RH) connector and F-22 back-up light (LH) connector.
- Disconnect the connector of the light which does not illuminate, and measure the voltage between the connector terminal No. 3 and ground at the wiring harness side.
- Turn the ignition switch to the "ON" position.
- Place the shift lever to the R range.
OK: Battery positive voltage
Q: Is the check result normal?
YES : Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
NO : Go to Step 9.
- STEP 9. Inspection of J/C (4), intermediate connector, shift lever assembly connector, ETACS-ECU connector, and back-up light connector: C-43, C-47, C-27, C-304, C-311, C-313, D-17, F-08, F-22, F-27
Check for the contact with the connector terminals of the light which does not illuminate.
Q: Is the check result normal?
YES : Go to Step 10.
NO : Repair the defective connector.
- STEP 10. Check the wiring harness between F-08 back-up light (RH) connector terminal No. 3 and C-313 ETACS-ECU connector terminal No. 4, and between F-22 back-up light (RH) connector terminal No. 3 and C-313 ETACS-ECU connector terminal No. 4.
Check the power supply line of the light which does not illuminate for open or short circuit.
Q: Is the check result normal?
YES : Go to Step 11.
NO : Repair the wiring harness.
- STEP 11. Retest the system.
Q: Does a malfunction take place again?
YES : Replace the shift lever assembly. (Refer to TRANSMISSION CONTROL ).
NO : Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).