Diagnostic Procedure

WARNING: This page is about a different variant/trim than selected.

STEP 1. Scan tool CAN bus diagnostics
Using scan tool MB991958, diagnose the CAN bus lines.

Q: Is the check result normal?
1. YES: Go to Step 3.
2. NO: Repair the CAN bus lines (Refer to TROUBLESHOOTING ). After repairing the CAN bus line, go to Step 2.
STEP 2. Check whether the DTC is reset.
Q: Is DTC No. C1613 set?
1. YES: Go to Step 3.
2. NO: This diagnosis is complete.
STEP 3. Intermediate connector, AWC-ECU connector, AWC switch connector check: C-36, C-51, C-50
Q: Is the check result normal?
1. YES: Go to Step 4.
2. NO: Repair the defective connector. Then go to Step 8.
STEP 4. Wiring harness check between C-51 AWC-ECU connector terminal No. 21 and C-50 AWC switch connector terminal No. 1.
Check the output line for short (for short to the power supply) circuit.

Q: Is the check result normal?
1. YES: Go to Step 5.
2. NO: Repair the wiring harness. Then go to Step 8.
STEP 5. Scan tool data list
Item No. 89: AWC switch (Refer to DATA LIST REFERENCE TABLE ).

Q: Is the check result normal?
1. YES: Go to Step 7.
2. NO: Go to Step 6.
STEP 6. AWC switch check.
Check the AWC switch (Refer to AWC SWITCH CHECK ).

Q: Is the check result normal?
1. YES: Go to Step 7.
2. NO: Replace the AWC switch (Refer to AWC-ECU ). Then go to Step 8.
STEP 7. Check whether the DTC is reset.
Q: Is DTC No. C1613 set?
1. YES: Replace the AWC-ECU (Refer to AWC-ECU ). Then go to Step 8.
2. NO: Intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
STEP 8. Check whether the DTC is reset.
Q: Is DTC No. C1613 set?
1. YES: Return to Step 1.
2. NO: This diagnosis is complete.