Inspection Procedure 8: After the ASC OFF switch is pressed to turn "OFF," the stability control/TCL cannot be cancelled: Diagnosis

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

Required Special Tools:

MB991958 Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827 M.U.T.-III USB Cable
- MB991910 M.U.T.-III Main Harness A

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

Q: Is the check result normal?
1. YES: Go to Step 2.
2. NO: Repair the CAN bus lines. (Refer to TROUBLESHOOTING .) After repairing the CAN bus line, go to Step 8.
STEP 2. ASC OFF switch check
Refer to ASC OFF SWITCH CONTINUITY CHECK .

Q: Is the check result normal?
1. YES: Go to Step 3.
2. NO: Replace the ASC OFF switch. (Refer to ASC OFF SWITCH .) Then, go to Step 8.
STEP 3. Connector check: C-313 ETACS-ECU connector, C-42 intermediate connector, C-135 ASC OFF switch connector
Q: Is the check result normal?
1. YES: Go to Step 4.
2. NO: Repair the defective connector.
STEP 4. Wiring harness check between C-313 ETACS-ECU connector terminal No. 15 and C-135 ASC OFF switch connector terminal No. 1
- Check the power supply circuit for open and short circuit.
  Q: Is the check result normal?
  1. YES: Go to Step 5.
  2. NO: Repair the wiring harness between C-313 ETACS-ECU connector terminal No. 15 and C-135 ASC OFF switch connector terminal No. 1.
STEP 5. Wiring harness check between C-135 ASC OFF switch connector terminal No. 2 and the body ground
- Open circuit check of the ground circuit
  Q: Is the check result normal?
  1. YES: Go to Step 6.
  2. NO: Repair the wiring harness between C-135 ASC OFF switch connector terminal No. 2 and the body ground.
STEP 6. Retest the system.
Q: Does ASC turn ON and OFF normally using the ASC OFF switch?
1. YES: Intermittent malfunction. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)
2. NO: Replace the ETACS-ECU. (Refer to ETACS-ECU .) Then, go to Step 7.
STEP 7. Retest the system.
Q: Does ASC turn ON and OFF normally using the ASC OFF switch?
1. YES: The procedure is complete.
2. NO: Replace the combination meter. (Refer to COMBINATION METER .) Then, go to Step 8.
STEP 8. Retest the system.
Q: Does ASC turn ON and OFF normally using the ASC OFF switch?
1. YES: The procedure is complete.
2. NO: Return to Step 1.