Without Steering Audio Remote Switch

DTC C1613: AWC Mode Select Switch System (Clogging) [Vehicles without steering audio remote control switch ]

















CAUTION:

- If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines.
- Whenever the ECU is replaced, ensure that the CAN bus lines are normal.

OPERATION

- AWC-ECU controls the driving mode by the information from AWC switch.
- AWC-ECU sends AWC control mode to the combination meter via ETACS-ECU.

DTC SET CONDITIONS

If the AWC switch is stuck on, the code is set.

PROBABLE CAUSES

- AWC switch malfunction
- Damaged harness wires and connectors
- Malfunction of AWC-ECU

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 3.
NO Repair the CAN bus lines. CAN Bus Diagnostics Chart.) After repairing the CAN bus line, go to Step 2.
STEP 2. Check whether the DTC is reset.

Q. Is DTC No. C1613 set?

YES Go to Step 3.
NO This diagnosis is complete.
STEP 3. AWC-ECU connector, intermediate connector, clock spring connector, AWC switch connector check: C-46, C-31, C-41, C-202, C-205, C-214

Q. Is the check result normal?

YES Go to Step 4.
NO Repair the defective connector. Then go to Step 8.
STEP 4. Wiring harness check between C-46 AWC-ECU connector terminal No. 11 and C-214 AWC switch connector terminal No. 2

Check that the wiring harness is not shorted (short to ground).

Q. Is the check result normal?

YES Go to Step 5.
NO Repair the wiring harness. Then go to Step 8.
STEP 5. Scan tool service data

Item No. 90, 91: AWC switch (Refer to service data reference table Data List Reference Table.)

Q. Is the check result normal?

YES Go to Step 7.
NO Go to Step 6.
STEP 6. AWC switch single unit check

Check the AWC switch.(Refer to Testing and Inspection.)

Q. Is the check result normal?

YES Go to Step 7.
NO Replace the AWC switch.(Refer to Service and Repair.) Then go to Step 8.
STEP 7. Check whether the DTC is reset.

Q. Is DTC No. C1613 set?

YES Replace the AWC-ECU.(Refer to Active Center Differential (ACD).) Then go to Step 8.
NO Intermittent malfunction. How to Cope With Intermittent Malfunctions.)
STEP 8. Check whether the DTC is reset.

Q. Is DTC No. C1613 set?

YES Return to Step 1.
NO This diagnosis is complete.