Vehicles Without Steering Audio Remote Control 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. 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, C41, 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 (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.(Service and Repair)
Q: Is the check result normal?
YES: Go to Step 7.
NO: Replace the AWC switch. Then go to Step 8.

STEP 7. Check whether the DTC is reset.
Q: Is DTC No. C1613 set?
YES: Replace the AWC-ECU. Then go to Step 8.
NO: Intermittent malfunction.

STEP 8. Check whether the DTC is reset.
Q: Is DTC No. C1613 set?
YES: Return to Step 1.
NO: This diagnosis is complete.