C1613

DTC C1613: AWC Switch System (ON Sticking)

AWC mode select switch system circuit








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 ACD control mode to the combination meter via ETACS-ECU.

DTC SET CONDITIONS
If the AWC switch is on sticking, 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. J/C (3), Intermediate connector, AWC-ECU connector, AWC switch connector check: C-07, C-36, C-51, C-50

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-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?
YES: Go to Step 5.
NO: Repair the wiring harness. Then go to Step 8.

STEP 5. Scan tool data list
Item No.89: AWC switch

Q: Is the check result normal?
YES: Go to Step 7.
NO: Go to Step 6.

STEP 6. AWC switch check.
Check the AWC switch.

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. (Refer to How to Cope with 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.