C1615

DTC C1615: Brake control prohibition request

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 receives brake control signal from ASC-ECU via the CAN communication.

DTC SET CONDITIONS

The code is set when brake control prohibition request is received from ASC-ECU.

PROBABLE CAUSES

- Malfunction of ASC-ECU
- 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. C1615 set?

YES Go to Step 3.
NO This diagnosis is complete.
STEP 3. Scan tool diagnostic trouble code

Check if the ASC diagnostic trouble code No. U0251, U0435, or U0440 is set. Active Stability Control System (ASC).)

Q. Is the DTC set?

YES Perform the relevant troubleshooting.
NO Go to Step 4.
STEP 4. Scan tool diagnostic trouble code

Check other AWC diagnostic trouble code.(Refer to Super All Wheel Control (S-AWC).)

Q. Is the DTC set?

YES Perform the relevant troubleshooting.
NO Go to Step 5.
STEP 5. Check whether the DTC is reset.

Q. Is DTC No. C1615 set?

YES Replace the AWC-ECU.(Refer to Active Center Differential (ACD).)
NO Intermittent malfunction. How to Cope With Intermittent Malfunctions.)