Wireless Control Module (WCM)
DTC C1915: Transmitter OFF Mode 1DTC C1925: Transmitter OFF Mode 2
DTC C1935: Transmitter OFF Mode 3
DTC C1945: Transmitter OFF Mode 4
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 (Refer to Controller area network Trouble code diagnosis).
DTC SET CONDITION
WCM receives the wheel speed information from ABS-ECU via the CAN-bus line. Although WCM receives the information that the wheel is not currently rotated from ABS-ECU, if the TPMS transmitter sends the information that the wheel is rotated, this code is set.
TROUBLESHOOTING HINTS
The most likely causes for this DTC to set are:
- OFF mode cancellation not performed
- Damaged wiring harness and connector
- Malfunction of TPMS transmitter
- Malfunction of WCM
- Malfunction of ABS-ECU
- Malfunction of ETACS-ECU
DIAGNOSIS
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. M.U.T.-III CAN bus diagnostics
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to Controller area network CAN Bus Diagnostics table). On completion, go to Step 2.
STEP 2. Diagnostic trouble code recheck after resetting CAN bus lines
1. Start the engine and drive the vehicle at 5 km/h (3 mph) or more.
2. Turn the ignition switch to the "LOCK" (OFF) position.
3. Turn the ignition switch to the "ON" position.
4. Check if the DTC is set.
5. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC C1915, C1925, C1935 or C1945 set?
YES : Go to Step 3
NO : The procedure is complete.
STEP 3. Diagnostic trouble code check
1. Start the engine and drive the vehicle at 5 km/h (3 mph) or more.
2. Turn the ignition switch to the "LOCK" (OFF) position.
3. Turn the ignition switch to the "ON" position.
4. Check if the DTC is set.
5. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC C1915, C1925, C1935 and C1945 set?
YES : Replace the TPMS transmitters of all the four wheels, and register ID codes. Then go to Step 5.
NO : Go to Step 4.
STEP 4. Check for TPMS transmitter.
TPMS transmitter check.
NOTE: The TPMS transmitter which cannot be checked may be faulty or the ID code may not be registered, thus do not replace it, but register the ID code. If the transmitter is faulty, it is replaced in the ID code registration process.
Q: Is the check result normal?
YES : Among the checked TPMS transmitters, replace the TPMS transmitters to which the DTC is set, and then register the ID codes.Then go to Step 5.
NO : Even when no transmitter is checked, register the ID codes. Then go to Step 5.
STEP 5. Diagnostic trouble code recheck after register the ID codes
1. Turn the ignition switch to the "ON" position.
2. Check if the DTC is set.
3. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC C1915, C1925, C1935 or C1945 set?
YES : Replace the WCM and register the ID codes.Then start over at Step 1.
NO : The procedure is complete.