Wireless Control Module

DTC C1900: No Registration

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.

TPMS DTC SET CONDITION
When the ID registration information for the TPMS transmitter is not stored in WCM, this code is set. Also when the forced termination is made while one or more wheels are registered with the ID registration mode, the ID information inside WCM is erased, and this code is set.

TROUBLESHOOTING HINTS
The most likely causes for this DTC to set are:
- Damaged wiring harness and connector.
- Malfunction of TPMS transmitter.
- Malfunction of WCM.

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 MB991958, diagnose the CAN bus lines.

Q: Is the check result normal?

YES : Go to Step 3.

NO : Repair the CAN bus lines. On completion, go to Step 2.

STEP 2. Diagnostic trouble code recheck after resetting CAN bus lines.
1. Turn the ignition switch to the "ON" position.
2. TPMS transmitter ID registration.
3. Turn the ignition switch to the "LOCK" (OFF) position.
4. Turn the ignition switch to the "ON" position.
5. Check if the DTC is set.
6. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the diagnostic trouble code C1900 set?

YES : Go to Step 3.

NO : The procedure is complete.

STEP 3. TPMS transmitter ID registration.
Refer to Tire Pressure Sensor ID Registration.

Q: Is the TPMS transmitter ID registration completed normally?

YES : Go to Step 5.

NO : Replace the TPMS transmitter whose ID code cannot be registered. Then go to Step 4.

STEP 4. TPMS transmitter ID registration.
Refer to Tire Pressure Sensor ID Registration.

Q: Is the TPMS transmitter ID registration completed normally?

YES : Go to Step 5.

NO : Replace the WCM and register the ID codes. Then go to Step 5.

STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is set.
1. Turn the ignition switch to the "ON" position.
2. TPMS transmitter ID registration.
3. Turn the ignition switch to the "LOCK" (OFF) position.
4. Turn the ignition switch to the "ON" position.
5. Check if the DTC is set.
6. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the diagnostic trouble code C1900 reset?

YES : Replace the WCM and register the ID codes. Then start over at Step 1.

NO : The procedure is complete.