B1C25

DTC B1C23: Passenger Seat Weight Sensor (front: LH) Configuration Mismatch
DTC B1C24: Passenger Seat Weight Sensor (front: RH) Configuration Mismatch
DTC B1C25: Passenger Seat Weight Sensor (rear: LH) Configuration Mismatch
DTC B1C26: Passenger Seat Weight Sensor (rear: RH) Configuration Mismatch

CAUTION: If DTC B1C23, B1C24 B1C25, B1C26 is set in the occupant classification-ECU, always diagnose the CAN main bus lines.

DTC SET CONDITIONS
The DTC is set if the weight sensor serial No. of the coding data in the occupant classification-ECU does not match the serial No. sent from the weight sensor. .

TROUBLESHOOTING HINTS
- Zero calibration not executed

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 (Vehicles with CAN communication system)

STEP 1. Using scan tool MB991958, diagnose the CAN bus line.

CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.




1. Connect scan tool MB991958. Refer to "How to connect the scan tool." Scan Tool Connecting
2. Turn the ignition switch to the "ON" position.
3. Diagnose the CAN bus line.
4. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the CAN bus line found to be normal?

YES: Go to Step 2.

NO: Repair the CAN bus line (Refer to Controller Area Network, Diagnosis).

STEP 2. Recheck for diagnostic trouble code.

Check again if the DTC is set.

1. Erase the DTC.
2. Turn the ignition switch to the "ON" position.
3. Check if the DTC is set.
4. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the DTC set?

YES: Perform the zero calibration.

NO: There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to general (Body and Chassis), How to Cope with Intermittent Malfunction).