B1BA3

DTC B1BA3: Driver's Seat Slide Sensor Malfunction (Occupant Classification-ECU)

CAUTION: If DTC B1BA3 is set in the Occupant classification-ECU, always diagnose the CAN main bus line.

DTC SET CONDITIONS
These DTCs are set if communication between the occupant classification-ECU and the seat slide sensor is not possible or communication is faulty.

TROUBLESHOOTING HINTS
- Malfunction of the seat slide sensor
- Malfunction of occupant classification-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 (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." How To Connect The Scan Tool (M.U.T.-III)
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.

STEP 2. Using scan tool MB991958, read the occupant classification-ECU diagnostic trouble code.

Check if the DTC is set to the occupant classification-ECU.

Q: Is DTC set?

YES : Diagnose the occupant classification-ECU. Then go to Step 3.

NO : Go to Step 3.

STEP 3. 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 : Replace the SRS-ECU.

NO : There is an intermittent malfunction such as poor engaged connector(s) or open circuit.