B1556

DTC B1556: Seat Slide Sensor System for Fault 2 (Malfunction of Seat Slide Sensor)

CAUTION: If DTC B1556 is set in the SRS-ECU, always diagnose the CAN main bus line.

DTC SET CONDITIONS
These DTCs are set if the following conditions are detected from the seat slide sensor output:
- Seat slide sensor is not operating.
- Seat slide sensor characteristics are abnormal.
- Seat slide sensor output is abnormal.

TROUBLESHOOTING HINTS
Malfunction of seat slide sensor

DIAGNOSIS

Required Special Tools:
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A

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. 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 : Go to Step 3.

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

STEP 3. Check the seat slide sensor. (Using scan tool MB991958, read the diagnostic trouble code.)

Replace seat slide sensor.
Check the diagnostic trouble code.

Q: Is either DTC B1556 set?

YES : Replace the SRS-ECU.

NO : The procedure is complete.