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DTC B1556: Driver’s Seat Slide Sensor Malfunction (Occupant Classification-ECU)
 
 
cautionIf DTC B1556 is stored in the Occupant classification-ECU, always diagnose the CAN main bus line.
 
 
DTC SET CONDITION
This DTC is stored 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
STEP 1. Using scan tool (M.U.T.-III), diagnose the CAN bus line.
(1)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III). Refer to "How to connect the scan tool ."
(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.
Is the CAN bus line found to be normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C, Diagnosis ).
 
STEP 2. Recheck for diagnostic trouble code.
Check if the DTC is stored to the occupant classification-ECU.
Is DTC stored?
Diagnose the occupant classification-ECU (Refer to ). Then go to Step 3.
Go to Step 3.
 
STEP 3. Recheck for diagnostic trouble code.
Check again if the DTC is stored.
(1) Erase the DTC.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is stored.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the DTC stored?
Replace the SRS-ECU (Refer to ).
There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).