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DTC B1556: Driver’s seat slide sensor malfunction
 
 
cautionIf DTC B1556 is set in the SRS-ECU, always diagnose the CAN main bus line.
 
 
DTC SET CONDITION
This DTC is set if communication between the SRS-ECU and the seat slide sensor is not possible or communication is faulty.
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the seat slide sensor
  • Malfunction of SRS-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. Using scan tool (M.U.T.-III), read the SRS-ECU diagnostic trouble code.
Check if the DTC is set in the SRS-ECU.
Is DTC set?
Diagnose the SRS-ECU (Refer to ) Then go to Step 3.
Go to Step 3.
 
STEP 3. Check the seat slide sensor.
Checked whether the seat slide sensor is normal (Refer to ).
Is the check result normal?
Go to Step 4.
Replace the seat slide sensor (Refer to ).
 
STEP 4. 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.
Is the DTC set?
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 ).