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DTC B1556: Driver’s Seat Slide Sensor Malfunction (Occupant Classification-ECU)
 
 
cautionIf DTC B1556 is set in the Occupant classification-ECU, always diagnose the CAN main bus line.
 
 
DTC SET CONDITION
This DTC is 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
STEP 1. Using scan tool (M.U.T.-IIISE), diagnose the CAN bus line.
(1)
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn off the power supply mode of the electric motor switch before connecting or disconnecting scan tool (M.U.T.-IIISE).
Connect scan tool (M.U.T.-IIISE). Refer to "How to connect the scan tool ."
(2) Turn on the power supply mode of the electric motor switch.
(3) Diagnose the CAN bus line.
(4) Turn off the power supply mode of the electric motor switch.
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 DTC.
Check if the DTC is set to the occupant classification-ECU.
Is DTC set?
Diagnose the occupant classification-ECU (Refer to ). Then go to Step 3.
Go to Step 3.
 
STEP 3. Recheck for DTC.
Check again if the DTC is set.
(1) Erase the DTC.
(2) Turn on the power supply mode of the electric motor switch.
(3) Check if the DTC is set.
(4) Turn off the power supply mode of the electric motor switch.
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 ).