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DTC B1558: OCM (Occupant Classification-ECU) DTC Present
 
 
caution
  • If DTC B1558 is stored in the SRS-ECU, always diagnose the CAN main bus line.
  • If the vehicle is brought to your workshop as the same DTC is set again after it was cleared, replace the passenger seat cushion frame assembly (RH).
 
 
DTC SET CONDITION
It is set if a DTC occurs in the occupant classification-ECU.
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the occupant classification-ECU
  • Malfunction of the SRS-ECU
 
 
DIAGNOSIS
STEP 1. Using scan tool MB991958, diagnose the CAN bus line.
(1)
cautionTo prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
Connect scan tool MB991958. 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 that the DTC is stored in the occupant classification-ECU.
Is the 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 in the SRS-ECU.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3) Check if DTC is stored.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the DTC stored?
Replace the passenger seat cushion frame assembly (RH) (Refer to GROUP 52A, Front Seat Assembly ). Then go to Step 4.
There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to GROUP 00, How to use Troubleshooting/inspection Service Points ).
 
STEP 4. Recheck for diagnostic trouble code.
Check again if the DTC is stored in the SRS-ECU.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3) Check if 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 use Troubleshooting/inspection Service Points ).