DTC B1054, B1877, B1878, B1879, B1885

id080200811200

DTC

B1054

Driver-side pre-tensioner seat belt and other air bag module circuits short

B1877

Driver-side pre-tensioner seat belt circuit resistance high

B1878

Driver-side pre-tensioner seat belt circuit short to power supply

B1879

Driver-side pre-tensioner seat belt circuit short to body ground

B1885

Driver-side pre-tensioner seat belt circuit resistance low
DETECTION CONDITION
Warning
•  Detection conditions are for understanding the DTC outline before performing an inspection. Performing an inspection according to only the detection conditions may cause injury due to an operating error, or damage the system. When performing an inspection, always follow the inspection procedure.
•  Resistance other than 0.9—6.23 ohms detected in driver-side pre-tensioner seat belt circuit
•  Malfunction in the wiring harness between driver-side pre-tensioner seat belt and SAS control module
POSSIBLE CAUSE
•  Open or short circuit in wiring harness between driver-side pre-tensioner seat belt and SAS control module
•  Driver-side pre-tensioner seat belt malfunction
•  SAS control module malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
INSPECT DRIVER-SIDE PRE-TENSIONER SEAT BELT CONNECTOR
Warning
•  Handling the air bag system components improperly can accidentally deploy the air bag modules and pre-tensioner seat belts, which may seriously injure you. Read the service warnings and cautions before handling the air bag system components.
•  Turn the ignition switch to the LOCK position.
•  Disconnect the negative battery cable and wait for 1 min or more.
•  Remove the B-pillar lower trim (LH). (See B-PILLAR LOWER TRIM REMOVAL/INSTALLATION.)
•  Disconnect the driver-side pre-tensioner seat belt connector. (See FRONT SEAT BELT REMOVAL/INSTALLATION.)
•  Is there any malfunction of the driver-side pre-tensioner seat belt connector?
Yes
Replace the air bag wiring harness.
No
Go to the next step.
2
INSPECT WIRING HARNESS BETWEEN DRIVER-SIDE PRE-TENSIONER SEAT BELT AND SAS CONTROL MODULE
•  Turn the ignition switch to the LOCK position.
•  Disconnect the negative battery cable and wait for 1 min or more.
•  Remove the column cover. (See COLUMN COVER REMOVAL/INSTALLATION.)
•  Disconnect the clock spring connector. (See COMBINATION SWITCH REMOVAL/INSTALLATION.)
•  Remove the glove compartment. (See GLOVE COMPARTMENT REMOVAL/INSTALLATION.)
•  Disconnect the passenger-side air bag module connector. (See PASSENGER-SIDE AIR BAG MODULE REMOVAL/INSTALLATION.)
•  Disconnect the driver and passenger-side front seat connectors. (See FRONT SEAT REMOVAL/INSTALLATION.)
•  Disconnect the driver and passenger-side curtain air bag module connectors. (See CURTAIN AIR BAG MODULE REMOVAL/INSTALLATION.)
•  Remove the B-pillar lower trim. (See B-PILLAR LOWER TRIM REMOVAL/INSTALLATION.)
•  Disconnect the driver and passenger-side pre-tensioner seat belt connectors. (See FRONT SEAT BELT REMOVAL/INSTALLATION.)
•  Disconnect the SAS control module connectors. (See SAS CONTROL MODULE REMOVAL/INSTALLATION.)
•  Inspect the wiring harness between SAS control module terminal 2J and driver-side pre-tensioner seat belt terminal A, SAS control module terminal 2N and driver-side pre-tensioner seat belt terminal B for the following:
―  Short to ground
―  Short to power supply
―  Open circuit
Note
•  Inspect for continuity while shaking the wiring harness between the driver-side pre-tensioner seat belt and SAS control module.
•  Is the wiring harness normal?
Yes
Go to the next step.
No
Replace the air bag wiring harness.
3
VERIFY WHETHER MALFUNCTION IS IN DRIVER-SIDE PRE-TENSIONER SEAT BELT OR RELATED WIRING HARNESS
•  Connect the leads of the SST (Fuel and thermometer checker) or apply 2-ohm resistance to driver-side pre-tensioner seat belt connector terminals A and B.
•  Set the resistance of the SST (Fuel and thermometer checker) to the 2-ohm position.
•  Connect the negative battery cable.
•  Turn the ignition switch to the ON position.
•  Are DTCs B1054, B1877, B1878, B1879, and/or B1885 indicated?
Yes
Go to the next step.
No
Replace the driver-side pre-tensioner seat belt.
(See FRONT SEAT BELT REMOVAL/INSTALLATION.)
4
INSPECT DTCs
•  Clear DTCs using the M-MDS.
(See CLEARING DTC.)
•  Verify DTCs using the M-MDS.
(See DTC DISPLAY.)
•  Is DTC B1054, B1877, B1878, B1879, and/or B1885 displayed again?
•  Are there other DTCs output?
Yes
Replace the SAS control module.
(See SAS CONTROL MODULE REMOVAL/INSTALLATION.)
No
DTC troubleshooting completed.