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DTC B1877, B1878, B1879, B1885

id080200801400

DTC | B1877 | Driver-side pre-tensioner seat belt system resistance high
B1878 | Driver-side pre-tensioner seat belt system circuit short to power supply
B1879 | Driver-side pre-tensioner seat belt system circuit short to ground
B1885 | Driver-side pre-tensioner seat belt system resistance low
DETECTION CONDITION | Warning • Detection conditions are for understanding the DTC outline before performing an inspection. Performing an inspection with only 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 1.5-3.1 ohm 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 • Using the WDS or equivalent, verify the following PID/DATA monitor. (See PID/DATA MONITOR TABLE.) - D_PTENSFLT • Is the resistance of the driver-side pre-tensioner seat belt normal? - Resistance: 1.5-3.1 ohm | Yes | Replace the SAS control module. (See SAS CONTROL MODULE REMOVAL/INSTALLATION.)
No | Go to the next step.
2 | 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. (See SERVICE WARNINGS.) (See SERVICE CAUTIONS.) • Turn ignition switch to LOCK position. • Disconnect the negative battery cable and wait for 1 min or more. • Remove driver's side B-pillar lower trim. • Disconnect the driver-side pre-tensioner seat belt connector. • 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.
3 | VERIFY WHETHER MALFUNCTION IS IN DRIVER-SIDE PRE-TENSIONER SEAT BELT OR RELATED WIRING HARNESS • Connect leads of SST (Fuel and thermometer checker) or apply 2-ohm resistor to driver-side pre-tensioner seat belt connector terminal A and B. • Set resistance of SST (Fuel and thermometer checker) to the 2-ohm position. • Connect the negative battery cable. • Turn the ignition switch to ON position. • Are DTCs 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 WIRING HARNESS BETWEEN DRIVER-SIDE PRE-TENSIONER SEAT BELT MODULE AND SAS CONTROL MODULE • Turn the ignition switch to the LOCK position. • Disconnect the negative battery cable and wait for 1 min or more. • Disconnect the driver and passenger-side front seat connectors. • Disconnect the driver and passenger-side curtain air bag module connectors. • Turn up floor covering. • Inspect the wiring harness between SAS control module terminal 2S and driver-side pre-tensioner seat belt terminal A, SAS control module terminal 2P and driver-side pre-tensioner seat belt terminal B for the following: - Short to ground - Short to power supply - Open circuit • Is the wiring harness normal? | Yes | Replace the SAS control module. (See SAS CONTROL MODULE REMOVAL/INSTALLATION.)
No | Replace the air bag wiring harness.