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DTC B1426, B1427

BHE080201046W10

DTC | B1426 | Seat belt warning light circuit short to power supply
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B1427 | Seat belt warning light circuit open
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. • Malfunction in the seat belt warning light circuit
POSSIBLE CAUSE | • Instrument cluster malfunction • Malfunction of the connectors between the instrument cluster and SAS unit • Open or short circuit in the wiring harness between the battery and the instrument cluster • Open or short circuit in the wiring harness between the instrument cluster and SAS unit • SAS unit malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | INSPECT FOR CONTINUITY BETWEEN BATTERY FUSE AND INSTRUMENT CLUSTER • Connect negative battery cable. • Turn the ignition switch to the ON position. • Measure the voltage at instrument cluster connector terminal 2A. • Is the voltage 9 V or more? | Yes | Go to the next step.
No | Repair the related wiring harness.
2 | INSPECT WIRING HARNESS BETWEEN INSTRUMENT CLUSTER AND SAS UNIT 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.) (SeeSERVICE CAUTIONS.) • Turn the ignition switch to the LOCK position. • Disconnect the negative battery cable and wait for 1 min or more. • Remove the column cover. • Disconnect the clock spring connector. • Remove the glove compartment. • Disconnect the passenger-side air bag module connector. • Disconnect the driver and passenger-side curtain air bag module connectors. • Disconnect the driver and passenger-side side air bag module connectors. • Remove the rear door lower trim. • Disconnect the driver and passenger-side pre-tensioner seat belt connectors. • Partially peel back the floor covering. • Disconnect the SAS unit connector. • Disconnect the instrument cluster connector. • Inspect the wiring harness between SAS unit terminal 1E and instrument cluster terminal 2A for the following: – Short to ground – Short to power supply – Open circuit • Is the wiring harness normal? | Yes | Go to the next step.
No | Replace the air bag wiring harness.
3 | INSPECT SEAT BELT WARNING LIGHT • Connect the instrument cluster connector. • Ground instrument cluster connector terminal 2G using a jumper wire. • Turn the ignition switch to the ON position. • Does the seat belt warning light illuminate? | Yes | [Present malfunction diagnosis] • Replace the SAS unit. (See SAS UNIT REMOVAL/INSTALLATION.) [Past malfunction diagnosis] • DTC troubleshooting completed.
No | Replace the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)