Possible Causes

Seat belt warning light circuit open, short to ground or short to power can be caused by instrument cluster malfunction, instrument cluster malfunction, improper connection of connectors between instrument cluster and SAS control module, open or short circuit in wiring harness between fuse No. 1 and SAS control module or SAS control module malfunction.

1. Inspect for continuity between fuse No. 1 & instrument cluster
   
   Turn ignition switch to ON position. Measure voltage between ground and instrument cluster connector No. 2, terminal No. 2V. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. See Figure . If voltage is more than 9 volts, go to next step. If voltage is less than 9 volts, repair appropriate wiring harness.
2. Inspect wiring harness between instrument cluster & SAS control module
   
   Turn ignition to LOCK position. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Remove steering column cover and disconnect clockspring connector. Remove glove box and disconnect passenger-side air bag module connectors. Disconnect right and left side air bag module connectors. See SIDE AIR BAG MODULE  under REMOVAL & INSTALLATION. Disconnect right and left side curtain air bag module connectors. See SIDE CURTAIN AIR BAG MODULE  under REMOVAL & INSTALLATION. Remove right and left rear door lower trims and disconnect seat belt pretensioner connectors. See SEAT BELT PRETENSIONER  under REMOVAL & INSTALLATION. Disconnect instrument cluster connectors. Measure for short to ground, short to power or open circuit between SAS control module connector No. 1, terminal No. 1T and instrument cluster connector No. 2, terminal No. 2K. See Figure & Figure . If short to ground, short to power or open circuit is detected, replace wiring harness. If wiring harness is okay, go to next step.
3. Inspect AIR BAG warning light
   
   Connect instrument cluster connectors. Connect negative battery cable. Turn ignition switch to ON position. Inspect AIR BAG warning light. If AIR BAG warning light is illuminated, go to next step. If AIR BAG warning light is not illuminated, replace instrument cluster.
4. Inspect AIR BAG warning light
   
   Connect a jumper wire between ground and instrument cluster connector No. 2, terminal No. 2K. Inspect AIR BAG warning light. If AIR BAG warning light goes out and performing present malfunction diagnosis, replace SAS control module. If seat belt warning light goes out and performing past malfunction diagnosis, test is complete. If AIR BAG warning light stays on, replace instrument cluster.