Test 37A - Diagnosing Seat Belt Warning Light Circuit

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION. For wiring diagrams, see WIRING DIAGRAMS article in the ENGINE PERFORMANCE Section. Perform TEST VER - 1A after each repair.

CAUTION: Always turn ignition switch to OFF position prior to disconnecting or connecting any module connector.

Turn ignition switch to ON position. If seat belt warning light is on constantly, go to TEST 37B. If seat belt warning light is not on constantly, ensure left front seat belt is not fastened. Using DRB-II, read seat belt switch status. If DRB-II does not display SEAT BELT CLOSED, go to TEST 37C.
If DRB-II displays SEAT BELT CLOSED, fasten left front seat belt. If DRB-II does not display SEAT BELT OPEN, go to TEST 37D. If DRB-II displays SEAT BELT OPEN, actuate seat belt warning light test using DRB-II. If seat belt warning light flashes, retest system. If seat belt warning light does not flash, turn ignition switch to OFF position.
Disconnect Blue body controller connector. Body controller is located under left side of instrument panel. Check connector, and clean or repair connector as necessary. Turn ignition switch to ON position.
Using DRB-II in voltmeter mode, check voltage of seat belt switch output circuit at Blue body controller connector terminal No. 21 (Dark Blue/Red wire). If voltage is more than 10 volts, replace body controller. If voltage is less than 10 volts, turn ignition switch to OFF position.
Disconnect warning light connector at instrument cluster. Turn ignition switch to ON position. Check voltage of fused ignition feed circuit at warning light connector terminal No. 7 (Dark Blue/White wire).
If voltage is less than 10 volts, repair open in Dark Blue/White wire. If voltage is more than 10 volts, inspect seat belt warning light bulb and connector. If bulb is blown or connector is damaged, repair as necessary. If bulb and connector are okay, repair open in Dark Blue/Red wire.