Test 31A: Driver Seat Belt Switch Open

WARNING: This page is about a different car, the 2002 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Prior to performing any air bag system test, go to PRETEST INSPECTION & DIAGNOSTIC PROCEDURE under DIAGNOSTICS. Perform TEST VER-1: AIR BAG VERIFICATION TEST after all repairs unless otherwise directed.
Air Bag Control Module (ACM) harness connectors C1 and C2 are identical, except for wire colors and terminal usage. See WIRING DIAGRAMS .

Turn ignition switch to ON position. Using DRBIII, determine if DRIVER SEAT BELT SWITCH OPEN is active or stored Diagnostic Trouble Code (DTC). If DRIVER SEAT BELT SWITCH OPEN is an active DTC, go to next step. If DRIVER SEAT BELT SWITCH OPEN is a stored DTC, go to TEST 1B: REPAIRING STORED CODES .
Turn ignition switch to OFF position. Disconnect driver-side front seat belt switch connector. See SEAT BELT SWITCH under REMOVAL & INSTALLATION. Turn ignition switch to ON position. Measure voltage between Dark Green wire (line 1 circuit) and Light Blue wire (line 2 circuit) on harness side of seat belt switch connector. See WIRING DIAGRAMS . If voltage is present, replace driver-side seat belt switch. If voltage is not present, go to next step.
Disable air bag system. See DISABLING SYSTEM under DISABLING & ACTIVATING AIR BAG SYSTEM. Access and disconnect Air Bag Control Module (ACM) harness connector C2. See AIR BAG CONTROL MODULE (ACM) under REMOVAL & INSTALLATION. Connect appropriate SRS load tool adapter to harness side of ACM connector C2. Measure resistance in Dark Green wire between ACM SRS load tool adapter and harness side of seat belt switch connector. Measure resistance in Light Blue wire between ACM SRS load tool adapter and harness side of seat belt switch connector. If resistance is less than one ohm in both circuits, replace ACM. If resistance is more than one ohm in either circuit, repair open in appropriate wire.