Diagnostic Procedure
WARNING: This page is about a different car, the 2002 Lexus RX 300. However, it is still accessible from the selected car via links, so may be relevant.
- Remove AM2 fuse and check continuity across fuse blades. AM2 fuse is located in instrument panel fuse block at left side of instrument panel. If fuse is faulty, replace fuse and go to step 4. If fuse is okay, reinstall fuse and go to next step.
- Disable air bag system. See DISABLING SYSTEM under DISABLING & ACTIVATING AIR BAG SYSTEM. Reconnect negative battery cable. Turn ignition switch to ACC or ON position. Measure voltage between ground and air bag sensor assembly connector C8, terminal No. 5 (circuit LA, Black/Yellow wire). See Fig 1. If 10-14 volts is not present, repair AIR BAG warning light bulb or circuit. See WIRING DIAGRAMS . If 10-14 volts is present, go to next step.
- Turn ignition switch to LOCK position. Disconnect negative battery cable. Reconnect 3 air bag sensor assembly connectors. Leave all other components disconnected. Reconnect negative battery cable and wait at least 2 seconds. Turn ignition switch to ACC or ON position. If AIR BAG warning light operation is okay, system operation is normal at this time. Check for intermittent fault. See AIR BAG WARNING LIGHT INTERMITTENT . If AIR BAG warning light does not come on, check for poor connection at air bag sensor assembly connector C8, terminal No. 5 (Black/Yellow wire). If connection is okay, replace air bag sensor assembly.
- Recheck AM2 fuse. If fuse is blown, check harness between AM2 fuse and AIR BAG warning light. If fuse is okay, check for intermittent fault. See AIR BAG WARNING LIGHT INTERMITTENT .