Diagnostic Procedure
WARNING: This page is about a different car, the 2002 Toyota Prius. 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 left engine compartment fuse block. If fuse is faulty, replace fuse and go to step 3. 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 ON position. Measure voltage between ground and air bag sensor assembly connector A18, terminal No. 3 (circuit LA, Black/Yellow wire). See Fig 1. If 10-14 volts is not present, repair AIR BAG warning light bulb or circuit. If 10-14 volts is present, 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 .