Diagnostic Procedure
WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
- Disable air bag system. See DISABLING SYSTEM under DISABLING & ACTIVATING AIR BAG SYSTEM. Connect negative battery cable.
- Measure voltage between ground and Yellow/Red wire on air bag sensor assembly side of passenger-side air bag module harness connector. See WIRING DIAGRAMS . If voltage is less than one volt, go to next step. If voltage more than one volt, repair or replace harness or connector between passenger-side air bag module and air bag sensor assembly.
- Disconnect negative battery cable. Wait 90 seconds. Reconnect air bag sensor assembly connectors. Connect jumper wire between Yellow/Red wire and Yellow/Green wire on air bag sensor assembly side of passenger-side air bag module harness connector. Connect negative battery cable. Wait at least 2 seconds. Turn ignition switch to ACC or ON position. Wait at least 20 seconds. Clear DTCs. See CLEARING CODES under DIAGNOSTICS. Turn ignition switch to LOCK position. Wait at least 20 seconds. Turn ignition switch to ACC or ON position. Wait at least 20 seconds. Retrieve codes. See RETRIEVING CODES under DIAGNOSTICS. If DTC 52/B0108 is retrieved, replace air bag sensor assembly. If DTC 52/B0108 is not retrieved, go to next step.
- Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds. Reconnect passenger-side air bag module connector. Reconnect negative battery cable. Wait at least 2 seconds. Turn ignition switch to ACC or ON position. Wait at least 20 seconds. Clear DTCs. Turn ignition switch to LOCK position. Wait at least 20 seconds. Turn ignition switch to ACC or ON position. Wait at least 20 seconds. Retrieve codes. If DTC 52/B0108 is retrieved, replace passenger-side air bag module. If DTC 52/B0108 is not retrieved, system is functioning properly at this time. Check for intermittent fault. See AIR BAG WARNING LIGHT INTERMITTENT .