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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.
  1. Turn ignition switch from LOCK to ACC or ON position. If AIR BAG warning light does not illuminate for about 6 seconds, repair AIR BAG warning light circuit. See WIRING DIAGRAMS . If AIR BAG warning light illuminates for about 6 seconds, go to next step.
  2. Ensure ignition switch is in ACC or ON position. Measure voltage between DLC3 terminals Tc and CG. See Figure. If 10-14 volts is present, check multiplex system. If 10-14 volts is not present, go to next step.
  3. Measure voltage between ground and DLC3 terminal Tc. If 10-14 volts is present, repair harness between ground and DLC3 terminal E1. See WIRING DIAGRAMS . If 10-14 volts is not present, check multiplex communication system and go to next step.
  4. Turn ignition switch to ACC or ON position. Wait at least 20 seconds. Retrieve codes. See RETRIEVING CODES  under DIAGNOSTICS. If no DTC is output, replace air bag sensor assembly. See AIR BAG SENSOR ASSEMBLY  under REMOVAL & INSTALLATION. If DTC is output, system operation is normal at this time. Check for intermittent fault. See AIR BAG WARNING LIGHT INTERMITTENT .
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