Diagnostic Procedure
WARNING: This page is about a different car, the 2004 Toyota Matrix and 2004 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
- Measure voltage at battery. If 10-14 volts is present, go to next step. If 10-14 volts is not present, repair or replace battery and/or charging system as necessary.
- Disable air bag system. Access air bag sensor assembly and disconnect all harness connectors. See AIR BAG SENSOR ASSEMBLY under REMOVAL & INSTALLATION. Connect negative battery cable. Wait at least 2 seconds. Turn ignition switch to ON position. If AIR BAG warning light does not illuminate, go to next step. If AIR BAG warning light does illuminate, replace air bag sensor assembly.
- Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds. Access instrument cluster and disconnect harness connector. See INSTRUMENT CLUSTER under REMOVAL & INSTALLATION. Connect negative battery cable. Wait at least 2 seconds. Measure voltage between air bag sensor assembly connector A13, terminal No. 3 (circuit LA, Black/Yellow wire). See Fig 1. If voltage is less than one volt, repair or replace wire harness between instrument cluster and battery. If voltage is more than one volt, repair or replace wire harness between instrument cluster and air bag sensor assembly.