Diagnostic Procedure
WARNING: This page is about a different car, the 2002 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
- Turn ignition switch to LOCK position. Disable air bag system. See DISABLING SYSTEM under DISABLING & ACTIVATING AIR BAG SYSTEM. Access air bag sensor assembly and ensure harness connectors are fully connected. See AIR BAG SENSOR ASSEMBLY under REMOVAL & INSTALLATION. If air bag sensor assembly harness connectors are not fully connected, reconnect connectors. If air bag sensor assembly harness connectors are not fully connected, go to next step.
- Access instrument cluster and disconnect harness connector C11. See INSTRUMENT CLUSTER under REMOVAL & INSTALLATION. Reconnect negative battery cable. Turn ignition switch to ON position. Measure voltage between ground and component side of instrument cluster connector C11, terminal No. 5. (circuit SW). See Figure. If voltage is less than 8 volts, replace instrument cluster. If voltage is more than 8 volts, go to next step.
- Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds. Disconnect air bag sensor assembly harness connector A17. Measure resistance between ground and harness side of air bag sensor assembly connector, terminal No. 3 (Black Yellow wire, circuit LA). See Fig 1. If resistance is less than one megohm, replace air bag sensor assembly. If resistance is more than one megohm repair or replace wiring harness between air bag sensor assembly and instrument cluster. See WIRING DIAGRAMS .