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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.
  1. Turn ignition switch from LOCK to ACC or ON position. If AIR BAG warning light does not illuminate for about 6 seconds, diagnose AIR BAG warning light circuit malfunction. See AIR BAG WARNING LIGHT DOES NOT ILLUMINATE . If AIR BAG warning light illuminates for about 6 seconds, go to next step.
  2. Measure voltage between DLC3 terminals Tc and CG. See Figure. If 10-14 volts is present, go to step  4. 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 CG. See WIRING DIAGRAMS . If 10-14 volts is not present, go to next step.
  4. Turn ignition switch to LOCK position. Disconnect negative battery cable and wait at least 90 seconds. Access and disconnect air bag sensor assembly connector A18 (center connector). See AIR BAG SENSOR ASSEMBLY  under REMOVAL & INSTALLATION. Connect one end of jumper wire to harness side of air bag sensor assembly connector A18, terminal No. 19 (Circuit Tc, Pink/Black wire). See Figure. Leave other end of jumper wire disconnected. Reconnect air bag sensor assembly connector with jumper wire connected. Connect negative battery cable and Turn ignition switch to ON position. Wait at least 20 seconds. Connect unconnected end of jumper wire to ground. If AIR BAG warning light does not illuminate, replace air bag sensor assembly. If AIR BAG warning light illuminates, check Pink/Black wire between air bag sensor assembly and DLC3.
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