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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 to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds. Access and disconnect air bag sensor assembly connector A18 (center connector). See AIR BAG SENSOR ASSEMBLY  under REMOVAL & INSTALLATION.
  2. Measure resistance between ground and air bag sensor assembly connector A18, terminal No. 19 (circuit Tc, Pink/Black wire). See Figure. If resistance is more than one megohm, replace air bag sensor assembly. If resistance is less than one megohm, replace harness or connector.
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