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Code 12

WARNING: This page is about a different car, the 1995 Toyota Tercel. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: During testing, if codes other than Code 12 are displayed, disregard them.
  1. Disconnect negative battery cable. Wait at least 90 seconds. Remove steering wheel pad. See STEERING WHEEL PAD & SPIRAL CABLE  under REMOVAL & INSTALLATION. Disconnect passenger-side air bag harness connector, accessible through finish plate in glove box. See Figure.
  2. Disconnect center air bag sensor connector. Reconnect negative battery cable. Measure voltage between body ground and positive (+) terminal of spiral cable upper connector. If any voltage is present, go to step 13). If no voltage is present:
    • Go to next step (with passenger-side air bag)
    • Go to step 4) (without passenger-side air bag).
  3. Measure voltage between body ground and positive (+) terminal of passenger-side air bag connector. If no voltage is present, go to next step. If any voltage is present, replace harness between center air bag sensor and passenger-side air bag.
  4. Turn ignition switch to LOCK position. Disconnect negative battery cable. Reconnect center air bag sensor connector. Connect a jumper wire between terminals of spiral cable upper connector. Connect a jumper wire between terminals of passenger-side air bag connector.
  5. Reconnect negative battery cable. Wait at least 2 seconds. Turn ignition switch to ACC or ON position. Wait at least 20 seconds.
  6. Clear codes. See CLEARING CODES  under SELF-DIAGNOSTIC SYSTEM. Turn ignition switch to LOCK position. Wait at least 20 seconds. Turn ignition switch to ACC or ON position. Wait at least 20 seconds. Use Wiring Check Harness (09843-18020) to connect terminals Tc and E1 of DLC. See Figure.
  7. If Code 12 is displayed, replace center air bag sensor. If Code 12 is not displayed, turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds. Reconnect spiral cable upper connector (steering wheel pad).
  8. Reconnect negative battery cable. Wait at least 2 seconds. Turn ignition switch to ACC or ON position. Wait a least 20 seconds. Clear codes. See CLEARING CODES  under SELF-DIAGNOSTIC SYSTEM. Turn ignition switch to LOCK position. Wait at least 20 seconds. Turn ignition switch to ACC or ON position. Wait at least 20 seconds.
  9. Use Wiring Check Harness (09843-18020) to connect terminals Tc and E1 of DLC. See Figure. If Code 12 is displayed, replace steering wheel pad. If Code 12 is not displayed:
    • Go to step 11) (with passenger-side air bag)
    • Go to next step (without passenger-side air bag).
  10. System is functioning properly at this time. Check for intermittent fault. See AIR BAG WARNING LIGHT INTERMITTENT  under DIAGNOSIS.
  11. Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds. Reconnect passenger-side air bag connector. Reconnect negative battery cable. Wait at least 2 seconds. Turn ignition switch to ACC or ON position. Wait a least 20 seconds. Clear codes. See CLEARING CODES  under SELF-DIAGNOSTIC SYSTEM. Turn ignition switch to LOCK position. Wait at least 20 seconds. Turn ignition switch to ACC or ON position. Wait at least 20 seconds.
  12. Use Wiring Check Harness (09843-18020) to connect terminals Tc and E1 of DLC. See Figure. If Code 12 is displayed, replace passenger-side air bag. If Code 12 is not displayed, system is functioning properly at this time. Check for intermittent fault. See AIR BAG WARNING LIGHT INTERMITTENT  under DIAGNOSIS.
  13. Turn ignition switch to LOCK position. Disconnect spiral cable lower connector. Turn ignition switch to ON position. Measure voltage between body ground and positive (+) terminal of spiral cable upper connector. If any voltage is present, replace spiral cable. If no voltage is present, replace harness between spiral cable and center air bag sensor.
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