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Code 12

WARNING: This page is about a different car, the 1995 Toyota Paseo. 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 (if equipped), accessible through finish plate in glove box. See Figure.
  2. Disconnect center air bag sensor connector. At center air bag sensor connector, measure resistance between terminals +SR and -SR, and between terminals +SL and -SL. See Figure. If resistance is not 755-885 ohms, go to CODE 15 .
  3. If resistance is 755-885 ohms, reconnect negative battery cable. Turn ignition switch to ON position. Measure voltage between body ground and terminals +SR and +SL of center air bag sensor connector. If more than 0.1 volt is present, replace harness between center air bag sensor and front air bag sensor or repair front air bag sensor connector. See WIRE REPAIR .
  4. If less than 0.1 volt is present, measure voltage between body ground and positive (+) terminal of spiral cable upper connector. See Fig 1. If voltage is present, go to step 13). If no voltage is present:
    Fig 1: Terminal ID of Spiral Cable Upper Connector & Passenger-Side Air Bag Connector
    G93J75548Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • Go to next step (with passenger-side air bag)
    • Go to step 6) (without passenger-side air bag).
  5. Measure voltage between body ground and positive (+) terminal of passenger-side air bag connector. See Fig 1. If voltage is present, replace harness between center air bag sensor and passenger-side air bag. If no voltage is present, go to next step.
  6. 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 (if equipped). Reconnect negative battery cable. Wait at least 2 seconds. Turn ignition switch to ACC or ON position. Wait at least 20 seconds.
  7. 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. Use Wiring Check Harness (09843-18020) to connect terminals Tc and E1 of DLC. See Figure.
  8. 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).
  9. 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.
  10. 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, turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds. Reconnect passenger-side air bag connector.
  11. 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 & TESTING.
  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. See Fig 1. If any voltage is present, replace spiral cable. If no voltage is present, replace harness between center air bag sensor and spiral cable.
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