NOTE During testing if DTCs other than DTC B are displayed disregard them

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Diagnostic Procedure

1. Disable air bag system. See DISABLING SYSTEM under DISABLING & ACTIVATING AIR BAG SYSTEM.

2. Measure resistance between Yellow/Violet wire (circuit ICL+) and Yellow/Orange wire (circuit ICL-) of air bag sensor assembly side of left side head impact air bag module squib harness connector. See WIRING DIAGRAMS . If resistance is more than one ohm, repair or replace harness or connector

2004 ACCESSORIES/SAFETY EQUIPMENT Toyota - Air Bag Restraint Systems between left side head impact air bag module and air bag sensor assembly. If resistance is less than one ohm, go to next step.

3. Reconnect air bag sensor assembly connector A19 (left connector) to air bag sensor assembly. Connect jumper wire between Yellow/Violet wire (circuit ICL+) and Yellow/Orange wire (circuit ICL-) of air bag sensor assembly side of left side head impact air bag module squib harness connector. Connect negative battery cable. Wait at least 2 seconds. Turn ignition switch to ON position. Wait at least 20 seconds. Clear DTCs. See CLEARING CODES under DIAGNOSTICS. Turn ignition switch to LOCK position. Wait at least 20 seconds. Turn ignition switch to ON position. Wait at least 20 seconds. Retrieve DTCs. See RETRIEVING CODES under DIAGNOSTICS. If DTC 88/B1166 is not displayed, go to next step. If DTC 88/B1166 is displayed, replace air bag sensor assembly.

4. Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds. Reconnect left side head impact air bag module connector. Connect negative battery cable. Wait at least 2 seconds. Turn ignition switch to ON position. Wait at least 20 seconds. Clear DTCs. See CLEARING CODES under DIAGNOSTICS. Turn ignition switch to LOCK position. Wait at least 20 seconds. Turn ignition switch to ON position. Wait at least 20 seconds. Retrieve DTCs. See RETRIEVING CODES under DIAGNOSTICS. If DTC 88/B1166 is not displayed, system is functioning properly at this time. Check for intermittent fault. See AIR BAG WARNING LIGHT INTERMITTENT . If DTC 88/B1166 is displayed, replace left side head impact air bag module.

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