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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. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Reconnect negative battery terminal.
  2. Turn ignition to ON position. Measure voltage between ground and air bag sensor assembly connector A18, terminals No. 15 (circuit SL+, White/Red wire) and No. 26 (circuit SL-, Brown wire). See Figure. If voltage is less than one volt, go to next step. If voltage is more than one volt, go to step  8.
  3. Turn ignition switch to LOCK position. Measure resistance between ground and air bag sensor assembly connector A18, terminals No. 15 (circuit SL+, White/Red wire) and No. 26 (circuit SL-, Brown wire). See Figure. If resistance is more than one megohm, go to next step. If resistance is less than one megohm, go to step  9.
  4. Measure resistance between air bag sensor assembly connector A18 terminals No. 15 (circuit SL+, White/Red wire) and No. 26 (circuit SL-, Brown wire). See Figure. If resistance is more than one megohm, go to next step. If resistance is less than one megohm, go to step  10.
  5. Connect jumper wire between White/Red and Brown wires of left front air bag sensor harness connector (sensor connector). Measure resistance between air bag sensor assembly connector A18 terminals No. 15 (circuit SL+, White/Red wire) and No. 26 (circuit SL-, Brown wire). See Figure. If resistance is less than one ohm, go to next step. If resistance is more than one ohm, go to step  11.
  6. Measure resistance between left front air bag sensor assembly terminals. If resistance is 300-1500 ohms, go to next step. If resistance is not 300-1500 ohms, replace left front air bag sensor assembly.
  7. Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds. Connect left front air bag sensor and air bag sensor assembly connector A18. Connect negative battery cable. Wait at least 20 seconds. Turn ignition switch to ON position. 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 codes. See RETRIEVING CODES  under DIAGNOSTICS. If DTC 16/B1158 or B1159 is displayed, replace air bag sensor assembly. If DTC 16/B1158 or B1159 is not displayed, system is functioning properly at this time. Check for intermittent fault. See AIR BAG WARNING LIGHT INTERMITTENT  under DIAGNOSTIC TESTS.
  8. Disconnect left front air bag sensor Yellow 4-pin sub-harness connector. Connector is located under right side of instrument panel behind kick panel. Measure voltage between ground and White/Red and Brown wires of left front air bag sensor side of Yellow 4-pin sub-harness connector. If voltage is less than one volt, repair or replace air bag harness or connector between air bag sensor assembly and Yellow 4-pin sub-harness connector. If voltage is more than one volt, repair or replace front air bag sensor sub-harness or connector between left front air bag sensor and Yellow 4-pin sub-harness connector.
  9. Disconnect left front air bag sensor Yellow 4-pin sub-harness connector. Connector is located under right side of instrument panel behind kick panel. Measure resistance between ground and White/Red and Brown wires of left front air bag sensor side of Yellow 4-pin sub-harness connector. If resistance is more than one megohm, repair or replace air bag harness or connector between air bag sensor assembly and Yellow 4-pin sub-harness connector. If resistance is less than one megohm, repair or replace front air bag sensor sub-harness or connector between left front air bag sensor and Yellow 4-pin sub-harness connector.
  10. Disconnect left front air bag sensor Yellow 4-pin sub-harness connector. Connector is located under right side of instrument panel behind kick panel. Measure resistance between White/Red and Brown wires of left front air bag sensor side of Yellow 4-pin sub-harness connector. If resistance is more than one megohm, repair or replace air bag harness or connector between air bag sensor assembly and Yellow 4-pin sub-harness connector. If resistance is less than one megohm, repair or replace left front air bag sensor sub-harness or connector between front air bag sensor and Yellow 4-pin sub-harness connector.
  11. Disconnect left front air bag sensor Yellow 4-pin sub-harness connector. Connector is located under right side of instrument panel behind kick panel. Connect jumper wire between White/Red and Brown wires of left front air bag sensor sub harness connector (sensor connector). Measure resistance between White/Red and Brown wires of left front air bag sensor side of Yellow 4-pin sub-harness connector. If resistance is more than one ohm, repair or replace front air bag sensor sub-harness or connector between front air bag sensor and Yellow 4-pin sub-harness connector. If resistance is less than one ohm, repair or replace air bag harness or connector between air bag sensor assembly and Yellow 4-pin sub-harness connector.
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