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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 78 (Air Bag Restraint Systems) >> Diagnostic Tests >> DTC 16/B1158 & B1159: Left Front Air Bag Sensor Malfunction >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Toyota Avalon. 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 cable.
  2. Turn ignition switch to ON position. Measure voltage between ground and air bag sensor assembly connector C6, terminal No. 15 (circuit SL+, White/Red wire). See Figure. Measure voltage between ground and air bag sensor assembly connector C6, terminal No. 26 (circuit SL-, Brown wire). If voltage is less than one volt, go to next step. If voltage is more than one volt, go to step  8.
  3. Measure resistance between ground and air bag sensor assembly connector C6, terminal No. 15 (White/Red wire). Measure resistance between ground and air bag sensor assembly connector C6, terminal No. 26 (Brown wire). 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 C6, terminals No. 15 (White/Red wire) and No. 26 (Brown wire). 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 front air bag sensor harness connector. Measure resistance between air bag sensor assembly connector C6, terminals No. 15 (White/Red wire) and No. 26 (Brown wire). 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 across left front air bag sensor terminals. If resistance is 300-1500 ohms, go to next step. If resistance is not 300-1500 ohms, replace left front air bag sensor.
  7. Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds. Reconnect left front air bag sensor. Reconnect air bag sensor assembly connector C6. Connect negative battery cable. Wait at least 20 seconds. Turn ignition switch to ACC or ON position. Clear DTCs. See CLEARING CODES  under DIAGNOSTICS. Turn ignition switch to LOCK position. Wait at least 20 seconds. Turn ignition switch to ACC or ON position. Wait at least 20 seconds. Retrieve DTCs. See RETRIEVING CODES  under DIAGNOSTICS. If DTC 16/B1158 or B1159 is displayed, replace left front air bag sensor. 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 2-pin sub-harness connector. Connector is located under left side of instrument panel, above and behind fuse block. Turn ignition switch to ON position. Measure voltage between ground and White/Red wire on front air bag sensor side of Yellow 2-pin sub-harness connector. Measure voltage between ground and Brown wire on front air bag sensor side of Yellow 2-pin sub-harness connector. If voltage in both tests is less than one volt, repair or replace harness or connector between air bag sensor assembly and sub-harness connector. If voltage in either test is more than one volt, repair or replace harness or connector between sub-harness connector and front air bag sensor.
  9. Disconnect left front air bag sensor Yellow 2-pin sub-harness connector. Connector is located under left side of instrument panel, above and behind fuse block. Measure resistance between ground and White/Red wire on front air bag sensor side of Yellow 2-pin sub-harness connector. Measure resistance between ground and Brown wire on front air bag sensor side of Yellow 2-pin sub-harness connector. If resistance in both tests is more than one megohm, repair or replace harness or connector between air bag sensor assembly and sub-harness connector. If resistance in either test is less than one megohm, repair or replace harness or connector between sub-harness connector and front air bag sensor.
  10. Disconnect left front air bag sensor Yellow 2-pin sub-harness connector. Connector is located under left side of instrument panel, above and behind fuse block. Measure resistance between White/Red and Brown wires on front air bag sensor side of Yellow 2-pin sub-harness connector. If resistance is more than one megohm, repair or replace harness or connector between air bag sensor assembly and sub-harness connector. If resistance is less than one megohm, repair or replace harness or connector between sub-harness connector and front air bag sensor.
  11. Disconnect left front air bag sensor Yellow 2-pin sub-harness connector. Connector is located under left side of instrument panel, above and behind fuse block. Connect jumper wire between White/Red and Brown wires of front air bag sensor harness connector. Measure resistance between White/Red and Brown wires on front air bag sensor side of Yellow 2-pin sub-harness connector. If resistance is less than one ohm, repair or replace harness or connector between air bag sensor assembly and sub-harness connector. If resistance is more than one ohm, repair or replace harness or connector between sub-harness connector and front air bag sensor.
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