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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 75 (Air Bag Restraint Systems) >> Diagnostic Tests >> DTC 15/B1156 & B1157: Right Front Air Bag Sensor Malfunction >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Toyota Sequoia. 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.
  2. Connect negative battery cable. Turn ignition switch to ON position. Measure voltage between ground and air bag sensor assembly connector A20, terminal No. 9 (circuit SR+, Black/White wire). See Figure. Measure voltage between ground and air bag sensor assembly connector A20, terminal No. 20 (circuit SR-, Brown/White wire). If voltage in both tests is less than one volt, go to next step. If either voltage is more than one volt, go to step  8.
  3. Measure resistance between ground and air bag sensor assembly connector A20, terminal No. 9 (circuit SR+, Black/White wire). Measure resistance between ground and air bag sensor assembly connector A20, terminal No. 20 (circuit SR-, Brown/White wire). If resistance in both tests is more than one megohm, go to next step. If either resistance is less than one megohm, go to step  9.
  4. Measure resistance between air bag sensor assembly connector A20, terminals No. 9 (circuit SR+, Black/White wire) and terminal No. 20 (circuit SR-, Brown/White wire). If resistance is more than one megohm, go to next step. If is less than one megohm, go to step  10.
  5. Connect jumper wire between right front air bag sensor harness connector terminals. Measure resistance between air bag sensor assembly connector A20, terminal No. 9 (circuit SR+, Black/White wire) and terminal No. 20 (circuit SR-, Brown/White wire). If resistance is less than one ohm, go to next step. If is more than one ohm, go to step  11.
  6. Measure resistance across right front air bag sensor terminals. If resistance is 300-1500 ohms, go to next step. If resistance is not 300-1500 ohms, replace right front air bag sensor.
  7. Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds. Connect air bag sensor assembly connector A20 (center connector). Reconnect right front air bag sensor. 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 15/B1156 or B1157 is displayed, replace air bag sensor assembly. If DTC 15/B1156 or B1157 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 right front air bag sensor Yellow 4-pin sub-harness connector. Connector is located on right side of instrument panel. Measure voltage between ground and Black/White wire on front air bag sensor side of Yellow 4-pin sub-harness connector. Measure voltage between ground and Brown/White wire on front air bag sensor side of Yellow 4-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 Yellow 4-pin sub-harness connector. If voltage is more than one volt, repair or replace harness or connector between Yellow 4-pin sub-harness connector and right front air bag sensor.
  9. Disconnect right front air bag sensor Yellow 4-pin sub-harness connector. Connector is located on right side of instrument panel. Measure resistance between ground and Black/White wire on front air bag sensor side of Yellow 4-pin sub-harness connector. Measure resistance between ground and Brown/White wire on front air bag sensor side of Yellow 4-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 Yellow 4-pin sub-harness connector. If either resistance is less than one megohm, repair or replace harness or connector between Yellow 4-pin sub-harness connector and right front air bag sensor.
  10. Disconnect right front air bag sensor Yellow 4-pin sub-harness connector. Connector is located on right side of instrument panel. Measure resistance between Black/White and Brown/White wires on front air bag sensor side of Yellow 4-pin sub-harness connector. If resistance is more than one megohm, repair or replace 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 harness or connector between Yellow 4-pin sub-harness connector and right front air bag sensor.
  11. Disconnect right front air bag sensor Yellow 4-pin sub-harness connector. Connector is located on right side of instrument panel. Connect jumper wire between right front air bag sensor harness connector terminals. Measure resistance between Black/White and Brown/White wires on front air bag sensor side of Yellow 4-pin sub-harness connector. If resistance is less than one ohm, repair or replace harness or connector between air bag sensor assembly and Yellow 4-pin sub-harness connector. If resistance is more than one ohm, repair or replace harness or connector between Yellow 4-pin sub-harness connector and right front air bag sensor.
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