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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 76 (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 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. 9 (circuit SR+, Black/White wire) and No. 20 (circuit SR-, Brown/White 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. 9 (circuit SR+, Black/White wire) and No. 20 (circuit SR-, Brown/White 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. 9 (circuit SR+, Black/White wire) and No. 20 (circuit SR-, Brown/White 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 Black/White and Brown/White wires of right front air bag sensor harness connector (sensor connector). Measure resistance between air bag sensor assembly connector A18 terminals No. 9 (circuit SR+, Black/White wire) and No. 20 (circuit SR-, Brown/White 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 right front air bag sensor assembly terminals. If resistance is between 300-1500 ohms, go to next step. If resistance is not between 300-1500 ohms, replace right front air bag sensor assembly.
  7. Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds. Connect right 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 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 under right side of instrument panel behind kick panel. Measure voltage between ground and Black/White and Brown/White wires of right 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 right front air bag sensor and Yellow 4-pin sub-harness connector.
  9. Disconnect right 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 Black/White and Brown/White wires of right 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 right front air bag sensor and Yellow 4-pin sub-harness connector.
  10. Disconnect right 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 Black/White and Brown/White wires of right 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 right front air bag sensor and Yellow 4-pin sub-harness connector.
  11. Disconnect right 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 Black/White and Brown/White wires of right front air bag sensor sub harness connector (sensor connector). Measure resistance between Black/White and Brown/White wires of right 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 right 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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