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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 79 (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 Sienna. 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. Leave left front air bag sensor connected.
  2. Measure resistance between air bag sensor assembly connector C5, terminals No. 15 (circuit SL+, White/Red wire) and No. 26 (circuit SL-, Brown wire). See Figure. If resistance is 754-886 ohms, go to next step. If resistance is not 754-886 ohms, go to step  6.
  3. Measure resistance between ground and air bag sensor assembly connector C5, terminals No. 15 (White/Red wire). If resistance is more than one megohm, go to next step. If resistance is less than one megohm, go to step  7.
  4. Connect negative battery cable. Wait 2 seconds. Measure voltage between ground and air bag sensor assembly connector C5, terminals No. 15 (White/Red wire). If voltage is less than one volt, go to next step. If voltage is more than one volt, go to step  8.
  5. Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds. Connect left front air bag sensor. 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/B1159 is displayed, replace left front air bag sensor. If DTC 16/B1158/B1159 is not displayed, system is functioning properly at this time. Check for intermittent fault. See AIR BAG WARNING LIGHT INTERMITTENT  under DIAGNOSTIC TESTS.
  6. Disconnect left front air bag sensor connector. Measure resistance across sensor terminals. If resistance is 754-886 ohms, repair or replace harness or connector between left front air bag sensor and air bag sensor assembly. If resistance is not 754-886 ohms, replace left front air bag sensor.
  7. Disconnect left front air bag sensor connector. Measure resistance between ground and air bag sensor assembly connector C5, terminals No. 15 (White/Red wire). Measure resistance between ground and air bag sensor assembly connector C5, terminals No. 26 (Brown wire). If resistance is less than one megohm, repair or replace harness or connector between left front air bag sensor and air bag sensor assembly. If resistance is more than one megohm, replace left front air bag sensor.
  8. Disconnect left front air bag sensor connector. Measure voltage between ground and air bag sensor assembly connector C5, terminals No. 15 (White/Red wire). Measure voltage between ground and air bag sensor assembly connector C5, terminals No. 26 (Brown wire). If voltage is more than one volt, repair or replace harness or connector between left front air bag sensor and air bag sensor assembly. If voltage is less than one volt, replace left front air bag sensor.
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