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Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Toyota Matrix and 2004 Toyota Corolla. 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. Access left front air bag sensor and disconnect harness connector. See FRONT AIR BAG SENSOR  under REMOVAL & INSTALLATION. Access air bag sensor assembly and disconnect harness connector A13. See AIR BAG SENSOR ASSEMBLY  under REMOVAL & INSTALLATION. Connect negative battery cable. Wait 2 seconds. Turn ignition switch to ON position. Measure voltage between ground and air bag sensor assembly connector A13, terminal No. 15 (circuit SR+, White/Red wire). See Figure. Measure voltage between ground and air bag sensor assembly connector A13, terminal No. 26 (circuit SR-, Brown wire). If voltage is less than one volt, go to next step. If voltage is more than one volt, go to step  6.
  2. Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds. Measure resistance between ground and air bag sensor assembly connector A13, terminals No. 15 (White/Red wire) and No. 26 (Brown wire). If resistance is more than one megohm in both circuits, go to next step. If resistance is less than one megohm, go to step  7.
  3. Connect jumper wire between White/Red and Brown wires on harness side of left front air bag sensor connector. Measure resistance between air bag sensor assembly connector A13, terminals No. 15 and 26. If resistance is less than one ohm, go to next step. If resistance is more than one ohm, go to step  8.
  4. Measure resistance between component side of left front air bag sensor connector terminals. If resistance is 820 ohms, go to next step. If resistance is not 820 ohms, replace left front air bag sensor.
  5. 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 A13. 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/B1158 or B1159 is displayed, replace air bag sensor assembly. If DTC 15/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.
  6. Disconnect left front air bag sensor Yellow 4-pin sub-harness connector IA1. Connector IA1 is located under left side of instrument panel near junction block. Measure voltage between air bag sensor assembly side of sub-harness connector IA1, terminal No. 3 (White/Red wire) and No. 4 (Brown wire). See Figure. If voltage is more than one volt, repair or replace engine compartment main wire harness or connector. If voltage is less than one volt, repair or replace wire harness or connector between sub-harness connector IA1 and air bag sensor assembly.
  7. Disconnect left front air bag sensor Yellow 4-pin sub-harness connector IA1. Connector IA1 is located under left side of instrument panel near junction block. Measure resistance between air bag sensor assembly side of sub-harness connector IA1, terminal No. 3 (White/Red wire) and No. 4 (Brown wire). See Figure. If resistance is less than one megohm, repair or replace engine compartment main wire harness or connector. If resistance is more than one megohm, repair or replace wire harness or connector between sub-harness connector IA1 and air bag sensor assembly.
  8. Disconnect left front air bag sensor Yellow 4-pin sub-harness connector IA1. Connector IA1 is located under left side of instrument panel near junction block. Connect jumper wire between Black/white and Brown wires on harness side of left front air bag sensor connector. Measure resistance between air bag sensor assembly side of sub-harness connector IA1, terminal No. 3 (White/Red wire) and No. 4 (Brown wire). See Figure. If resistance is less than one ohm, repair or replace engine compartment main wire harness or connector. If resistance is more than one ohm, repair or replace wire harness or connector between sub-harness connector IA1 and air bag sensor assembly.
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