LEMON Manuals: Even more car manuals for everyone
Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 269 (Air Bag Restraint Systems) >> Diagnostic Tests >> DTC 37/B1655: Left Seat Belt Switch Malfunction >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition switch to LOCK position. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Connect negative battery cable. Wait at least 2 seconds. Turn ignition switch to ON position. Wait at least 60 seconds. Clear DTCs. Turn ignition switch to LOCK position. Turn ignition switch to ON position. Wait at least 60 seconds. Retrieve DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES (DTCS)  under DIAGNOSTICS. If DTC 37/B1655 is displayed, go to next step. If DTC 37/B1655 is not displayed, check for intermittent fault. See AIR BAG WARNING LIGHT INTERMITTENT .
  2. Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds. Turn ignition switch to ON position. Wait at least 90 seconds. Ensure harness connectors are properly connected to left seat belt switch and air bag sensor assembly. If connectors are properly connected, go to next step. If connectors are not properly connected, reconnect connector and go to step  1.
  3. Access air bag sensor assembly and disconnect connectors. See AIR BAG SENSOR ASSEMBLY  under REMOVAL & INSTALLATION. Disconnect seat belt switch harness connector. Connect jumper wire between harness side of left seat belt switch connector terminal No. 1 (Green/Yellow wire, circuit DBE+) and terminal No. 3 (Gray/Green wire, circuit DBE-). See Figure. Measure resistance between harness side of air bag sensor assembly connector A30, terminals No. 10 and 18. See Figure. If resistance is less than one ohm, go to next step. If resistance is more than one ohm, repair or replace wiring harness between left seat belt switch and air bag sensor assembly. See WIRING DIAGRAMS .
  4. Remove jumper wire. Measure resistance between ground and harness side of air bag sensor assembly connector A30, terminal No. 2 (Red wire). Measure resistance between harness side of air bag sensor assembly connector A30, terminals No. 10 and 18. If resistance is more than one megohm, go to next step. If resistance is less than one megohm, repair or replace wiring harness between left seat belt switch and air bag sensor assembly.
  5. Connect negative battery cable. Wait at least 2 seconds. Turn ignition switch to ON position. Measure voltage between ground and harness side of air bag sensor assembly connector A30, terminals No. 10 and 18. If voltage is less than one volt, go to next step. If voltage is more than one volt, repair or replace wiring harness between left seat belt switch and air bag sensor assembly.
  6. Turn ignition switch to LOCK position. Disconnect negative battery cable and wait at least 90 seconds. Measure resistance between ground and harness side of air bag sensor assembly connector A30, terminals No. 10 and 18. If resistance is more than one megohm, go to next step. If resistance is less than one megohm, repair or replace wiring harness between left seat belt switch and air bag sensor assembly.
  7. Reconnect left seat belt switch and air bag sensor assembly connectors. Connect negative battery cable. Wait at least 2 seconds. Turn ignition switch to ON position. Wait at least 60 seconds. Clear DTCs. Turn ignition switch to LOCK position. Turn ignition switch to ON position. Wait at least 60 seconds. Retrieve DTCs. If DTC 37/B1655 is displayed, go to next step. If DTC 37/B1655 is not displayed, system is functioning properly at this time. Check for intermittent fault.
  8. Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds. Replace left seat belt buckle switch. See SEAT BELT BUCKLE SWITCH  under REMOVAL & INSTALLATION. Connect negative battery cable. Wait at least 2 seconds. Turn ignition switch to ON position. Wait at least 60 seconds. Clear DTCs. Turn ignition switch to LOCK position. Turn ignition switch to ON position. Wait at least 60 seconds. Retrieve DTCs. If DTC 37/B1655 is displayed, replace air bag sensor assembly. If DTC 37/B1655 is not displayed, test is complete.
scientia non olet · About LEMON Manuals