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Home >> Buick >> 2007 >> Allure CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 62 (Wiring Systems And Power Management - DTC B1370 To DTC B1475) >> DTC B1385 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector X2 of the ignition switch.
  2. Verify that a test lamp illuminates between the 12 volt reference terminal A and ground.
    • If the test lamp does not illuminate, test the 12 volt reference circuit for a short to ground or an open/high resistance, and test the crank voltage circuit for a short to ground. If the circuits test normal, replace the BCM.
  3. Disconnect harness connector X1 of the BCM. Connect the harness connector of the ignition switch.
  4. Test for less then 1 ohm of resistance between the 12 volt reference circuit terminal 25 and crank voltage terminal 21 with the ignition switch in the START position.
    • If greater than the specified range, test the crank voltage circuit for open/high resistance. If the circuit tests normal, test or replace the ignition switch.
  5. Connect a 3 amp fused jumper between B+ and the 12 volt reference circuit terminal 25 of BCM harness connector X1.
  6. With the ignition switch in the OFF, ACCY and RUN positions, test for less than 1 volt between crank voltage circuit terminal 21 of BCM connector X1 and ground.
    • If greater than the specified range in either position, test the crank voltage circuit for a short to voltage. If the circuit tests normal, test or replace the ignition switch.
  7. If all circuits test normal, test or replace the BCM.
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