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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.

Body Control Module Voltage Out Of Range

  1. Ignition OFF, disconnect the harness connectors X1, and X2 at the body control module.
  2. Ignition ON, verify that a test lamp illuminates between the following terminals and ground.
    • X1 terminal 46
    • X1 terminal 50
    • X1 terminal 51
    • X1 terminal 52
    • X2 terminal 49
    • If the test lamp does not illuminate, repair the appropriate battery voltage circuit for an open/high resistance.
  3. Ignition OFF, test for greater than 1.0 ohm of resistance between the following terminals and ground.
    • X1 terminal 17
    • X1 terminal 19
    • X1 terminal 20
    • X2 terminal 50
    • If less than 1.0 ohm, test the appropriate ground circuit for an open/high resistance.
  4. If all circuits test normal, test or replace the BCM.

Engine Control Module/Powertrain Control Module Voltage Out Of Range

  1. Ignition OFF, disconnect the harness connectors X1 or X2 at the ECM/PCM.
  2. Ignition ON, verify that a test lamp illuminates between the following terminals and ground.
    • X1 terminal 20 (3.8L engine)
    • X2 terminal 36 (2.8L, 3.0L, 3.2L, and 3.6L engines)
    • If the test lamp does not illuminate, repair the appropriate battery voltage circuit for an open/high resistance.
  3. Ignition OFF, test for greater than 1.0 ohm of resistance between the following terminals and ground.
    • X2 terminal 73 (3.8L engine)
    • X2 terminal 58 (2.8L, 3.0L, 3.2L, and 3.6L engines)
    • If less than 1.0 ohm, test the ground circuit for an open/high resistance.
  4. If all circuits test normal, test or replace the ECM/PCM.

Instrument Panel Cluster Voltage Out Of Range

  1. Ignition OFF, disconnect the harness connectors at the instrument panel cluster.
  2. Ignition ON, verify that a test lamp illuminates between terminal 12 and ground.
    • If the test lamp does not illuminate, repair the appropriate battery voltage circuit for an open/high resistance.
  3. Ignition OFF, test for greater than 1.0 ohm of resistance between terminal 1 and ground.
    • If less than 1.0 ohm, test the ground circuit for an open/high resistance.
  4. If all circuits test normal, test or replace the IPC.
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