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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X4 harness connector at the radio.
  2. Ignition ON, verify that a test lamp does not illuminate between the vehicle speed sensor signal circuit terminal 15 and ground.
    • If the test lamp illuminates, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  3. Ignition OFF, verify that a test lamp illuminates between the vehicle speed sensor signal circuit terminal 15 and B+.
    • If the test lamp does not illuminate, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  4. Ignition OFF, disconnect the X1 harness connector at the ECM.
  5. Ignition OFF, verify that a test lamp does not illuminate between the vehicle speed sensor signal circuit terminal and B+.
    • If the test lamp illuminates, test the signal circuit for a short to ground.
  6. If all circuits test normal, replace the radio.
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