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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac SRX. 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 5 and ground.
    • If the test lamp illuminates, test the signal circuit for a short to voltage. If the circuit tests normal, replace the EBCM.
  3. Ignition OFF, verify that a test lamp illuminates between the vehicle speed sensor signal circuit terminal 5 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 EBCM.
  4. Ignition OFF, disconnect the harness connector at the EBCM.
  5. Ignition OFF, verify that a test lamp does not illuminate between the vehicle speed sensor signal circuit terminal A10 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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