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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 harness connector at the EBCM.
  2. Ignition OFF, test for less than 1.0 ohm of resistance between the ground circuit terminals E and F to ground.
    • If greater than the specified range, test the ground circuits for an open/high resistance.
  3. Ignition ON, measure between the Battery Positive Voltage circuit terminals A, B and C and the ground circuit terminals E and F. The readings should not differ by more than 2 volts than the battery terminal voltage.
    • If greater than the specified value, test the Battery Positive Voltage circuits for a short to ground or an open/high resistance.
  4. If the circuit tests nor mal, replace the EBCM.
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