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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the TDM.
  2. Probe the ground circuit terminal 3 with a test lamp that is connected to B+. The test lamp should illuminate.
    • If the test lamp does not illuminate, then test the ground circuit for an open/high resistance.
  3. Ignition ON. measure the voltage between the B+ circuit terminal 1 and the ground circuit terminal 3. Verify that the difference between the voltage at the TDM connector and the voltage at the battery terminals is less than 1 volt.
    • If greater than the specified value, test the B+ circuit for a short to ground or an open/high resistance.
  4. If all circuits test normal, replace the TDM.
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