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Home >> Cadillac >> 2012 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 785 (Battery, Charging System And Starting System) >> Diagnostic Information and Procedures >> DTC B1424 >> Circuit/System Testing
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Circuit/System Testing

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  1. Ignition OFF, disconnect the theft deterrent module (TDM) harness connector.
  2. Measure and record the voltage at the battery terminals. Ignition in ON position, measure the voltage between the accessory voltage circuit and the ground circuit of the TDM. Verify that the voltage readings do not differ more than 1 volt.
    • If greater than 1 volt, test the accessory voltage circuit and the ground circuit of the TDM for an open/high resistance. If the circuits test normal, replace the TDM.
  3. Refer to Charging System Test .
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