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Home >> Cadillac >> 2012 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1109 (Battery, Charging System And Starting System) >> Diagnostic Information and Procedures >> DTC B1424 >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the theft deterrent module (TDM).
  2. Ignition OFF, test for less than 1.0 ohm of resistance between the ground circuit terminal 3 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, measure the voltage between the B+ voltage circuit terminal 1 and the ground circuit terminal 3. Verify that the voltage readings do not differ more than 2 volts than battery terminal voltage.
    • If greater than the specified value, test the B+ voltage circuit for a short to ground or an open/high resistance.
  4. If the circuits test normal, replace the TDM.
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