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Home >> Cadillac >> 2013 >> SRX Performance, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 19 (Data Communication System) >> Diagnostic Information and Procedures >> DTC U0074 >> Circuit/System Testing >> Testing the Ignition Circuit
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Testing the Ignition Circuit

WARNING: This page is about a different car, the 2010 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connectors with the ignition circuits at an easily accessible control module that is not communicating.
  2. Ignition OFF, verify that a test lamp does not illuminate between each ignition circuit terminal and ground, at the control module connector that was just disconnected.
    • If the test lamp does illuminate, test the ignition circuit for a short to voltage. If the circuits test normal, replace the control module that was just disconnected.
  3. Ignition ON, verify that a test lamp illuminates between each ignition circuit terminal and ground.
    • If the circuits test normal, replace the control module that was just disconnected.
  4. Connect the harness connectors at the control module that was just disconnected.
  5. Repeat step 1 at another control module until a short to voltage, a short to ground, or an open/high resistance is found on the ignition circuits.
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