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Home >> Cadillac >> 2007 >> STS Base, 4.6 A, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 64 (Data Communication System) >> Diagnostic Information and Procedures >> DTC U2099 >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac SRX. 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. Retest for current DTCs. DTC U2099 should remain current.
    • If the DTC becomes history, replace the EBCM.
  3. Ignition OFF, disconnect the harness connector at the BCM.
  4. Test for infinite resistance between the serial data communication enable circuit and ground.
    • If less than infinite resistance, repair the enable circuit for a short to ground.
  5. If all tests normal, replace the BCM.
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