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Circuit/System Testing

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. With the ignition OFF, disconnect the harness connector at the EBCM, ESC module, and DSCC module one at a time. After each disconnect, retest for current DTCs. DTC U2099 should remain current.
    • If the DTC becomes history, replace the module disconnected before the DTC became history.
  2. Ignition OFF, disconnect the harness connector at the BCM.
  3. With all modules disconnected, test for infinite resistance between the high speed GMLAN serial data wake up circuit and ground.
    • If less than infinite resistance, repair the wake up circuit for a short to ground.
  4. If all tests normal and DTC is current, replace the BCM.
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