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Home >> Cadillac >> 2011 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 990 (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 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. With the ignition OFF, disconnect the X 1 harness connector at the EBCM, DSCC, and ESC 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 X 3 at the BCM.
  3. With the X 1 harness connector at the EBCM, DSCC, and ESC modules disconnected, test for infinite resistance between the high speed GMLAN serial data wake up circuit terminal 19 and ground.
    • If less than the specified value, test the wake up circuit for a short to ground.
  4. If all circuits test normal and DTC is current, replace the BCM.
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