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Home >> Hummer >> 2007 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 1463 (Antilock Brake System - Non-Hybrid Less Than 3900 Kg (8600 Lb) GVW) >> Diagnostic Information and Procedures >> DTC C0299 >> Circuit/System Testing >> C0299 00

C0299 00

WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector from the power brake booster actuator.
  2. Test for less than 25k ohm of resistance between the harness connector terminal 5 and ground.
    • If greater than 25k ohm, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the actuator harness connector terminal 1 and terminal 5.
  4. Ignition ON, command the Active Brake Booster to ON and OFF with a scan tool.
    • If the test lamp remains OFF during the commands, test for a short to ground or an open/high resistance on either control circuit. If the circuits test normal, replace the electronic brake control module EBCM.
    • If the test lamp is always ON, test the control circuits for a short to battery positive. If the circuit tests normal, locate and repair the source of the vacuum leak.
  5. If all circuits test normal, test or replace the vacuum brake booster assembly.
  6. If all circuits test normal, and no vacuum leaks were found, replace the electronic brake control module (EBCM).
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