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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.
IMPORTANT: It is recommend that Component Testing is performed before Circuit Testing when diagnosing the power brake booster actuator.
  1. Ignition OFF, disconnect the harness connector from the power brake booster actuator.
  2. Test for less than 25.0 ohm of resistance between the harness connector terminal 5 and ground.
    • If greater than 25.0 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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