Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. Perform any Service Bulletins that may apply.
2. Turn the ignition on.
3. With the scan tool, read ABS DTCs and record on the repair order.
4. Cycle the ignition from off to on.
5. Press and hold the brake pedal.
6. Push the EPB Switch down to release the Electric Parking Brakes.
7. Push the EPB Switch up to set the Electric Parking Brakes.
8. Push the EPB Switch down to release the Electric Parking Brakes.
9. Release the brake pedal.
10. Cycle the ignition from off to on.
11. With the scan tool, read ABS DTCs.
  Did the DTC return?
  
  Yes
  - Go To 2
  No
  - The conditions that caused this code to set are not present at this time. Using the appropriate SYSTEM WIRING DIAGRAM/schematic as a guide, inspect the wiring harness and electrical connectors.
  - Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
CHECK CONNECTIONS ON THE HANDBRAKE ENGAGEMENT BUTTON AND ABS CONTROL UNIT
1. Check for loose, damaged or corroded connections on the hand brake engagement button or on the ABS control unit.
  Are there any loose or damaged connections?
  
  Yes
  - Repair the wiring connections as necessary.
  No
  - Go to Step Refer to 3.
CHECK WIRING BETWEEN THE HANDBRAKE ENGAGEMENT BUTTON AND ABS CONTROL UNIT
1. Check for a short circuit to battery voltage in the wiring between the handbrake engagement button and PIN 38 of connector A of the ABS control unit.
  Is there a short circuit to battery in the wiring?
  
  Yes
  - Repair the wiring and connections as necessary insulation to the battery.
  No
  - The wiring or poor connection problem has been repaired.
  - Perform ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .