Diagnostic Test

VERIFY THE DTC IS ACTIVE
1. Turn the ignition on.
2. With the scan tool, read and record the ABS DTCs.
3. With the scan tool, read and record Environmental Data (EV Data).
4. With the scan tool, erase the ABS DTCs.
5. Cycle the ignition switch.
  WARNING:
  Make sure brake capability is available before road testing.
6. Test drive the vehicle by turning the vehicle left or right in a curving manner at a velocity between 10 and 20 km/h (6 and 12 mph).
7. Park the vehicle.
8. With the scan tool, read the ABS DTCs.
  Is the DTC active at this time?
  
  Yes
  - Go To 2.
  No
  - Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION .
CHECK THE STOP LAMP SWITCH INSTALLATION
1. Turn the ignition off.
2. Inspect the Stop lamp Switch to make sure it is properly installed.
3. Check all related connectors for broken, bent, pushed out, or corroded terminals.
4. Check the Stop lamp Switch to make sure it is returning to the proper position.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  No
  - Go To 3.
STOP LAMP SWITCH OPERATION
1. Turn the ignition on.
2. With the scan tool, observe the PRIMARY BRAKE SWITCH status.
3. Press the brake pedal.
4. Release the brake pedal.
  Is the brake pedal switch status operating correctly?
  
  Yes
  - Replace the Stop Lamp Switch in accordance with the Service Information. Refer to SWITCH, STOP LAMP, REMOVAL .
  - Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  No
  - Replace the Anti-Lock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .
  - Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .