Diagnostic Test

VERIFY THE DTC IS ACTIVE
NOTE:
If any other DTCs present, repair them before continuing with this procedure.

NOTE:
Make sure the battery is fully charged.
1. Ignition on, engine not running.
2. With the scan tool, record and erase DTCs.
3. Turn ignition off to the lock position.
4. Start the engine.
5. With the scan tool, read 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 FUSE
1. Ignition on, engine not running.
2. Using a 12-volt test light connected to ground, check the fuse for power.
  Is the fuse good?
  
  Yes
  - Go To 3
  No
  - If the related fuse is open, check the (A921) Fused B(+) circuits for a short to ground.
  - Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
POWER CIRCUITS FOR AN OPEN OR HIGH RESISTANCE
1. Turn ignition off to the lock position.
2. Disconnect the ABS Module harness connector.
3. Ignition on, engine not running.
4. With a 12-volt test light connected to ground, check the (A921) Fused B+ circuits at the ABS Module harness connector.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 4
  No
  - Repair the Power circuits for an open or high resistance.
  - Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
GROUND CIRCUITS OPEN OR HIGH RESISTANCE
1. Turn ignition off to the lock position.
2. With a test light connected to B+ check (Z905) Ground circuits at the ABS harness connector.
  Does the test light illuminate brightly?
  
  Yes
  - 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 .
  No
  - Repair the Ground circuits for an open or high resistance.
  - Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .