Pinpoint Test Q: The Anti-Lock Brake System (ABS) Warning Indicator Is Never/Always On: Testing

Q1 VERIFY THE OPERATION OF THE ABS
- Road test the vehicle and verify the ABS is functioning correctly.
- Is the ABS functioning correctly?
- Yes : GO to Q2.
- No : REFER to ANTI-LOCK CONTROL to continue diagnosis of the ABS system.
Q2 CARRY OUT THE INSTRUMENT CLUSTER WARNING LAMPS AND CHIME ACTIVE COMMAND USING THE DIAGNOSTIC TOOL
- Key in ON position.
- Enter the following diagnostic mode on the scan tool: Instrument Cluster Active Command.
  Select the instrument cluster warning lamps and chime active command. Trigger the all lamps active command on and off. Observe the ABS warning indicator.
- Does the ABS warning indicator illuminate when triggered on and turn off when triggered off?
- Yes : GO to Q3.
- No : GO to Q4.
Q3 CHECK FOR CORRECT ABS MODULE OPERATION
- Disconnect the ABS module connector.
- Check for:
  - corrosion
  - pushed-out pins
- Connect the ABS module connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes : INSTALL a new ABS module. REFER to ANTI-LOCK CONTROL . TEST the system for normal operation.
- No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
Q4 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
- Disconnect the instrument cluster connector.
- Check for:
  - corrosion
  - pushed-out pins
- Connect the instrument cluster connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes : INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER . TEST the system for normal operation.
- No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.