Normal Operation

The instrument cluster receives the ABS status from the ABS module through hardwired circuitry. When an ABS concern is present, the ABS module sends the instrument cluster a command to illuminate the ABS warning indicator. If the instrument cluster detects a fault condition in the ABS, the instrument cluster turns on the ABS warning indicator.

This pinpoint test is intended to diagnose the following:

Wiring, terminals or connectors
ABS module
Instrument cluster
CAUTION:
- Use the correct probe adapters) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

ANTI-LOCK BRAKE SYSTEM (ABS) WARNING INDICATOR PINPOINT TEST 29

PINPOINT TEST 29		THE ANTI-LOCK BRAKE SYSTEM (ABS) WARNING INDICATOR IS ALWAYS ON
STEP	INSPECTION		ACTION
1	RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND INSTRUMENT CLUSTER SELF-TESTS Check the recorded instrument cluster DTCs from the continuous and on-demand self-test. Is DTC C1221 present?	Yes	Go to step 7.
1		No	Go to next step.
2	RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND ABS MODULE SELF-TESTS Check the recorded ABS module DTCs from the continuous and on-demand self-test. Are any DTCs present?	Yes	See ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX .
2		No	Go to next step.
3	CHECK THE OPERATION OF THE BRAKE WARNING INDICATOR Key in ON position. Observe the brake warning indicator. Is the brake warning indicator illuminated?	Yes	See PINPOINT TEST 16: THE BRAKE WARNING INDICATOR IS NEVER ON to diagnose the brake warning indicator.
3		No	Go to next step.
4	CARRY OUT THE INSTRUMENT CLUSTER INDICATOR LAMP CONTROL COMMAND USING THE SCAN TOOL Enter the following information on the diagnostic scan tool: Instrument Cluster DataLogger Select the instrument cluster ABS warning indicator (ABS_LAMP) active command. Command the ABS warning indicator on and then off again. Observe the ABS warning indicator. Does the ABS warning indicator illuminate when commanded on, and turn off when commanded off?	Yes	Go to next step.
4		No	Go to step 9.
5	CHECK THE ABS WARNING INDICATOR OPERATION Key in OFF position. Disconnect: ABS Module connector 0413-102. Connect a fused (5A) jumper wire between the ABS module 0413-102 pin 17, circuit (L/O), harness side and ground. Key in ON position. Observe the ABS warning indicator. Does the ABS warning indicator turn off?	Yes	Go to step 8.
5		No	Go to next step.
6	CHECK CIRCUIT (L/O) FOR AN OPEN Key in OFF position. Disconnect: Instrument Cluster connector 0922-101. Measure the resistance between the instrument cluster 0922-101 pin 18, circuit (L/O), harness side and the ABS module 0413-102 pin 17, circuit (L/O), harness side. Is the resistance less than 5 ohms?	Yes	Go to step 9.
6		No	REPAIR the circuit. TEST the system for normal operation.
7	CHECK CIRCUIT (L/O) FOR A SHORT TO GROUND Key in OFF position. Disconnect: Instrument Cluster connector 0922-101. Disconnect: ABS Module connector 0413-102. Measure the resistance between the instrument cluster 0922-101 pin 18, circuit (L/O), harness side and ground. Is the resistance greater than 10,000 ohms?	Yes	Go to next step.
7		No	REPAIR the circuit. TEST the system for normal operation.
8	CHECK FOR CORRECT ABS MODULE OPERATION Disconnect all the ABS module connectors. Check for: corrosion damaged pins pushed-out pins Connect all the ABS module connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present?	Yes	INSTALL a new ABS module. See ANTI-LOCK BRAKE SYSTEM (ABS) MODULE . TEST the system for normal operation.
8		No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
9	CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION Disconnect all the instrument cluster connectors. Check for: corrosion damaged pins pushed-out pins Connect all the instrument cluster connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present?	Yes	INSTALL a new instrument cluster. See INSTRUMENT CLUSTER . TEST the system for normal operation.
9		No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.