For a complete wiring diagram Refer to Section 8W.When Monitored:With the ignition on.Set Condition:When the Anti-Lock Brake Module detects periodic drops of a Wheel Speed Sensor (WSS) signal.Possible CausesDIRTY TONE WHEEL/SENSORRIGHT REAR TONE WHEEL/BEARING DAMAGE1. CHECK FOR A DTC C1044-RIGHT REAR TONE WHEEL PERFORMANCEThis DTC must be active for the results of this test to be valid.Turn the ignition on.With the scan tool, read DTCs.Record DTC and Freeze Frame information.With the scan tool, erase DTCs.Cycle the ignition switch off then on.Ensure brake capability is available before road testing.Test drive the vehicle in a straight line to 40 km/h (25 mph).Vehicle must be driven above 40 km/h (25 mph) for set conditions to be met.With the scan tool, read DTCs.Does the scan tool display: C1044-RIGHT REAR TONE WHEEL PERFORMANCE?YesGo To 2 NoRefer to the INTERMITTENT CONDITION diagnostic procedure.Refer to the ABS-INTERMITTENT CONDITION TEST. (Refer to 5 - BRAKES - DIAGNOSIS AND TESTING) 2. CHECK THE RIGHT REAR TONE WHEEL FOR DAMAGECheck the tone wheel teeth for missing teeth, cracks, or looseness. Teeth should be perfectly square, not bent, or nicked.Check the Right Rear Tone Wheel for damage.Check the Right Rear Tone Wheel for dirt.Was the tone wheel dirty?YesClean tone wheel and sensor. Clear codes and retest.Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).NoReplace the Right Rear Tone Wheel in accordance with the Service Information.Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).