For a complete wiring diagram Refer to Section 8W.When Monitored:With the ignition on and the ABS Pump Motor deactivated, but not if supply voltage faults are detected.Or, if the control is switched off.Set Condition:If the Anti-Lock Brakes Module detects either a low voltage condition when the ABS Pump Motor is activated or deactivated or a high voltage condition when the ABS Pump Motor is deactivated.Possible CausesWIRING HARNESS, TERMINAL, CONNECTOR DAMAGEABS PUMP MOTOR FUSE OPEN(A107) FUSED B(+) CIRCUIT SHORTED TO GROUND, OPEN, OR HIGH RESISTANCE(Z127) OR (Z107) GROUND CIRCUIT OPEN, OR HIGH RESISTANCEANTI-LOCK BRAKES MODULEPUMP MOTOR (HYDRAULIC CONTROL UNIT)1. CHECK FOR A DTC C2116–ABS PUMP MOTOR SUPPLY LOW VOLTAGEThis DTC must be active for the results of this test to be valid.Turn the ignition on.With the scan tool, record and erase DTCs.Cycle the ignition switch from off to on.Road test the vehicle over 40 km/h (25 mph).Vehicle must be driven above 40 km/h (25 mph) for set conditions to be meet.With the scan tool, read DTCs.Does the scan tool display: C2116–ABS PUMP MOTOR SUPPLY LOW VOLTAGE?YesGo To 2NoPerform the ABS Intermittent Condition diagnostic procedure in this Section.Refer to the ABS-INTERMITTENT CONDITION TEST. (Refer to 5 - BRAKES - DIAGNOSIS AND TESTING) 2. INSPECT RELATED WIRING HARNESS, TERMINALS, & CONNECTORSTurn the ignition off.Visually inspect the Anti-Lock Brakes Module harness connector and wiring harness for damage.Check all related wiring for pinched, chafed, pierced, and partially broken wires.Check all related connectors for broken, bent, pushed out, and corroded terminals.Were any problems found?YesRepair as necessary.Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).NoGo To 33. CHECK ABS PUMP MOTOR FUSERemove and visually inspect the ABS Pump Motor fuse.Is the fuse open?YesGo To 4NoGo To 54. CHECK (A107) FUSED B(+) CIRCUIT FOR A SHORT TO GROUND

Disconnect the Anti-Lock Brakes Module harness connector.Measure the resistance of the (A107) Fused B(+) circuit between ground and the Anti-Lock Brakes Module harness connector.Is the resistance below 10k ohms?YesRepair the (A107) Fused B(+) circuit for a short to ground.Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).NoGo To 55. CHECK (A107) FUSED B(+) CIRCUIT FOR AN OPEN OR HIGH RESISTANCE

Replace the ABS Pump Motor fuse.Using a 12-volt test light connected to ground, probe the (A107) Fused B(+) circuit.The test light should illuminate brightly. Compare the brightness to that of a direct connection to the battery.Does the test light illuminate brightly?YesGo To 6NoRepair the (A107) Fused B(+) circuit for an open or high resistance.Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).6. CHECK (Z127) OR (Z107)GROUND CIRCUIT FOR AN OPEN OR HIGH RESISTANCE

Using a 12-volt test light connected to 12 volts, probe the (Z127) and (Z107) Ground circuit.The test light should illuminate brightly. Compare the brightness to that of a direct connection to the battery.Does the test light illuminate brightly on both circuits?YesGo To 7NoRepair (Z127) or (Z107) circuit for an open or high resistance.Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).7. REPLACE ANTI-LOCK BRAKES MODULE & VERIFY IF DTC IS STILL ACTIVEReplace the Anti-Lock Brakes Module in accordance with the Service Information.Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).Turn the ignition on.With the scan tool, read ABS DTCs.Does this DTC reset?YesReplace the Hydraulic Control Unit in accordance with the Service Information.Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).NoPerform the ABS Intermittent Condition diagnostic procedure in this Section.Refer to the ABS-INTERMITTENT CONDITION TEST. (Refer to 5 - BRAKES - DIAGNOSIS AND TESTING)