For a complete wiring diagram Refer to Section 8W.When Monitored:When the ABS Pump Motor is activated.Set Condition:The ABM detects low pump motor feedback voltage with actuation of the pump motor relay.Possible CausesBLOWN PUMP FUSEWIRING HARNESS, TERMINAL, CONNECTOR DAMAGEHIGH RESISTANCE IN B+ CIRCUITSHIGH RESISTANCE IN GROUND CIRCUITSINTEGRATED CONTROL UNIT1. CHECK FOR A DTC C1073-ABS PUMP MOTOR CONTROL CIRCUITThis 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 met.With the scan tool, read DTCsThe Anti-Lock Brake Module must sense ALL 4 wheels at 12 km/h (7.5 mph) before it will extinguish the ABS indicators.Does the scan tool display: C1073-ABS PUMP MOTOR CONTROL CIRCUIT?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. INSPECT RELATED WIRING HARNESS, TERMINALS, & CONNECTORSTurn the ignition off.Visually inspect the related wiring harness. Look for any pinched, chafed, pierced, and partially broken wires.Visually inspect the related wiring harness connectors. Look 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 THE ABS PUMP MOTOR FUSED B+ FOR AN OPENTurn the ignition off.Remove and visually inspect the ABS Pump Motor B+ fuse.Is the ABS Pump Motor B+ fuse open?YesGo To 4NoGo To 64. CHECK THE (A107) FUSED B(+) FOR A SHORT TO GROUND

Turn the ignition off.Disconnect the Anti-Lock Brake Module harness connector.Using a 12–volt test light connected to 12–volts, probe the (A107) Fused B+ circuit.Does the test light illuminate brightly?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 THE (A107) FUSED B(+) CIRCUITTurn the ignition off.Visually inspect the (A107) Fused B(+) circuit in the wiring harness.Look for any signs of intermittent short to ground.Is the wiring harness OK?YesGo To 6NoRepair the (A107) Fused B(+) circuit for a short to ground.Perform ABS VERIFICATION TEST.(Refer to 5 - BRAKES - STANDARD PROCEDURE).6. CHECK THE VOLTAGE ON THE (A107) FUSED B(+) CIRCUITTurn the ignition off.Disconnect the Anti-Lock Brake Module harness connector.Measure the voltage of the (A107) Fused B(+) circuit in the Anti-Lock Brake Module harness connector.Is the voltage above 10 volts?YesGo To 7NoRepair the (A107) Fused B(+) circuit for an open.Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).7. CHECK THE (Z907) AND (Z917) GROUND CIRCUITS FOR AN OPENMeasure the resistance of the (Z907) and (Z917) Ground circuits between the Anti-Lock Brake Module harness connector and groundIs the resistance below 5.0 ohms?YesReplace the ICU per service information.Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).NoRepair the high resistance in the affected circuit.Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).