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The system relay is energized when the ignition is ON. The system relay supplies voltage to the solenoid valves and the pump motor. This voltage is referred to as the system voltage. The electronic brake control module (EBCM) controls each solenoid valve by grounding the solenoid. The EBCM controls the pump motor by grounding the control circuit. The pump serves 2 purposes: Transfers brake fluid from the brake calipers to the master cylinder reservoir during pressure decrease events. Transfers brake fluid from the master cylinder reservoir to the brake calipers during pressure increase events. Conditions for Running the DTC The ignition voltage is greater than 10.5 volts. The system relay is commanded ON. Conditions for Setting the DTC The system voltage is less than 8 volts for 0.23 seconds. Action Taken When the DTC Sets If equipped, the following actions occur: The EBCM disables the DRP/ABS/TCS/VSES for the duration of the ignition cycle. The ABS indicator turns ON. The Traction Off indicator turns ON. The DIC displays the Service Stability System message. The EBCM will also set DTC C1248. The red Brake warning indicator turns ON.

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1. Remove the headlamp fasteners. 2. Using a pry bar, gently pry in the center area of the headlamp assembly. Pry the headlamp assembly straight forward in order to unsnap the headlamp ball stud from the ball stud socket. 3. Slide the headlamp straight forward and disconnect the headlamp electrical connectors from the forward lamp wiring harness. 4. Remove the headlamp from the vehicle. INSTALLATION PROCEDURE 1. Install the headlamp to the vehicle. 2. Connect the electrical connectors. 3. Position the headlamp in order to align the locator pins with the headlamp mounting bracket. 4. Press the headlamp rearward in order to engage the ball stud with the ball stud socket. 5. Install the headlamp fasteners. NOTE: Refer to Fastener Notice in Service Precautions. Tighten Tighten the headlamp mounting fasteners to 9 N.m (80 lb in) .

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Remove switch plate with small thin bladed tool at forward retainer clip. Disconnect wire harness. Insert small thin-bladed tool between side of warning lamp/reflector and armrest base to release retaining tab. Disconnect wire connector. Remove escutcheon screw. Disconnect wire harness. Disconnect lock control lever and escutcheon. Remove two screws and pull handle (Park Avenue). Remove trim panel retaining screws. Release trim panel fasteners. Carefully feed wire harness through door. Remove trim panel. Disconnect wire connector and speaker (if equipped). Remove armrest bracket and pull handle brackets then carefully peel water deflector from inner door panel. Remove two screws from the back of the HVAC control (RH side) or headlamp switch (LH side) then remove control/switch from applique. Remove six applique nuts. Remove applique. 18. 19. 20. 21. Gently pry courtesy lamp lens and remove. Remove eight nuts. Remove carpet. Remove speaker cover.

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Tests/Procedures: Potential Causes: Tech Tips: 1. Check the operation of the security light in the dash. See if it is blinking or on solid with the key on. 2. If the security light is on, then check the wiring running up the column to the back of the tumbler for being broken. 3. This can be done with an ohmmeter hooked across the two little White wires at the connector at the base of the column. Stick the key in and see if it is getting a resistance value and then rotating the tumbler make sure that the resistance does not drop out. Broken Steering Column Wiring The security system will disable the starter.

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Steering Vibration/Shudder/Moan During Parking Maneuvers on Dry Pavement (Install Power Steering Pressure (Inlet) and/or Return (Outlet) Hose Assembly) 1995-99 Buick Riviera 1997-2001 Buick Park Avenue, Ultra 2000-2001 Buick LeSabre 2000-2001 Pontiac Bonneville steering vibration, shudder or moan noise when steering during parking maneuvers on dry pavement. Correction Install a new power steering pressure (inlet) hose assembly on the following vehicles: • 1995-98 Buick Riviera • 1997-98 Buick Park Avenue and Ultra Install a new power steering pressure (inlet) and return (outlet) hose assembly on the following vehicles: • 1999 Buick Riviera • 1999-2001 Buick Park Avenue and Ultra • 2000-2001 Buick LeSabre • 2000-2001 Pontiac Bonneville 1. Verify that the power steering pump reservoir is full. • If fluid level is low, fill and check for leaks. • If power steering system has air in the system, perform the “Bleeding Air from Power Steering System” procedure as described in the Power Steering System sub-section of the Service Manual. Important: When performing the “Bleeding Air from Power Steering System” procedure, it is important that the front of the vehicle is supported by the lower control arms. If the vehicle is not supported by the lower control arms, the procedure may cause the strut bushing to dislocate and cause new concern. Verify that the accessory drive belt is in good condition and that the pulleys are not bent or damaged. Verify proper belt tension and operation of the belt tensioner. Check for power steering hose ground out conditions. Check for good engine idle and correct engine RPM. Check to see that the rear transaxle mount does not have a plastic assembly aid installed which is used 2. 3. 4. 5. 6.