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Trim Panel Replacement – Side Rear Door Tools Required J 36796 Clip Zip Clip Removal Tool or J 38778 Door Trim Pad Clip Remover Removal Procedure 1. Position the window fully downward. 2. Ensure the manual lock knob (1) is in the unlock position. 3. Insert a flat bladed tool into the top service notch in order to disengage the locking clip (2) located at the front of the manual lock knob (1). 4. Remove the manual lock knob (1). 5. Remove the inside handle bezel from the inner door panel in the following order: 1. 2. 3. 4. Hold the inside handle to the open position. Insert a flat bladed tool at the front lower corner of the bezel. Pry outward on the bezel. Remove the bezel from the inner door panel. 6. Remove the screw attaching the inside door handle to the sheet metal. 7. Use the J 36796 or J 38778 in order to release the eight retainers (1) around the outside edges of the door trim panel. 8. Slide the door trim panel (1) upwards to release it from the following: The alignment datums (4) The eight retainers The arm rest steel retainer clips (3) The inner belt molding (2) 9. Disconnect the door trim panel electrical connector. Installation Procedure 1. Position the manual lock rod (1) vertically into the bell crank retainer clip (2).

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1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information. 2. Remove the tire and wheel. Refer to Tire and Wheel Removal and Installation in Tires and Wheels. 3. Remove the shock module yoke. Refer to Shock Module Yoke Replacement. 4. Remove the stabilizer shaft link lower retaining nut. 5. Remove the stabilizer shaft link from the lower control arm. 6. Remove the ABS wire harness from the lower control arm. 7. Remove the lower control arm to steering knuckle nut. 8. Using the J 43631 , separate the lower control arm from the steering knuckle. See Special Tools. IMPORTANT: Will need to raise the power steering gear to have clearance when removing the rear lower control arm to frame retaining bolt. 9. Loosen the power steering gear retaining bolts and raise the power steering gear. 10. Remove the lower control arm to cradle nuts. 11. Remove the lower control arm to cradle bolts. 12. Remove the lower control arm by lowering the lower control arm at the frame and moving the ball stud upwards. Installation Procedure

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Customer Concern: Tests/Procedures: Potential Causes: Tech Tips: Code C0660 will reset. 1. Check the RTD fuse located in the underhood fuse block. 2. Check for Battery Voltage (B+) on the Orange wire at the automatic level control air compressor pin F. 3. If less than B+ at pin F, check for a wiring and connection problem between the air compressor and the underhood fuse block. 4. Disconnect the compressor leveling module connector and check the resistance from the positive battery voltage circuit of the exhaust solenoid valve and the control circuit of the exhaust solenoid valve. Should be 30-90 ohms. 5. Check for B+ on the Dark Blue wire pin B at the air compressor with the exhaust solenoid commanded off. 6. Check for B+ at the Electronic Suspension Control module connector C2 pin B5 Dark Blue wire with the exhaust solenoid commanded off. 7. If there is B+ at the air compressor but not at the electronic suspension control, check for a wiring and connection problem between the air compressor and the electronic suspension control module. Air Suspension Compressor Vent Solenoid Electronic Suspension Control Ground Power Wiring Conditions for Setting the DTC C0660 • An open in the control circuit of the exhaust solenoid valve • A short to ground in the control circuit of the exhaust solenoid valve • A short to battery in the control circuit of the exhaust solenoid valve • An open in the battery positive voltage circuit of the exhaust solenoid valve • An open RTD fuse • A malfunctioning exhaust solenoid valve

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Condition Some customers may comment on an engine valve lifter tick noise that occurs after the engine has been shut off for at least two hours. The tick noise may last from two seconds to ten minutes. Cause This condition may be caused by any of the following: • Aerated oil in the valve lifter body, resulting in the valve lifter being unable to purge the air quickly. • A low engine oil level or incorrect oil viscosity. • Dirty or contaminated oil. • A low internal valve lifter oil reservoir level. • Debris in the valve lifter. • A high valve lifter leak down rate. Correction If the SI diagnostics do not isolate the cause of this valve lifter tick noise and normal oil pressure is noted during the concern, perform the following steps: 1. Inspect the engine oil condition and level. Refer to Owner Manual > Service and Appearance Care > Checking Things Under the Hood > Description and Operation > Engine Oil in SI. ? If the engine oil is more than one quart low, an incorrect oil viscosity is being used or if poor quality/contamination is observed, change the oil and filter. Note: Allow at least a two hour soak time between engine OFF and start up when evaluating the tick noise. 2. Start the engine and evaluate the valve lifter tick noise. ? If the valve lifter tick noise is still present, replace all 16 valve lifters. Refer to Valve Lifter Replacement in SI.

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Some of the above vehicles may exhibit an engine knock noise that begins in the first 19,000-24,000 km (12,000-15,000 mi) of use. The knock noise is most often noticed during initial start- up and typically disappears within the first 5-30 seconds (may last longer in extreme cold temperatures). The noise is usually more noticeable on the initial start-up when the temperature is below 10°C (50°F) and may be more pronounced on the first cold start following a long trip. This noise may be caused by an interaction between carbon that has formed on the piston, the piston motion and the cylinder wall. GM Powertrain Engineering, and an analysis of engines with this condition, has confirmed that the noise is not detrimental to the performance, reliability or durability of the engine. THIS NOISE DOES NOT HAVE ANY EFFECT ON THE LONGEVITY OF ANY OF THE ENGINE COMPONENTS. Important: At this time, attempts to repair this condition by replacing the engine assembly or pistons are not recommended. Please share the information found in this bulletin with customers who inquire about this condition. In the event they have additional questions or concerns, please advise your Area Service Manager.