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Condition Some customers may comment on ABS activation at low speeds, usually below 8 km/h (5 mph). Upon investigation, the technician will find no DTCs set. Cause The cause of this condition may be an increased air gap between the wheel speed sensor and the hub reluctor ring due to rust and debris built up on the sensor mounting surface. Correction Measure AC voltage and clean the wheel speed sensor mounting surfaces. 1. 2. 3. 4. Raise and support the vehicle. Disconnect both the front wheel speed sensor connectors at the frame and harness. Place a Digital Volt Meter (DVM) across the terminals of each wheel speed sensor connector. Rotate the wheel clockwise approximately one revolution per second. The minimum reading should be at least 350 ACmV’s. If the reading is less than 350 ACmV’s, remove the wheel speed sensor. 5. Plug the wheel speed sensor bore in order to prevent debris from falling into the hub during service. 6. Clean the wheel speed sensor mounting surface using a wire brush, sand paper, emery cloth, scotch brite, or other suitable material. Be sure to thoroughly clean the wheel speed sensor surface. There should be no rust or corrosion. 7. Check the sensor head to determine if it has been warped/distorted due to the corrosion build up or other causes. Check the mounting surface on the sensor head for flatness by placing it on the edge of a metal machinists scale or other suitable straight edge to measure the flatness. Check the sensor for flatness in multiple (minimum 3) positions/directions. If the sensor head is distorted, replace the sensor. 8. Apply (spray) two thin coats of the specified rust penetrating lubricant (corrosion inhibitor) to the complete sensor mounting surface on the bearing hub. Allow to dry for 3-5 minutes between coats. Use ONLY Rust Penetrating Lubricant, P/N 89022217 (in Canada, P/N 89022218). 9. When the corrosion inhibitor is dry to the touch (about 10 minutes), apply a thin layer of bearing grease to the hub surface and sensor O-ring prior to sensor installation. Use ONLY Wheel Bearing Lubricant, P/N 01051344 (in Canada, P/N 993037). 10.Install either the original sensor or a new one in the hub. Ensure that the sensor is seated flush against the hub. Refer to the applicable Wheel Speed Sensor Replacement procedure in the ABS sub-section of the Service Manual. 11.Place the DVM across the sensor terminals and recheck the voltage while rotating the wheel. The voltage should now read at least 350 ACmV’s.

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On some 2003 model year Cadillac Escalade, Escalade EXT, and Escalade ESV; Chevrolet Silverado, Avalanche, Tahoe, and Suburban; GMC Sierra, Yukon, and Yukon XL; and HUMMER H2 vehicles, the passenger door module (PDM) may become inoperative. An inoperative PDM would cause loss of function for the remote keyless entry, front passenger power window, lock, mirror and heated seat functions. Correction Dealers are to reprogram the PDM. Service Procedure Important: The labor time for performing the refresh/reprogram of the passenger door module in this recall is different than the amount of time allowed in Service Bulletin 03-08-52-001B. The labor operation code and time allowance in the service bulletin was for a BCM reprogram, and was not the correct labor operation code for this repair. Inspection Procedure Important: The following inspection must be performed in order to determine the correct repair procedure. 1. Turn the ignition to the ON position. 2. Using the switches in the right front passenger door, verify that the power window and power door lock located in that door, function properly. • If the power window and door locks do NOT function, proceed to the “Refresh and Reprogram” procedure and follow ALL of the steps. • If the power window and door lock function properly, the vehicle only needs to be updated with the new calibration for the passenger door module. Proceed to and follow only steps 4-6 in the “Refresh and Reprogram” procedure. DO NOT PERFORM STEPS 1-3. Refresh and Reprogram Procedure

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Condition Some customers of 1999-2002 Chevrolet Malibu, Oldsmobile Alero, Pontiac Grand Am, and 1999 Oldsmobile Cutlass may have turn signal/hazard flashers that become inoperative.Service Procedure The following procedure provides instructions for replacing the hazard warning switch located in the instrument panel (I/P). For additional information, refer to the Lighting subsection in the Body and Accessories section of the appropriate Service Manual or SI. Malibu 1. Remove the cover from the left side instrument panel (I/P) wiring harness junction block access panel. 2. Remove the AIR BAG fuse from the panel. 3. Remove the three screws attaching the lower steering column cover to the steering column. 4. Remove the upper steering column cover. 5. Remove the two screws that attach the IP cluster bezel to the IP. 6. Using a small flat-blade screwdriver, gently pry out and remove the IP cluster trim plate from the IP. 7. Disconnect the electrical connectors from the other switches in the trim plate. 8. Disconnect the electrical connector from the hazard warning switch. 9. Using a small flat-blade screwdriver, carefully push in on the tabs to release the hazard warning switch from the IP cluster trim plate. 10. Remove the hazard warning switch by pushing in an outward motion on the switch while holding onto the IP cluster trim plate. 11. Install the new hazard warning switch by pushing in an inward motion on the switch while holding onto the IP cluster trim plate. Push inward on the switch until it is fully seated into the IP cluster trim plate. 12. Connect the electrical connector to the hazard warning switch. 13. Connect the electrical connectors to the other switches in the trim plate. 14. Position and align the IP cluster trim plate to the IP and carefully press into place.

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If you encounter vehicles that exhibit the above conditions, refer to SI for the appropriate DTC(s) set. If no trouble is found, the cause may be due to an ECM ground terminal that has corroded with rust over time. Inspect the main engine wiring harness ground terminal (G103) for this condition. The wire terminal (G103) attaches either to the front or to the rear of the right side cylinder head, depending on the model year of the Full Size Pickup and/or Utility Trucks. If the ECM ground terminal has been found to be corroded, then follow the service procedure outlined in this bulletin to correct the corrosion issue. 1. Remove either the nut or bolt securing the main engine wiring harness ground terminal (G103) to the right cylinder head. Refer to the above illustration to determine where the ground is located on the vehicle (1). 2. Remove all rust from the ground terminal, the cylinder head and the retaining nut or bolt. 3. Position the main engine wiring harness ground terminal and install the nut or bolt. Tighten:: Tighten the retaining nut or bolt to 16 N.m (12 lb ft). 4. Apply some type of electrical moisture sealant to protect the harness terminal from further corrosion.

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1. Disconnect the electrical connector (3). 2. Remove the blower motor resistor mounting screws (1). 3. Remove the blower motor resistor (2) from the blower case. 2. Install the blower motor resistor mounting screws (1). Tighten Tighten the screws to 1.9 N.m (17 lb in). 3. Connect the electrical connector (3). Removal Procedure (C60) 1. 2. 3. 4. 5. Remove the A/C control relay bracket with the relay. Remove the blower resistor harness. Remove the stud from the IP, if necessary. Remove the blower motor resistor mounting screw. Cut the access cover from the case. Cut all four sides of the cover in order to remove the three attaching screws. Use a sharp utility knife in order to cut the case. Make the cuts straight and clean. The access cover must be reinstalled and is visible to the customer.