GMC 88891017 Antenna Asm,Radio Power

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Remove the steel mast from the antenna base. Raise the car, remove the inner fender clips and escutcheon nut, then take out the antenna base. Check the grommet for damage and replace it if necessary. Slide in the new antenna with its lead, fix the escutcheon nut, and reattach the inner fender parts. Lower the vehicle, tighten mounting bolts, and secure the antenna mast. Seal the cowl attachment point with RTV, attach the new lead-in, reconnect the pigtail, and reassemble the grille and molding.

Disconnect the negative battery cable. Remove the panel sound absorber pad and unplug the antenna connections. Tape the rear edge of the fender and door, then remove fender screws. Elevate and secure the vehicle, remove the front wheel, rocker panel screws, splash shield, and upper antenna nut using the right tool. Remove the antenna. To install, position the antenna, loosely set gasket and nut. Tighten using appropriate tools. Reassemble in reverse order, applying silicone grease to connectors. Ensure antenna mast works. Reset radio and clock as needed. From the trunk, remove trim panel, antenna bracket screws, upper antenna nut, and lead-in cable. Reinstall, connect the lead-in, secure with screws, and apply silicone grease. Confirm antenna function and reset devices.

To replace a power antenna, start by lowering the antenna mast fully by turning off the radio or ignition key switch. If the unit has failed with the antenna mast in the 'Up' position, it may be advisable to cut off the mast portion to make replacement easier. Next, disconnect the negative battery cable. Access to the power antenna motor is through the inner fender panel, so raise the vehicle and remove the front tire if necessary for better access. Remove the fender skirt attaching screws and pull the splash shield forward to gain access to the antenna connections, using a piece of 2 x 4 lumber as a spacer to keep the shield pulled away. Remove the escutcheon nut and spacer at the fender, then disconnect the electrical leads and remove the antenna and motor assembly through the fender skirt opening. When installing a new unit, make sure the mast is fully retracted and the lower bracket is securely attached to the body.

To install the new antenna, insert the cable lead into the fender wheel and route it towards the radio, attaching it to the back of the radio. Screw the antenna mast into the fender and check its operation.

Disconnect the negative battery cable.

For power antenna installation inside the fender, disconnect the negative battery cable and remove the instrument panel sound absorber pad. Disconnect the antenna lead-in and harness connector from the relay assembly. Apply masking tape to the rear edge of the fender and door. If necessary, remove the inner to outer fender retaining screws and the front wheel assembly. Remove the lower rocker panel and inner splash shield from the fender, as required. Remove the upper antenna retaining nut and the antenna to bracket retaining bolts, then remove the antenna. To install the power antenna, fit it into position and loosely install the antenna gasket and upper nut. Loosely install the antenna to bracket retaining bolts and tighten the upper antenna retaining nut and the antenna to bracket retaining bolts. Complete the installation in reverse order and apply silicone grease to the harness connector before reconnecting the negative battery cable.

Raise the vehicle and support it safely, then remove the associated front wheel assembly.

Raise and support the car to remove the inner fender clips and screws, pull back the inner fender strip and remove the escutcheon nut, and inspect the grommet in the fender wheel for cracks or distortion of any kind.

Remove the fender skirt attaching screws and pull down on the rear edge of the skirt, using a 2x4-inch lumber as a spacer to keep it pulled away.