Cellular Communication System: Removal & Installation Chevrolet TrailBlazer I

Removal Procedure

Scheme 162

1. Disconnect the coaxial cable from the inner coupling of the mobile communication antenna (1). NOTE: If you use a razor blade or other sharp tool in order to remove the adhesives or foreign objects from the inside of the rear window, use the blade carefully. Damage to the grid lines may result. IMPORTANT: If the vehicle is equipped with diversity antennas, move the thin, wide-bladed plastic tool in the direction away from the antenna grid lines (2).
2. Use a thin, wide-bladed plastic tool to cut the double back tape material while lifting up on the inner antenna coupling.

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Scheme 166

1. Clean the inside of the back glass with alcohol wipe.
2. Dry the glass thoroughly using a lint free cloth. IMPORTANT: The adhesion promoter must be used to assure adequate bonding of the coupling. Mask or protect the surrounding area before applying the adhesion promoter.
3. Apply Glass Adhesion Promoter GM P/N 12378555 (Canadian P/N 88901239) to the back glass in the area the antenna coupling is to be installed. Follow the Glass Adhesion Promoter instructions on the product label. IMPORTANT: Ensure the inner and outer antenna couplings are aligned. Do not touch the adhesive backing on the antenna coupling.
4. Remove the protective film from the adhesive backing on the inner antenna coupling.
5. If the exterior antenna coupling is not installed, use a grease pencil on the outside glass to mark the mounting location of the interior antenna coupling. Ensure the marks are level.
6. The mounting location for the couplings is on the left quarter window, 100 mm (4 in) (A) rearward of the black masking (1), and 48 mm (2 in) (B) below the black masking.
7. If the exterior antenna coupling is installed, align the inner antenna coupling to the exterior coupling.
8. Press firmly on all 4 corners and on the center of the antenna inner coupling (2) in order to ensure proper adhesion to the back glass (4). Hold pressure on the inner coupling (2) for 10-30 seconds.
9. Inspect the installation to ensure that no surface gaps are present between the couplings (5,2) and the back glass (4).
10. Connect the coaxial cable (1) to the inner antenna coupling.

Scheme 167

1. Install the inner coupling first, if both the inner and outer couplings are to be replaced. Refer to «COUPLING REPLACEMENT - ANTENNA INNER»(ref-188872-S26575836632005090500000) .
2. Use a thin, wide-bladed plastic tool to cut the double back tape material, while lifting up on the outer antenna coupling.

Scheme 168

Scheme 169

1. Clean the outside of the back glass with alcohol wipe.
2. Dry the glass thoroughly using a lint free cloth. IMPORTANT: The adhesion promoter must be used to assure adequate bonding of the coupling. Mask or protect the surrounding area before applying the adhesion promoter.
3. Apply Glass Adhesion Promoter GM P/N 12378555 (Canadian P/N 88901239) to the back glass in the area the antenna coupling is to be installed. Follow the Glass Adhesion Promoter instructions on the product label. IMPORTANT: Ensure the inner and outer antenna couplings are aligned. Do not touch the adhesive backing on the antenna coupling.
4. Remove the protective film from the adhesive backing on the outer antenna coupling.
5. Align the outer antenna coupling to the inner antenna coupling.
6. Press firmly on all 4 corners and on the center of the antenna outer coupling (2) in order to ensure proper adhesion to the back glass (4). Hold pressure on the outer coupling (5) for 10-30 seconds.
7. Ensure that no gaps are present between the couplings (5, 2) and the back glass (4).

Scheme 170

1. Ensure the ignition is in the OFF position.
2. Remove the electrical connector from the antenna.
3. While maintaining a parallel angle to the windshield, remove the antenna from the bracket by sliding the antenna away from the headlinliner.

Scheme 171

1. Position the antenna to the bracket.
2. While maintaining a parallel angle to the windshield, install the antenna to the bracket by sliding the antenna towards the headlinliner. Ensure the antenna is fully seated to the bracket.
3. Install the electrical connector to the antenna.

Scheme 172

1. Remove the navigation antenna. Refer to «NAVIGATION ANTENNA REPLACEMENT»(ref-188872-S12515425052005090500000)
2. Lower the front portion of the headliner in order to expose the antenna bracket. Refer to HEADLINER REPLACEMENT (TRAILBLAZER, ENVOY, BRAVADA) or HEADLINER REPLACEMENT (TRAILBLAZER EXT, ENVOY XL)
3. Remove the retaining screw from the antenna bracket.
4. Release the retaining clip from the roof panel.
5. Remove the antenna bracket from the roof panel.

Scheme 173

1. Position the antenna bracket to the roof panel.
2. Seat the antenna bracket retaining clip to the roof panel. NOTE: Refer to Fastener Notice in Cautions and Notices.
3. Install the retaining screw to the antenna bracket. Tighten Tighten the screw to 2.5 N.m (22 lb in).
4. Install the headliner. Refer to HEADLINER REPLACEMENT (TRAILBLAZER, ENVOY, BRAVADA) or HEADLINER REPLACEMENT (TRAILBLAZER EXT, ENVOY XL)
5. Install the navigation antenna. Refer to «NAVIGATION ANTENNA REPLACEMENT»(ref-188872-S12515425052005090500000)

OnStar Button Assembly Replacement

The OnStar® button assembly located on the inside rearview mirror can not be serviced separately. Should the button assembly need to be replaced, the entire inside rearview mirror assembly will need to be replaced. Refer to REARVIEW MIRROR REPLACEMENT in Stationary Windows.

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Scheme 177

1. Position the right rear seat bottom to a cargo position.
2. Remove the protective cover from the vehicle communication interface module (VCIM).
3. Remove the module from the upper bracket by releasing the retaining tab.
4. Remove the electrical connectors from the VCIM.
5. Remove the VCIM from the vehicle

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1. If replacing the VCIM, record the 10-digit STID number, and the 11-digit ESN number from the labels on the new module.
2. Install the module to the upper bracket ensuring the retaining tab is fully seated. NOTE: In order to avoid damage to the circuit board, do NOT over-tighten the thumb screws. Using your fingers, apply only a light pressure.
3. Connect the 2 electrical connectors. Tighten Tighten the module thumb screw to a maximum of 0.2 N.m (2 lb in).
4. Install the protective cover to the module.
5. Position the right rear seat bottom to a passenger position. IMPORTANT: After replacing the vehicle communication interface module, you must reconfigure the OnStar® system. Failure to reconfigure the system will result in an additional customer visit for repair. In addition, pressing and holding the white dot button on the keypad will NOT reset this version of the OnStar® system. This action will cause a DTC to set.
6. Install the scan tool. Use the special functions menu in order to perform the OnStar® setup procedure for this vehicle.
7. Move the vehicle to an open area that is away from tall buildings and with a clear view of unobstructed sky. Allow the vehicle to run for 10 minutes.
8. Use the ID information menu on the scan tool to access the new station ID (STID) and the electronic serial number (ESN) from the new VCIM.
9. Press the blue OnStar® button to connect to the OnStar® Call Center and perform the following procedure: 9.1. Tell the advisor that this vehicle has received a new VCIM. 9.2. Ask the advisor to add the new STID and the ESN to update the customer's account. 9.3. Follow any additional instructions from the OnStar® advisor. 9.4. Ask the advisor to activate the OnStar® Personal Calling feature, if available.

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Scheme 181

1. Fold and tumble the right second row seat to a cargo position.
2. Remove the protective cover (1) from the vehicle communication interface module (VCIM).
3. Remove the VCIM from the bracket by releasing the retaining tab (1).
4. Remove the electrical connectors from the VCIM.
5. Remove the VCIM from the vehicle.

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1. If replacing the VCIM, record the 10-digit STID number, and the 11-digit ESN number from the labels on the new module.
2. Position the VCIM near the mounting location.
3. Install the quick connector to the VCIM.
4. Install the remaining electrical connectors to the VCIM.
5. Install the VCIM (1) to the bracket.
6. Ensure the retaining tab (1) is fully seated.
7. Install the protective cover (1) to the module.
8. Position the right second row seat to a passenger position. IMPORTANT: After replacing the vehicle communication interface module, you must reconfigure the OnStar® system. Failure to reconfigure the system will result in an additional customer visit for repair. In addition, pressing and holding the white dot button on the keypad will NOT reset this version of the OnStar® system. This action will cause a DTC to set.
9. Install the scan tool. Use the special functions menu in order to perform the OnStar® setup procedure for this vehicle.
10. Move the vehicle to an open area that is away from tall buildings and with a clear view of unobstructed sky. Allow the vehicle to run for 10 minutes.
11. Use the ID information menu on the scan tool to access the new station ID (STID) and the electronic serial number (ESN) from the new VCIM.
12. Press the blue OnStar® button to connect to the OnStar® Call Center and perform the following procedure: 12.1. Tell the advisor that this vehicle has received a new VCIM. 12.2. Ask the advisor to add the new STID and the ESN to update the customer's account. 12.3. Follow any additional instructions from the OnStar® advisor. 12.4. Ask the advisor to activate the OnStar® Personal Calling feature, if available.

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Scheme 187

1. Remove the right rear seat cushion. Refer to SEAT CUSHION REPLACEMENT - REAR NO. 1 (TRAILBLAZER, ENVOY, BRAVADA) in Seats.
2. Remove the communication interface module. Refer to «COMMUNICATION INTERFACE MODULE REPLACEMENT (TRAILBLAZER, ENVOY, BRAVADA)»(ref-188872-S12355154122005090500000) or «COMMUNICATION INTERFACE MODULE REPLACEMENT (TRAILBLAZER EXT, ENVOY XL)»(ref-188872-S10866578702005090500000) in Interior Trim.
3. Using a flat bladed tool, release the retaining tab on the upper bracket.
4. Slide the upper bracket inboard until the retaining tabs are released from the processor bracket.
5. Remove the upper bracket from the processor bracket.
6. Remove the nut that retains the processor bracket to the rear seat back stud.
7. Remove the processor bracket from the vehicle.

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Scheme 189

1. Install the processor bracket to the rear seat studs. NOTE: Refer to Fastener Notice in Cautions and Notices.
2. Install the nut to the rear seat back stud. Tighten Tighten the nut to 45 N.m (33 lb ft).
3. Position the upper bracket to the processor bracket.
4. Slide the upper bracket outboard until all the retaining tabs are seated to the processor bracket.
5. Install the communication interface module. Refer to «COMMUNICATION INTERFACE MODULE REPLACEMENT (TRAILBLAZER, ENVOY, BRAVADA)»(ref-188872-S12355154122005090500000) or «COMMUNICATION INTERFACE MODULE REPLACEMENT (TRAILBLAZER EXT, ENVOY XL)»(ref-188872-S10866578702005090500000) in Interior Trim.
6. Install the right rear seat cushion. Refer to SEAT CUSHION REPLACEMENT - REAR NO. 1 (TRAILBLAZER, ENVOY, BRAVADA) in Seats.

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Scheme 191

1. Fold and tumble the right rear seat to a cargo position.
2. Leaving the electrical connectors attached, remove the communication interface module from the vehicle communication interface module (VCIM) bracket. Refer to «COMMUNICATION INTERFACE MODULE REPLACEMENT (TRAILBLAZER, ENVOY, BRAVADA)»(ref-188872-S12355154122005090500000) or «COMMUNICATION INTERFACE MODULE REPLACEMENT (TRAILBLAZER EXT, ENVOY XL)»(ref-188872-S10866578702005090500000) in Interior Trim.
3. Using a flat bladed tool, release the retaining tab (1) on the VCIM bracket.
4. Slide the VCIM bracket rearward until the retaining tabs are released from the seat bracket.
5. Remove the VCIM bracket from vehicle.
6. Slide the VCIM bracket rearward until the retaining tabs are released from the seat bracket.
7. Remove the VCIM bracket from vehicle.

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Scheme 193

1. Position the VCIM bracket to the seat bracket.
2. Slide the VCIM bracket forward until the retaining tabs become locked to the seat bracket.
3. Ensure the retaining tab (1) on the VCIM bracket is properly seated.
4. Install the communication interface module. Refer to «COMMUNICATION INTERFACE MODULE REPLACEMENT (TRAILBLAZER, ENVOY, BRAVADA)»(ref-188872-S12355154122005090500000) or «COMMUNICATION INTERFACE MODULE REPLACEMENT (TRAILBLAZER EXT, ENVOY XL)»(ref-188872-S10866578702005090500000) in Interior Trim.
5. Position the right second row seat to a passenger position.

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1. Remove the overhead console. Refer to OVERHEAD CONSOLE REPLACEMENT - FRONT in Interior Trim.
2. Disconnect the microphone electrical connector to the OnStar® microphone (1).
3. If only the microphone removal is required, disengage the quick release tab (1) and remove the OnStar® microphone from the overhead console.
4. If removing the mounting bracket is required, remove the 2 retaining screws to the OnStar® microphone and remove the bracket from the overhead console.

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1. If installation of the mounting bracket is required, install the mounting bracket to the overhead console. NOTE: Refer to Fastener Notice in Cautions and Notices.
2. Install the 2 OnStar® microphone retaining screws. Tighten Tighten the screws to 0.8 N.m (7 lb in).
3. Install the microphone to the mounting bracket ensuring the quick release tab (1) is fully seated.
4. Connect the electrical connector to the OnStar® microphone (1).
5. Install the overhead console. Refer to OVERHEAD CONSOLE REPLACEMENT - FRONT in Interior Trim.