Cellular Communication System: Removal & Installation Chevrolet Silverado 2500

Installation Procedure

1. Install the six cable clips (2) to the A-pillar.
2. Connect the cable connector (1) to the antenna base.
3. Connect the cable connector (3) to the VCU.
4. Install the front of the headliner.
5. Install the I/P trim panel. Refer to «TRIM PANEL REPLACEMENT - INSTRUMENT PANEL (I/P) UPPER»(ref-176702-S10596506242005051000000) .

Scheme 78

1. Remove the IP trim panel. Refer to «TRIM PANEL REPLACEMENT - INSTRUMENT PANEL (I/P) UPPER»(ref-176702-S10596506242005051000000) .
2. Lower the front of the headliner.
3. Disconnect the cable connector (5) from the VIU connector.
4. Disconnect the in-line harness connector (4).
5. Disconnect the harness connector (2) from the microphone connector.
6. Disconnect the cable connector (3) from the GPS antenna.
7. Remove the cable clips from the A-pillar and roof.
8. Remove the cable assembly from the vehicle.

1. Install the cable clips to the A-pillar and roof.
2. Connect the cable connector (3) to the GPS antenna.
3. Connect the harness connector (2) to the microphone connector.
4. Connect the in-line harness connector (4).
5. Connect the cable connector (5) to the VIU connector.
6. Install the front of the headliner.
7. Install the IP trim panel. Refer to «TRIM PANEL REPLACEMENT - INSTRUMENT PANEL (I/P) UPPER»(ref-176702-S10596506242005051000000) .

Scheme 79

1. Lower the front of the headliner.
2. Disconnect the coaxial cable from the inner antenna base.
3. Remove the cell antenna mast by turning counterclockwise.
4. Remove the fastener until the outer base can be separated from the roof of the vehicle.
5. Push on the tab in the small hole of the inner antenna base.
6. Remove the inner antenna base from the vehicle.

1. Install the inner antenna base in the large hole first, then push in the tab into the small hole until the tab locks into place.
2. Install the outer antenna base to the roof.
3. Install the fastener. Tighten the antenna fastener to 3 N.m (27 lb in).
4. Install the outer antenna mast to the fastener by turning clockwise.
5. Connect the coaxial cable to the inner antenna base.
6. Install the front of the headliner.

Scheme 80

1. Lower the headliner.
2. Disconnect the cables from the antenna.
3. Loosen the retaining nut till the antenna assembly can be pulled from the top of the roof.

1. Place the antenna assembly on the roof opening.
2. Tighten the retaining nut. Tighten the nut to 6 N.m (53 lb in).
3. Connect the antenna cables
4. Install the headliner.

Scheme 81

1. Remove the navigation antenna from the ground plate. Refer to «Navigation Antenna Replacement»(ref-176696-S42047930762005051100000) .
2. Remove the headliner.
3. Use a drill bit to drill the head of the rivet (2) out.
4. Remove the plate (1) from the roof.
5. Ensure that there are no pieces of metals in the roof to cause rattle while driving.

1. Install the ground plate to the roof making sure the locking tabs slides into the holes in the roof.
2. Install a new rivet (2) to retain the ground plate in place.
3. Install the headliner.
4. Install the navigation antenna to the ground plate.
5. Inspect the operation of the Onstar® system.

Scheme 82

1. Remove the antenna by sliding it towards the front of the vehicle from the bracket in small increments.
2. Disconnect the coaxial cable from the antenna.
3. Remove the antenna from the bracket.

1. Install the antenna to the bracket in order to connect the coaxial cable.
2. Connect the coaxial cable to the antenna.
3. Slide the antenna until it clicks in place.

OnStar® Button Assembly Replacement (Pickup)

The OnStar® button assembly located on the rearview mirror can not be serviced separately from the rearview mirror. Should the button assembly need to be replaced, the entire rearview mirror assembly will need to be replaced.

Scheme 83

OnStar® Vehicle Communication Unit (VCU) Replacement

Important: Never swap OnStar® vehicle integration units (VIU), or the vehicle communication units (VCU) from other vehicles. Transfer of OnStar® components from other vehicles should NOT be done. Each OnStar® component has a unique identification number. The VIU has a 10-digit specific station identification (STID) and the VCU has a 11-digit specific electronic serial number (ESN). These identification numbers are used by the National Cellular Telephone Network and OnStar® systems, and are stored in the General Motors vehicle history files by VIN.

Scheme 84

1. Remove the IP trim panel. Refer to «TRIM PANEL REPLACEMENT - INSTRUMENT PANEL (I/P) UPPER»(ref-176702-S10596506242005051000000) .
2. Remove the IP cluster harness in order to gain access to the VCU bracket screw.
3. Remove the screw securing the VCU to the bracket.
4. Disconnect the electrical connectors.
5. Remove the VCU from the bracket.
6. The old VCU must be returned for core credit.

1. Record the 11-digit ESN from the label on the new VCU module. 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.
2. Install the VCU to the bracket.
3. Connect the electrical connectors to the VCU.
4. Install the screw. Tighten the screw to 9 N.m (80 lb in).
5. Install the IP cluster harness.
6. Install the IP trim panel. Refer to «TRIM PANEL REPLACEMENT - INSTRUMENT PANEL (I/P) UPPER»(ref-176702-S10596506242005051000000) .
7. Press and hold the "end call" button, which is a black button with a white dot. The OnStar® status light will change from green to red to green.
8. Contact the OnStar® Dealer support line by pressing the blue OnStar® button twice. The 11-digit ESN number will be needed by the OnStar® advisor.

OnStar® Vehicle Interface Unit (VIU) Replacement

Important: Never swap OnStar® vehicle integration units (VIU), or the vehicle communication units (VCU) from other vehicles. Transfer of OnStar® components from other vehicles should NOT be done. Each OnStar® component has a unique identification number. The VIU has a 10-digit specific station identification (STID) and the VCU has a 11-digit specific electronic serial number (ESN). These identification numbers are used by the National Cellular Telephone Network and OnStar® systems, and are stored in the General Motors vehicle history files by VIN.

Scheme 85

1. Remove the IP trim panel. Refer to «TRIM PANEL REPLACEMENT - INSTRUMENT PANEL (I/P) UPPER»(ref-176702-S10596506242005051000000) .
2. Remove the 2 screws (1) securing the VIU to the bracket.
3. Disconnect the electrical connectors.
4. Remove the VIU from the bracket.
5. The old VIU must be returned for core credit.

1. Record the 10-digit STID number from the label on the VIU module.
2. Install the VIU to the bracket.
3. Connect the electrical connectors.
4. Install the screws (1) securing the VIU to the bracket. Tighten the screws to 9 N.m (80 lb in).
5. Install the IP trim panel. Refer to «TRIM PANEL REPLACEMENT - INSTRUMENT PANEL (I/P) UPPER»(ref-176702-S10596506242005051000000) .
6. Contact the OnStar® Dealer Support line by pressing the OnStar® button twice. The 10-digit STID number recorded will be needed by the OnStar® Dealer Support line.

Scheme 86

1. Remove the overhead console.
2. Disconnect the microphone (2) connector from the jumper harness.
3. Unclip the microphone bracket (1) from the overhead console.
4. Disconnect the microphone 2-way connector (2) from the mating 2-way connector.

1. Mount the microphone (1) to the overhead console at the left rear corner of the overhead console.
2. Clip the microphone bracket (1) to the overhead console.
3. Connect the microphone connector (2) to the mating 2-way connector.
4. Reinstall the overhead console.