Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 735 (ENTERTAINMENT SYSTEM)REPAIR INSTRUCTIONSANTENNA EXTENSION CABLE REPLACEMENT (REAR LIFT WINDOW, COUPE)INSTALLATION PROCEDURE

1999 GMC Forward Control 5.7 R, Automatic

Installation Procedure

1999 GMC Forward Control 5.7 R, AutomaticSECTION Installation Procedure

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Coaxial Extension Cable At Antenna Module

Courtesy of GENERAL MOTORS CORP.

Install the rear lift window antenna coaxial extension cable push -in fastener retainers to the front seat back reinforcement panel and along the lock pillar.
Connect the coaxial extension cable to the antenna module.

Fig 2: Rear Lift Window Antenna Coaxial Extension Cable At Antenna Buffer

Courtesy of GENERAL MOTORS CORP.

Working upward along the roof bow, install the remaining coaxial extension cable push -in fastener retainers.
Connect the coaxial extension cable to the antenna buffer.
Install the lock pillar trim panel. Refer to Trim Replacement - Lock Pillar (Upper Convertible) or Trim Replacement - Lock Pillar (Coupe) or Trim Replacement - Lock Pillar (Lower Convertible and Hard Top) in Interior Trim.
Install the rear compartment side trim panel. Refer to Trim Panel Replacement - Rear Compartment Front Side (Convertible) or Trim Panel Replacement - Rear Compartment Front Side (Hardtop) or Trim Panel Replacement - Rear Compartment Front Side (Coupe) in Interior Trim.
Install the roof bow interior trim panel. Refer to Trim Panel Replacement - Rear Roof Bow in Interior Trim.

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.