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 654 (SEAT SYSTEM)REPAIR INSTRUCTIONSSEAT ADJUSTER REPLACEMENT - FRONTREMOVAL PROCEDURE

1999 GMC Forward Control 5.7 R, Automatic

Removal Procedure

1999 GMC Forward Control 5.7 R, AutomaticSECTION Removal Procedure

WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

Remove the seat. Refer to SEAT REPLACEMENT (POWER) or SEAT REPLACEMENT (MANUAL) .

Fig 1: Seat
Courtesy of GENERAL MOTORS CORP.
Remove the adjuster adjustment bar (non-power seat).

Fig 2: Adjuster Adjustment Bar (Non-Power Seat)
Courtesy of GENERAL MOTORS CORP.
Remove the seat cushion cover. Refer to SEAT CUSHION TRIM COVER AND PAD REPLACEMENT .
Remove the seat cushion foam.

Fig 3: Seat Cushion Foam
Courtesy of GENERAL MOTORS CORP.
Reposition the lumbar pump, if equipped.
Remove the tie straps and reposition the pump and pouch up through the seat support wires.
Remove the seat belt harness from the seat frame (left seat).
Remove the memory seat control module, if equipped.

Fig 4: Removing Seat Belt Harness From Seat Frame (Left Seat)
Courtesy of GENERAL MOTORS CORP.
Remove the buckle side of the seat belt.

Fig 5: Buckle Side Of Seat Belt
Courtesy of GENERAL MOTORS CORP.
Remove the bolts (design 1) or the nuts (design 2) mounting the seat to the adjuster.
Remove the adjuster.
Transfer parts as necessary.

Fig 6: Adjuster
Courtesy of GENERAL MOTORS CORP.

RENDER: 1.0x

NO RELATED

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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.