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 433 (BODY CONTROL SYSTEM)DESCRIPTION AND OPERATIONBODY CONTROL SYSTEM DESCRIPTION AND OPERATIONDASH INTEGRATION MODULE (DIM)
1999 GMC Forward Control 5.7 R, Automatic
Dash Integration Module (DIM)
1999 GMC Forward Control 5.7 R, AutomaticSECTION Dash Integration Module (DIM)
WARNING: This page is about a different car, the 2002 Oldsmobile Aurora and 2001 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
The various DIM input and output circuits are described in the corresponding functional areas as indicated on the DIM electrical schematics.
The DIM functions include the following:
- A/C refrigerant low temperature sensor signal.
- Air conditioning orifice solenoid control.
- Backlight lamps control.
- Control of headlights and exterior lamps.
- Control power control.
- DRL relay control.
- Flash to pass signal.
- Headlamps on w/wipers signal.
- Headlamps switch signal.
- Horn relay control.
- Interior lamps incandescent dimming.
- Power moding control over Class 2 serial data line.
- Reverse lockout solenoid control.
- Storage of the clock settings and, sending a message out on the class 2 serial data circuit in response to requests from other modules.
- Steering wheel controls.
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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.