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 186 (ELECTRICAL COMPONENT LOCATOR)BUZZERS, RELAYS & TIMERS
1999 GMC Forward Control 5.7 R, Automatic
Buzzers, Relays & Timers
1999 GMC Forward Control 5.7 R, AutomaticSECTION Buzzers, Relays & Timers
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.
BUZZERS, RELAYS & TIMERS LOCATION
| Component | Location |
|---|---|
| A/C CLU Relay | In underhood fuse block. See Figure . |
| Air Pump Relay | In underhood fuse block. See Figure . |
| ALC HDLP Relay | In instrument panel fuse block. See Figure . |
| ALC PRK LP Relay | In instrument panel fuse block. See Figure . |
| Back-Up LP Relay | In underhood fuse block. See Figure . |
| Blower Motor Relay | On multi-use relay & fuse bracket, above BCM. |
| BOSE Relay | In instrument panel fuse block. See Figure . |
| Cooling Fan 1 Relay | In underhood fuse block. See Figure . |
| Cooling Fan 2 Relay | In underhood fuse block. See Figure . |
| Cooling Fan 3 Relay | In underhood fuse block. See Figure . |
| Courtesy Lamp Relay | In instrument panel fuse block. See Figure . |
| Daytime Running Lamp Relay (2) | In instrument panel fuse block. See Figure . |
| Defogger RR Relay | In instrument panel fuse block. See Figure . |
| DRL L Relay | In instrument panel fuse block. |
| Fog LP Relay | In underhood fuse block. See Figure . |
| Fuel Pump Relay | In underhood fuse block. See Figure . |
| Hatch/TRK Relay | In instrument panel fuse block. See Figure . |
| Horn Relay | In underhood fuse block. See Figure . |
| Ignition Relay | In underhood fuse block. See Figure . |
| Monitored Micro Relay | In instrument panel fuse block. See Figure . |
| Power Top Up/Down Relay | Behind left rear seat, near rear of luggage compartment. |
| RTD Relay | In underhood fuse block. See Figure . |
| Steering Column Lock Relay | In right footwell, mounted to toe board. |
| Theft Deterrent Relay | In right footwell, above BCM. |
| TONN REL Relay | In instrument panel fuse block. See Figure . |
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.