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 183 (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 Pontiac Aztek and 2003 Buick Rendezvous. 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 52 | In underhood fuse block. |
| ACCY Relay 27 | In center console fuse block. |
| Air Pump Relay 63 | In underhood fuse block. |
| Automatic Level Control Compressor Relay | Inside vehicle, behind left rear wheelhouse. |
| Automatic Level Control Inflator Time Relay | Inside vehicle, behind left rear wheelhouse. |
| Cool FANSP Relay 59 | In underhood fuse block. |
| Cool FAN1 Relay 62 | In underhood fuse block. |
| Cool FAN2 Relay 59 | In underhood fuse block. |
| Cool FAN2 Relay 61 | In underhood fuse block. |
| Cool FAN3 Relay 61 (Pontiac) | In underhood fuse block. |
| Crank Relay 58 | In underhood fuse block. |
| DRL Relay 53 | In underhood fuse block. |
| FOG LPS Relay 57 | In underhood fuse block. |
| Fuel Pump Relay 51 | In underhood fuse block. |
| Hazard & Turn Signal Flasher | In center console fuse block. |
| HDLP Lo-Beam Relay 54 | In underhood fuse block. |
| HDLP Hi-Beam Relay 56 | In underhood fuse block. |
| Horn Relay 50 | In underhood fuse block. |
| IGN 3 Relay 23 | In center console fuse block. |
| Ignition Relay 60 | In underhood fuse block. |
| PARK LPS Relay 55 | In underhood fuse block. |
| RAP Relay 33 | In center console fuse block. |
| RR Defog Relay 20 | In center console fuse block. |
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.