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 182 (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 Oldsmobile Aurora. 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. |
| ACCY Relay | In underhood fuse block. |
| CIGAR Relay | In rear fuse block. |
| COOL FAN 1 Relay (Low Speed) | In underhood fuse block. |
| COOL FAN 2 Relay (High Speed) | In underhood fuse block. |
| COOL FAN S/P Relay | In underhood fuse block. |
| DRL Relay | In underhood fuse block. |
| ELC Relay | In rear fuse block. |
| FOG LP Relay | In underhood fuse block. |
| FRT CTSY Relay | In rear fuse block. |
| F/PMP Relay | In rear fuse block. |
| F/TNKDR LOCK Relay | In rear fuse block. |
| F/TNKDR REL Relay | In rear fuse block. |
| HDLP HI BM Relay | In underhood fuse block. |
| HDLP LO BM Relay | In underhood fuse block. |
| Horn Relay | In underhood fuse block. |
| HVAC SOL Relay | In underhood fuse block. |
| IGN 1 Relay | In rear fuse block. |
| IGN 3 Relay | In rear fuse block. |
| INT LP Relay | In rear fuse block. |
| PARK Relay | In rear fuse block. |
| PRK LP Relay | In rear fuse block. |
| RAP Relay | In rear fuse block. |
| REVERSE Relay | In rear fuse block. |
| RR DEFOG Relay | In rear fuse block. |
| RR FOG LP Relay | In rear fuse block. |
| Secondary Air Injection Pump Relay (W/1 AIR Pump) | Right side of engine compartment, near strut tower. |
| Secondary Air Injection Pump Relay A (W/2 AIR Pumps) | Right side of engine compartment, near strut tower. |
| Secondary Air Injection (AIR) Pump Relay B (W/2 AIR Pumps) | Right side of engine compartment, near strut tower. |
| START 1 Relay | In underhood fuse block. |
| TRK REL Relay | In rear fuse block. |
| Turn Signal/Hazard Flasher Module | Behind left side of dash, above data link connector. |
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.