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 184 (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 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
BUZZERS, RELAYS & TIMERS LOCATION
| Component | Location |
|---|---|
| A/C Relay | In underhood fuse block. |
| Blower Motor Relay | On center rear of engine compartment. |
| CHMSL Relay | In underhood fuse block. |
| CTSY LP Relay | In body relay block. |
| DR LOCK Relay | In body relay block. |
| DRL Relay (W/O ZR2) | In underhood fuse block. |
| DRL Relay (W/ZR2) | Taped to body harness, near breakout for rear washer hose. |
| DR UNLOCK Relay | In body relay block. |
| DRV UNLOCK Relay | In body relay block. |
| FOG LP Relay | In underhood fuse block. |
| F/PUMP Relay | In underhood fuse block. |
| HDLP GND Relay | In body relay block. |
| HDLP PWR Relay | In underhood fuse block. |
| HORN Relay | In underhood fuse block. |
| INADV PWR Relay | In body relay block. |
| LIFT GLASS Relay | In underhood fuse block. |
| PARK LP Relay | In body relay block. |
| RAP Relay | In body relay block. |
| RR DEFOG Relay | In underhood fuse block. |
| STARTER Relay | In underhood fuse block. |
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.