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.
1998 GMC EnvoyFACTORY OEM SERVICE PROCEDURE
Circuit Protection Devices
CIRCUIT PROTECTION DEVICES
| Component | Component Location |
|---|---|
| A/C Compressor Clutch Diode (2.2L VIN 4) | In A/C compressor wire harness, between A/C compressor & engine harness breakout. See Figure. |
| A/C Compressor Clutch Diode (4.3L VIN W, X) | In A/C compressor clutch wire harness, behind compressor. See Figure. |
| Anti-lock Diode | In instrument cluster. |
| Battery Megafuse | On right side of radiator support, below battery. |
| Body Bussed Electrical Center (BBEC) | Behind left side of dash, near I/P fuse block. |
| Brake Warning Diode | In instrument cluster. |
| Daytime Running Lamps (DRL) Diode | In underhood bussed electrical center. |
| I/P Fuse Block | On left side of dash. |
| Power Seats Circuit Breaker | In body bussed electrical center. |
| Power Window Circuit Breaker | In body bussed electrical center. |
| Underhood Bussed Electrical Center (UBEC) | On top of left front fender wall. See Figure. |
Factory Service Tools
Use the Manual With the Right Hardware
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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.