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.
1999 Volvo S80 BaseFACTORY OEM SERVICE PROCEDURE
Control Units
CONTROL UNITS
| Component | Component Location |
|---|---|
| ABS Control Module | At left rear corner of engine compartment. |
| Blower Fan Control Module | Behind right side of dash, near blower motor. See Figure . |
| Central Electronic Module (CEM) | Behind left side of dash, on passenger compartment relay box. |
| Engine Cooling Fan Control Module | At front center of engine compartment. |
| Engine Control Module (ECM) | At right side of engine compartment, forward of strut tower. See Figure . |
| Power Driver's Seat Control Module | Under driver's seat. |
| Rear Electronic Module (REM) | At left side of trunk, on cargo compartment relay/fuse box. |
| RTI Control Module | At left side of trunk. |
| SRS Control Module | Below floor console, behind gear selector lever. |
| Sun Roof Control Module | Forward of sun roof opening. |
| Throttle Body Control Module | On left side of engine. See Figure . |
| Transmission Control Module | At right side of engine compartment, forward of strut tower. |
| Upper Electronic Module (UEM) | Above center of windshield, on rearview mirror. |
Factory Service Tools
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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.
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