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.
2003 Volvo S80 BaseFACTORY OEM SERVICE PROCEDURE
Control Units
CONTROL UNITS LOCATION
| Component | Component Location |
|---|---|
| Accessory Electronic Module | At right rear corner of trunk. See Figure . |
| Brake Control Module | At left rear of engine compartment. See Figure . |
| Central Electronic Module | Behind left side of dash. See Figure . |
| Climate Control Module | Integral to A/C controls, in center of dash. See Figure . |
| Cooling Fan Control Module | At right front of engine compartment. See Figure . |
| Differential Electronic Module | Under left rear seat. See Figure . |
| Electronic Throttle Module | On left side of engine. See Figure . |
| Engine Control Module | At right side of engine compartment, forward of strut tower. See Figure . |
| Fan Control Module | Behind right side of dash, near blower fan. See Figure . |
| Power Seat Module | Under driver's seat. See Figure . |
| Rear Electronic Module | At left rear corner of trunk. See Figure . |
| Road Traffic Information | At left side of trunk. |
| Siren Control Module | At right front corner of engine compartment. See Figure . |
| Steering Angle Sensor Module | On side of passenger compartment relay box. See Figure . |
| Sun Roof Control Module | Forward of sun roof opening. |
| Supplemental Restraints System Control Module | Below rear of center console. See Figure . |
| Transmission Control Module | At right side of engine compartment, forward of strut tower. See Figure . |
| Upper Electronic Module | Above center of windshield, on rearview mirror. See Figure . |
| Vehicle Inclination Module | At left rear corner of trunk. 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.
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