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 S40FACTORY OEM SERVICE PROCEDURE
Control Units
CONTROL UNITS LOCATION
| Component | Component Location |
|---|---|
| ABS Control Module | In right front corner 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 . |
| Cruise Control Module | Behind lower center of dash. See Figure . |
| Dynamic Stability Assistance Control Module | Behind right side of dash. See Figure . |
| Electronic Immobilizer Control Module | Behind left side of dash. See Figure . |
| Engine Management System | Behind lower center of dash. See Figure . |
| Fuel Throttle Body Control Module | Behind left side of dash. |
| Key-Inserted/Seat Belt Reminder Control Module | In passenger compartment fuse & relay box. |
| Passenger Compartment Fan Speed Control Module | Behind right side of dash, on bottom of HVAC assembly. See Figure . |
| Sun Roof Control Module | At front center of roof. See Figure . |
| Supplemental Restraint System Control Module | Below rear of center console, between front seats. See Figure . |
| Transmission Control Module | Behind lower center of dash. |
| Ultrasonic Glass Breakage Sensor Control Module | Below right side of dash. |
| VGLA Control Module | Behind lower center of dash. See Figure . |
| VGLA Receiver | In rear of engine compartment. See Figure . |
| Xenon Lamps Control Module | Under left rear seat. 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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