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.
2009 Volvo XC90 Base, AWDFACTORY OEM SERVICE PROCEDURE
Control Units
CONTROL UNITS LOCATION
| Component | Location |
|---|---|
| Accessory Electronic Module (AEM) (4/78) | At right rear corner of cargo compartment. See Figure. |
| Accessory USB Unit (AUU) (4/124) | In center console. See Figure. |
| Activation Unit DSTC (8/46) | On brake master cylinder. See Figure. |
| Alternator Control Module (6/26) | On alternator. See Figure. |
| Audio Module (AUD) (16/105) | Under right front seat. See Figure. |
| Brake Control Module (BCM) (4/16) | At left rear corner of engine compartment. See Figure. |
| Central Electronic Module (CEM) (4/56) | Behind left side of dash. See Figure. |
| Cooling Fan Module (4/71) | At front center of engine compartment. See Figure. |
| Differential Electronic Module (DEM) (4/82) | At rear differential. See Figure. |
| Driver/Passenger Door Module (DDM)/(PDM) (3/126) | In driver's door. See Figure. |
| Electronic Power Steering Control Module (4/99) | Left center of dash. See Figure. |
| Engine Control Module (ECM) (6-Cyl.) (4/46) | Left rear of engine compartment. See Figure. |
| Engine Control Module (ECM) (8-Cyl.) (4/46) | Left front of engine compartment. See Figure. |
| Fan Control Module (4/31) | Behind right side of dash, near blower fan. See Figure. |
| Fuel Pump Control Module (4/83) | On fuel tank. See Figure. |
| Global Positioning System Module (GPS) (16/139) | Under driver's seat. See Figure. |
| Headlight Control Module (HCM) (4/118) | Under driver's seat. See Figure. |
| Infotainment Control Module (ICM) (16/94) | Center of dash. See Figure. |
| Integrated Audio Module (IAM) (16/1) | Lower center of dash. See Figure. |
| Multimedia Module (MMM) (16/108) | Under driver seat. See Figure. |
| Parking Assistance Camera Module (PAC) (4/120) | Left side of luggage compartment. See Figure. |
| Parking Assistance Module (PAM) (4/86) | At left side of cargo area. See Figure. |
| Passenger/Driver Door Module (PDM)/(DDM) (3/127) | In front passenger's door. See Figure. |
| Phone Module (PHM) (16/60) | Behind center of dash. See Figure. |
| Power Seat Module (PSM) (4/52) | Under driver's seat. See Figure. |
| Rear Electronic Module (REM) (4/58) | At left rear corner of cargo compartment. See Figure. |
| Seat Heating Module (SHM) (Left/Right Front) (9/12, 9/13) | Under respective front seats. |
| Seat Heating Module (SHM) (Left/Right Rear) (9/14, 9/15) | Under respective rear seats. |
| Siren Control Module (SCM) (16/35) | Right front wheelwell. See Figure. |
| Steering Wheel Module (SWM) (3/254) | In steering wheel. See Figure. |
| Sun Roof Module (SRM) (4/33) | Forward of sun roof opening. See Figure. |
| Supplemental Restraint System Module (SRS) (4/9) | Under center console. See Figure. |
| Trailer Module (4/110) | Left rear of cargo compartment. See Figure. |
| Transmission Control Module (AW51) (4/28) | Right front of engine compartment. See Figure. |
| Transmission Control Module (TCM) (TF-80SC) (4/28) | On transmission. See Figure. |
| Upper Electronic Module (UEM) (4/70) | Rearward of roof console. See Figure. |
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.