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.
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HOMESERVICE MANUALSVOLVO2004XC90 AWD L5-2.5L TURBO VIN 59 B5254T2REPAIR AND DIAGNOSISACCESSORIES AND OPTIONAL EQUIPMENTENTERTAINMENT SYSTEMSDESCRIPTION AND OPERATIONINFOTAINMENT CONTROL MODULE (ICM)FUNCTION
2004 Volvo XC90 AWD L5-2.5L Turbo VIN 59 B5254T2
Function
2004 Volvo XC90 AWD L5-2.5L Turbo VIN 59 B5254T2SECTION Function
Function
Functions controlled by the infotainment control module (ICM)
For information about the functions controlled by the infotainment control module (ICM) but implemented by other control modules in the MOST network, see Design and Function for each control module and for the MOST network.
Security on MOST
The Security on MOST function is intended to prevent non-approved control modules from being installed in the car for the infotainment system. This is to prevent the theft of units.
This function is controlled by the infotainment control module (ICM) (16/1). The infotainment control module (ICM) checks the serial number of all the control modules in the MOST network and compares these with a stored list. The infotainment control module (ICM) retrieves data about the serial number of the control modules via the MOST network. The infotainment control module (ICM) then compares this information with the stored serial numbers.
If a control module is not in the stored list, it is disconnected from the MOST network and the functionality of this control module is blocked. This means that control modules in the MOST network cannot be transferred from one car to another.
If a control module which is in the stored list gives an incorrect response, a diagnostic trouble code (DTC) is stored in the infotainment control module (ICM). For further information, see Design and Function, MOST.
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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.