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.
Phone Module (PHM) (2003-2005): Function: CARPHONE
The phone module (PHM) (16/60) for the XC90 does not have its own keypad to control the menus. It uses the keypad on the infotainment control module (ICM) (16/1) panel.
When controlling the menus via the steering wheel buttons (3/131), the information is transmitted from the steering wheel module (SWM) (3/130) to the infotainment control module (ICM) via the CAN network. The information is then sent on to the phone module (PHM) via the MOST network.
The menu is displayed for the user in the infotainment control module's (ICM) display. The information is transmitted from the phone module (PHM) to the infotainment control module (ICM) via the MOST network.
When the phone module (PHM) is started, a request is transmitted to the infotainment control module (ICM) to use the display when there are incoming calls or when the carphone is in use.
Telephone calls can be made either hands free or using the handset. The phone module (PHM) for the XC90 does not have its own microphone or loudspeaker for hands free.
The microphone and loudspeaker for the Audio module (AUD) (16/105) are used instead for hands free calls. The phone module (PHM) transmits a request to the infotainment control module (ICM) to access the audio module (AUD) loudspeaker and microphone.
Communication between the phone module (PHM), infotainment control module (ICM) and audio module (AUD) is via the MOST network.
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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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