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) (2008-2009): Function: Phone
The phone module (PHM) (16/60) does not have its own menu keypad. It is controlled via the keypad of the climate control module (CCM) (4/6) or via the steering wheel buttons.
The climate control module (CCM) transmits menu navigation signals to the infotainment control module (ICM) (3/281) via the CAN network. The infotainment control module (ICM) then forwards the signals to the phone module (PHM) via the MOST network.
When using the menu via the steering wheel buttons information is transmitted from the steering wheel module (SWM) (3/130) to the infotainment control module (ICM) via LIN communication. The information is then transmitted to the phone module (PHM) via the MOST network.
Menu management is displayed for the user in the display for the infotainment control module (ICM). Information is transmitted from the phone module (PHM) to the infotainment control module (ICM) via the MOST network.
When starting the phone module (PHM), receiving incoming calls or when using the phone, a request to use the display will be transmitted to the infotainment control module (ICM).
Phone calls can be connected either via handsfree or the handset.
During calls via handsfree, the microphone and speakers connected to the integrated audio module (IAM) (16/1) and audio module (AUD) (16/105) are used. The phone module (PHM) transmits a request to the infotainment control module (ICM) to receive access to the speakers and microphone. The infotainment control module (ICM) transmits the request onward to the integrated audio module (IAM) and audio module (AUD). Communication between the phone module (PHM), infotainment control module (ICM), integrated audio module (IAM) and audio module (AUD) occurs 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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