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) (2006-2008): Function: CARPHONE
Phone module (PHM) (16/60) does not have its own keypad for menu management. It is controlled either from the keypad on the climate control module (CCM) (3/112) or using the buttons on the steering wheel. The climate control module (CCM) transmits signals for menu management to the infotainment control module (ICM) (16/1.2) via the controller area network (CAN). The infotainment control module (ICM) then sends the signals on to the phone module (PHM) via the MOST network.
When controlling the menus via the steering wheel buttons (3/131), the information is transmitted from the steering wheel module (SWM) (3/254) 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.
Menu information is shown on the display on the infotainment control module (ICM). 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, when there are incoming calls or when the carphone is in use, a request is transmitted to the infotainment control module (ICM) to use the display.
Telephone calls can be made either hands free or using the handset.
During handsfree calls, the microphone and speaker are used, which are connected to the audio module (AUD) (16/105) or Integrated Audio Module (IAM) (16/1) if there is no Audio module (AUD).
The phone module (PHM) transmits a request to the infotainment control module (ICM) to access the speaker and microphone. The infotainment control module (ICM) transmits the request onwards to the audio module (AUD) or Integrated Audio Module (IAM).
Communication between the phone module (PHM), infotainment control module (ICM) and audio module (AUD)/Integrated Audio Module (IAM) 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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