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.
Control Module
The integrated audio module (IAM) handles functions for:
- Radio reception (AM and FM)
- CD playback
- MD playback (option)
- RDS reception
The integrated audio module (IAM) communicates with directly connected components as well as with other control modules and components via the MOST network, which is a fiber-optic communication network.
The integrated audio module (IAM) is a slave module on the MOST network. The infotainment control module (ICM) is the master module.
The integrated audio module (IAM) is mounted in the center console. It is integrated with the audio unit and they are replaced together.
In order to function in the MOST network, the infotainment control module (ICM) checks that the integrated audio module (IAM) has a correct serial number. If the number is incorrect, the integrated audio module (IAM) does not work.
The integrated audio module (IAM) is available in three versions:
- Performance, with integrated radio, CD player and internal amplifier.
- High Performance, with integrated radio and CD player. A 6-disc CD changer and a combined CD/MD player are available as options. High Performance requires an external amplifier and an audio module (AUD).
- Premium Sound, with integrated radio and CD player. A 6-disc CD changer and a combined CD/MD player are available as options. Premium Sound requires an external amplifier and an audio module (AUD). A subwoofer with subwoofer module (SUB) is available as an option.
RDS reception (Radio Data System) is possible with FM broadcasts (market-dependent). The system is called RBDS (Radio Broadcast Data System) in USA.
The front and rear door speakers are connected to the control module or to the external amplifier's audio module (AUD), if fitted (regards High Performance and Premium Sound).
The integrated audio module (IAM) checks executed activations and input/output signals via its integrated diagnostics. If the control module detects a fault, a diagnostic trouble code is generated. Any diagnostic trouble codes are stored in the control module memory. The information can be read via the data link connector in the vehicle.
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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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