Checking the Power Supply and Ground Terminals Power Supply Audio Module (AUD)

Checking The Supply Voltage/ground Terminal, Audio Module (AUD)

Checking the power supply and ground terminals Power supply audio module (AUD)





The audio module (AUD) is powered via two power inputs on the control module.

When the ignition is on, both power inputs are powered and the audio module (AUD) is in active mode.

- Power input 1 (terminal #45 (#A1)) is supplied with power via a fuse from the battery. The audio module (AUD) will not be activated if there is an open-circuit
- Power input 2 (terminal #6 (#B6)) is supplied with power via a relay on the central electronic module (CEM). The relay is powered via a fuse from the battery. The relay coil can be diagnosed by the central electronic module (CEM). The audio module (AUD) will be activated when the power input is supplied with power. The audio module (AUD) will not be activated if there is an open-circuit.

Checking the power supply
Check the power supply cable from the battery to the relay on the central electronic module (CEM) and from the relay for audio module (AUD) terminal #6 (#B6). Check for an open-circuit. Check for loose connections. Check for contact resistance and oxidation. Check the fuse. The voltage must be approximately battery voltage when the ignition is on.

Check the power supply cable from the battery to audio module (AUD) terminal #45 (#A1). Check for an open-circuit. Check for loose connections. Check for contact resistance and oxidation. Check the fuse. The voltage must be approximately battery voltage when the ignition is on.

Ground terminal, audio module (AUD)
The audio module (AUD) has a ground input. The ground input from the control module is connected via a ground lead to the ground terminal in the car body.

- Ground input 1 (terminal #46 (#A2) is power ground and is connected to the ground terminal in the car body.

Checking the ground terminal
Check the ground lead between audio module (AUD) terminal #46 (#A2) and the ground terminal. Check for an open-circuit. Check for loose connections. Check for contact resistance. Check for oxidation. With the ignition on, the drop in voltage between the ground connection for the audio module (AUD) and the ground terminal must not be greater than 0.5 V.

Remedy as necessary.

Other information
- Connecting the breakout box
- Signal specification
- See the relevant wiring diagram for information about circuit and ground terminals in the bodywork
- Checking wiring and terminals

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