Checking the Power Supply and Ground Terminals Power Supply Multimedia Module (MMM)

Checking The Supply Voltage/ground Terminal, Multimedia Module (MMM)

Checking the power supply and ground terminals Power supply multimedia module (MMM)





The multimedia module (MMM) is powered via a power input on the control module.

When the ignition is on, the power input is powered and the multimedia module (MMM) is in active mode.
- Power input 1 (terminal #21 (#A1)) is powered via a fuse from the central electronic module (CEM). The multimedia module (MMM) will not be activated if there is an open-circuit.

Checking the power supply
Check the power supply cable from the battery to the central electronic module (CEM) and from the central electronic module (CEM) to multimedia module (MMM) terminal #21 (#A1). Check for an open-circuit. Check for loose connections. Check for contact resistance. Check for oxidation. Check the fuse. The voltage must be approximately battery voltage when the ignition is on.

Ground terminal multimedia module (MMM)
The multimedia module (MMM) 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 #25 (#A5) is power ground and is connected to the ground terminal in the car body.

Checking the ground terminal
Check the ground lead between multimedia module (MMM) terminal #25 (#A5) 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 multimedia module (MMM) and the ground terminal must not be greater than 0.5 V.

Remedy as necessary.

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

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