V50 L5-2.4L VIN 39 B5244S7 (2005)
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. See the relevant wiring diagram for further information about ground terminals.
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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
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Signal specification See: Pinout Values and Diagnostic Parameters/Signal Description, Multimedia Module (MMM)
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Connecting the breakout box See: Pinout Values and Diagnostic Parameters/Connecting the Breakout Box, Multimedia Module (MMM)
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See the relevant wiring diagram for information about circuit and ground terminals in the bodywork
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Checking wiring and terminals See: Testing and Inspection/Component Tests and General Diagnostics/Checking Wiring and Terminals
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