V50 L5-2.4L VIN 39 B5244S7 (2005)
Communications Control Module: Component Tests and General Diagnostics
Checking Supply Voltage/Ground Terminal, Media Player Module (MPM)
Checking the supply voltage/ground terminal
Checking the power supply and ground terminals
Power supply, media player module (MPM)
The media player module (MPM) is powered via a power input on the control module.
When the ignition is on, both power inputs are powered and the media player module (MPM) is in active mode.
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The power input terminal 1 (#A1) is powered via a fuse from the central electronic module (CEM). The media player module (MPM) will not be
activated if there is an open-circuit
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The power input terminal 2 (#A2) is powered via a fuse from the central electronic module (CEM). The media player module (MPM) will be
activated when the power input is supplied with power. The media player module (MPM) 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 the media
player module (MPM) (#A2). 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.
Check the power supply cable from the battery to the central electronic module (CEM) and from the central electronic module (CEM) to the media
player module (MPM) (#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, media player module (MPM)
The media player module (MPM) 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 terminal 1 (#A4) is power ground and is connected to the ground terminal in the car body.
Checking the ground terminal
Check the ground lead between the media player module (MPM) (#A4) 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 media player module
(MPM) 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 Specification, Media Player Module (MPM)
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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