V50 L5-2.4L VIN 39 B5244S7 (2005)
Steering Mounted Controls Communication Module: Component Tests and General Diagnostics
Checking the supply voltage/ground terminal
Checking the power supply and ground terminal
Power supply, steering wheel module (SWM)
The steering wheel module (SWM) is powered via a power input on the control module.
Power input terminal #C1 (#1) receives +30-supply via fuse F3 in the relay/fusebox engine compartment (FJB) from the battery.
Checking the power supply
Check the power supply cable from the battery to steering wheel module (SWM) terminal #C1 (#1). 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.
Ground terminal, steering wheel module (SWM)
The steering wheel module (SWM) has a ground input. The ground input from the control module is power ground and is connected to ground terminal
63/5 in the car body. See the relevant wiring diagram for further information about the ground terminal.
Checking the ground terminal
Check the ground lead between steering wheel module (SWM) terminal #C4 (#4) 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 steering
wheel module (SWM) and the ground terminal must not be greater than 0.5 V.
Remedy as necessary.
Other information
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Connecting the breakout box See: Pinout Values and Diagnostic Parameters/Connecting The Breakout Box, Steering Wheel Module (SWM)
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Signal specification See: Pinout Values and Diagnostic Parameters/Signal Specification, Steering Wheel Module (SWM)
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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.