Component Tests and General Diagnostics

Checking the supply voltage/ground terminal

Voltage supply, Remote Digital Audio Receiver (RDAR)
Remote Digital Audio Receiver (RDAR) is supplied with voltage via a voltage input on the control module.
Power input #A C1:1 is supplied with voltage via a fuse from the battery.

Checking the power supply
Also check the power supply cable from the battery to the fuse in the fuse box, in the engine compartment and from the fuse for the Remote Digital Audio Receiver (RDAR). Check for an open-circuit. Check for loose connections. Check for contact resistance and oxidation. Check the fuse. Voltage should be about equal to battery voltage.

Ground terminal, Remote Digital Audio Receiver (RDAR)
The control module has a ground input. See the relevant wiring diagram for further information about the ground terminal.
Ground input #C1:2 is power ground and is connected to the ground connection in the car body.

Checking the ground terminal
Check the ground cable between control module (#C1:2) and the ground terminal for an open-circuit, loose connections, contact resistance and oxidation. With the ignition on, the drop in voltage between the ground connection for the control module and the ground terminal must not be greater than 0.5 V.
Remedy as necessary.

Other information:
- Checking wiring and terminals Checking Wiring and Terminals
- Location of components Component Location, Remote Digital Audio Receiver (RDAR)
- Signal specification Pinout Values and Diagnostic Parameters
- See the relevant wiring diagram for information about circuits and ground terminals in the bodywork.

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