Faulty Signal

Faulty signal

Checking fuses and power supply




The remote digital audio receiver (RDAR) is suppled power from the central electronic module (CEM) via a fuse.
Check if the fuse for the Remote Digital Audio Receiver (RDAR) is half burned by testing with a new fuse.

Hint: A half burned fuse can cause intermittent faults.

- Ignition on.
Check the supply voltage to the Remote Digital Audio Receiver (RDAR) by:
- Measure the voltage between control module connectors #C784-1 and #C784-2.
- Measuring the battery voltage.
If the difference between the control module's supply voltage and the battery voltage is greater than 2 V, the malfunction is in the supply cable.
If the difference is less than 2 V there may be an internal malfunction in the phone module (PHM).
- Remedy as necessary.

Other information
- For further information about the fuses and relays, see the Wiring Diagram
- Signal specification Pinout Values and Diagnostic Parameters
- Location of components Component Location, Remote Digital Audio Receiver (RDAR)
- Checking wiring and terminals Checking Wiring and Terminals
- Satellite radio control module Satellite Radio Control Module

Continue - Verification

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Verification




Verification

Hint: After carrying out the repair, check that the fault has been remedied.








- Ignition off
- Reinstall the connectors, components etc.
- Ignition on.
Check that the radio is working and that the reception is acceptable.

Is the radio playing through the loudspeakers?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - FAULT FOUND

VERIFICATION FAILED - Fault-tracing information

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Fault-tracing information

Attempt New Test - Checking fuses and power supply

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