Checking Radio Reception, Digital Radio
Checking radio reception, digital radio
Fault-tracing information
Symptom troubleshooting for the digital radio is structured according to the following list. It is possibe to cancel troubleshooting at each step if the problem is found.
1. Reading off diagnostic trouble codes (DTCs).
2. Checking wiring and components.
3. Checking aerial amplifier radio.
4. Checking antennas.
5. Checking the control module.
The task of the Digital Audio Broadcast Module (DABM) is to receive terrestrial digital radio signals. The Digital Audio Broadcast Module (DABM) uses two aerials, one for VHF (Very High Frequency) Band 3 and one for Band L. See the component position for more information on where the components are located.
The Digital Audio Broadcast Module (DABM) must be within the transmitting station's coverage area to work optimally. See Design and Function for more information.
Causes of interference can be:
- The vehicle is outside the transmitting station's coverage area for digital radio reception.
- Weather conditions.
- Loose connections.
- Internal fault in the aerial amplifier radio.
- Internal fault in the aerials.
- Internal fault in the Digital Audio Broadcast Module (DABM).
Continue - Checking the wiring and connectors
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Checking the wiring and connectors
Check that Diagnostic trouble codes (DTCs) have been stored for the Digital Audio Broadcast Module (DABM) and follow the instructions that each DTC refers to.
Read off the diagnostic trouble codes (DTCs) by clicking on the VCT2000 symbol.
If no DTCs are stored for the Digital Audio Broadcast Module (DABM), continue fault tracing as follows:
1. Check fuses.
2. Checking the voltage and ground terminal, Digital Audio Broadcast Module (DABM) Checking The Voltage/Ground Terminal, Digital Audio Broadcast Module (DABM)
Other information:
Component location, Remote Digital Audio Receiver (DABM) Component Location, Remote Digital Audio Receiver (DABM)
Signal specification, Digital Audio Broadcast Module (DABM) Signal Specification, Digital Audio Broadcast Module (DABM)
Was the fault found?
Yes - FAULT FOUND
No - Checking aerial amplifier radio
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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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VERIFICATION FAILED - Fault-tracing information
VERIFIED - FAULT FOUND
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Fault-tracing information
Information
Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.
Do you want to exit fault-tracing?
Yes - Exit fault-tracing
No - Attempt New Test
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Attempt New Test - Fault-tracing information
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Checking aerial amplifier radio
The aerial signals for the reception of AM, FM and digital radio pass the aerial amplifier radio before being transmitted on to the receiving control module.
1. Check the voltage supply to the aerial amplifier radio.
2. Check that the radio's AM and FM reception works properly to determine any errors in the aerial amplifier radio.
3. See local coverage map for digital radio coverage areas of the transmitting stations.
4. If possible, test drive and listen to the digital radio reception. A condition of being able to use the test drive as reference is that previous tests have been performed on the same stretch and that the digital radio reception worked as it should.
Other information
- Signal specification, antenna amplifier, radio Signal Specification, Antenna Amplifier, Radio
Was the fault found?
Yes - FAULT FOUND
No - Checking antennas
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Checking antennas
Perform a visual check of the aerials and ensure that they are intact and not damaged. Poor radio reception may be because the antenna connectors are not connected to the window antennas. If there is no radio reception, this may be because the antenna cable is not connected to the antenna amplifier.
If any of the aerials are damaged, replace the aerial.
If no faults are found on the aerials, replace the aerial amplifier radio.
Other information:
Component location, Remote Digital Audio Receiver (DABM) Component Location, Remote Digital Audio Receiver (DABM)
Antenna amplifier, radio Service and Repair
Was the fault found?
Yes - FAULT FOUND
No - Checking the Digital Audio Broadcast Module (DABM)
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Checking the Digital Audio Broadcast Module (DABM)
1. Update the software in the event of sound problems.
2. If the problem remains after new software has been downloaded, see special mechanical instruction. Replace control module. Download new software to the Digital Audio Broadcast Module (DABM).
3. Read off diagnostic trouble codes (DTCs).
4. Erase diagnostic trouble codes (DTCs).
Other information
Continue - Verification
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