Signal Too High/Signal Missing
Signal too high / Signal missing
Checking structure week
- Ignition on
Read out the vehicle's structure week by clicking on the symbol for VCT2000.
1. Vehicles with structure week up to and incl. 200445, that is, year 2004 week 45.
2. Vehicles with structure week from and incl. 200446, that is, year 2004 week 46.
Select one of the above alternatives.
1 - Checking components and wiring
2 - Checking components and wiring
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Checking components and wiring
- Ignition off
- Disconnect connector A for the phone module (PHM).
- Disconnect the handset's connector.
Check the speaker signal's cable on the control module's connector A for short-circuit to voltage.
Check between:
- #20 (#20) and #7 (#7).
- #20 (#20) and #5 (#5).
Check the speaker signal's cable for open circuit.
Measure between the control module's connector A #20 (#20) and the handset's connector #2 (#22).
Check the connectors for loose connections, damaged or bent pins as well as oxidation.
If no malfunction was found on the cable, try replacing the handset.
Remedy as necessary.
Other information:
- For further information about the fuses and relays, see wiring diagram.
- Connecting the breakout box Connecting the Breakout Box, Phone Module (PHM)
- Signal specification Signal Specification, Phone Module (PHM)
- Location of components Locations
- Handset, replacing Handset, Replacing
- Checking wiring and terminals Checking Wiring and Terminals
Select Continue.
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
- Activate the carphone.
Make a call so that both the handset and the hands-free system are used. See instruction manual.
Ignition off.
Ignition on.
Read off the diagnostic trouble codes (DTCs).
Check that the relevant diagnostic trouble code (DTC) has switched status from permanent to intermittent fault.
Has the status of the diagnostic trouble code (DTC) changed?
Yes - Troubleshooting procedure complete
No - Troubleshooting information
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Troubleshooting 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 - Checking components and wiring
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Checking components and wiring
Signal too high or signal missing
Checking components and wiring
Check the signal cable for the microphone between phone module (PHM) connector B terminal #14 (#56) and handset connector terminal #2 (#22). Check for a short-circuit to supply voltage.
Check the signal cable for the microphone between phone module (PHM) connector B terminal #14 (#56) and handset connector terminal #2 (#22). Check for an open-circuit.
Check the connectors for loose connections, damaged or bent terminal pins and oxidation.
Try replacing the carphone handset if no fault is found in the wiring.
Remedy as necessary.
Other information:
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box, Phone Module (PHM)
- For information about signals and connectors, see Signal specification Signal Specification, Phone Module (PHM)
- To access or replace the control module, see Phone module (PHM), replacing Phone Module (PHM), Replacing
- To access or replace the handset, see Handset, replacing Handset, Replacing
- Checking wiring and terminals Checking Wiring and Terminals.
Select Continue.
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
- Switch on the carphone.
Make a call so that both the handset and the hands-free system are used. See instruction manual.
Ignition off.
Ignition on.
Read off the diagnostic trouble codes (DTCs).
Check that the relevant diagnostic trouble code (DTC) has switched status from permanent to intermittent fault.
Has the status of the diagnostic trouble code (DTC) changed?
Yes - Troubleshooting procedure complete
No - Fault-tracing information
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Fault-tracing information
Information
Attempt New Test - Checking components and wiring
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