Signal Too High / Signal Missing

Signal too high / Signal missing

Checking the component and wiring




- Ignition off
- Disconnect connector A from the phone module (PHM)
- Disconnect the connector for the Volvo On Call switch.

Hint: There is probably a short-circuit to supply voltage in one of the cables if the ON CALL/SOS switch lights too brightly. There is probably an open-circuit in the cables if the ON CALL/SOS switch does not light at all.

Check the cables for control module connector A for lighting the switch. Check for a short-circuit to supply voltage.
Check between:
- terminals #3 (#3) and #5 (#5)
- terminals #4 (#4) and #5 (#5).
Check the cables for lighting the switch. Check for an open-circuit.
Check between:
- control module connector A terminal #4 (#4) and the connector for switch terminal #4 (#16)
- control module connector A terminal #3 (#3) and the connector for switch terminal #3 (#15).
Try replacing the switch if the cables are OK.
Remedy as necessary.

Other information:
- For further information about the fuses and relays, see the Wiring Diagram
- Signal specification Signal Specification, Phone Module (PHM)
- Connecting the breakout box Connecting the Breakout Box, Phone Module (PHM)
- Location of components Location of Components, Phone Module (PHM)
- Phone Module (PHM) Phone Module (PHM)
- Switch Volvo On Call Removal and Replacement
- Checking wiring and terminals Checking Wiring and Terminals













Continue - Verification

-------------------------------------------------

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 the 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

-------------------------------------------------

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

------------------------

Attempt New Test - Checking the component and wiring

-------------------------------------------------