Fault-Tracing Information

Fault-tracing

Checking the wiring
The signal for the lighting for the Volvo On Call buttons is pulse width modulated. To enable measuring and checking if there is a problem on the lead, pulse-width modulation (lighting intensity) needs to be set to a specific value.
- To check whether the fault is due to an open circuit, or short-circuit to ground, the value 10% must be set.
- To check if the signal has a short-circuit to voltage, the value 0% must be set.
Click on VCT2000 to set the desired value on the signal.

Open-circuit or short-circuit to ground
- Check the voltage between terminal #C1:3 and #C1:6 to check the SOS button.
Check the voltage between terminal #C1:4 and #C1:6 to check the SOS On Call button.
- If the value is lower than 3 V, the cable has a short-circuit to ground.
- If the measured value is greater than 8 V, this means that the cable is disconnected and that the circuit is open.
- Check the wiring and connectors

short-circuit to voltage
- Check the voltage between terminal #C1:3 and #C1:6 to check the SOS button.
Check the voltage between terminal #C1:4 and #C1:6 to check the SOS On Call button.
- If the value is greater than 8 V, the cable has a short-circuit to voltage.
- Check the wiring and connectors
Remedy as necessary.

Other information
- Signal specification Signal Specification, Phone Module (PHM)
- Location of components Location of Components, Phone Module (PHM)
- Connecting the breakout box Connecting the Breakout Box, Phone Module (PHM)
- Checking wiring and terminals Checking Wiring and Terminals. Permanent Faults









Was a fault detected?

Yes - Verification

No - Checking the component

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Checking the component
Change the switches for Volvo On Call. Check that the lighting in the switches works by altering the lighting intensity on the buttons.

Other information
- Location of components Location of Components, Phone Module (PHM)
- Switch Volvo On Call Removal and Replacement





Does the lighting work?

Yes - Verification

No - Information

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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 the carphone by making a call.
Read diagnostic trouble codes by clicking the VCT2000 symbol.
Check that the current DTC has disappeared or changed status from permanent to intermittent fault.





Is the carphone working?

Yes - FAULT FOUND

No - No Fault Found

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No Fault Found - Information

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Information

Attempt New Test - Checking the wiring

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