Fault-Tracing

Fault-tracing

Checking the component and wiring
Phone module (PHM) receives a directly connected signal from Supplemental restraint system module (SRS) that informs if the vehicle has been involved in a collision. The signal is pulse width modulated and normally has a frequency of 10 Hz. In the event of a collision, the signal frequency increases to 250 Hz ( ± 10%).
Check that the status of the Supplemental restraint system module (SRS) is approved. Any diagnostic trouble codes stored in the Supplemental restraint system module (SRS) are to be rectified first.
Connect the adapter cable and breakout box to Phone module (PHM) connector C1.
- 951 1463 Adapter 22-16-14 pin 951 1463 Adapter 22-16-14 Pin
- 951 1428 Breakout box 951 1428 Breakout Box
Check that the pulse width modulated signal is between 9 and 11 Hz by reading the frequency between terminals #C1:17 and #C1:6.
If the cable is damaged, replace it.

Other information
- Signal specification Signal Description, Phone Module (PHM), Later Version
- Connecting the breakout box Connecting Breakout Box, Phone Module (PHM), Later Version
- Location of components Phone Module (PHM), Later Version
- Phone Module (PHM) Phone Module (PHM)





Was a fault detected?

Yes - Verification

No - Troubleshooting complete for this DTC

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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 - Troubleshooting complete for this DTC

No - Information

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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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