Signal Too Low. Permanent Fault

Signal too low. Permanent fault

Volvo Scan Tool (ST)
- Ignition on
- Connect the Volvo Scan Tool (ST)
- Print the comment sheet. See Diagnostic list for convertible tops Diagnostic List For Convertible Tops.
Read off the status of the potentiometer for the convertible top.

Other information:
- To connect the breakout box, see Connecting the convertible control unit breakout box Connecting the Breakout Box
- For other values, see Opening and closing the convertible top Opening and Closing the Convertible Top
- To access or replace the potentiometer for the convertible top, see Replacing the potentiometer Replacing the Potentiometer.

Are these values correct?

Yes - Verification

No - Checking the connectors and cables

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Checking the connectors and cables




- Ignition off
- Check control module connector C and the potentiometer connector. Check for a short-circuit to ground. See Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Check for contact resistance and oxidation. See Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Connect an ohmmeter between control module connector C5 and ground.
Check for a short-circuit to ground. See Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Connect an ohmmeter between control module connector C6 and ground.
Take the same reading as above.
Connect an ohmmeter between control module connector C7 and ground.
Take the same reading as above.
Connect an ohmmeter between control module connector C5 and potentiometer connector 1.
Connect an ohmmeter between control module connector C6 and potentiometer connector 2.
Check for an open-circuit. See Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Connect an ohmmeter between control module connector C7 and potentiometer connector 3.
Take the same reading as above.
If no faults are found, try a new potentiometer.
Remedy as necessary.













Other information:
- To connect the breakout box, see Connecting the convertible control unit breakout box Connecting the Breakout Box
- For the comment sheet, see Diagnostic list for convertible tops Diagnostic List For Convertible Tops
- For other values, see Opening and closing the convertible top Opening and Closing the Convertible Top
- To access or replace the potentiometer for the convertible top, see Replacing the potentiometer Replacing the Potentiometer
- To access and replace the control module see Replacing the control module Service and Repair.

Select Continue when the fault has been remedied.

Continue - Calibrating the convertible system

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Calibrating the convertible system
It is important that the potentiometer values are calibrated and programmed into the control module if the potentiometer has been replaced.
Carry out programming and calibration in Volvo Scan Tool (ST).

Select Continue when the fault has been remedied.

Continue - Verification

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Verification




Verification

Hint: After the repair it is necessary to check that the fault has been rectified.








- Ignition off
- Connect the connectors, install the components, etc.
- Ignition on
- Apply parking brake
- Close the luggage compartment lid
- Speed < 4km/h.
Operate the control switch to move the convertible top.
Move the convertible top to its end positions.

Does the convertible top work?

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 - Volvo Scan Tool (ST)

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