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Home >> Volvo >> 1998 >> C70 Convertible L5-2.4L Turbo VIN 56 B5254T >> Repair and Diagnosis >> Body and Frame >> Roof and Associated Components >> Convertible Top >> Testing and Inspection >> Component Tests and General Diagnostics >> Checking Communication With The Convertible Top Control Module >> Checking Communication With The Convertible Top Control Module

Checking Communication With The Convertible Top Control Module






Checking communication with the convertible top control module

Checking the power supply




- Volvo Scan Tool (ST) connected to the data link connector (DLC).
- Ignition on.
Power up the Volvo Scan Tool (ST) and check that the display lights.





Does the display light?

Yes - Checking communication with the ABS system

No - Checking the Volvo Scan Tool (ST)

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Checking the Volvo Scan Tool (ST)
Check the power supply for the Volvo Scan Tool (ST) and the data link connector (DLC).

Select Continue when the fault has been remedied.

Continue - DONE

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Checking communication with the ABS system




- Ignition off.
- Volvo Scan Tool (ST) connected to the data link connector (DLC).
- Ignition on.
Try to establish communication with the ABS system.





Has communication with the ABS system been established?

Yes - Checking the communication cable for the convertible system

No - Checking the communication cable for the ABS system

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Checking the communication cable for the ABS system
- If there is no communication with the ABS system, there is a fault in the circuit between the connected control modules in the circuit and the data link connector (DLC).
- Check the data link connector (DLC) for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
- Check data link connector (DLC) connector 7 and the connected control modules for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault , short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault and for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

If no faults are found, check the Volvo Scan Tool (ST) according to Service Manual Volvo Scan Tool (ST).
Remedy as necessary.













Other information:
- To access / replace the control module, see Replacing the control module Service and Repair.

Select Continue when the fault has been remedied.

Continue - Checking the communication cable for the ABS system, continued

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Checking the communication cable for the ABS system, continued




- Ignition on.
- Check data link connector (DLC) 7 and ground for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.

Other information:
- The voltage on the communication cable must be 9-11 V with the ignition on. This applies if the fault-tracing instrument is not connected.
- To access / replace the control module, see Replacing the control module Service and Repair.









Select Continue when the fault has been remedied.

Continue - Verification

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Checking the communication cable for the convertible system








- Ignition off.
- Check that fuse 29 is intact. If the fuse is blown, check the circuit after the fuse for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
- Check control module connector A for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
- Disconnect the control module connector.

Hint: For information about the circuit after the fuse, see the appropriate Wiring diagram. Replace the fuse.

Connect an ohmmeter in order between:
Control module connector A7 and fuse 29.
Data link connector (DLC) 7 and control module connector A23.
Check for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.













Other information:
- For other signals, see Convertible system signal specification Convertible System Signal Specification.
- To access / replace the control module, see Replacing the control module Service and Repair.
- To connect the breakout box, see Connecting the convertible control unit breakout box Connecting the Breakout Box.
- To access / replace the fuses, see Relays in passenger compartment central electrical unit, Convertible Relays in Passenger Compartment Central Electrical Unit.

Was an open-circuit found?

Yes - Verification

No - Checking the supply to the control module

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Checking the supply to the control module




- Ignition on.
Connect a voltmeter between B5 and B6 and between B7 and B8. Check for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
If no faults are found, check automatic fuses 41 and 42 for the convertible system.
Remedy as necessary.

Other information:
- If there is no open-circuit, the voltage should be the same as battery voltage.
- To access / replace the fuses, see Relays in passenger compartment central electrical unit, Convertible Relays in Passenger Compartment Central Electrical Unit.









Were any faults found?

Yes - Verification

No - Connecting the breakout box
Connecting the breakout box

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Connecting the breakout box





Checking the ground terminals
981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428 981 3194 Replaced by 9511495 981 3194 Replaced by 951 1495 951 1496 Adapter 8-14-pin 951 1496 Adapter 8-14-Pin
Connecting the breakout box




Information

Connecting up the Test box





Is the test box connected to the control module?

Yes - CONNECTED

No - NOT CONNECTED

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CONNECTED - No Fault Found

NOT CONNECTED - Connecting the breakout box

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Connecting the breakout box
Connect the breakout box according to Connecting the convertible control unit breakout box Connecting the Breakout Box.






Continue - Checking the ground terminal

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Checking the ground terminal








- Ignition off
- Control module disconnected.
- Switch off all equipment that takes power from the battery (courtesy lighting, radio etc).
Connect an ohmmeter between the battery negative terminal and 5 on the breakout box and between the battery negative terminal and 7 on the breakout box.









The ohmmeter should read approximately 0 ohms.

OK - Return to the fault-tracing procedure where it was interrupted.
No Fault Found

Not OK - Checking for an open-circuit, contact resistance and oxidation

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Checking for an open-circuit, contact resistance and oxidation




- Ignition off.
Check ground terminal 31/48 and the wiring connected to it. Check for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Check for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.





Select Continue when the fault has been remedied.

Continue - Verification

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Verification




Verification

Note! After carrying out the repair, check that the fault has been remedied.








- Ignition off
- Control module disconnected
- Switch off all equipment that takes power from the battery (courtesy lighting, radio etc.).
Connect an ohmmeter between the battery negative terminal and terminal 5 on the breakout box.









The ohmmeter should read approximately 0 ohms

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - FAULT FOUND

VERIFICATION FAILED - Fault-tracing information

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Fault-tracing information




Information

Fault-tracing information
The fault should be diagnosed and remedied. Since this is not the case the fault-tracing process has failed.
Complete the fault-tracing for those fault or try again.

Do you want to terminate fault-tracing at this time?

Yes - Exit fault-tracing

No - Attempt New Test

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Attempt New Test - Connecting the breakout box

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No Fault Found - Verification

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Verification




Verification

Note! After carrying out the repair, check that the fault has been remedied.








- Ignition off.
- Reinstall components, reconnect connectors etc.
- Speed < 4 km/h.
- Ignition on.
Try to establish communication with the convertible top control module by:
Reading off the status of the front lock micro-switch





Is communication with the convertible top control module system working?

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 - Checking the power supply

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