Fault Tracing Information

DDA. Fault-tracing information

Condition
No diagnostic trouble codes (DTCs)
The fault is permanent.

Possible source
- Open-circuit, short-circuit to ground or short-circuit to supply voltage in cable to data link connector (DLC).
- Open-circuit on data link connector (DLC) power supply, power ground or signal ground.
- Malfunction on Volvo Scan Tool (ST), cables, contacts or adapter.
- Control module diagnostics disabled.

NOTE: If communications problems occur when starting engine, try connecting a battery charger or additional battery.

Fault symptom(s)
- No communication with power seat.
- Fault-tracing begins at DDB.





DDB. Checking communication

DDB1: Checking the power seat functions
Try to operate the seat with the control buttons.

Are power seat controls working?

Yes:
- DDB2

No:
- Carry out next fault-tracing in accordance with Symptom Table.

DDB2: Checking version
Does the car have a chassis number in the range 267000 - 273594 (4-door) or in the range 171000 - 177545 (5-door)?

Yes:
- DDB3

No:
- DDB4





DDB3: Replace component
- Cars in this chassis number range have the control module diagnostics function disabled. The control module operates normally when the seat is being operated but cannot be used for communication.
- Replace with new control module. Control module,Service and Repair
- In addition the diagnostics lead might not be connected up to the control module although the lead itself is there.
- Connect the diagnostics lead to position 4 in the connector A to enable communication.

Then continue with:
- DDB11

DDB4: Checking power supply and the Volvo Scan Tool (ST)
Carry out fault-tracing for:
- Power supply, power ground and signal ground to data link connector (DLC)
- Volvo Scan Tool (ST)

Was a fault detected?

Yes:
- DDB11

No:
- DDB5





DDB5: Checking communication with another system
- Ignition on.
- Volvo Scan Tool (ST) connected to data link connector (DLC).
- Try to establish contact with the Anti-lock braking system (ABS) by reading diagnostic trouble code (DTC).

Was contact established?

Yes:
- DDB6

No:
- DDB7





DDB6: Checking for an open-circuit
Check wiring between data link connector (DLC) position 7 and control module 4-pin connector A, position 4, for open-circuit Component Tests and General Diagnostics

Then continue with:
- DDB11





DDB7: Checking diagnostics wiring to data link connector (DLC)
- Ignition OFF.
- Disconnect Volvo Scan Tool (ST) from data link connector (DLC).
- Connect an ohmmeter between data link connector (DLC) position 7 and control module 4-pin connector A, position 4.

The ohmmeter should read 0 ohm.

If reading is OK:
- DDB8

If reading is incorrect:
- DD86





DDB8: Checking communications wiring
- Ignition OFF.
- Connect seat control module.
- Ignition on.
- Connect a voltmeter between data link connector (DLC) position 7 and ground.

The voltmeter should read approx. 9-11 V.

If reading is OK:
- Fault not found

If value is lower:
- DDB9

If value is higher:
- DDB10





DDB9: Checking for a short-circuit to ground
Check cable between data link connector (DLC) position 7 and control modules connected to this cable for a short-circuit to ground Component Tests and General Diagnostics

Then continue with:
- DDB11





DDB10: Checking for short-circuit to supply
Check cable between data link connector (DLC) terminal 7 and control modules connected to this cable for a short-circuit to supply voltage Component Tests and General Diagnostics

Then continue with:
- DDB11





DDB11: Verification
Hint: After carrying out the repair, check that the fault has been remedied as follows.
- Ignition OFF.
- Reinstall components, connectors etc.
- Try to establish contact with the power seat control module by reading diagnostic trouble code (DTC).

Was contact established?

Yes:
- Fault corrected

No:
- DDB12

DDB12: Fault-tracing information
The verification result shows that the fault persists.
Do you want to exit fault-tracing?

Yes:
- Fault not corrected

No:
- DDB2