Part 2
Reading off diagnostic trouble codes (DTCs). Power seat (Continued)
Checking signal ground to data link connector (DLC)
- Ignition OFF.
Connect ohmmeter between data link connector (DLC) position 5 and ground.
The ohmmeter should read 0 ohms.
OK - Checking supply to break-out box/adapter
Not OK - Checking for an open-circuit
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Checking for an open-circuit
Check wiring between data link connector (DLC) position 5 and ground point for open-circuit in accordance with Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
For more information on the circuit see the respective Wiring diagrams for the car and model year being tested.
Continue - Verification
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Checking supply to break-out box/adapter
- Ignition ON.
- Volvo Scan Tool (ST) connected to data link connector (DLC).
- Disconnect adapter cable to Volvo Scan Tool (ST) from adapter box.
Connect a voltmeter between ground and the 25-pin connector position:
- 15 (data link connector (DLC) side)
- 20 (data link connector (DLC) side)
- 21 (data link connector (DLC) side)
- 22 (data link connector (DLC) side)
The voltmeter should read battery voltage in all cases.
OK - Checking power ground to break-out box/adapter
Not OK - Replace the adapter cable
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Replace the adapter cable
Try a new adapter cable to Volvo Scan Tool (ST)
Continue - Verification
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Checking power ground to break-out box/adapter
- Ignition OFF.
- Connect Volvo Scan Tool (ST) adapter cable to data link connector (DLC).
- Disconnect cable from adapter box.
Connect an ohmmeter between ground and 25-pin connector position:
- 23 (data link connector (DLC) side)
- 24 (data link connector (DLC) side)
- 25 (data link connector (DLC) side)
The ohmmeter should read 0 ohms in all cases.
OK - Checking signal ground
Not OK - Replace the adapter cable
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Checking signal ground
- Ignition OFF.
- Connect adapter cable to data link connector (DLC).
- Disconnect cable from adapter box.
Connect an ohmmeter between the 25-pin connector position 14 (data link connector (DLC) side) and ground.
The ohmmeter should read 0 ohms.
OK - Checking power supply to the Volvo Scan Tool (ST).
Not OK - Replace the adapter cable
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Checking power supply to the Volvo Scan Tool (ST).
- Ignition ON.
- Connect Scan Tool (ST) adapter cable to data link connector (DLC).
- Connect Volvo Scan Tool (ST) to the adapter box.
- Disconnect the 3-pin connector.
- Check that the adapter box power switch is turned ON.
Connect a voltmeter between the 3-pin connector and position:
- 1 (data link connector (DLC) side) and ground
- 3 (data link connector (DLC) side) and ground
The voltmeter should read 7-9 V between 1 and ground and battery voltage between 3 and ground.
OK - Checking ground to the Volvo Scan Tool (ST)
Not OK - Replace component
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Replace component
Try a new adapter box.
Continue - Verification
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Checking ground to the Volvo Scan Tool (ST)
- Ignition OFF.
- Connect the Volvo Scan Tool (ST) adapter cable to the data link connector (DLC).
- Disconnect 3-pin connector from Volvo Scan Tool (ST).
Connect an ohmmeter between the 3-pin connector position 2 (data link connector (DLC) side) and ground.
The ohmmeter should read 0 ohms.
OK - Checking power supply
Not OK - Replace component
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Checking power supply
- Ignition ON.
Connect Volvo Scan Tool (ST) to data link connector (DLC) on the car and turn on the power to the Scan Tool.
Check the Volvo Scan Tool (ST) display.
Is the display active?
Yes - No Fault Found
No - Replace component
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Replace component
Try a new Volvo Scan Tool (ST).
Continue - Verification
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Checking cabling
- Ignition OFF.
- Disconnect Volvo Scan Tool (ST).
- Disconnect 1/6 meter adapter cable.
Connect an ohmmeter between the 16-pin connector and the 25-pin connector in accordance with the table below
The ohmmeter should read 0 ohms for all readings.
OK - Checking short-circuit in adapter cable
Not OK - Replace the adapter cable
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Checking short-circuit in adapter cable
- Ignition OFF.
- Disconnect 1/6 meter adapter cable.
To determine if there is a short-circuit in the cable each position/lead must be checked for short-circuit to each other. The measurements must be carried out in the 16-pin connector.
Connect an ohmmeter between the 16-pin connector position:
- 1 and the other positions
- 2 and the other positions
Continue taking measurements in this way with the other positions.
The ohmmeter should read infinite resistance for all readings.
OK - Checking communication with another system
Not OK - Replace the adapter cable
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Checking communication with another system
- Ignition OFF.
- Connect Volvo Scan Tool (ST) with adapter and adapter cable.
- Connect Volvo Scan Tool (ST) to data link connector (DLC)) on the car and turn on the power to the Scan Tool.
- Ignition ON.
Try to establish contact with the Anti-lock braking system (ABS) by reading diagnostic trouble code (DTC).
Was contact established?
Yes - No Fault Found
No - Replace component
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Replace component
Try a new Volvo Scan Tool (ST) and adapter box
Press "Continue" when the fault has been remedied.
Continue - Verification
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Fault-tracing information
Fault-tracing communication problems is now finished.
Do you want to try establishing communication again?
Yes - Reading off diagnostic trouble codes (DTCs), power seat - right
No - Exit fault-tracing
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Checking supply voltage
Check supply voltage at the seat
- Ignition OFF.
- Disconnect 4-pin connector A from the control module.
Connect a voltmeter between connector A, position 1, and ground.
Voltmeter should read battery voltage.
OK - No Fault Found
Not OK - Checking fuse
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Checking fuse
- Ignition OFF.
- Remove the automatic fuses, 11/39 for the left seat and 11/40 for the right seat.
Use an ohmmeter to check the automatic fuses are intact.
Is the fuse intact?
Yes - Checking +30 supply before the fuse
No - Replace component
------------------------
Replace component
Replace with new fuse and then fault-tracing in accordance with Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Verification
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Checking +30 supply before the fuse
- Ignition OFF.
Connect a voltmeter between the right/rear socket for fuses 39 and 40 and ground.
Voltmeter should read battery voltage.
OK - Checking +30-supply after fuse
Not OK - Checking for an open-circuit
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Checking for an open-circuit
Check cable between battery positive terminal and fuse holder for open-circuit in accordance with Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Verification
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Checking +30-supply after fuse
- Ignition OFF.
- Disconnect 4-pin connector A from the seat control module.
Connect an ohmmeter between connector A, position 1 (green/red wire) and the fuse socket.
The ohmmeter should read 0 ohms.
OK - Check ground lead
Not OK - Checking for an open-circuit, contact resistance and oxidation
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Checking for an open-circuit, contact resistance and oxidation
Check cable between battery and the 4-pin connector, position A:1, for open-circuit in accordance with Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault and contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. See appropriate Wiring diagram for the model year of the car.
Continue - Verification
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Check ground lead
- Ignition OFF.
- Disconnect 4-pin connector A.
Connect an ohmmeter between the 4-pin connector A, position 3 (black lead) and ground.
The ohmmeter should read approx. 0 ohms.
OK - Replace component
Not OK - Checking for an open-circuit
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Replace component
+30 supply and control module ground cable have no faults.
Try a new control module according to Control module, replace.
Continue - Verification
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Checking for an open-circuit
Check lead between 4-pin connector A, position 3 (black lead), and ground point 31/47 for open-circuit in accordance with Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Verification
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Verification
Hint: After carrying out the repair, check that the fault has been remedied as follows.
- Ignition OFF.
- Disconnect 4-pin connector A from the control module.
Connect a voltmeter between positions 1 and 3 in connector A.
Voltmeter should read battery voltage.
OK - Troubleshooting procedure complete
Not OK - Fault-tracing information
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Fault-tracing information
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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Replacing defective control module
Fault tracing information
It is important to observe the following before proceeding:
- All tests for the symptom in question must have been carried out.
- No faults on components, connectors or leads have been found.
Have all tests been carried out without finding any faults?
YES - Replacing defective control module
NO - ANOTHER TEST
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Replacing defective control module
- Try a new control module according to Control module, replace.
Continue - FAULT FOUND
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Preparations
The power seat is available in two versions, with or without memory function.
Only power seats with memory function have diagnostic functions.
Does the right-hand side power seat have the memory function?
Yes - Reading off diagnostic trouble codes (DTCs), power seat - right
No - Exit fault-tracing procedure
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Reading off diagnostic trouble codes (DTCs), power seat - right
- Ignition on.
Click on the VST symbol to activate the reading off of diagnostic trouble codes (DTCs).
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