Too Low
Too low
Checking status
- Ignition off.
Read off battery voltage.
Move the seat with the control buttons.
Battery voltage must be over 11 V.
OK - Too low. Intermittent fault
Not OK - Intermittent fault
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Intermittent fault
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
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
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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.
Press "Continue" when the fault has been remedied.
Continue - DONE
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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.
Press "Continue" when the fault has been remedied.
Continue - DONE
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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 Wiring diagram 850 for the model year of the car.
Press "Continue" when the fault has been remedied.
Continue - DONE
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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 Control Module.
Press "Continue" when the fault has been remedied.
Continue - DONE
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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.
Press "Continue" when the fault has been remedied.
Continue - DONE
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DONE - Verification
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Verification
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 - VERIFIED
Not OK - 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 - Check supply voltage at the seat
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No Fault Found - No Fault Found
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Too low. Intermittent fault
Checking wiring and connectors
Check the 4-pin connector A for contact resistance and oxidation in accordance with Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Check the 24/14 connector (engine compartment harness - left threshold plate harness) for contact resistance and oxidation in accordance with Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults. See Wiring diagrams 850 for the model year in question.
Check wiring between control module, position A:1 (green/red lead), and the battery positive terminal for intermittent open-circuit in accordance with Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Press "Continue" when the fault has been remedied.
Continue - Fault-tracing information
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Fault-tracing information
Information
Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).
Do you want to view the information again?
Yes - Attempt New Test
No - FAULT FOUND
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Attempt New Test - Checking status
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