Too Low
Too low
Checking status
- Ignition off.
Read off the 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
Checking supply voltage at seat
- Ignition off.
- Disconnect the 4-pin connector A from the control module.
Connect a voltmeter between connector A, terminal 1, and ground.
The voltmeter should read battery voltage.
OK - No Fault Found
Not OK - Checking fuses
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Checking fuses
Checking fuses
Checking fuses
- Ignition off.
- Remove automatic fuse 11/39 for the left seat and automatic fuse 11/40 for the right seat.
Connect an ohmmeter and check that the automatic fuse is intact.
Is the fuse intact?
Yes - Checking the +30-supply before the fuse
No - Replacing the component
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Replacing the component
Replace with a new fuse. Fault-trace according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - DONE
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Checking the +30-supply before the fuse
- Ignition off.
Connect a voltmeter between the right / rear socket at fuses 39 and 40 and ground.
The voltmeter should read battery voltage.
OK - Checking the +30-supply after the fuse
Not OK - Checking for an open-circuit
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Checking for an open-circuit
Check the cable between the battery positive terminal and the fuse holder for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - DONE
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Checking the +30-supply after the fuse
- Ignition off.
- Disconnect the 4-pin connector A from the seat control module.
Connect an ohmmeter between connector A terminal 1 (green / red cable) and the fuse socket.
The ohmmeter should read 0 ohms.
OK - Checking 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 the cable between the battery and the 4-pin connector terminal A:1 for an open-circuit according to 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 relevant model year.
Continue - DONE
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Checking ground lead
- Ignition off.
- 4-pin connector A disconnected.
Connect an ohmmeter between the 4-pin connector A terminal 3 (black cable) and ground.
The ohmmeter should read approximately 0 ohms.
OK - Replacing the component
Not OK - Checking for an open-circuit
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Replacing the component
the +30-supply and the ground cable for the control module are fault-free.
Try a new control module according to Control module Control Module.
Continue - DONE
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Checking for an open-circuit
Check the cable between 4-pin connector A terminal 3 and (black cable) and ground terminal 31/47 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
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 - Checking supply voltage at 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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