Symptom Related Diagnostic Procedures
Checking the seat
Fault-tracing information
Each seat motor has a Hall sensor which detects the present position of the seat. When one of the stepper motors for the seat is run, the control module counts the number of pulses from the Hall sensor. The Hall sensor counts the number of revolutions made by the motor by detecting a magnet on the motor shaft. This creates a pulse for each revolution of the motor. When a seat position is stored, information about the number of counted pulses from each motor is saved in a memory.
If no Hall sensor pulse is detected when the engine is activated and running, the seat will not move to the programmed seat position when one of the memory buttons is pressed.
Possible fault causes may be:
- Damaged Hall sensor
- The signal cable to the Hall sensor short-circuited to ground or supply
- Open-circuit in the signal cable to the Hall sensor.
Continue - Checking the component
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Checking the component
- Ignition on.
Motor 1 controls the front-rear adjustment of the seat.
Check that the power seat module (PSM) is receiving the signal from the Hall sensor. Operate seat motor 1. Check whether the value counts up or down as the seat is moved in each direction.
Read off the value by clicking on the VCT2000 symbol.
Is the function OK?
Yes - Checking the component
No - Checking the wiring and component
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Checking the wiring and component
Left-hand drive vehicles
Check the cable between power seat module (PSM) terminal #B11 (#11) and Hall sensor 1. Check for a short-circuit to supply voltage. Check for a short-circuit to ground. Check for an open-circuit.
Check the cable between power seat module (PSM) terminal #B7 (#7) and Hall sensor 1. Check for a short-circuit to supply voltage. Check for a short-circuit to ground. Check for an open-circuit.
Right-hand drive vehicles
Check the cable between power seat module (PSM) terminal #B10 (#10) and Hall sensor 1. Check for a short-circuit to supply voltage. Check for a short-circuit to ground. Check for an open-circuit.
Check the cable between power seat module (PSM) terminal #B14 (#14) and Hall sensor 1. Check for a short-circuit to supply voltage. Check for a short-circuit to ground. Check for an open-circuit.
Other information:
- Installing the breakout box, power seat module (PSM) Installing the Breakout Box, Power Seat Module (PSM)
- For left-hand drive cars, see Signal specification, L.H.D Signal Description, Power Seat Module (PSM)
- For right-hand drive cars, see Signal specification, R.H.D Signal Description, Power Seat Module (PSM)
- Electric motor height adjustment Electric Motor Height Adjustment
- Electric motor front-rear adjustment Electric Motor Front-Rear Adjustment
- Checking wiring and terminals Checking Wiring and Terminals
Remedy as necessary
Continue - Verification
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Checking the component
- Ignition on.
Motor 2 controls the backrest rake.
Check that the power seat module (PSM) is receiving the signal from the Hall sensor. Operate seat motor 2. Check whether the value counts up or down as the seat is moved in each direction.
Read off the value by clicking on the VCT2000 symbol.
Is the function OK?
Yes - Checking the component
No - Checking the wiring and component
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Checking the wiring and component
Left-hand drive vehicles
Check the cable between power seat module (PSM) terminal #B12 (#12) and Hall sensor 2. Check for a short-circuit to supply voltage. Check for a short-circuit to ground. Check for an open-circuit.
Check the cable between power seat module (PSM) terminal #B8 (#8) and Hall sensor 2. Check for a short-circuit to supply voltage. Check for a short-circuit to ground. Check for an open-circuit.
Right-hand drive vehicles
Check the cable between power seat module (PSM) terminal #B9 (#9) and Hall sensor 2. Check for a short-circuit to supply voltage. Check for a short-circuit to ground. Check for an open-circuit.
Check the cable between power seat module (PSM) terminal #B13 (#13) and Hall sensor 2. Check for a short-circuit to supply voltage. Check for a short-circuit to ground. Check for an open-circuit.
Other information:
- Installing the breakout box, power seat module (PSM) Installing the Breakout Box, Power Seat Module (PSM)
- For left-hand drive cars, see Signal specification, L.H.D Signal Description, Power Seat Module (PSM)
- For right-hand drive cars, see Signal specification, R.H.D Signal Description, Power Seat Module (PSM)
- Electric motor, backrest rake Electric Motor, Backrest Rake Electric motor, backrest rake Electric Motor, Backrest Rake
- Checking wiring and terminals Checking Wiring and Terminals
Remedy as necessary
Continue - Verification
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Checking the component
- Ignition on.
Motor 3 controls the height adjustment of the seat.
Check that the power seat module (PSM) is receiving the signal from the Hall sensor. Operate seat motor 3. Check whether the value counts up or down as the seat is moved in each direction.
Read off the value by clicking on the VCT2000 symbol.
Is the function OK?
Yes - Checking the component
No - Checking the wiring and component
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Checking the wiring and component
Left-hand drive vehicles
Check the cable between power seat module (PSM) terminal #B13 (#13) and Hall sensor 3. Check for a short-circuit to supply voltage. Check for a short-circuit to ground. Check for an open-circuit.
Check the cable between power seat module (PSM) terminal #B9 (#9) and Hall sensor 3. Check for a short-circuit to supply voltage. Check for a short-circuit to ground. Check for an open-circuit.
Right-hand drive vehicles
Check the cable between power seat module (PSM) terminal #B8 (#8) and Hall sensor 3. Check for a short-circuit to supply voltage. Check for a short-circuit to ground. Check for an open-circuit.
Check the cable between power seat module (PSM) terminal #B12 (#12) and Hall sensor 3. Check for a short-circuit to supply voltage. Check for a short-circuit to ground. Check for an open-circuit.
Other information:
- Installing the breakout box, power seat module (PSM) Installing the Breakout Box, Power Seat Module (PSM)
- For left-hand drive cars, see Signal specification, L.H.D Signal Description, Power Seat Module (PSM)
- For right-hand drive cars, see Signal specification, R.H.D Signal Description, Power Seat Module (PSM)
- Electric motor height adjustment Electric Motor Height Adjustment
- Electric motor front-rear adjustment Electric Motor Front-Rear Adjustment
- Checking wiring and terminals Checking Wiring and Terminals
Remedy as necessary
Continue - Verification
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Checking the component
- Ignition on.
Motor 4 controls the angle of the seat.
Check that the power seat module (PSM) is receiving the signal from the Hall sensor. Operate seat motor 4. Check whether the value counts up or down as the seat is moved in each direction.
Read off the value by clicking on the VCT2000 symbol.
Is the function OK?
Yes - DONE
No - Checking the wiring and component
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Checking the wiring and component
Left-hand drive vehicles
Check the cable between power seat module (PSM) terminal #B14 (#14) and Hall sensor 4. Check for a short-circuit to supply voltage. Check for a short-circuit to ground. Check for an open-circuit.
Check the cable between power seat module (PSM) terminal #B10 (#10) and Hall sensor 4. Check for a short-circuit to supply voltage. Check for a short-circuit to ground. Check for an open-circuit.
Right-hand drive vehicles
Check the cable between power seat module (PSM) terminal #B7 (#7) and Hall sensor 4. Check for a short-circuit to supply voltage. Check for a short-circuit to ground. Check for an open-circuit.
Check the cable between power seat module (PSM) terminal #B11 (#11) and Hall sensor 4. Check for a short-circuit to supply voltage. Check for a short-circuit to ground. Check for an open-circuit.
Other information:
- Installing the breakout box, power seat module (PSM) Installing the Breakout Box, Power Seat Module (PSM)
- For left-hand drive cars, see Signal specification, L.H.D Signal Description, Power Seat Module (PSM)
- For right-hand drive cars, see Signal specification, R.H.D Signal Description, Power Seat Module (PSM)
- Electric motor height adjustment Electric Motor Height Adjustment
- Electric motor front-rear adjustment Electric Motor Front-Rear Adjustment
- Checking wiring and terminals Checking Wiring and Terminals
Remedy as necessary
Continue - Verification
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Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off
- Reinstall the connectors, components etc.
- Ignition on.
Read off the value by clicking on the VCT2000 symbol.
Check that the power seat module (PSM) is receiving the signal from the Hall sensor. Operate seat motor 1. Check whether the value counts up or down as the seat is moved in each direction.
Also check that the seat is moved to a programmed position by pressing one of the memory buttons. It may be necessary to program in a new seat position first. This is done by pressing MEM at the same time as one of the memory buttons 1, 2 or 3.
Is the function OK?
Yes - FAULT FOUND
No - Fault-tracing information
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Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off
- Reinstall the connectors, components etc.
- Ignition on.
Read off the value by clicking on the VCT2000 symbol.
Check that the power seat module (PSM) is receiving the signal from the Hall sensor. Operate seat motor 2. Check whether the value counts up or down as the seat is moved in each direction.
Also check that the seat is moved to a programmed position by pressing one of the memory buttons. It may be necessary to program in a new seat position first. This is done by pressing MEM at the same time as one of the memory buttons 1, 2 or 3.
Is the function OK?
Yes - FAULT FOUND
No - Fault-tracing information
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Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off
- Reinstall the connectors, components etc.
- Ignition on.
Read off the value by clicking on the VCT2000 symbol.
Check that the power seat module (PSM) is receiving the signal from the Hall sensor. Operate seat motor 3. Check whether the value counts up or down as the seat is moved in each direction.
Also check that the seat is moved to a programmed position by pressing one of the memory buttons. It may be necessary to program in a new seat position first. This is done by pressing MEM at the same time as one of the memory buttons 1, 2 or 3.
Is the function OK?
Yes - FAULT FOUND
No - Fault-tracing information
-------------------------------------------------
Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off
- Reinstall the connectors, components etc.
- Ignition on.
Read off the value by clicking on the VCT2000 symbol.
Check that the power seat module (PSM) is receiving the signal from the Hall sensor. Operate seat motor 4. Check whether the value counts up or down as the seat is moved in each direction.
Also check that the seat is moved to a programmed position by pressing one of the memory buttons. It may be necessary to program in a new seat position first. This is done by pressing MEM at the same time as one of the memory buttons 1, 2 or 3.
Is the function OK?
Yes - FAULT FOUND
No - Fault-tracing information
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Fault-tracing information
The fault should now have been detected and remedied. As this is not the case, the fault-tracing has failed. Exit fault-tracing or try again.
Do you want to exit fault-tracing?
Yes - FAULT-TRACING FAILED
No - Fault-tracing information
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