Movement When Not Permitted

IA. Diagnostic trouble code (DTC) information

Condition
Motor 1 controls the seat adjustment for length. If the
control module receives a signal from the potentiometer that motor 1 is operating even though control button for seat forward/backward is not being activated then diagnostic trouble code (DTC) PSL/PSR-123 is set.

Possible source
- Wiring to motor 1 incorrectly connected.
- Wiring to potentiometer 1 incorrectly connected.
- Wiring pinched or damaged.
- Defective control module.

Fault symptom(s)
- The seat moves forward/backwards when seat position is adjusted.
- The seat moves forward/backward only a short moment before automatic shutdown occurs.
- Fault-tracing begins at IB. Movement when not permitted.





IB. Movement when not permitted

IB1: Checking potentiometer signal
- Ignition OFF.
Select scrolling values and read off the value from potentiometer 1.

Use the control buttons to adjust the seat forward/backward, the backrest angle and the height adjustment at front and rear seat edges.

The value from potentiometer 1 should only be affected when the seat is adjusted forward/backward and not when the other functions are affected. Forward/backward movement should stop when the button is released.

If reading Is OK:
- IB7

If reading is incorrect:
- IB2





IB2: Checking connections on leads
- Ignition OFF.
- Remove seat from car according.
Check and correct incorrectly connected leads to motor 1 and to the potentiometer on motor 1.

When reconnecting:
- Press the pins out of connector C for the leads that are to be connected. Use terminal removal tool 951 2831.
- Change over the leads and press the pins into the connector.

Were there any problems with connections?

Yes:
- IB5

No:
- IB3





IB3: Checking wiring for short-circuits
- Ignition OFF.
- Disconnect the black 14-pin connector C and the 3-pin connector on potentiometer.
- Check the yellow/red signal lead in the black 14-pin connector, terminal C:9 and the two other yellow/red signal leads, C:11 and C:11, for short-circuit between the two leads.

Was a fault detected?

Yes:
- IB5

No:
- IB4





IB4: Replace component
The motors and potentiometers are correctly connected and the leads are not damaged.
Try a new control module. Control module, Service and Repair

Then continue with:
- IB5





IB5: Verification
Hint: After carrying out the repair, check that the fault has been remedied as follows:
- Ignition OFF.
- Reinstall components, connectors etc.
- Connect up seat in car.
Select scrolling values and read off the value from potentiometer 1.

Use the control buttons to adjust the seat forward/backward, the backrest angle and the height adjustment at front and rear seat edges.

The value from potentiometer 1 should only be affected when the seat is adjusted forward/backward and not when the other functions are affected.

If reading is OK:
- Fault corrected

If reading is incorrect:
- IB6

IB6: Fault-tracing information
The verification result shows that the fault persists.
Do you want to exit fault-racing?

Yes:
- Fault not corrected

No:
- IB1





IB7: Intermittent fault
Check the yellow/red signal lead in the black 14-pin connector, terminal C:9 and the two other yellow/red signal leads, C:10 and C:11, for intermittent short-circuit between the two leads.

The fault can also be due to a relay in the control module temporarily sticking in the closed position but then releasing and opening correctly.
If the fault persists after verification, try a new control. Control module, Service and Repair

Then continue with:
- IB8

IB8: Fault-tracing information
For intermittent faults fault-tracing is not followed by a verification because the fault is not present at this moment.
Do you want to repeat fault-tracing?

Yes:
- IB1

No:
- Operation done