45221/25221 - 45224/25224

TROUBLE CODES 45221/25221, 45222/25222, 45223/25223, 45224/25224

Diagnostic Trouble Codes

XX221 - Seat front pot break/short batt +

XX222 - Legroom adjustment pot break/short batt +

XX223 - Seat rear pot break/short batt +

XX224 - Backrest pot break/short batt +

Fault Symptom

- New seat settings cannot be stored in the memory.

- One or more motors fail to work when changing to settings stored In the memory.

- The backrest cannot be adjusted manually (only when backrest potentiometer faulty)

Probable Causes

- Connection broken between: The electronic unit and pin 3 of the potentiometer, the electronic unit and pin 2 of the potentiometer.

- Short circuit in the leads connected to pins 1 and 2 of the potentiometer.

- Faulty potentiometer.

Diagnostic Procedure





Important: If a potentiometer has been removed, it must be recalibrated before the seat is used. Calibration is carried out by running the relevant motor to both end positions.

1 Unplug the potentiometer connector.

- With the ignition switched on or a door open, take a reading across pins 1 and 3 to check whether the potentiometer is being supplied with current.

- A reading of about 5v should be obtained. This is the standard voltage.

- If such a reading is not obtained, check the connection between pin 1 of the potentiometer and the control module, and also between pin 3 and the control module.

- If this is OK, continue with point 2.





2 Check the connection between pin 2 of the potentiometer and the control module.

3 Check whether the potentiometer is OK by measuring the resistance across its connections. Correct resistance's are:

across pins 1 and 3 = approx. 2200 Ohm
across pins 2 and 3 = 20-2200 Ohm
across pins 1 and 2 = 20-2200 Ohm

- If the correct resistance is not obtained, the fault lies with the potentiometer and it must be changed.

- If the correct resistance is obtained, the fault lies with the control module and it must be changed.