Test step/Test scope	Test condition	Nominal value	Possible cause/Remedy 1)
1.0 Changing backrest contour in X-direction (intensity of lower and upper air cushion).	Turn pressure adjuster for upper or lower air cushion slowly from minmum to maximum at least 5 times.	Backrest must change shape noticeably in lumbar support area.	Backrest does not change shape and pump motor in PSE control module (A37) does not run. 23 PSE 1.0- 8.0, 2.1 23 PSE 1.0- 3.0, Combination control module (N10-1). PSE control module (A37). Backrest does not change shape even though pump motor in PSE control module (A37/5) runs. 32 1.0-2.0, 33 PSE 3.0
2.0 Changing backrest contour side bolster.	Use side bolster rocker switch to change pressure from minimum to maximum 5 times.	Backrest must change shape noticeably in lumbar support area.	Backrest does not change shape and pump motor in PSE control module (A37) does not run. 23 PSE 1.0- 8.0, 2.1 23 PSE 1.0- 3.0, Combination control module (N10-1). PSE control module (A37). Backrest does not change shape even though pump motor in PSE control module (A37/5) runs. 32 3.0, 33 PSE 3.0
3.0 Changing seat bottom cushion length.	Turn pressure adjuster for seat bottom cushion from minmum to maximum 5 times.	Seat cushion length must change noticeably.	Backrest does not change shape and pump motor in PSE control module (A37) does not run. 23 PSE 1.0- 8.0, 2.1 23 PSE 1.0- 3.0, N10-1, A37 Backrest does not change shape even though pump motor in PSE control module (A37/5) runs. 32 4.0, 33 PSE 3.0

1) Observe Preparation for Test, see 22.