Test step/Test scope	Test condition	Nominal value	Possible cause/Remedy 1)
1.0 Changing backrest contour in X-direction (intensity)	Turn adjuster slowly from position 0 to position 5 at least 5 times. Sit in seat.	Backrest must change shape noticeably in lumbar area.	Backrest does not change shape and pump motor in PSE control module (A37, A37/1) does not run. 23 PSE 1.0, PSE control module (A37, A37/1). Backrest does not change shape even though pump motor in PSE control module (A37, A37/1) runs. 32 PSE 7.0, 32 3.0.

1) Observe Preparation for Test, see 22.

Preparation for Test 1. Check fuse F4-3 and fuse F4-11. 2. Battery voltage 11 - 14 V. 3. Ignition: ON

Test step/Test scope	Test condition	Nominal value	Possible cause/Remedy 1)
2.0 Changing backrest contour in Z-direction (height)	Adjuster in position 5. In sequence select the three height adjust buttons. Sit in seat.	Backrest must change shape noticeably in lumbar area.	Backrest does not change shape and pump motor in PSE control module (A37, A37/1) does not run. 23 PSE 1.0, PSE control module (A37, A37/1). Backrest does not change shape even though pump motor in PSE control module (A37, A37/1) runs. 32 PSE 7.0, 32 4.0.
2.1 Changing backrest contour in X-direction (intensity)	Turn adjuster slowly from position 0 to position 5 at least 5 times. Sit in seat.	Backrest must change shape noticeably in lumbar area.	Backrest does not change shape and pump motor in PSE control module (A37, A37/1) does not run. 23 PSE 1.0, PSE control module (A37, A37/1).
2.2 Changing backrest contour side bolster pressure	Use side bolster rocker switch to change pressure from minimum to maximum 5 times. Sit in seat.	Backrest must change shape noticeably in side bolster area.	Backrest does not change shape even though pump motor in PSE control module (A37, A37/1) runs. , 32 4.0.

1) Observe Preparation for Test, see 22.