Test Steps - Section 32

Preliminary work: Pneumatic System Equipment (PSE) Control Module
Diagnosis - Diagnostic Trouble Code (DTC) Memory PSE
PSE Control module voltage supply ETP, Test Steps PSE => 1.0
PSE Control Module Test PTP, Test PSE

Data (mbar):

Special Tools:

A. Entire system

Preparation For Test:
Vehicles up to 07/94:
1. Disconnect pneumatic multiple connector from PSE control module.
2. Connect tester to bottom side of pneumatic multiple connector at PU using connector 129 805 04 44.

Vehicles as of 08/94:
1. Disconnect grey pneumatic line with socket from PSE control module.
2. Connect tester to disconnected pneumatic line using connector 129 805 04 44.

Parts Required for Test:
1 Connector 129 805 04 44
2 Connector, 50 mm long 007 997 61 82
1 Pneumatic line, 1 m long 000 158 14 35

NOTE: The connections on the PSE control module and pneumatic multiple connector are marked with their German acronyms. In other words:
ZV (German) = CL (English),
RH (German) = BA (English),
FKS (German) = RHR (English),
SFG (German) = RTG (English),
PU/P+ (OSL) (German) = PU/P+ (OSB) (English),
PU/P- (SRU) (German) = PU/P- (MVA) (English).

Test Step 1.0 & 2.0:

B. Line with pressure reservoir/line with control valve

Preparation For Test:
Vehicles up to 07/94:
1. Pry off grey orthopedic seat backrest (OSB) pneumatic line at pneumatic multiple connector (using a 7 mm open end wrench).
2. Connect tester in sequence to each of the grey OSB pneumatic lines which lead to either the pressure reservoir in the trunk or one of the two control valves at the front seats using connector 007 997 61 82.

Vehicles as of 08/94:
1. Disconnect grey OSB pneumatic lines at pneumatic distributor.

Letters on the distributor indicate where the pneumatic lines lead to:
A -> Vacuum reservoir
B -> Left front seat
C -> Right front seat

On vehicles as of approx. 06/94, the disconnected pneumatic lines are to be reconnected to the distributor with connector 007 997 61 82.

Parts Required for Test:
1 Connector, 50 mm long 007 997 61 82

Test Step 3.0 & 4.0:

C. Control valve

Preparation For Test:
1. Remove control valve for lumbar support or multi-contour backrest.
2. Cap all connections on control valve except connection P with caps, part no. 000 987 29 45.
3. Connect vacuum/pressure tester to connection P of control valve.

Parts Required for Test:
5 Caps 000 987 29 45
1 Connector, 50 mm long 007 997 61 82

Test Step 5.0 & 6.0:

D. Lines

Preparation For Test:
1. Connect tester to one end of pneumatic line and plug other end with cap, part no. 000 987 29 45.

Parts Required for Test:
1 Cap 000 987 29 45
1 Connector, 50 mm long 007 997 61 82
1 Connector 129 805 04 44

Test Step 7.0:

E. Air cushion

Preparation For Test:
1. Provide access to connector between control valve and pneumatic lines.