Test - Section 32

Preliminary work: Pneumatic System Equipment (PSE) Control Module
Diagnosis Diagnostic Trouble Code (DTC) Memory PSE
PSE Control Module Test PSE

Data (mbar)
Test procedure
Allowable system leakage at
300 mbar vacuum in 1 minute. Permissible deviation <=30 mbar
Allowable leakage of actuators with lines at
300 mbar vacuum in 1 minute. Permissible deviation <=25 mbar

Special Tools:

A. Entire system

Preparation For Test:

Vehicles up to 07/94:
1. Disconnect pneumatic multiple connector at the PSE control module.
2. Connect the tester to bottom side of pneumatic multiple connector at FKS (RHR) using connector 129 805 04 44.

Vehicles starting 08/94:
1. Disconnect white/blue 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 Connectors, 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:

B. Vacuum lines with actuators

Preparation For Test:

Vehicles up to 07/94:
1. Pry off white/blue rear head restraint retraction (RHR) pneumatic lines at pneumatic multiple connector (using a 7 mm open end wrench).
2. Connect tester in sequence to each of the white/blue RHR pneumatic lines using connector 007 997 61 82.

Vehicles as of 08/94:
1. Disconnect white/blue RHR pneumatic lines at pneumatic distributor.
2. Connect tester in sequence to each of the white/blue RHR pneumatic lines using connector 007 997 61 82.

Letters on the distributor indicate whereto the pneumatic lines are leading.
A -> Left actuator
B -> Right actuator

NOTE:
1. If an actuator does not operate correctly and no leakage is found, check the respective lines for kinks or blockages.
2. 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 2.0:

C. Actuators

Preparation For Test:
1. Remove the actuator.
2. Connect the pressure/vacuum tester to the pneumatic connector of the actuator.

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

Test Step 3.0:

D. Lines

Preparation For Test:
1. Connect the tester at one end of the pneumatic line and seal the other end with cap 124 805 02 44.

Parts Required for Test:
1 Cap 124 805 02 44
1 Connector, 50 mm long 007 997 61 82

Test Step 4.0: