Preparation for Test: 1. Model 202 up to 11/94: Check fuses F3-33 and F3-35 ok, 2. Model 202 as of 12/94: Check fuses F1-24 and F1-27 ok, 3. Battery voltage 11 - 14 V. 4. Connect reservoir with vacuum Y-distributor to vacuum/pressure tester. 5. Provide access to PSE control module (A37/4, A37/5) and disconnect PSE pneumatic multiple connector (do not disconnect wiring harness). 6. Connect vacuum/pressure tester with reservoir to PSE control module (see 32, Figure 1). Parts Required for Test: 1 Reservoir 107 800 08 19 1 Y-distributor 017 078 01 45 5 Plug 000 987 29 45 Notes: 1. Before testing the safety switch time of the consumers, as well as between the tests for OSB (pressure) and MVA (vacuum), interrupt the PSE control module power supply for at least 3 seconds. 2. After completing the PSE control module test, do not operate any system which would require vacuum or pressure for approx. 10 minutes. 3. The connections on the PSE control module are marked with their German acronyms. Reference to these connections in this test are made to their U. S. equivalents. In other words: ZV (German) = CL (U.S.), SRU (German) = MVA (U.S.), OSL (German) = OSB (U.S.).

Test step	Test scope	Test connection	Test condition	Nominal value	Possible cause/Remedy
1.0	Central locking system Vacuum supply	PSE control module connector CL to black connector on tester.	Cap connections MVA, OSB, on the PSE control module. Lock central locking system.	450 mbar in 1.2 sec.	23 PSE/CL 2.0 - 5.0, PSE control module (A37/4, A37/5).
2.0	Central locking system Pressure supply	PSE control module connector CL to yellow connector on tester.	Cap connections MVA, OSB, on the PSE control module. Unlock central locking system.	450 mbar in 0.8 sec.	23 PSE/CL 2.0 - 5.0 , A37/4, A37/5
3.0 Only with OSB	Orthopedic seat backrest (multi-contour backrest) Pressure supply	PSE control module connector OSB to yellow connector on tester.	Ignition: OFF Cap connections CL, MVA, on the PSE control module. Ignition: ON	Pump runs after approx. 4 sec. delay. 450 mbar in 0.8 sec.	A37/5
4.0	Intake manifold vacuum assist Vacuum supply	PSE control module connector MVA to black connector on tester.	Ignition: OFF Cap connections CL, OSB, on the PSE control module. Ignition: ON	Pump runs after approx. 8 sec. delay. 450 mbar in 1.2 sec.	A37/4, A37/5
5.0	"Rest" function control Vacuum supply	PSE control module connector MVA to black connector on tester.	Ignition: OFF Engine coolant temperature >50° C. Disconnect transparent pneumatic hose at distributor plug of PSE control module. Push pushbutton.	Pump runs, 450 mbar in 1.2 sec.	23 4.0, PSE control module (A37/4, A37/5).
6.0	Central locking system Safety switch time	-	Cap connections MVA, OSB, on the PSE control module. Using 7mm wrench pry off yellow connector at CL distributor connection. Lock or unlock central locking system.	PSE control module runs, 10± 1 sec.	23 PSE/CL 2.0 - 5.0, A37/4, A37/5
7.0	Additional consumer MVA Safety switch time	-	Ignition: OFF Cap connections CL, OSB, on the PSE control module. Using 7mm wrench pry off transparent pneumatic hose at MVA distributor. Ignition: ON	PSE control module runs, 60 sec.	A37/4, A37/5
8.0 Only with OSB	Additional consumer OSB Safety switch time	-	Ignition: OFF Cap connections CL, MVA, on the PSE control module. Using 7mm wrench pry off grey pneumatic hose at OSB distributor. Ignition: ON	PSE control module runs, 60 sec.	PSE control module (A37/5).