mercedesbenz Workshop Repair Guides

Mercedes Benz Workshop Service and Repair Manuals

Switchover Valve Block|Page 6927 > < Switchover Valve Block|Page 6925
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Schematic - Vacuum Valve Block

Image Reference:

a:  "Air Conditioning" non-return valve
b:  "Intake manifold vacuum" non-return valve
c:  "Transmission" non-return valve

Connection Diagram - Vacuum Valve Block

No.

Color

From/To

1

medium green/yellow

Footwell air conditioner

2

light blue

Seat backrest lock

3

violet

Headlamp range adjustment switch (input)

4

violet-yellow

Headlamp range adjustment element (left)

5

grey-green

Valve block (Y11)

6

white (transparent)

Intake manifold vacuum assist

7

grey

Intake manifold vacuum

8

Connection not assigned

9

violet-yellow

Headlamp range adjustment switch (output)

10

violet-yellow

Headlamp range adjustment element (right)

11

black-grey

2nd selection program automatic transmission (system)

12

black-grey

2nd selection program automatic transmission (reservoir)

13

red-grey

Air conditioner reservoir

CHECKING VACUUM VALVE BLOCK (36):

Vacuum Valve Block (36)

1. Expose vacuum valve block (36) by removing foot support (front passenger's side).
2. Disconnect grey cable (connection 7) and seal at intake manifold with blind plug. Connect tester and check for leaks.

Vacuum Valve Block

3. Disconnect all cables. Seal connections 5 and 13 with blind plugs, connect tester to connection 6 with adapter and evacuate. If a pressure rise

occurs on the pressure gauge, renew vacuum valve block (36).

NOTE:  If not fault been found, check non-return valves a, b and c in vacuum valve block (36).

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