Solenoid Valve Activation Test Test Lamp

It is recommended to remove the control switch and trim panels on the sides of the center console (see B 4a), to be able to check the activation of solenoid valves.

Connect test lamp on car ground (never use the solenoid valve holding bar). Place test tip on each electric wire connection.

Note: The cold start interlock must be switched off. Coolant temperature above 40 "C.

This temperature is guaranteed, if the needle of the coolant temperature gage has reached the end of the first white section.

Valves are arranged with 180° displacement since 1983 models. It is recommended to remove the entire center console for testing.

M 563

Control switch

Plug connector, 4 pin

Temperature control

No. 921 wire harness

' Plug conneclnr, 6-pm

No 3 wire harness

M 563

Control switch

No. 921 wire harness

Testing Solenoid Valve

Temperature control

' Plug conneclnr, 6-pm

No 3 wire harness

A- Water valve + mixture flap

B- Bypass flap

C- Footwell flap

14-pin

No. 181 wire harness

A- Water valve + mixture flap

B- Bypass flap

C- Footwell flap

D/E- Center noiile ventilation 1st/2nri Step

14-pin

No. 181 wire harness

Set center nozzle switch to up (open), pull off plug S1 on control unit and turn on ignition. Set temperature control lever to 18 °C.

A) Testing Switch Contacts in Control Switch — Program Selection Switch

Connect test lamp between body ground and valve being tested.

Valve

Test Lamp Must Corne On in Switch Position

(heater valve + mixing flap)

A

-red

OFF

(circulating air flap)

B

-blue

OFF

(footwell flap)

C

-yellow

ECO AV, AV

1st stage (center nozzle)

D-

—orange

ECO, AUTO, AV

2nd stage

E-

-brown

(defroster flap)

F-

—green

ECO V, AUTO

The test lamp must go out when operating the center nozzle switch.

B) Testing Switch Contacts in Control Unit (Operating Motor)

Connect plug SI, set center nozzle switch to up (open) and turn on ignition. Connect test lamp between body ground and valve being tested.

Valve

Test Lamp Must Be On/Off in Switch Position

ECO, AUTO, AV AUTO, AV AUTO

Temperature selection switch must be moved from 18° to 30° or from 30° to 18° for each test position. The operating motor runs once during this time, whereby the contact path of a pertinent valve will be run over or bridged.

C) Testing Control Unit (Operating Motor) Function (Temperature Control Switch Set To 18 °C)

Connect test lamp on body ground and terminal ... of plug S1 (S2). Turn on ignition. Test lamp should come on.

Plug S1 -

Corur. Sw. in Pos.

Plug S2 -

Contr. Sw. in Pos.

Term. 3 —

OFF

Term. 10 —

OFF

Term. 9

AUTO

Term. 11 —

ECO to DEF

Term. 12 —

DEF

Check wire connections (see wiring diagram), if there is no activation in the one or other case. If the control switch or control unit has a fault, these parts must be replaced.

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