Wiper and Washer Systems: Testing and Inspection

Alternating Park Position Of Wiper Motor (APP Function), Deactivating

Special tools, testers and auxiliary items required

• Vehicle Diagnosis, Testing and Information System (VAS 5051A)

General Description

The front windshield wiper system is equipped with an alternating park position, the so-called APP function.

The APP function causes the wiper at every second shut off to move upward slightly after reaching the lowest position.

For the following work, it is necessary to shut off the motor in the lower park position.

• Installing and removing motor crank on wiper motor, refer to => [ Wiper Motor From Wiper Frame ] Wiper Motor From Wiper Frame.

• Adjust windshield wiper blade park position, refer to => [ End Position Of Windshield Wiper Blades, Checking/Adjusting ] Adjustments.

The park position setting is attained by deactivating the APP function (code Wiper Motor Control Module (J400) ).

• An activation of APP function is not possible.

• APP function is automatically activated after 100 wiping cycles. This applies to wiper motors in which the APP function was deactivated as well as for new wiper motors.

Procedure

- Connect (VAS 5051A).

- Select "Guided Fault Finding" in the (VAS 5051A).

- Then perform vehicle identification on tester.

The program now automatically performs a vehicle system test and reads all control modules possible for this vehicle type.

- Using the "Go To" button, select "Functions/Component selection" and the following menu options in sequence:

• Body

• Electrical Equipment

• 01 - On Board Diagnostic (OBD) capable systems

• Vehicle electrical system control module

• Vehicle electrical system control module - functions

• Coding control module for wiper electronics/deactivating APP