Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Wiper Motor Control Module -J400-, Deactivating App Function
Special tools and workshop equipment required
- Vehicle Diagnostic Tester
The windshield wiper system is equipped with the Alternating Park Position (APP) function.
The APP function causes the wiper at every second shut off to move upward slightly after reaching the lowest position.
To install the motor crank on the wiper motor, it is necessary to shut off the motor in the lowest park position. This is attained by deactivating the APP function (code Wiper Motor Control Module -J400-).
Note the following:
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 the Vehicle Diagnostic Tester.
-- Select Guided Fault Finding in the Vehicle Diagnostic Tester.
-- Use the GO TO button to select the "function/component selection" and the following menu options one after the other:
- Body
- Electrical Equipment
- 01 - On Board Diagnostic (OBD) capable systems
- Vehicle electrical system control module
- Vehicle electrical system control module - functions
- Coding the wiper motor control module/deactivating the APP function
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.