What is the control principle of the 5-wire window regulator in the old Jetta?
2 Answers
The control principle of the 5-wire window regulator in the old Jetta is that the rear door motor has an ECU module with thermal protection inside its circuit, and the motor's thermal protection is achieved through software algorithms. Here is some related information about the Jetta: 1. Introduction: Jetta is a car brand produced by FAW-Volkswagen Automotive Co., Ltd., a joint venture of the German Volkswagen Group in China. 2. Vehicle Features: The Volkswagen Jetta was the first in China to adopt the world's most advanced 5-valve multi-point electronic fuel injection engine, and with its unique product design performance and comprehensive safety technology equipment, it formed the distinctive product personality of the Jetta series of cars.
I've repaired quite a few five-wire window regulators on old Jettas, and this design is actually quite ingenious. It mainly controls the lifting and lowering by changing the current direction through the window switch. Among the five wires, two are for the motor, one is the power line connected to the positive terminal, and the other two are control signal wires for up and down respectively. When you press the window-up button, the switch connects the power line to the up signal wire to power the motor; pressing the window-down button switches to the down signal wire circuit. The entire circuit operates on a relay control mode, with small copper tabs inside the switch panel switching between different circuit combinations. However, problems often arise after prolonged use, especially on rainy days when water ingress can cause contact oxidation. At this point, the window gets stuck and won't move, requiring disassembly to clean the contacts or replace the switch to fix it.
