What Causes the Passat 373 Relay Failure?
2 Answers
The relay may produce abnormal ticking sounds when operating. If it is damaged, then original equipment manufacturer (OEM) parts should be sought. Below are specific details about the Passat: 1. Historical Background: The Passat (PASSAT) is a mid-size sedan designed by Volkswagen AG in Germany. It is classified as a B-segment vehicle in Volkswagen's lineup. Since its debut in 1973, the Volkswagen Passat has set high standards in safety, classic design, and top-tier manufacturing quality, dominating the global automotive market for over 40 years, with more than 20 million units produced and sold. 2. Naming Introduction: In the European market, it is known as the Passat, while in other markets, it is referred to as the Dasher, Santana, Magotan, or Quantum.
I often see several causes for the Passat's 373 relay failure. First is contact wear – it's like the switch contacts getting oxidized and flaking after repeated friction, leading to poor contact or complete jamming. Then there's the coil issue; if voltage fluctuates, such as when the generator output is too high, the coil may overheat and burn out. Another factor is humid environments, especially in rainy southern regions where relays easily rust or short-circuit internally. Improper use, like modifying circuits to increase load, can also accelerate aging. For diagnosis, use a multimeter to check voltage and continuity – replace immediately if resistance is abnormal. Prevention is simple: regularly inspect the electrical box for dryness and cleanliness, prevent dust buildup that affects heat dissipation, as long-term neglect can trigger more circuit issues, making repairs more troublesome and costly.
