Where is the secondary air pump relay for Mercedes-Benz R400 located?

1 Answers
LeDaisy
07/29/25 11:33pm
Mercedes-Benz R400 secondary air pump relay is located in the right fuse box in the engine compartment, where O is the air pump relay and 32 is the air pump fuse. Relay Overview: A relay is an automatic control device where the output undergoes a step change when the input (electrical, magnetic, acoustic, optical, or thermal) reaches a certain value. Automotive relays are relays used in vehicles. Relay Characteristics: Automotive relays have high load-switching power, impact resistance, and vibration resistance. The power supply in vehicles is mostly 12V, and the coil voltage is generally designed for 12V. In the engine compartment, the ambient temperature range is required to be -40°C to 125°C, while in other locations, the ambient temperature range is -40°C to 85°C.
Was this review help?
15
4
Share
More Forum Discussions

What does the red color on the navigation mean?

Navigation uses red to indicate traffic flow conditions on the road. Red represents congestion, while green indicates smooth and unobstructed traffic on the current route. The red color serves as a reminder for drivers to consider alternative routes. Car navigation systems utilize the GPS (Global Positioning System), typically featuring automatic voice navigation and route search functions to ensure efficient and stress-free driving. A car navigation system mainly consists of two parts: a GPS receiver and display device installed in the vehicle, and a computer control center. The navigation system also supports one-touch Bluetooth hands-free functionality, with a built-in Bluetooth hands-free device enabling drivers to make calls with a single button press while driving.
7
3
Share

What are the symptoms of a damaged car air conditioning compressor?

Damage to the car air conditioning compressor can cause the air conditioning to stop working or result in poor cooling performance. Obvious symptoms include the compressor failing to rotate, abnormal noises during rotation, abnormal pressure levels, high pressure being too low, low pressure being too high, or both high and low pressures showing no change. Common failure points in a car air conditioning compressor include: 1. Damage to the intake and exhaust valves; 2. Burnout of the compressor electromagnetic clutch coil. Methods to determine the condition of the car compressor: 1. When there is a certain amount of refrigerant in the system, disconnect the compressor's low-pressure pipe and block the high-pressure side pipe fitted with a pressure gauge; 2. Increase the engine speed to approximately 2000 RPM. At this point, the compressor's high pressure should be around 1.5 MPa, and there should be no significant change in pressure for several minutes after the engine is turned off, indicating good compressor performance. Otherwise, the compressor may be considered subpar.
19
3
Share

What car has a pentagram logo?

Vehicles with a pentagram logo include Venucia and JAC. Taking the Venucia D60 as an example, its body dimensions are 4756mm in length, 1803mm in width, and 1487mm in height, with a wheelbase of 2700mm. This model is a new compact sedan under Dongfeng Venucia, featuring the brand's Wind Sculpture design philosophy. The Venucia D60 has a low and flat front fascia, with a grille composed of horizontally arranged chrome blocks. Thick chrome strips on both sides integrate seamlessly with the slim headlight clusters, which include LED daytime running lights. At the rear, the taillights feature black outlines paired with silver chrome trim, creating a distinctive visual effect.
3
5
Share

How to Test if the Battery Has Power?

Methods to test if the battery has power: 1. Use a multimeter to test. Adjust the dial to the voltage V setting, connect the red and black probes to the two terminals of the battery, and check the voltage display. A reading of 12V indicates the battery is at normal voltage. 2. Check through the battery's observation window. If the observation window shows green, it means the battery has sufficient power and is functioning normally. 3. Use a test light to check the battery's power. Connect both ends of the test light to the battery's terminals. If the test light bulb shines normally, it indicates the battery has normal power. Generally, if the car battery voltage drops below 9V, it may already have difficulty starting the engine. However, there's no need to worry too much. Simply driving normally for one to two hours can restore the battery to normal power. But if the situation is severe to the point where the engine cannot be started, a jump start may be required to activate the generator.
5
1
Share

How to turn off the speed display exceeding 30 in Volkswagen cars?

Methods to turn off the speed display exceeding 30 in Volkswagen cars: 1. Use the set button on the steering wheel; 2. Use the plus and minus buttons to adjust the speed limit, then press the ok button to confirm. Car owners can refer to the manual, which contains detailed instructions. Taking the Volkswagen Lavida as an example, its body dimensions are 4605mm, 1765mm, and 1460mm, with a wheelbase of 2610mm. The car's iconic horizontal grille has evolved again, integrating better with the headlights, resulting in a groundbreaking change in the overall design. The Lavida's in-car navigation system combines touch screen and knob control operation, and has MP3 playback capability, supporting USB, AUX, and SD card expansion slots. It is easy to use and powerful, with the LCD screen adopting a foldable design.
12
2
Share

What are the body dimensions of the Honda XR-V?

The body dimensions of the Honda XR-V are 4328mm in length, 1772mm in width, and 1605mm in height, with a wheelbase of 2610mm. Its exterior design follows the family-style design, featuring an integrated design for the front grille and headlights on both sides, creating a strong sense of unity. The grille is decorated with glossy black panels and chrome trim, exuding a strong sense of fashion. The headlights on both sides use sharp lines, giving them high recognizability and an aggressive look. The lower grille has an exaggerated shape with a large-mouth design, offering a strong sense of layering and decorated with thick chrome trim, making it look more youthful and dynamic.
17
2
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.