What is the auxiliary battery in the Mercedes?
Mercedes-Benz auxiliary battery is a rechargeable 12V 1.2Ah battery. The alternator charges the auxiliary battery when the engine is running. If the auxiliary battery voltage drops significantly, the alternator will stop charging it, and you will get an aux battery warning on the dashboard.
Where is the auxiliary battery on a Mercedes Benz W211?
This guide provides instructions on how to replace the auxiliary battery from 2003 through 2009 Mercedes-Benz E-Class W211 vehicles such as E320, E350, E500, E55 AMG, E63 AMG. Open the hood and locate the auxiliary battery on the passenger side of the engine bay.
What do Mercedes auxiliary batteries do when the battery dies?
Mercedes auxiliary batteries occasionally operate in conjunction with the main systems battery or take over for it when that battery dies or has extremely low voltage.
How does a dual battery system work on a Mercedes?
When the main battery has moderately low voltage, the vehicle computer connects the two batteries, allowing the main battery to return to normal, while charging the auxiliary battery at the same time. Many Mercedes vehicles feature a dual battery system to prevent failures in their combined hydraulic and electric braking systems.
How does the auxiliary battery control module work?
The battery control module monitors system voltage. If voltage reaches a low point, the auxiliary battery relay closes to connect the battery to the vehicle fuse blocks. Remember that your car may have been serviced before and had parts replaced with different size fasteners used in the replacement.
This guide provides instructions on how to replace the auxiliary battery from 2003 through 2009 Mercedes-Benz E-Class W211 vehicles such as E320, E350, E500, E55 AMG, E63 AMG. Open the hood and locate the auxiliary battery on the passenger side of the engine bay.
Mercedes auxiliary batteries occasionally operate in conjunction with the main systems battery or take over for it when that battery dies or has extremely low voltage.
When the main battery has moderately low voltage, the vehicle computer connects the two batteries, allowing the main battery to return to normal, while charging the auxiliary battery at the same time. Many Mercedes vehicles feature a dual battery system to prevent failures in their combined hydraulic and electric braking systems.
The battery control module monitors system voltage. If voltage reaches a low point, the auxiliary battery relay closes to connect the battery to the vehicle fuse blocks. Remember that your car may have been serviced before and had parts replaced with different size fasteners used in the replacement.