E-Class (W211) 2003-2009

How to replace the AUX Battery relay

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Old Oct 2, 2017 | 11:12 AM
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plasma's Avatar
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2003 E320
How to replace the AUX Battery relay

Has anyone ever changed out the aux battery relay? MB says mine is bad and wants $550 to replace. I know this can be a DIY project, I just need to know the location.
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Old Oct 2, 2017 | 11:35 AM
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konigstiger's Avatar
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From: North Scottsdale, AZ
'71 Pinto
Part # 0025423819, see attachments.
Attached Thumbnails How to replace the AUX Battery relay-capture.jpg   How to replace the AUX Battery relay-capture2.jpg  
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Remove and install wiper arm.pdf (59.9 KB, 1234 views)
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Old Oct 2, 2017 | 07:10 PM
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2003 E320
Thank you!
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Old Mar 4, 2023 | 10:40 AM
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Mercedes E-Class
Changed Aux Battery Relay

Originally Posted by plasma
Has anyone ever changed out the aux battery relay? MB says mine is bad and wants $550 to replace. I know this can be a DIY project, I just need to know the location.
I had an error message with convenience functions not available. Changed the aux battery relay and fixed the problem. Quite easy, unplug battery, remove wipers, take off plastic cover and then replace the relay. All you need is 10mm and 13mm deep sockets
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