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S-Class (W221) 2007-2013: S 320 CDI, S 350, S 450, S 500, S 550, S 420 CDI, S 600

what i srelay "H" for?

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Old Oct 1, 2010 | 10:56 AM
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isa's Avatar
isa
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s550
what i srelay "H" for?
I think my B and H relays in the fuse box of the driver side engine compartment were mixed up (2007 S550 W221). I was told B is for Airmatic compressor but don't know what H is for. They are both green and 5 legged.

The car ride is little rough, feels like suspensions are overpresurized. At first I thought the relay B was faulty so, I took that relay to the dealer and they gave me a replacement for $10 (part#A002 542 76 19).

Questions:
1. Does anyone know what relay H is for?
2. What is the correct part# for B relay?
3. Are B and H relay interchangable?

Please assist.

Thanks
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Old Oct 1, 2010 | 11:16 AM
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konigstiger
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'71 Pinto
B = compressor relay correct part #0025422319, H is circuit 50/starter.
Last edited by konigstiger; Oct 1, 2010 at 11:43 AM.
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Old Oct 1, 2010 | 11:28 AM
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isa
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Thank you much.

What is the Correct part # for H?

Thanks
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Old Oct 1, 2010 | 11:45 AM
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konigstiger
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Originally Posted by isa
What is the Correct part # for H?
same part # therefore they are interchangeable.
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Old Jan 2, 2022 | 11:21 PM
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Chris Dinh
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W222
Thanks for your knowledge. It's very helpful.
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