what's the meaning of 30g,30z,15r,15c,15z,87,etc - Mercedes-Benz Forum

 
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post #1 of 9 (permalink) Old 06-12-2013, 10:22 PM Thread Starter
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Post what's the meaning of 30g,30z,15r,15c,15z,87,etc

Can anyone explain the meaning of 30g,30z,15r,15c,15z,87,etc.and how these terminals to be switched.
thanks a lot.

Last edited by chrischu616; 06-13-2013 at 08:52 PM. Reason: wrong spell
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post #2 of 9 (permalink) Old 06-12-2013, 10:48 PM
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Read pages 1 and 9 of this document. how_to_use_this_manual.pdf

Any further questions?
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post #3 of 9 (permalink) Old 06-13-2013, 12:01 AM Thread Starter
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thank u, i'll read it.
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post #4 of 9 (permalink) Old 06-13-2013, 12:23 AM Thread Starter
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Originally Posted by DrX View Post
Read pages 1 and 9 of this document. how_to_use_this_manual.pdf

Any further questions?
it's not mention how circiut 30g,30z produced.
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post #5 of 9 (permalink) Old 06-13-2013, 06:27 PM
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I would like to know what model you are referring to, and why you want to know about these circuits.

Welcome to the forum.
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post #6 of 9 (permalink) Old 06-13-2013, 08:45 PM Thread Starter
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I would like to know about the new models, for instance, S(W221), ML(W166&W164), A(W176), and so on. I just confuse with these circuits' relation. I can't find more information about this.
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post #7 of 9 (permalink) Old 06-13-2013, 09:56 PM
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That still doesn't explain why you want to know.

Having read the document, you understand that circuit 30 is hot at all times. When the car is switched off, there must still be power to operate the clock, remote control receiver, and alarm system - these are all connected to circuit 30.

Circuit 30g is switched by a relay. In modern MBs, some devices that remain on are automatically switched off after 6 hours or if the battery voltage drops below 11.8 V. This protects the battery from drainage. Systems on circuit 30g include seat controls, SRS components, sound system, and trailer hitch.
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post #8 of 9 (permalink) Old 06-14-2013, 12:35 AM Thread Starter
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I'm a MB's technician. I've understood what you said, thank you. But how about 30z? Could you explain it for me?
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post #9 of 9 (permalink) Old 06-14-2013, 02:54 AM
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You're welcome. Had you told me that earlier, I could have wasted less time on this discussion. I suggest you ask one of your workmates to explain this.

Someone like you could be reasonably expected to explain this topic to a layperson like me.
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