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post #1 of 11 Old 11th May 2019, 11:25 PM Thread Starter
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Wiring for rearview mirror

I'm about to hook up my radar detector and ordered a cable that comes with positive and negative pins to be plugged into the rearview mirror harness. Can someone tell me which cables I need to plug both of these wires into? Here is what the cable looks like. Thanks.

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

2003 LMB e39 M5
1997 AW e36 M3

Last edited by Haywood; 11th May 2019 at 11:26 PM.
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post #2 of 11 Old 12th May 2019, 03:03 AM
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Here is the pinout https://www.newtis.info/tisv2/a/en/e39-m5-lim/ZVeyrUG, you will want to connect positive to terminal 15 (green with a white tracer I think) and ground to ground (Brown).
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post #3 of 11 Old 12th May 2019, 03:23 AM Thread Starter
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Quote:
Originally Posted by Samsam11 View Post
Here is the pinout https://www.newtis.info/tisv2/a/en/e39-m5-lim/ZVeyrUG, you will want to connect positive to terminal 15 (green with a white tracer I think) and ground to ground (Brown).
Thanks! I'll try that.

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post #4 of 11 Old 16th May 2019, 05:30 AM
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If I recall the green wire is key ignition and brown is typically ground, but using chassis ground is better. Less stuff conncted to the CANBUS the better. However, get yourself an inexpensive tester and always check before cutting into it.

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post #5 of 11 Old 20th May 2019, 06:06 AM
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Well at the end of the wire it is "chassis ground", after going to a comb conector a larger wire conects it to the body of the car under the seat https://www.newtis.info/tisv2/a/en/e39-m5-lim/WH26Kor. I don't really get what you mean by "CANBUS" here, it's not connected at all.
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post #6 of 11 Old 20th May 2019, 06:56 PM
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Originally Posted by Samsam11 View Post
I don't really get what you mean by "CANBUS" here, it's not connected at all
What are you doing here then?

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post #7 of 11 Old 20th May 2019, 07:21 PM
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I am trying to understand what you are saying, is there some CAN bus device that uses ground to actually transmit packets that I don't know about? Am I just reading your post wrong?
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post #8 of 11 Old 20th May 2019, 10:34 PM
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I guess google took the day off today. Iíll try to explain it in a very simple form.

CAN bus, Contoller Area Network. Itís the freeway where all of your sensors and car information runs on. The freeway does not like it when foreign cars are on it, i.e. another module that did not come from factory. So why is this bad? If your car stars acticting funny like error codes you wonít know the real issue until you disconnect all foreign devices and run diagnostic again.

How do people add all of that after market stuff? Two part answer.

1. You can borrow power from the freeway, but should always use chassis for ground.

2. Those people who add stuff and run onto trouble, run here for their answers cause no one out there can identify the problem.

Lastly, when posting a comment one should have a general knowledge on what they are talking about vs. opinions which even they wonít consider.

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post #9 of 11 Old 21st May 2019, 05:32 AM
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The E39 M5 only has 3 CAN nodes, DME, instrument cluster and the DSC/ABS unit, other buses handle other interconnections and their nodes would probably be more susceptible. Interference affecting the actual bus signals is unlikely, however interference to modules or sensors can be coupled through the ground path. And I do agree with you that accessories can cause all kinds of odd problems.

BMW chose to use series connected single-point grounds for most low current items, this is not strictly optimal but given the one hundred or so ground wires, connecting them to the body individually would be very impractical.

Such problems would be more likely if the device installed drew a large current. In this case the ground path is only slightly more complex than that for the lighter socket, if it does not cause problems plugged in there I would not think that it would cause them when connected through the ground to the mirror.

But automotive EMI and common mode interference is complicated and to fully understand the consequences of installing equipment is a guessing game without manufacturer level knowledge of the cars systems.
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post #10 of 11 Old 21st May 2019, 05:52 AM
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Quote:
Originally Posted by Samsam11 View Post
The E39 M5 only has 3 CAN nodes, DME, instrument cluster and the DSC/ABS unit, other buses handle other interconnections and their nodes would probably be more susceptible. Interference affecting the actual bus signals is unlikely, however interference to modules or sensors can be coupled through the ground path. And I do agree with you that accessories can cause all kinds of odd problems.

BMW chose to use series connected single-point grounds for most low current items, this is not strictly optimal but given the one hundred or so ground wires, connecting them to the body individually would be very impractical.

Such problems would be more likely if the device installed drew a large current. In this case the ground path is only slightly more complex than that for the lighter socket, if it does not cause problems plugged in there I would not think that it would cause them when connected through the ground to the mirror.

But automotive EMI and common mode interference is complicated and to fully understand the consequences of installing equipment is a guessing game without manufacturer level knowledge of the cars systems.
Some of us tinkered with the car so much that we have that knowledge. Hence the purpose of this board, to pass the knowledge to the next gen of e39 owners.

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