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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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Old 07-02-2015, 10:19 AM
Jayson Wonder Jayson Wonder is offline
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Location: Halifax, NS, Canada
Join Date: Nov 2014
Posts: 134
Mein Auto: 1998 528i
Best location to tap ground and power


I am just curious what you guys suggest as the best place to tap into for ground and constant 12v in the vicinity of drivers side (LHD) around steering column or kick panel area.

I was expecting to see a common ground piont behind the kick panel but there was nothing. Also had hope to see a power source in that area akso. I wanted to see if anyonr could suggest a better spot or should I just splice into existing wires. Dont wanna run all the way back to the battery.

It's for an immobilizer unit. I am thinking possibly ECU or diagnostic port but I do not want to fry anything.


Last edited by Jayson Wonder; 07-02-2015 at 10:21 AM.
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Old 07-02-2015, 10:22 AM
edjack edjack is offline
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Location: San Jose, CA
Join Date: May 2007
Posts: 13,360
Mein Auto: '97 540i 6 speed
Cig lighter socket is always powered. Find any metal for a ground. Be sure to fuse it at the source.

Ed in San Jose '97 540i 6 speed aspensilber over aubergine leather. Build date 3/97. Golden Gate Chapter BMW CCA Nr 62319.
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Old 07-02-2015, 12:43 PM
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bluebee bluebee is offline
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Location: San Jose, California
Join Date: Mar 2008
Posts: 25,236
Mein Auto: 02 BMW 525i M54 auto 130K
Lots of ideas here...
- How to diagnose & repair an inoperative E39 cigarette lighter socket (1) (2) (3) (4) (5) (6) (7) (8) & how to make your cigarette socket a switched circuit (1) (2) & a BMW Glovebox Flashlight Cigarette Lighter Power Adapter (1) (2) (3) & how to install the Valentine or Escort radar detector (1) (2) & one users method of installing 12v and USB cigarette lighter power adapters for smart phones and cell phones in 2013 (1) & how people add a handsfree bluetooth cellphone or smartphone in 2013 (1) (2) & how some install an iPad (1) or an Android tablet (1)
Please read the suggested threads and add value, either by pictures or by descriptions, so the next person stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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