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C4 - DS4 Owners :: Forums :: Citroen C4 Picasso and Grand C4 Picasso (B78) 2013 onward :: C4 Picasso (B78) General Questions
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12v power source in boot of 2014 C4 hatch
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Author Post
snake14   
Fri Jul 03 2026, 11:56am
Member No: #63640
Joined: Jul 03 2026
 I recently acquired a 2014 C4 Seduction (hatch). I'm trying to locate a clean 12v power supply that I can tap into in the boot. I tried the reverse lamp and the BSI complains after a few minutes with the car running. I found an unused harness below where higher trim models have a 12v accessory socket but none of the 6 pins seem to be live. Any insights or recommendations would be appreciated.
danlat1415   
Fri Jul 03 2026, 06:29pm
Member No: #48933
Joined: Jul 17 2017
Location: UK
 I recommend joining FrenchCarForum and asking on there
It's a lot more active than this forum and has Citroen techs on there too.
1 User said Thank You to danlat1415 for this Post :
 snake14 (04 Jul 2026 : 02:05)
Ap0qalypto   
Fri Jul 03 2026, 06:43pm
Member No: #52161
Joined: Sep 21 2018
Location: Republic of Serbia
 Position lights or car plate lights are mostly on
1 User said Thank You to Ap0qalypto for this Post :
 snake14 (04 Jul 2026 : 02:05)
snake14   
Wed Jul 08 2026, 10:01am
Member No: #63640
Joined: Jul 03 2026
 Thank you for the replies. I ended up finding another wiring harness that I handy noticed before. It was tucked down behind the trim in the boot. It appears to have 18 slots with 10 containing conductors. One of the wires is live when the ignition is on and there is also a ground wire. I tapped into them and the BSI hasn't complained yet.
 

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