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Steve @ BMS/Fuel-It! Steve @ BMS/Fuel-It! is offline
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Posts: 18,440
Join Date: Oct 2012
Car: 135i
Default 01-19-2015, 10:25 PM

Directions for wiring up the new BMS JB4 Port Injection Controller:

2 Black wires go to ground
Red goes to JB4 power on green connector
Yellow goes to the BMS data cable #9
White goes to JB4 DB25 main harness #15
Purple goes in the small gray subconnector #21 as read from the female side. You can remove the JB4 jumper wire and place the new one with the spliced wire in it's place for a clean no-tape connection.

There is an extra thicker yellow wire, or orange wire in some batches, that provides +12v to run a secondary fuel pump relay. If not equipped or not used just cap off this wire with tape.



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Video of our Stage 2 LPFP upgrade installation.

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