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Terry @ BMS Terry @ BMS is offline
Posts: 32,395
Join Date: Jan 2008
Default 12-03-2014, 09:16 PM


For those looking to push things a little more we have the optional BCM module which is compatible with C400 and C43 models. We expect many 2019 C43 models which are running a little less boost from the factory will benefit from it.

Order here:

Installation directions:

1) Update the JB4 to v4 or newer firmware. On the user adjustment page default FF to 100 and duty bias to the profile shown:

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2) Open hood, lock doors, hide the keys, and wait for 5 min to ECU to go to sleep. Alternatively you can just disconnect the negative battery terminal in the trunk.

3) Attach the blue control wire to pin#1 on the JB4 connector. To do this you'll need to open the JB4 enclosure, run the pin carefully through the rubber grommet, and plug it in to the spot with the #1 next to it. Once inserted it's not possible to remove without a special tool (DSUB removal tool) so check twice before inserting it.

4) Attach the BCM ground fork to a suitable chassis ground.

5) Route the BCM solenoid connections over to the solenoid on the passenger side of the engine under the snorkel and plug it in similar to the other JB4 connections.

6) Once installed and updated grab a short log and post it to this forum or email it in so we can confirm it's working as expected.
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Home of the JB4 the worlds most popular turbocharged tuning system!

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