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  #1  
Old 09-17-2011, 06:16 PM
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Quadra-Drive Indicator Light

I've been thinking the last few days. Someone managed to figure out how to create a light to show the MDS on. Has anyone tried making an idicator light to show the differential in "lock". I envison a small picture of the drivetrain with LED's behind each differential that light up to show the E-Locker has been activated.

Anyone try this?
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Old 09-17-2011, 06:23 PM
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I'm pretty sure you would need to find a way to get info off of the on board computer.

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Old 06-03-2015, 09:50 PM
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Re: Quadra-Drive Indicator Light

I know this is a very old topic, but I stumbled across it while researching QDII activation/indicators.
I've done a 'prototype' by just tapping into the DC feed to each solenoid.
Details on my blog if anyone is interested;
Jeep WH/WK QDII eLSD activation indicator LEDs prototype | James Laugesen

This rough setup has been good enough for my needs for a while; it's handy to see what the eLSDs are doing in certain situations.

I've been working on a more elaborate project to control the solenoids (aka, control the "locking".), and also determine the differential oil temperature (very inaccurately at this stage.) via the solenoids.
Still the same general concept; just tapping a microcontroller into the DC feed, rather than interacting with the CANbus (which has proved very difficult for the FDCM, it handles most of the QDII logic entirely internally, controlling the components directly.).
The FDCM seems to be quite tolerant of external 'signals' on the solenoid DC circuits, not throwing codes and shutting things down like some other circuits.
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Old 06-10-2015, 06:27 AM
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Re: Quadra-Drive Indicator Light

A user named Valpacer on the other Jeep Forum has done something like this already. I'm not sure if I can link to any of his posts, but I would go there and do a search.
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Old 06-10-2015, 07:24 PM
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Re: Quadra-Drive Indicator Light

Quote:
Originally Posted by ggrassmid View Post
A user named Valpacer on the other Jeep Forum has done something like this already. I'm not sure if I can link to any of his posts, but I would go there and do a search.
Yeah Dave/Valpacer has wired some switches to force the solenoids on/off for both diffs. Nice simple solution to lock/unlock and proves that the diffs aren't magic, can be retrofitted into a non-QDII vehicle, etc.

I'm controlling mine 'gradually' and read oil (aka solenoid coil.) temperature back, so need the microcontroller in there.
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Old 06-10-2015, 08:21 PM
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Re: Quadra-Drive Indicator Light

I put in the simple method lights like James, followed his instructions actually. I'm a huge fan of this mod, I found out that my 'Service 4WD' message was caused by a bad rear solenoid because of this. saved me a lot of transfer case headache.
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Old 06-10-2015, 08:57 PM
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Re: Quadra-Drive Indicator Light

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Originally Posted by 05AKWK View Post
I put in the simple method lights like James, followed his instructions actually. I'm a huge fan of this mod, I found out that my 'Service 4WD' message was caused by a bad rear solenoid because of this. saved me a lot of transfer case headache.
That's cool! Is the green LED in the centre indicating MDS?
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Old 06-10-2015, 09:04 PM
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Re: Quadra-Drive Indicator Light

yep, though it seems MDS is disabled whenever other drivetrain trouble codes are present.
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Old 06-10-2015, 09:13 PM
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Re: Quadra-Drive Indicator Light

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Originally Posted by 05AKWK View Post
yep, though it seems MDS is disabled whenever other drivetrain trouble codes are present.
Oooh interesting. The MDS logic circuits are insane, looks like it's dependent on almost every other circuit... so that makes sense I guess.
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Old 06-17-2015, 06:55 PM
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Re: Quadra-Drive Indicator Light

Looks like a great mod, for those that have done the mds light have you had to change your driving style much to improve fuel consumption.
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Old 06-25-2015, 03:16 PM
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Re: Quadra-Drive Indicator Light

It'd be cool if someone could make up a series of LEDs to show how locked it actually is.
like 25% 50% 75% 100% locked. I'm sure someone with circuit knowledge could do it as the voltage varies going to the diff solenoid, just need to know how much voltage does what.
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