Gauge Cluster does not turn on!?

Mitco39

Here I marked up a copy of page 42. I am leaning towards either the relay (hopefully) or the BCM being dead. I will test the BCM first to ensure that it is sending power to the JB fuse block, again not sure how even directly shorting out fuse 4 to ground would have any effect on the BCM, you would blow fuse G, which I am going to recheck tonight. . Fingers crossed.

What really doesn't make sense to me is the green highlighted route, seems sort of dangerous you short out any of the components being supplied by 3 and you are now drawing power directly from the BCM.

Attached Images

Wiring.jpg (174.5 KB, 24 views)

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SouthArk370Z

The green line: power comes from fuse #3 to the Defogger Relay coil. The BCM sinks to ground in this case. The BCM is not supplying power to the defogger coil.
The Ignition and Blower coils are powered from the BCM, but the Defogger coil is wired "bassackwards" and grounded through the BCM.

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Mitco39

So if that is the case that has to mean I have power at Fuse 3, which means I have power at the relay and its working correctly. Its all going back to fuse 4, but I know for a fact I swapped in atleast 3 different spare fuses. I am going to check the continuity between each of the fuse posts and the terminals. Its looking like something had to have let go inside of the panel itself, or I am a dumbass and fuse 4 is good (or I have a ground on the circuit and it pops it as soon as I turn on the key). Which I know is not the case as I tried fuse 4 in different locations to make sure it was working.

Its a head scratcher...

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2007 Chevy Duramax - EFILive Tuned By Me
2010 40th W/ Nav - Boosted Performance - UpRev Tuned By Me
The Mrs. Ride -2012 335XI N55 BMW - Cobb Tuned By Me, Built by her
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SouthArk370Z

Yep. I'm just glad it's happening to you and not me. :P

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Mitco39

I have about an hour and a half to figure it out tonight before having to go on a date night with the GF. Gotta get a check list hammered out so I can test everything I wanna lol. I hate not knowing what the issue is.

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2007 Chevy Duramax - EFILive Tuned By Me
2010 40th W/ Nav - Boosted Performance - UpRev Tuned By Me
The Mrs. Ride -2012 335XI N55 BMW - Cobb Tuned By Me, Built by her
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GaleForce

Perhaps you burned the wire? The wires at the tripple gauge are very small gauge.

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Cbtech

did you ever come to a resolution on this? this just happened to me tonight but I wasnt doing any kind of gauges just running a power wire from the brake light to the stereo...

SouthArk370Z

You may have knocked something loose. Double-check all the wiring and connectors near where you were working.

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Cbtech

I took the stereo out and make sure all the connections were in nice and tight. Also whats odd is the car will start but when you go to turn it off it doesn't react very well and I have to push the button several times to get to turn off.

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SouthArk370Z

Then the next thing I would look for is a blown fuse. If you can't find what you need in the Owner's Manual, it will be in the FSM.

Maybe you're pushing the button too fast? Maybe the connector on back of the button got knocked loose?


The two may be related. You should be able to figure it out using the wiring diagrams in the FSM.

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Cbtech

I checked all three fuse holders and can't seem to find anything that's blown. What's odd is that it seems to be somehow connected to the backup lights from what I can find in the service manuals. for some reason the backup lights no longer work either but I checked the fuse underneath the dash and our doesn't seem to be blown...

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SouthArk370Z

Check to see what they all have in common.

I'm still leaning toward a connector that got knocked loose. But it could be anything.

Visual checks on fuses are all but worthless. Especially when the fuses are small, lighting is less than optimum, you're in a cramped position, and the fuse rating is stamped right where you need to look. You have to pull the fuse to stand any chance of telling if it's blown or not and even that is not always accurate. Get a cheap VOM (Volt-Ohm-Milliammeter). For checking fuses, it doesn't have to be a good one. You can find them at most auto parts stores or your local Wal-Mart for as little as $5; splurge and get the $10-20 one.

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blak max

update?

Mitco39

Turned out to just be a missed fuse if I remember correctly. To be honest I have no idea how I missed it before making this thread.

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2007 Chevy Duramax - EFILive Tuned By Me
2010 40th W/ Nav - Boosted Performance - UpRev Tuned By Me
The Mrs. Ride -2012 335XI N55 BMW - Cobb Tuned By Me, Built by her
My Build --> http://www.the370z.com/members-370z-...39s-build.html