Gauge Cluster does not turn on!?

Mitco39

Thanks man, I have spent probably 5-6 hours going through it between last night and this morning.

What I realized this morning is the back of the (J/B) has the relays on it. So what I am going to do when I get home from work is pull the #4 fuse and make sure that when the ignition is on I have power to that fuse slot. If I dont I will try and trace it to a relay within that box by testing continuity between that fuse slot and the corresponding relay pin. If that checks out then I will make sure that the relay is getting power from what I would assume is the ignition switch.

If there is no power to turn on the relay then I am leaning towards a faulty ignition switch, however I see no way of how even directly shorting out the gauge wires would make its way back past the relay, the two circuits are not connected. There is a diagram showing an Accessory relay on the back side of this panel, but one would think that this would control much more than just the one fuse.

The power for the fuses do come from the IPDM as you figured, but I do know that there is power at this panel, everything else works but this one circuit. Its almost like something let go inside of this (J/B) between Pin 12C and the relay its connected to.

Attached Images

fuse.jpg (235.6 KB, 36 views)

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SouthArk370Z

Power from battery to Fuse Block J/B:
Battery to Fusible Link Holder fuse #A (140A)
Fusible Link Holder fuse #A to Fusible Link Holder fuse #B (100A)
Fusible Link Holder fuse #B (terminal 1) to Fuse & Fusible Link Block
Fuse & Fusible Link Block fuse #G (30A) to Fuse Block J/B terminal 1E (and IPDM terminal 36)

Taken from 2009 FSM PG-6 - PG-8

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Mitco39

All of these were checked, I ran an ohm meter through every single fuse on the car. I know I have power to Fuse Block J/B, all this is referring to the power routing from the battery to the fuse block. Regardless, I will check again tonight.

__________________
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

SouthArk370Z

OK.
Scrolling down to page PG-19, I see that fuse #9 (10A) of the FBJ/B goes to the push-button start switch (plus the key slot and clutch i/l switch).
PG-38 says fuse #19 (10A) supplies the combo meter (is that the same as triple-gauge or is it the tach/speedo?).
PG-42 shows the Ignition Relay on the back of FBJ/B that turns on fuses #3 & #4 (and #2). Relay is turned on by BCM (terminal 82).

I'm tired of looking for now.

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Mitco39

The thing is the ignition switch appears to be working just fine, it def has power.

Page 38 is referring to the constant on power source that is supplied to the combo meter, this circuit is unaffected as I tested it last night as it should be. I was using the ACC circuit to wire my gauges. This circuit is working just fine. Which further proves that the fuse block does have power.

Page 42 - I missed that! It also looks like Pin 82 also turns on the blower motor, so by that logic if my blower motor is working then that circuit is working. And I believe I remember having to shut off the blower motor last night to save battery while I was running my tests. It also makes sense that I didnt see any airbag lights once the car was running (I started it with both the steering wheel and passenger seat removed).

However if you look at page 42 this relay also controls Fuse 3, which in turn controls pretty much all the other dash components. I know for a fact that I have power on this fuse. But it also appears that this fuse can pull power directly from the BCM? Not sure what the reason for that is, seems kind of backwards that you could have an unfused connection between the BCM and its end components (as seen on page 52)

Thanks for all your help SouthArk, passed right over page 42

__________________
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

SouthArk370Z

The signal coming from the BCM (term 82) is for the Ignition Relay coil. The ground for the relay coil is at terminal 7C of the FBJ/B. The power going through the relay contact to the fuses (#2-4) comes from fuse #G in the Fuse & Fusible Link Block.

PG-52 doesn't show any BCM connections (at least in my 2009 edition). It shows all the items that are supplied by fuse #3 in the FBJ/B.

Edit: PG-56 shows items, including Triple Meter, supplied by fuse #4.

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