Battery Dead .5~1.0V voltage drop normal?

[hsdejong]

I ended up blowing the fuses,

My advice is to stop experimenting if you blow fuses. It is not unthinkable that you might blow (very) expensive electronics too...

Go to a good Mazda dealer!

 

[RedBaron]

Good point about not pulling the fuses. I'll just place the probes across each fuse to get the millivolts.

I doubt this would work. The fuses are dead shorts using very short pieces of 'wire', thus have extremely tiny resistance. Even if 5A were going through a single fuse, I would (guess) the voltage across that tiny resistance is within the margin of error for a consumer multimeter.

But by all means go ahead and try. I would be really interested in the result.

 

[stickerbush]

I doubt this would work. The fuses are dead shorts using very short pieces of 'wire', thus have extremely tiny resistance. Even if 5A were going through a single fuse, I would (guess) the voltage across that tiny resistance is within the margin of error for a consumer multimeter.

But by all means go ahead and try. I would be really interested in the result.

And how you get the probes to contact the fuse leads when the fuse is seated in the fuse box? Seems a lot easier to use a clamp ammeter and pull fuses one by one.

 

[Conrad 16.5]

I doubt this would work. The fuses are dead shorts using very short pieces of 'wire', thus have extremely tiny resistance. Even if 5A were going through a single fuse, I would (guess) the voltage across that tiny resistance is within the margin of error for a consumer multimeter.

But by all means go ahead and try. I would be really interested in the result.

With a HIGHLY accurate meter the voltage drop across each fuse could be measured.

You're not going to be able to do this with a sub $100 meter.

I have a Fluke 45 Fluke 45 Dual Display Bench Multimeter ($495 that's the used price...)

This would do the job, but those cheapies won't.

 

[N7turbo]

And how you get the probes to contact the fuse leads when the fuse is seated in the fuse box? Seems a lot easier to use a clamp ammeter and pull fuses one by one.

With a HIGHLY accurate meter the voltage drop across each fuse could be measured.

You're not going to be able to do this with a sub $100 meter.

I have a Fluke 45 Fluke 45 Dual Display Bench Multimeter ($495 that's the used price...)

This would do the job, but those cheapies won't.

You don't need a $500 meter for this.

 

[StylingSequ]

How to Actuate Door Lock?

What I can't figure out is how to actuate the driver's side door lock. Anyone know?

I can flip the visible door latch, but that doesn't turn off the open-door indicator on the dash. It looks like there is something else that's telling the car's computer that the door is open. On YouTube videos on other cars, there is usually a button on the door trim that needs to be depressed but there isn't anything like that on the CX-5.

Anyone know?

If I can't figure this out, I guess I'll just have to crawl across the front seat and lay upside down to measure the fuses that are near the bottom of the door. Very annoying.

The Draw is Coming From Car's Interior, I Think

I did measure the fuses in the engine compartment. When I pull out fuse #54, the draw plummets from 4.5A to 1.0A. The fuse is labeled as ROOM - for protection of various circuits. I'm guessing these are the fuses that go inside the car? Anyway to figure out what exactly it's for?

When I pull out fuse #44, the draw plummets to .1A. This fuse is labeled as BOSE - Bose Sound System-equipped model [Some Models].

 

[N7turbo]

I did measure the fuses in the engine compartment. When I pull out fuse #54, the draw plummets from 4.5A to 1.0A. The fuse is labeled as ROOM - for protection of various circuits. I'm guessing these are the fuses that go inside the car? Anyway to figure out what exactly it's for?

When I pull out fuse #44, the draw plummets to .1A. This fuse is labeled as BOSE - Bose Sound System-equipped model [Some Models].

Unplug the amplifier under the seat and see if that does something.

 

[StylingSequ]

Unplug the amplifier under the seat and see if that does something.

Thanks. I'll try it tonight.

 

[RL911]

Thanks. I'll try it tonight.

Maybe it’s your Bluetooth module? Not sure if that is tied into the sound system. These were notorious for draining batteries in certain acuras.

 

[RedBaron]

I can flip the visible door latch, but that doesn't turn off the open-door indicator on the dash. It looks like there is something else that's telling the car's computer that the door is open. On YouTube videos on other cars, there is usually a button on the door trim that needs to be depressed but there isn't anything like that on the CX-5.

Many (most) modern cars have the switch built in to the door latch. If the door is showing 'open' when it's closed, the latch is faulty.

 

[cz5gt]

the door latch has 2 positions. The OP is not closing the latch fully. Thats why.

 

[Conrad 16.5]

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You don't need a $500 meter for this.

That's appears to be a Fluke DMM and it's not a sub $100 meter. Not $500 either but it's a better meter than most.