A DIY 12 volt battery monitor - Page 3 - 2017+ Chrysler Pacifica Minivan Forums
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post #21 of 33 (permalink) Old 05-08-2019, 11:08 PM
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Ha-ha, I missed the elephant in the room- the stock sensor will be powered off with the vehicle!
@AZBean your setup is good enough for the intended purposes. If the van is going to malfunction and draw an excessive current you will notice it. Your results are surprisingly good. The TI page on INA226 says that with a 0.15mOhm shunt it is accurate to 10%@1Amp and 25%@0.3Amp.
Twisting the shunt wires might help to reduce the external noise.
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post #22 of 33 (permalink) Old 05-09-2019, 12:30 AM
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In any case none of them physically look like the PacHy's sensor and for that matter, LIN bus or CAN bus, nothing could be read unless the car is powered on, whereas my gadget can collect data while the car is off.
The IBS is mounted to the neg post and is supplied constant power from F12 (5a).. it never turns off. It sleeps until the data request is made on the LIN. See wiring shots.

Your module could tap into the LIN and send those same data requests and listen for the respond like demonstrated in your first document from Vishay - Ie: broacast the HEX “3D” on the LIN. This should not wake the BDC because the BDC is the master. Typically the master has to wake to update and goes back to sleep.

But it would be more helpful to have the info for the exact make of IBS.
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post #23 of 33 (permalink) Old 05-09-2019, 12:41 AM Thread Starter
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The IBS is mounted to the neg post and is supplied constant power from F12 (5a).. it never turns off. It sleeps until the data request is made on the LIN. See wiring shots.
Oooh, that is good information. Maybe I should attach my cheapie USB logic analyzer and see if I can make heads or tails of what is being transmitted.
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post #24 of 33 (permalink) Old 05-09-2019, 05:29 PM
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On a second thought, it maybe not be such a good idea. There is a good chance that the sensor primarily detects the voltage drops under load, and may not be sensitive enough to measure the standby current. Also, if it reads the battery only on requests from BCM, it is not going to send anything while the vehicle is off.

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post #25 of 33 (permalink) Old 05-09-2019, 08:32 PM
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Where can I get instructions and a BOM for building this marvelous device? I have a phantom current drain in my wife's 2008 Miata that I would like to monitor and track down.
post #26 of 33 (permalink) Old 05-10-2019, 12:38 AM Thread Starter
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Where can I get instructions and a BOM for building this marvelous device? I have a phantom current drain in my wife's 2008 Miata that I would like to monitor and track down.
I'm not quite ready to publish the details, but I am working on it. The feature that recharges its little LiPo battery doesn't work since it causes the sensor readings to go awry. Also the software is not up to my (former) professional standards.

Be aware that if you put the battery monitor in the engine compartment of the Miata alongside the 12v battery then the WiFi uploading feature might not work since it would be shielded by the metal of the hood and the engine. The Pacifica Hybrid is a little unusual in that the 12 volt battery is in the passenger compartment, way back on the left side where the spare tire goes for the gas version of the Pacifica. If the WiFi fails to connect then you would have to remove the SD card from the battery monitor in order to get access to the data.

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post #27 of 33 (permalink) Old 05-10-2019, 11:32 PM
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Where can I get instructions and a BOM for building this marvelous device? I have a phantom current drain in my wife's 2008 Miata that I would like to monitor and track down.
Your Miata is a bit harder. It probably doesn't have the factory monitor, so you'll need to install your own shunt and make sure it can withstand the starting current. Pachy doesn't have a conventional starter, its battery maximum load is just a fraction of the usual.

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post #28 of 33 (permalink) Old 05-11-2019, 11:42 PM
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On a second thought, it maybe not be such a good idea. There is a good chance that the sensor primarily detects the voltage drops under load, and may not be sensitive enough to measure the standby current. Also, if it reads the battery only on requests from BCM, it is not going to send anything while the vehicle is off.
BMW uses IBS primarily for closed current draw monitoring along with cranking load/voltage. In a BMW the DME wakes every 15min for 40ms to collect this info and is sleep again.. so there is no reason our Pachy cant.

The worst that I can see is that AZBeans device pulls data and overlaps the BCM request which may set a communication fault.

But that data would speak for itself whether its useful or not.

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post #29 of 33 (permalink) Old 05-12-2019, 11:24 PM
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I imagined that the AZBean's monitor would be a passive device on the LIN bus. Seems safer and easier to program.

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post #30 of 33 (permalink) Old 05-12-2019, 11:39 PM Thread Starter
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I imagined that the AZBean's monitor would be a passive device on the LIN bus. Seems safer and easier to program.
Me too. But since we don't know exactly what sort of commands the IBS responds to, then the first step would be to put a logic analyzer on it while the van was powered on to try and decode the existing LIN bus traffic. I have one of these which should be just the ticket for that purpose: https://www.amazon.com/gp/product/B077LSG5P2

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