ESS stopped working

[Rhinebeck01]

@Jebiruph
Based on my research, I believe this to be correct.. Can you add to or correct the following.. 8-)

IBS > Clear/Reset:

Disconnect all 12v power to the JL/JT *

Now, when 12v power is restored, the IBS starts a lengthy relearn process.

Until the relearn process is complete, accurate battery state (MAIN battery) information is unavailable to other vehicle systems.

This relearn process requires 5 normal, operator initiated starts with at least eight hours off time between each start. Usually, the process takes a few days of vehicle operation to complete.

Important: The relearn process is restarted every time power is reconnected to the IBS after a complete 12v power disconnection in regard to the vehicle. This has a major effect on the stop/start feature. (ESS)

On edit: I forgot to mention, that you can, with vehicle turned off, just unplug the IBS, leave it unplugged for a few minutes and then plug IBS back in and that to will restart the relearning process.

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[OldGuyNewJeep]

@Jebiruph
Based on my research, I believe this to be correct.. Can you add to or correct the following.. 8-)

IBS > Clear/Reset:

Disconnect all 12v power to the JL/JT *

Now, when 12v power is restored, the IBS starts a lengthy relearn process.

Until the relearn process is complete, accurate battery state (MAIN battery) information is unavailable to other vehicle systems.

This relearn process requires 5 normal, operator initiated starts with at least eight hours off time between each start. Usually, the process takes a few days of vehicle operation to complete.

Important: The relearn process is restarted every time power is reconnected to the IBS after a complete 12v power disconnection in regard to the vehicle. This has a major effect on the stop/start feature. (ESS)

Great info. When I just recently replaced my main battery, I had the AUX disconnected. So, without doing it with intent, I had removed all power. I guess I did and IBS reset, then.

I love this forum for gems like this.Dealer techs, especially the ones who do things like replace batteries, do not know about things like this.

 

[Jebiruph]

Can you elaborate on what this means?

The battery sensor monitors the system voltage and the amps going into and out of the battery over time to learn the state of charge and state of health of the battery. For example, if I apply 14.5v to the battery and no electricity is flowing into the battery, it's fully charged (or a bad battery). If I apply 14.5v and lots of electricity is flowing into the battery, it's low on charge (or a bad battery). There is no magic indicator that says the battery is fully charged, the state of charge for the battery is learned by observing the voltage and amps in and out over time. That's why it takes time for the sensor to learn a battery.

So if they didn't unplug the sensor to reset it when they replaced my battery, the battery sensor is reporting on my new battery based it's analysis of the old battery.

 

[Jebiruph]

@Jebiruph
Based on my research, I believe this to be correct.. Can you add to or correct the following.. 8-)

IBS > Clear/Reset:

Disconnect all 12v power to the JL/JT *

Now, when 12v power is restored, the IBS starts a lengthy relearn process.

Until the relearn process is complete, accurate battery state (MAIN battery) information is unavailable to other vehicle systems.

This relearn process requires 5 normal, operator initiated starts with at least eight hours off time between each start. Usually, the process takes a few days of vehicle operation to complete.

Important: The relearn process is restarted every time power is reconnected to the IBS after a complete 12v power disconnection in regard to the vehicle. This has a major effect on the stop/start feature. (ESS)

I cannot add to or correct any off this. There's more detail here than what I was aware of.

 

[Rhinebeck01]

The battery sensor monitors the system voltage and the amps going into and out of the battery over time to learn the state of charge and state of health of the battery. For example, if I apply 14.5v to the battery and no electricity is flowing into the battery, it's fully charged (or a bad battery). If I apply 14.5v and lots of electricity is flowing into the battery, it's low on charge (or a bad battery). There is no magic indicator that says the battery is fully charged, the state of charge for the battery is learned by observing the voltage and amps in and out over time. That's why it takes time for the sensor to learn a battery.

So if they didn't unplug the sensor to reset it when they replaced my battery, the battery sensor is reporting on my new battery based it's analysis of the old battery.

I cannot add to or correct any off this. There's more detail here than what I was aware of.

@Jebiruph

Actually your last post made me realize that I did not say... I forgot to mention, that you can, with vehicle turned off, just unplug the IBS, leave it unplugged for a few minutes and then plug IBS back in and that to will restart the learning process.

I will go back and edit my post... 8-)

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