Esc + ABS + Diff locks + Airbag warning after dual battery installation

[nasmo]

Hello all!

Be successfully managed to install the dual battery setup and we got 100ah lithium lipro4 installed with a redarc system. Now the top plug and play electrical outlets are being fed directly from the second battery.

I'm happy to also connect the back outlet directly to the second battery so now both of my fridges are draining the lithium battery.

I am now faced with a very weird problem. ABS+difflocks+Airbag+ESC warning lights are on. My car wont engage the difflocks and yr maximum speed on the road is 78 kph or 50mph without an ability to do cruise control.

Keep in mind that I have done zero cutting or rewiring of the cables and I made sure to stay on the safe side during the dual battery setup as I didn't want to mess up the warranty.

The dealership did a check and all fuses are good and there is no harness or obstruction anywhere in the wheels. They continued to perform 3-5 hard resets and all of them come back with the same errors.

What seems to be the problem

 

[Skydance]

Are you aware of the following procedure when resetting the battery. I would do a reset by disconnecting the negative after the vehicle is in sleep mode. Before doing so check all ground connections. Go for a drive, some warnings light may come on but should eventually go away after a couple of starts. If problem still persists then dealers may need to reset software.

 

[nasmo]

Quick update: when car is switched off and goes into sleep mode and then it's switched on, I can now drive over 78 kmph/50 mph.

If I attempt to switch on diff locks or ESC it will give an error and I can only do those speeds.

Also cruise control will not work in all the cases mentioned

 

[nasmo]

Are you aware of the following procedure when resetting the battery. I would do a reset by disconnecting the negative after the vehicle is in sleep mode. Before doing so check all ground connections. Go for a drive, some warnings light may come on but should eventually go away after a couple of starts. If problem still persists then dealers may need to reset software.


View attachment 7882719

Yes I'm aware of that and my electrician did not follow this. The dealership attempted to do a hard reset 4-5 times but to no avail.

 

[TD5-90]

Quick update: when car is switched off and goes into sleep mode and then it's switched on, I can now drive over 78 kmph/50 mph.

If I attempt to switch on diff locks or ESC it will give an error and I can only do those speeds.

Also cruise control will not work in all the cases mentioned

The (german 2023) owner's manual says that driving with axle diffs locked is only supported up to 70kmph. It also says that ESC does not work (it _cannot_ work for technical reasons btw...) if axle diff(s) are locked.
So, maybe there isn't a malfunction?

 

[nasmo]

The (german 2023) owner's manual says that driving with axle diffs locked is only supported up to 70kmph. It also says that ESC does not work (it _cannot_ work for technical reasons btw...) if axle diff(s) are locked.
So, maybe there isn't a malfunction?

Yes but my diff locks wouldn't engage , I get an error. They start flashing amber and I am warned to check for conditions before locking. Except all conditions are good there shouldn't be a reason for diff locks not to engage.

Then my car suddenly is limited to 78 kmph and I need to shut off the car and let it sleep for me to enjoy higher speeds.

 

[TD5-90]

Yes but my diff locks wouldn't engage , I get an error. They start flashing amber and I am warned to check for conditions before locking. Except all conditions are good there shouldn't be a reason for diff locks not to engage.

Then my car suddenly is limited to 78 kmph and I need to shut off the car and let it sleep for me to enjoy higher speeds.

At what speed are you driving when trying to engage the difflock(s)? According to the manual, you have to

• have center diff LOW & locked,
• be slower than 15kmph,
• accelerator not more than 40%,
• ESC not active at the moment you engage the diff lock(s)

Flashing means the lock(s) try to engage. Usually, after a couple of wheel revvs they engage.

 

[nasmo]

At what speed are you driving when trying to engage the difflock(s)? According to the manual, you have to

• have center diff LOW & locked,
• be slower than 15kmph,
• accelerator not more than 40%,
• ESC not active at the moment you engage the diff lock(s)

Flashing means the lock(s) try to engage. Usually, after a couple of wheel revvs they engage.

It only flashes when car is on power not ignited.

When in the setting you mentioned and I attempt to engage it it won't even flash ! I get check locking conditions.

Then my speed is locked to 78 kmph until I put my car to sleep and switch it back on

 

[nasmo]

At what speed are you driving when trying to engage the difflock(s)? According to the manual, you have to

• have center diff LOW & locked,
• be slower than 15kmph,
• accelerator not more than 40%,
• ESC not active at the moment you engage the diff lock(s)

Flashing means the lock(s) try to engage. Usually, after a couple of wheel revvs they engage.

Any attempt to set the diff locks will lock me into 78 kmph speed limit

 

[ryket]

I'm not an electrician but as a basic troubleshooting step... have you tried disconnecting the second battery & charger and making sure your primary battery is fully charged? If the problem goes away then you know where the fault is, if not then maybe something was damaged or misconfigured during installation.

 

[nasmo]

I'm not an electrician but as a basic troubleshooting step... have you tried disconnecting the second battery & charger and making sure your primary battery is fully charged? If the problem goes away then you know where the fault is, if not then maybe something was damaged or misconfigured during installation.

Hello there .

Yes we have tried that as well . The main battery is working as is charging and discharging properly without any issues. The secondary battery is also working as it should.

The dual battery system is wired well but I am currently at the dealership and they are having hell clearing the codes because they don't want to clear