"Low battery" warning on 2016 XC60

[pgill]

Michael,

If you have a Volt Meter it would be good to know how much the Voltage dips when cranking. (this will confirm if the battery is defective and has lost capacity or if the state of charge is low because the alternator isn't topping up the battery.)

The Range of Voltage that you are seeing seem reasonable

Here is a chart from Land Rover showing the Voltage depending on Temperature and which type of Battery it is programmed to charge.

The ECU will keep the Voltage at the Accept level until the Battery has reached a high enough state of charge and then it will drop the voltage to the Float amount. If the ECU switches back and fourth between the two Voltage it is likely trying to determine the state of charge of the battery.




Good luck

Paul

[pgill]

Some pictures

[DarkstarT6]

Paul,

Very useful information thanks, I'll be referencing that today. I have saved sensor data from multiple trips to look through. Just from quick real time glances I know that I'm seeing charge voltage and current and stepping down at predefined thresholds, similar to what you mentioned. Aside from diagnosing any real problem, assuming there isn't, I want to be confident when I ask the shop to reset the BMS in VIDA without fee, since they should have done it already.

Those Zephyrus do add a different vibe to both vehicles, very cool to my eye! Sporty without being garish, big enough to fill the wheel wells just a little extra.

[pgill]

Michael,

I agree completely about the wheels. The design is really nice without being too distracting.


When I bought my S80 I did check the performance of the Alternator at Idle, you may want to do this.


Measure Voltage with

1. all electrical loads turned off

2. Headlights

3. Headlights +Radio

4. Headlights +Radio +Heated Seats (front)

5. Headlights +Radio +Heated Seats (front) + Heated Seats (back)

6. Headlights +Radio +Heated Seats (front) + Heated Seats (back) +Fan on High

7. Headlights +Radio +Heated Seats (front) + Heated Seats (back) +Fan on High +Rear Defroster



My S80 was able to maintain 14 Volts all the way thru step 7. (I can recheck this if you want to know the actual Voltage)
Note: the label on my Alternator indicated that it is a factory rebuilt part (I bought the S80 used)

My Land Rover with its original Alternator wasn't quite as good it dropped to 13.8 Volts I believe (I can recheck this if you want to know the actual Voltage)


Good luck

Paul

[DarkstarT6]

Paul,

So far so good. It's charging under load (not systematic methodology like you outlined though, just driving with accessories running), alternator is keeping supply voltage 13.6V to 14.6V. I think the next step is getting the BMS reset. I'll update after that step.

Thanks again for your help!
Michael