Mercedes 2015 - W212 - 220Cdi. Auxiliary Battery

If you are not a PicoScope user and want advice with a diagnostic problem then post here. Forum members may be able to help.
Post Reply
Iver
TwoWaves
TwoWaves
Posts: 182
Joined: Mon May 27, 2019 2:55 pm

Mercedes 2015 - W212 - 220Cdi. Auxiliary Battery

Post by Iver »

I have this car with an Auxiliary Battery Internal Resistance Fault.

In live data it seems to be happy when the resistance is below 1ohm, then it will jump to 2.55 and throw the fault and the warning will appear in the cluster.

I suspect that 2.55 is not correct, more so the equivalent of Hex "FF" and the max / default value it can read.

Anyone have the specs / setting criteria for for this fault.

The Voltage in the battery is perfect, sits near 13v, ignition off for a long time.

Post Reply