Additional Battery Fault
i have this fault code on mercedes G class (B11C118:the additional battery is faulty,the limit value for current is not attained,)
i remove the additional battery and i measure voltage it gives 12,5V.
Anybody facing this problem before?
That was the OCV on the battery, what voltage did it have under a load, such as a carbon pile load test?
Great question....when in a rush we often pass over the load test....load testing the circuit to me is the best test for overall circuit integrity
You will have to check it under load since the computer is telling you "current", not "voltage"
Load test that acucilary battery you probably find it will fail a sign is the start and stop will be working intermittently best way to load test is while stating from start stop action
Aly, As others have stated you'll want to load test that battery. Open circuit voltage isn't a clear indication of battery health. Much like voltage drop testing circuit with no current flowing. I'm also curious what pids are available for the auxiliary battery system. Chances are you can monitor battery voltage and current on the scan tool during attempted start-stop as well as charging system…
If it's any help I just replaced an additional battery in a '15 GL450. According to the iScan the internal resistance of the battery is 60 ohms (new battery). Had code B 11c11b. Neither the code nor the message returned.
Do you have access to repair manuals for this car ? If you're not familiar with Stop/Start Systems, here's a link to an explanation. You might want to do some further reading for your specific make. Stop/Start batteries from some manufacturers have different recommended testing methods. aa1car.com/library/stop-s… I would test the auxilly battery & system according to…
Since the circuit is live, why not disconnect the battery totally and test for voltage at the charging terminals and see how the voltage behaves, I've got an issue like that before, ad and the problem was that one of the wire was have an intermittent contact with ground. So it was really difficult to notice, I have to connect a voltmeter and then wiggle the wires around that area before I could…