Electrical - Advanced Onboard Battery Diagnostics
SI B61 02 11General Electrical Systems
March 2011
Technical Service
SUBJECT
Advanced Onboard Battery Diagnostics
MODEL
F01, F02 (7 Series) produced from 9/2010
F10 (5 Series)
F25 (X3)
F07 (Gran Turismo) produced from 9/2010
INFORMATION
Starting with the introduction of the F10 (5 Series), an advanced intelligent battery sensor has been used. This now makes it possible for the vehicle to monitor the condition of the battery in order to determine if the battery needs to be recharged or replaced, along with the remaining capacity of the battery. The analysis and testing of the battery's SoC (State of Charge) and SoH (State of Health) is now performed using ISTA (Integrated Service Technical Application) diagnosis. A separate test using a battery tester is no longer needed.
PROCEDURE
In order to properly test the battery, follow the procedure as outlined below.
1. Perform a vehicle test and identify any power management faults stored in the vehicle.
If the battery is faulty, one of the following fault codes will be stored in the DME:
^ 213B01 - Power Management, battery condition: Battery faulty
^ 213B08 - Power Management, battery condition: Battery faulty
^ 29B500 - Power Management, battery condition: Battery faulty
If no faults are stored, continue to step 4.
2. Complete the test plans that are linked to the faults and follow the test plan recommendations. This includes the test plan "AT6121_FZGBATT - Battery Status" and "AT6100_END_L6 - Energy Diagnosis". Refer to and ISTA functional description documents for additional information on energy diagnosis. If the battery needs replacement, the test plans will prompt to "Install the following component: Battery" and supply the DAIGCODE.
Note:
On vehicles prior to July 2010, the IBS (Intelligent Battery Sensor) can lead to erroneous readings. The test plan "AT6121_FZGBATT - Battery Status" automatically reads the SW data from the IBS and prompts for the IBS to be replaced as needed. In this case, the battery should not be replaced unless prompted by the test plan.
3. After a battery replacement, the fault codes can only be cleared after the battery is registered. The battery registration can be completed using the test plan "AS6120_WECHSEL -Register battery replacement". The test plan can be found under "Service functions/Body/Power Supply/Battery/Register battery change".
4. If the vehicle test does not identify any power management faults stored in the vehicle, the battery status can be checked by performing the test plan "AT6121_FZGBATT - Battery Status" using ISTA. The test plan can be found under "Function structure/03 Body Voltage supply/Battery/Battery condition". Follow the recommendations of the test plan, noting any DIAGCODES.
WARRANTY INFORMATION
This service information bulletin is intended to provide technical diagnostic and/or repair information. Claims that result from the repair of a verified defect are to be processed following established warranty policies and procedures.