You cannot meaningfully test the Intelligent Battery Sensor and not with a multimeter. One might think of checking the precision resistor, it will indicate a short and the only resistance observed with a multimeter is the resistance of the test leads. The resistor causes a small, perhaps 5 VDC with the thousand Amps of starter current passing through it.

The IBS communicates ’current’ into and out of the battery via LIN bus to the ECU DME. The IBS communicates system voltage via LIN bus to the ECU DME (the only voltage reported to the DME). The IBS communicates battery temperature to the ECU DME for best battery charge performance.

My free advice is to get your BMW to your authorized BMW Service Center franchisee and ask them to fix it. Customer states: BMW fails to start. Customer has interfered with the IBS. Diagnose, troubleshoot, estimate, and repair on acceptance of the estimate.

I operated, tested and repaired machinery of comparable complication to a BMW for 25 years. The essence of being an engineer is not knowing all of the answers, but of knowing where to find all of the answers. A mentor taught, “A wise man knows the right answer when he hears it!”

Index	Explanation
1	Printed circuit board
2	Temperature sensor
3	Microprocessor with software
4	Precision resistor

Pin assignments

Pin	Explanation
LIN	LIN bus
Kl. 15 WUP	F0x, F1x only: Terminal 15 wake-up
Terminal 30	12 Volts, power supply
Terminal 31	F0x, F1x only: Ground connection

Note! The wake-up line to the intelligent battery sensor is omitted! F2x, F3x: The wake-up line for the latest generation of the intelligent battery sensor is omitted. Wake-up takes place via the LIN bus. The plug connection has 2 pins.

 

You cannot meaningfully test the Intelligent Battery Sensor and not with a multimeter. One might think of checking the precision resistor, it will indicate a short and the only resistance observed with a multimeter is the resistance of the test leads. The resistor causes a small, perhaps 5 VDC with the thousand Amps of starter current passing through it.

The IBS communicates ’current’ into and out of the battery via LIN bus to the ECU DME. The IBS communicates system voltage via LIN bus to the ECU DME (the only voltage reported to the DME). The IBS communicates battery temperature to the ECU DME for best battery charge performance.

My free advice is to get your BMW to your authorized BMW Service Center franchisee and ask them to fix it. Customer states: BMW fails to start. Customer has interfered with the IBS. Diagnose, troubleshoot, estimate, and repair on acceptance of the estimate.

I operated, tested and repaired machinery of comparable complication to a BMW for 25 years. The essence of being an engineer is not knowing all of the answers, but of knowing where to find all of the answers. A mentor taught, “A wise man knows the right answer when he hears it!”

View attachment 1110277

Index	Explanation
1	Printed circuit board
2	Temperature sensor
3	Microprocessor with software
4	Precision resistor

Pin assignments

Pin	Explanation
LIN	LIN bus
Kl. 15 WUP	F0x, F1x only: Terminal 15 wake-up
Terminal 30	12 Volts, power supply
Terminal 31	F0x, F1x only: Ground connection

Note! The wake-up line to the intelligent battery sensor is omitted! F2x, F3x: The wake-up line for the latest generation of the intelligent battery sensor is omitted. Wake-up takes place via the LIN bus. The plug connection has 2 pins.

If you were me, would you buy a IBS sensor/cable to see if that resolves the issue ?

So I sorted his folder and categorized the screenshots and created a pdf for Fault Codes and Test Plan.

What stands out the most is:
-Replace DME
-IBS sensor
-Icing of relay integrated supply module

David kept complaining that the fuel pump won't turn on.

He can't afford to have the car towed to the dealer and have them work on it and works on the car little by little when he gets home from work. The car will sit here for another month unless I get involved so thank you so much to anyone who can offer any insight.

 

8020DB Wake-up line to IBS, short circuit to ground or open circuit
801410 CON No current coding data stored
801A4C SINE: under voltage detected in internal voltage supply
93076B Deactivation of terminal 30B, upper storability limit reached
93076B Deactivation of terminal 15, upper startability limit reached, but deactivation preventer active.
D02D58 Signal (wheel torque powertrain 1 41.3.4) invalid transmitter DME / DDE
D014A1 Signal (actual position EPS, 51.0.2) invalid transmitter EPS
CD8E10 LIN bus: Communications fault
109001 Coolant temperature sensor, electrical: Short to B+ or line disconnection
108A01 Charge-air temperature sensor, electrical: Short circuit to B+
1C3002 Engine-oil pressure sensor, electrical: Short circuit to earth
1C3102 Engine-oil pressure sensor, plausibility: Pressure too low before engine start
119001 Rail pressure sensor, electrical: Short circuit to B+
8011C1 Favorite button 1: Continues operations detected
138102 Exhaust flap, activation. Short circuit to each
121001 Charging pressure sensor, electrical: Short circuit to B+
1C3101 Engine-oil pressure sensor: plausibility: Pressure too high before engine start
1B5302 Supply, terminal 15N_2: Short circuit to ground
1B5402 Supply, terminal 15N_3: Short circuit to ground
101202 Throttle valve, throttle potentiometer 2, electrical: Short circuit to ground
101001 Throttle valve, throttle potentiometer 1, electrical: Short circuit to B+
100A04 Consequent reaction: Throttle valve, throttle potentiometer 1 and 2, Doble fault
107A50 Consequent reaction: throttle valve: Emergency operation mode active
1B5202 Supply, terminal 15N_1: short circuit to ground
1F0515 Valvetronic, supply voltage Line disconnection
801C20 ZGM: central fault memory full -no control-unit fault
930994 Safety battery terminal: Resistance too high
C90D60 AUC sensor: internal sensor fault
9030E8 Reset or deactivation of terminal 30F
133104 Valvetronic relay, activation: Line disconnection


Any advice would be greatly appreciated!

 

Learn to use FREE ON-LINE BMW Fault Code Lookup - BMWFaultCodes and its Service Plan with troubleshooting. Note here that the IBS is not interfered with.

8020DB

Wake-up line to intelligent battery sensor IBS: short circuit to ground or open circuit

jbbf3

Junction Box Electronics

View

Fault Information

Fault Code Description
Diagnosis monitors the wake-up line between the junction box electronics (JBE) and intelligent battery sensor (IBS). The fault is entered when there is a short circuit to ground or open circuit on the wake-up line.

Fault Code Conditions
General Conditions	Supply voltage between 10.5 and 16 volts.
Terminal Condition
Driving Conditions	Active bus communication.

Fault Time Condition

Service Plan
Check following line and plug connection: Wake-up line on the JBE, connector A34*2B pin 45. Wake-up line on the IBS.Voltage supply from IBS. If applicable, repair the wiring or plug connection.

Fault Impact

Warnings
Warning Lights
Control Center Messages

Service Notes

© 2024 - BMWFaultCodes

 

Thank you so much for the reference. I'll go through each code and complete the action.

 

I forgot to ask, have you ever heard of this buzzing sound coming from the engine bay? It's on when the car is in accessory mode or turned off and locked. The only way to make it stop is to disconnect the battery.

I tried to upload it here but am getting an error message that the file does not have an allowed extension. The file is called Buzzing.MP4. Here is the Youtube link:

 

Figured out the buzzing. The plugs on top of the positive battery terminal weren't plugged in all the way. The fuel pump still won't prime when unlocking the car, but a big relief. I'll try to reset the codes and test again. Will post update

 

I've been trying to solve this problem all day:

The car says "Battery discharging while stopped: Electrical devices were temporarily switched off."

The 'smart charger' says the battery is 100% full and the charger is always connected to the terminals inside the engine bay while diagnosing the car.

The battery tester reads 620 cold cranking amps and 12.64 volts. Yes, the voltage and cold cranking amps need to be higher, but is it low enough to where the car would "switch off electrical devices" ?

Also, why does the smart charger say 100% charged when the cold cranking amps are only at 620 but the battery is rated at 850, and the voltage is only at 12.63 (85% full) when a 100% charge is at 13 volts. Is the charger, tester, or car at fault?

I'm wondering if this has something to do with the fuel pump not priming when the car is unlocked. When the Start button is pressed, the starter cranks fast, but the car won't start. A new battery was purchased and coded with ISTA+, but still the fuel pump won't turn on. Wondering why the "Battery Discharging while Stopped: Electrical Devices were Temporarily Switched Off" warning shows on the car monitor ?

Thanks in advance!

 

CCA is a manufacturer’s performance capability specification, not an indication of battery condition. 12.64 VDC system volts is only normal, not indicative of anything. For battery voltage to be an indication of battery condition, it must be completely disconnected from the system and allowed to rest IIRC three hours.

Battery discharging while stopped is notice that excessive current is being drawn while the engine is off, typically an improperly integrated aftermarket component or a module not sleeping properly. Identification of the root problem is difficult and the topic of the final chapter of BMW’s Advanced Vehicle Diagnosis. FREE ON-LINE BMW Advanced Vehicle Diagnosis

BMW Technical Training Documents : Free Download, Borrow, and Streaming : Internet Archive

BMW documents including,ST034 E46 Complete VehicleST035 1999 System DiagnosisST036 X5 Complete VehicleST037 M5 Complete VehicleST038 Z8 Complete VehicleST039...

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As the condition of the battery degrades due to the excessive open circuit current, consumer devices are switched off to protect startability - the ability to start the car one more time.

I glanced at your collection of DTC and did not notice one referring specifically to the fuel pump, but did notice some referring to terminal errors.

again, you must use a BMW hexadecimal Diagnostic Trouble Code reader, not noises and such. From where did you get your collection of DTC?

 

As my account is recently created, I'm unable to initiate private messages. I have an intriguing proposal to share with you. Would you consider reaching out to me so I can share the details?

 

I'm impressed by your profound understanding, and I appreciate you sharing your insights.

Initially a Launch x431 Elite BMW diagnostic tool was used but afterwards ISTA+ was installed and has been the only tool used to diagnose and code the replacement battery.

 

I carefully - I think reviewed - your DTC error codes and do not see an indication of Intelligent Battery Sensor problems.

BMW E70 X5 xDrive35i SAV / Repair Manuals and Technical Data / 61 General vehicle electrical system / 61 20 Battery /
61 12 ... Information on intelligent battery sensor (IBS)

• For this reason, only exchange the IBS when there is a corresponding fault code entry!

Messing with the IBS is wrong. Mess with the IBS and you are on your own.

 

Thank you for the insight. I will cancel that action plan immediately.

May I ask what you might look into first?

 

Communication errors, LIN bus errors.