Repair Porsche Cayenne 18-20 BCM 12V Lithium Battery by CG100/CG100X

After a severe accident or battery voltage too low, Porsche Cayenne 12V lithium battery turns to protection mode and cannot be charged which will cause the vehicle fail to start. It will take a lot to replace a new battery.

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How to solve Battery Discharge Protection problem in the cheapest way?

 

Here is the tutorial on reflashing BCM lithium battery module with cg100 prog iii or the upgrade version CG100X programmer to disable protection mode and recover the battery.

Lithium battery parameter information

There is a label on the front of the battery, which is marked with parameter information such as number, voltage, current and production date.

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Measure battery voltage

When the battery is not disassembled, we use a multimeter to measure the battery voltage, which is 0V, which means there is no voltage output, and the battery cannot be charged, that means the current cannot be input.

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Remove the battery case

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Measure battery voltage again

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After opening the battery case, the voltage is still 0V, without voltage output.

Measure voltage bypass the relay

Note that the relay is connected in series in the positive direction, we bypass the relay and continue to measure the voltage. At this time, the multimeter shows 1.92V, indicating that the battery has voltage, but it is blocked by the relay.

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Locate IC chip

You can see the IC chip when you open the upper case of the battery. This chip controls the operation of the entire battery. It is produced by Freescale and the model is SPC5644BMLU8.

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Battery Relay function:

The relay is controlled by the BCM. When the vehicle collides or the battery voltage is too low and enters the protection mode, the BCM cuts off the connection between the battery cell and the external battery terminal through the relay, so as to avoid battery over-discharge and cause danger or battery damage. The battery cannot be charged or discharged.

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How to Repair Porsche Lithium Battery with CG100?

Confirm battery year before the operation, for example, the battery was manufactured in 2018.

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Run CG100 software, select BCM- Porsche- lithium battery- Cayenne- 2018-SPC5644B

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CG100 will show you the wiring diagram

Connect battery with cg100 via BCM4+ adapter

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Make sure the connection is correct and well built.

Press ‘Read‘ to read data. First read PFLASH, then read DFLASH data. The process takes about 5 minutes.

DON’T DISCONNECT DEVICE DURING THE OPERATION !!!

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Save original PFLASH and DFLASH data.

The file saved contains both PFLASH and DFLASH data, file size: 1.56MB.

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Write data
Press ‘Write
Write PFLASH
Verify Pflash
Write DFLASH
Verify DFLASH
CG100 software will operate automatically, just wait for 10 minutes. 
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Note: CG100 and cg100x software comes with new pflash & dflash data for 2018-2020 Porsche Cayenne and auto write new data to the BCM battery.

After repair, test voltage again.

Connect voltage with an external voltage regulator

Bypass the relay and charge the battery with a precision regulated charger, measuring the voltage as it charges.

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Note: Digitally controlled adjustable power supply can be used for charging, the output mode can be adjusted to constant current output, first use a small current for charging (recommended below 3A), when the battery is charged to more than 12V, it can be charged with a large current until the battery is fully charged Calibration voltage.

Charge to regular voltage (12V)

remove the charger when the battery is charged to about 12V

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Reinstall battery, measure the voltage again

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Battery is charged. Install battery case, tighten the screws.
Measure voltage again, 11.92V.
Repair battery succeeded.

NOTE:
It is recommended to charge for one hour after being installed to the vehicle with a high-power charger.

 

 

CG100/CG100X Porsche 12V lithium battery pinouts:

2017-2020 Cayenne SPC5644B

Cg100 Porsche Battery Repair Pinout 1

Porsche Taycan MM9Z1J638 pinouts

Cg100 Porsche Battery Repair Pinout 2 Cg100 Porsche Battery Repair Pinout 3

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FYI: Xhorse also released Porsche 12V Lithium Battery  repair function:

Can be applied to vvdi prog, key tool plus and mini prog.

Data and detailed diagrams are well prepared in the built-in database.

Xhorse Repair Function For Porsche 12V Lithium Battery Issue

VVDI Prog Porsche Lithium battery module SPC5644B Mask ON32E wiring diagram

Porsche Lithium Battery Module Vvdi Prog

 

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