Losing all keys to your Citroën Jumper 2021 can be a frustrating experience, but with the right tools and knowledge, it’s possible to program a new key. Below is a step-by-step guide based on a real-world procedure performed by an automotive locksmith.
Tools and Equipment Required
- VVDI Key Tool Plus – Necessary for direct key programming.
- EEPROM adapter – Used to read and write data from the immobilizer chip.
- Soldering equipment – For carefully removing and reinstalling the chip.
Step-by-Step Procedure
1. Accessing the Immobilizer Module
- The immobilizer module in the Citroën Jumper 2021 is located behind the dashboard.
- Carefully remove the casing by releasing the side and top clips to avoid damaging the connectors.
2. Removing and Reading the EEPROM Chip
- Locate the EEPROM chip (95640) on the immobilizer board.
- Desolder the chip gently to avoid damaging the circuit board.
- Solder the chip onto an EEPROM adapter to read its data.
3. Extracting Key Data and PIN
- Identify the stored key data and extract the vehicle’s PIN code.
- The dump revealed two existing keys, but the goal was to program four new keys.
4. Writing Key with vvdi key tool plus
- Prepare new key transponder chips by writing the extracted PIN and new key data.
- Each key was programmed sequentially, with the fourth key added to the immobilizer’s memory.
- Verify that all four keys were successfully written before proceeding.
- Save new key data
5. Write new key data back to EEPROM
- Write the new key data back to eeprom.
6. Testing the New Keys
- Solder the EEPROM chip back onto the immobilizer board.
- Reassemble the module and reconnect it to the vehicle.
- Repeat the test with the second, third, and fourth keys to ensure all work correctly.
Done.