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The Door Remote Unlock Does Not Operate RF Functions

WARNING: This page is about a different car, the 2019 Fiat 500X. However, it is still accessible from the selected car via links, so may be relevant.
STEP OPERATION TO BE CARRIED OUT OK (NO FAULTS DETECTED) FAULT DETECTED OPERATION
1 DOOR LOCKING/UNLOCKING FROM KEY CONTROL OPERATION CHECK 
  • Check that the door locking/ unlocking RF transmission is working correctly
End of diagnosis The key does not operate the door locking/unlocking locks Go to Step 2 
2 KEY CONDITION CHECK 
  • Check the condition of the button and the key casing
Go to Step 3  Button and casing damaged/ tampered with Replace the key
3 KEY RECOGNITION CHECK 
  • Check the power transmitted with the test receiver, code no. 2000040922 
End of diagnosis The key does not transmit any signal Go to Step 4 
4 BATTERY POLARITY CHECK WHEN INSERTED IN THE KEY 
  • Check that the battery is inserted in the key, respecting the correct polarity
Go to Step 5  Battery inserted incorrectly (reversed polarity) Reposition the battery according to the correct polarity
5 BATTERY CHARGE CHECK 
  • Connect a multimeter to the battery poles checking that the voltage is higher than 2.2 V.
Go to Step 6  Voltage lower than 2.2 V detected Insert a new battery
6 KEY/BATTERY ELECTRICAL CONTACT CHECK 
  • Remove the battery and check the condition of the contact sheet.
  • If there are no faults in the contacts, the problem is inside the key; therefore it is necessary to replace the key.
End of diagnosis Sheets distorted/damaged Replace the key