2004 Nissan-Datsun Sentra SE-RFACTORY OEM SERVICE PROCEDURE

Electronic Key Battery Replacement: Notes

WARNING: This page is about a different car, the 2004 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Electronic Key Battery Replacement
G00744220Courtesy of NISSAN MOTOR CO., U.S.A.
  1. Remove the mounting screw on the back side of the electronic key, and insert a slotted coin into the emergency key slot. Twist the coin to separate the upper body from the lower body. Then take out the electronic key transmitter.
CAUTION: During disassembly, do not impact the transponder on the lower body.
  1. Insert a slotted screwdriver wrapped with tape into the electronic key transmitter (A) and twist the screwdriver to disassemble the transmitter.
  2. Replace the battery fixed on the lower body. Be sure to install new battery properly with the positive side facing the lower case.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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