How to Replace the Battery in a 2004 Mazda 3 Key Fob
If your 3 remote key fob is not unlock doors correct, the cell battery probably must to be changed. Yes, it is possible to change the battery in your remote key fob, and it’s easier than you think. Everything you need is outlined in this post.
What type battery remote key fob requireReplacing battery in keyless entry remote require one CR2025 battery and flat head screwdriver. Prepare these materials and tools before opening and make sure to match the size of your keyless entry fob's batteries.
- 1xCR2025 battery
- flat head screwdriver
Step by step guide
Inside of your keyless entry remote installed tiny coin battery. Carefully try to disassemble your keyless entry remote with flat head screwdriver. Remove 1 CR2025 battery with flat head screwdriver.
Change old battery with fresh one CR2025. Every battery has a negative and positive side and if you put the wrong connector down, the current cannot go into your circuit board and make it work. Check position on battery, by "+" mark.
When the new battery installed, verify remote key fob functionality by pressing buttons. If all functions works, assemble your keyless entry fob's shell in reverse order.
At this point squeeze keyless entry fob's back cover together. Line your body two halves together and put it in place by hands from top to bottom. Inspect your keyless entry remote shell for gaps. If it is not tightly closed try to repeat last step.
Video of keyless entry remote opening
Mazda 3 Rectangular Key Fob Battery Replacement (2004 - 2008)