Replace a defective key fob with two (2) fob remote controllers for a cost of six (6) dollars!!! I have done this on a Honda Civic 2006. For some unknown reason, the key fob remote controller for my Honda Civic 2006 suddenly stopped working. I replaced the battery but still it would not work. Because replacing the original key fob is very expensive, I decided to find another solution. The solution – install a new keyless entry system or central door lock system.

There are many cheap keyless entry systems on the internet and they usually come with two (2) fob remote controllers. The one that I bought and installed is shown in the picture above. It was around $6 then when I bought it here. It is already sold out but it is available in great quantity from China.

Why and How the Trick Works

When a key fob remote controller fails to lock or unlock the doors, you can manually lock or unlock them. Use the ignition key to lock or unlock the driver’s door. Using the ignition key on the driver’s door latch has the same exact effect as the key fob remote. It locks or unlocks the doors and at the same time arms or disarms the security alarm system. By design, the ignition key is the backup for the key fob remote controller.

The driver’s door latch has a switch that the ignition key turns to either Lock or Unlock position. If we connect a new keyless entry system like the one pictured above to the driver’s door latch switch, we can simulate the locking and unlocking of the doors by the ignition key. Consequently, we can now lock and unlock the doors (also arm and disarm the alarm) by using the new keyless entry system’s two (2) brand new fob remote controllers. In effect, we are able to replace the defective key fob with two new fob remote controllers.

Keyless Entry System on Honda Civic 2006

The diagram below shows how the different door lock switches are connected to the MICU (Multiplex Integrated Control Unit) that controls the locking and unlocking of the doors in a Honda Civic 2006.

For a complete circuit diagram of Honda Civic 2006 Keyless System, Power Door Locks, and Security System, please see Honda Civic 2006 Security System Diagrams

How to Install the Keyless Entry System to Replace a Defective Key Fob

On a Honda Civic 2006, it is very simple to connect the keyless entry system. As shown in Figure 2, we only need to connect four wires. Please refer to Figure 1 and Figure 2.

• YELLOW/GREEN wire to Driver’s Door Key Cylinder Switch LOCK wire (PNK)
• BLACK/WHITE wire to Driver’s Door Key Cylinder Switch UNLOCK wire (BRN)
• RED wire to Car Battery’s Positive Terminal
• BLACK wire to Chassis Ground

The RED wire for the positive12V supply must be wired to an unswitched 12V supply. If the keyless entry system control unit is to be installed under the dashboard near the ignition key switch, a good place to get the 12V is from the BATTERY terminal of the ignition key switch.

Note that there is no need to connect the two (2) GRAY wires to the LEFT and RIGHT turn signal lights. The existing keyless system will blink the turn signals when locking and unlocking the doors.

If you want a chirp sound when locking and unlocking the doors, you may want to connect the PURPLE wire to a siren horn.

References on Replace a Defective Key Fob for Six Dollars

Honda Civic Wiring Diagram
Honda Civic 2006 Security System Diagrams
Honda Civic Turn Signal/Hazard Flasher Circuit Diagram

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