Let’s say you swapped an instrument cluster from a coupe to
a sedan to change the look or color of the needles, or you’re replacing a defective cluster. The mileage on most (Japanese) cars is stored on the instrument cluster itself, and not in the ECU. Therefore the mileage of the original vehicle that the cluster was from will be displayed on the dash.
a sedan to change the look or color of the needles, or you’re replacing a defective cluster. The mileage on most (Japanese) cars is stored on the instrument cluster itself, and not in the ECU. Therefore the mileage of the original vehicle that the cluster was from will be displayed on the dash.
Odometer information is stored on a small EEPROM chip on the circuit board. The chip can be read and written to using a serial programmer. The information is coded in HEX characters.
The odometer information can be copied over from the old cluster to the new cluster using Honda HDS, assuming the original cluster is operable. What follows is a hack-around to using HDS, by programming the mileage directly to the chip. You can also opt to merely swap the chips, or copy and paste the program, rather than decode.'
Tools and Parts Required:
• Screwdrivers
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• Soldering iron, solder and a de-soldering pump
• Computer with Windows XP and serial port
• 8 pin DIP socket
• Serial programmer
- Breadboard
- Hookup wire
- Female serial port header
- 5V from computer power supply
- 4.7K ohm resistors
- 5V Zener diodes
o Wire strippers
• Serial programming software (PonyProg freeware)
• A spare instrument cluster in case you screw up
Here's the original instrument cluster from my LX sedan, 314,622 km, and here’s my new cluster. It’s from an EX-L sedan with 211,150km.