Enabling Trip Computer (only works on B-series (05-06) Mazda3 Maxx and above) Note: this mod ONLY WORKS on
B-Series(05-06) Mazda3s of only Maxx spec. and above
Sorry Neo owners!
This also works for those with Luxury Packs (Bose sytems).
It appears limited to head units (HU) supplied by Clarion, which were only in this period of Mazda3 production.
So if yours isn't a Clarion you won't be successful.
Before others ask or try it out,
it will not work on A-Series(04-05) models of any kind, as they do not have the physical wiring loom in place. Sorry guys!
It will not work on C-Series (06-07) models of any kind, as they have different HUs and we can't unlock them (yet...!) What it does:
Enables the fuel trip meter (very left hand side of the LCD panel, where the clock is usually displayed):
This was never an offering from Mazda in any Australian Mazda3, for reasons stated above.
However, these specific HUs in the B-series have the system built in. It's dormant and only needs activating.
It displays 4 selectable fuel usage readouts, changeable using the 'SET' key:
1) Instantaneous fuel consumption in L/100km
2) Average fuel consumption in L/100km
3) Estimated distance to empty
4) Average speed in km/h
How do I do it? Method 1:
1) Get in, close door.
2) Insert key - DON'T TURN.
3) Hold down the 'FM1/2' or 'AM/FM' button together with the CD button. Keep them held down.
4) Turn key to ACC. Display reads 'Hello' immediately followed by 'DIS ON' (Driver Information System - On).
You might also find success turning the engine on at this stage.
5) Press the 'SET' key for at least 5 seconds. You should hear a beep.
6) Turn engine off, then back to ACC (or turn engine back on)
7) Press 'SET' again to cycle through the functions. Press 'CLOCK' to return to the clock. Press 'SET' again for the fuel trip computer.
To reset the meter, just hold down the 'SET' button on whichever mode you want reset.
Method 2:
1) Before starting the engine, keep the 'CD' and 'FM1/2' buttons pressed.
2) Start the engine.
3) After 5 seconds, you should see 'DIS ON'
4) Stop the engine.
5) Start the engine again.
6) Now, you should have your fuel computer activated.
7) Press 'SET' again to cycle through the functions. Press 'CLOCK' to return to the clock. Press 'SET' again for the fuel trip computer.
To reset the meter, just hold down the 'SET' button on whichever mode you want reset.
(This has been working in the US, has worked for some here).
Method 3: (Thanks ZOOM'N23) - Official Mazda Instructions, apparently!
1) To turn the trip computer on...
2) Start the car
3) Turn on the stereo - while the stereo is on, press the 'FM1/2' button at the same time as the 'CD' button for about 5 seconds.
4) You should then get a message saying 'DIS ON'
5) At that point, turn off the car and turn it back on to see if the trip computer has actually been activated.
Method 4: if all else fails...
A few of the guys in the US have had some luck with pressing the 'SET' button on the stereo and the 'VOLUME +' button on the steering wheel with the ignition in the 'ON' position.
(It was found that pressing the 'AM' button and 'MEDIA' buttons with the ignition on it displays 'DIS OFF', but this did not swich the trip meter off).
No guarantees this'll work at all...
Please be patient. Sometimes it takes a few goes to get it to work.
But on some, it doesn't work at all. Seems to be dependant on the Head Unit you have.
And this is why Mazda doesn't offer it as an official option.
Hope one of these solutions works for you. I will update methods and info as more comes to hand.
Good luck!
Other HU options: (Thanks to SilverSP & Jason):
LCD Test: PWR + Seek Up
Button Test: PWR + Clock
Speaker Test: PWR + Text (Right Knob)
Firmware: Audio Cont + 1
Antenna On: PWR + AM
Radio Signal: PWR + 2
Screen contrast: Audio Cont (Left Knob) + Tune-audio-M disp button (Right knob).
Hold them until it beeps and the screen will show contrast 9.
Turn the Audio Cont (Left knob) to adjust the screen contrast up (to a max of 15) or down (to a minimum of 1).
No Idea what the following does:
PWR + Seek Down
PWR + 5
PWR + 6
Many thanks to many OMCers for digging this one up!
MZ3_Pilot, DJIntegr8, KBlume, SilverSP, Jason and others. Instructions for operation: Trip Computer
The trip computer can display the following:
• The current fuel economy.
• The average fuel economy.
• The approximate distance you can travel on the available fuel.
• The average vehicle speed.
The ignition switch must be in the ON position.
Press the 'SET' button to change the display mode.
NOTE: When the time is being displayed, press the 'SET' button to change the display to the trip computer.
Current fuel economy mode
This mode displays the current fuel economy by calculating the amount of fuel consumption and the distance traveled.
Current fuel economy will be calculated and displayed every 2 seconds.
When this mode is selected, 'CONSUM CUR' will be displayed.
When you've slowed to about 5 km/h (3 mph), —— L/100 km will be displayed.
Average fuel economy mode
This mode displays the average fuel economy by calculating the fuel consumption and the distance traveled since connecting the battery or resetting the data.
Average fuel economy will be calculated and displayed every minute. When this mode is selected, 'CONSUM AV' will be displayed.
To clear the data being displayed, press the 'SET' button for more than 1 second.
After pressing the INFO button, —— L/100 km will be displayed for 1 minute before the fuel economy is recalculated and displayed.
Distance-to-empty mode
This mode displays the approximate distance you can travel on the remaining fuel based on the fuel economy.
The distance-to-empty will be calculated and displayed every minutes.
When this mode is selected, 'REMNG' will be displayed.
NOTE: Even though the distance-to-empty display may indicate a sufficient amount of remaining mileage before refueling is required.
Refuel as soon as possible if the fuel gauge needle nears E or the low fuel warning light illuminates.
The display won't change unless you add more than approximately 20 L of fuel.
Average vehicle speed mode
This mode displays the average vehicle speed by calculating the distance and the time traveled since connecting the battery or resetting the data.
Average vehicle speed will be calculated and displayed every 10 seconds.
When this mode is selected, AV will be displayed.
To clear the data being displayed, press the 'SET' button for more than 1 second.
After pressing the 'SET' button, ——km/h will be displayed for about 1 minute before the vehicle speed is recalculated and displayed.
Only for 06+ Models
1. Get in car and close door.
2. Put key into ignition (DO NOT TURN YET!)
3. Hold down the AM/FM button AND the CD button.
4. With your other hand (while still holding the buttons) turn your key to the ACC position. The Hello message will appear on your display, and as soon as it goes away it will be replaced by DIS ON.
5. You may now let go of the AM/FM button and CD button.
6. Turn ignition off.
7. Turn your car on and drive away!
PS. You will note that you will need to push the "Set" button to toggle through the different Driver Info modes
"I love your buns" 
Linear Mode
