We bought a new (second hand) car and adopted some ‘niggles’ with it. One of those was that the <SET> button on the steering wheel control did not seem to work.
Centre info/set button did not seems to work.
Spoiler alert: Although I think the disassembly-clean-reassembly exercise was useful, as the button was sticking a little bit because of buildup of gunk in its working, I suspect that it was actually working to start with. Its just the button does not do a great deal by itself.
I found that if you hold the button while turning the key then you can get into some car settings (in Japanese) – you can change clock, turn on/off dial startup animation, set your birthday(?), set your anniversary(??).
To reset the trip computer (Trip A or B) you hold the <SET> button and simultaneously press the trip reset button in the dash. This is the ‘conventional’ one which I randomly noticed was there and was surprised to see. I had assumed all the electronic screen and steering wheel stuff would mean this conventional trip button would be superfluous. Kind of weird. Anyhow, to change trips you press that button – you dont seem to be able to reset trips and change trips through the screen system or steering wheel controls.
Youtube video below is pretty useful as a starting point – he is replacing the steering wheel.
Heed the video author’s advice to disconnect the battery and discharge as residual charge to avoid ‘testing’ the airbag.
I think the guy in video wings it with wrong type of screwdriver to open the two first captive screws either side of the wheel. I found them to be REALLY tight and would recommend getting hold of correct tool/ screw-head. Its a Torx T30 Socket.
Head of one of two T30 captive screws behind and either side of wheel. Very tight.
Torx T30 driver to undo screws. Would recommend getting hands on this rather than making do with something else.
Couple more phillips head screws. Could maybe leave these in but makes detaching button unit easier.
More screws – these ones actually fix the button unit in place, and the back shroud.
The back shroud (behind button unit).
Looking at steering wheel from side with shroud off.
Plug for buttons – joint plug for left and right hand button units, so no point in unplugging unless removing both units.
The detached button unit. THe button covers actually just click off (carefully!)
Pried open with plastic prying tool – needs some concentration. Units comprises the front and back covers, the electrical board and silicone rubber buttons (grey).
Front cover (back view) and silicone buttons.
No physical microswitches. Contacts embedded into silicone rubber buttons complete circuit. Three buttons are on the same circuit (i.e. one wire off plug). Different resistor values for each button allow system to detect which button pressed.
Front cover (front) showing where gunk had collected, impeding (maybe?) button operation.