Sunday, May 11, 2014

Opel Astra H sport button

In my Astra H there is a button which controls a park assist radar, some other versions of Astra H have a "sport" button there which changes a gas pedal, suspension (if car is equipped with IDS) and traction control settings.
I wanted to change the middle console module for a one with a "sport" button but I couldn't find any information if the middle console module in both variants (with parking radar and with "sport") has the same circuit - is this only a matter of a sign on a button and activating the right option in cars ECU or it is needed to change button module to be able to activate "sport" button?
I bought a middle module with "sport" and did a short investigation, here is the disassembled module:

Here is connector with pin numbers which I assumed:
And here is a reverse-engineered circuit diagram:
Safety related features in a car have additional diagnostics. Sport button is safety related because of influence on cars traction and for this reason there is additional 1k resistor across the switch so ECU can detect if the button connected correctly. If button is missing then most probably ECU will switch off this potentially dangerous sport mode. Door lock button and hazard lights can't directly cause a harm and they don't have this additional 1k resistor.
I didn't took the regular module without sport button yet but I will put here a circuit diagram and circuit comparison when I do this.

5 comments:

  1. Hi! Thanks for this circuit diagram, so if I want to use the SPORT button as a on/off switch, should I connect +/- to pins 1 and 7?

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    1. You will have to connect a momentary switch with a 100 Ohm resistor in series and 1 kOhm across the complete circuit (pins 7-1). You car expects that there has to be 1 kOhm resistor (the topmost one from the circuit diagram above), otherwise it will complain that there is no switch at all.

      Apart from that you will have to activate this function, I used a Tech 2 interface for that.

      You could add a diode with a resistor between pins 15 and 1, it will lit up when sport mode is activated

      Another thing is, if you don't have adaptive suspension this button will actually allow you to turn ESC off when pressed and hold for a few seconds. Don't expect too much:)

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  2. Thinking of using my sport button to open/close the valve on a varex exhaust aswell. Think that would be possible, and if so, how? :P

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  3. The resistors value, is not correct!!!!!!
    The led is ok.
    But the switch is not.
    The correct way is connect the ground and the sport signal with a 1.7k and serial with that 120 ohm. The switch is paralell with the 1.7k.
    I tested that way and working 100%

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    Replies
    1. I would like to wire the sport button to be an on/off switch for a dashcam wired in. Any advice on how to tackle the sport button re wiring?
      Thank you guys

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