On 90 - To make the horn and cruise functional again.

Discussion in 'Gen 1 & 2 - Electronics & Audio' started by boat, Dec 14, 2013.

  1. boat

    boat Likes blue ones

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    What all parts are needed for cruise control to work on a SHO?

    I am working on rounding up these parts for my 90. Apparently at some point, someone removed cruise control from this car. I know it needs the big round diaphragm that all the air hoses run to, and the air hoses, too. Anything else? I have the stock steering wheel back in the car. I am wanting to put the horn back in too, that is missing as well.

    If I found these parts off of another year gen 1 or 2, would they have the same electrical plugs?
     
  2. tommyturbo

    tommyturbo SHO Member

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    the mtx cruise module (round diaphragm with cable) is same from 89-95. The airbag clock springs are the same from 90-92, the wiring on the airbag plug changed in 93 with the new style wheel, so it's clock spring is different. However the wiring for the air bag can be spliced between styles with no problems, I've put old style square airbag wheels in my 95's. The cruise and horn plug did not change at all from 90-95 that I can see.
     
  3. rubydist

    rubydist SHO Master Staff Member Super Moderators

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    but you should verify that the clockspring is good before connecting the airbag, since you don't want it blowing in your face due to a short in the clockspring!!
     
  4. boat

    boat Likes blue ones

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    How do you verify the clock spring is good?

    When I put the wheel back in this past summer, I put an unknown (good or bad) clock spring, I put back in the airbag sensor that goes on the front core support, I plugged in the sensor that has to be plugged in at the top middle of the firewall. Put back in the air bag blue box in the dash, I turned the key and the air bag light started flashing. I never counted how many times it flashed. But then unplugged the blue box for the possibility the air bag could explode.

    Is it more likely that it is the clock spring than say the blue box? I do have a spare clock spring from another 90.
     
  5. tommyturbo

    tommyturbo SHO Member

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    could be either. you can test the continuity of the clockspring, but it could be bad as your turn the wheel and be good other times. I had a bad blue box and it cause the light to flash incessantly. the system is very particular about resistances.
     
  6. TimboSHO

    TimboSHO Novice

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    Plug it back in and count the flashes. That will at least get you on the right track.
     
  7. rubydist

    rubydist SHO Master Staff Member Super Moderators

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    its a little challenging to test the clockspring, as you need to measure resistance as you turn the wheel from full left to full right, etc.

    I agree with the advice to count the flashes so you know about what it is complaining.
     
  8. boat

    boat Likes blue ones

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    Okay. Thanks, guys.

    Was I correct on the parts needed? Or are there still more parts that I need to have the cruise control system complete? Are the electrical plugs the same between all the years?


     

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