Electrical & Lights LED brake lights with lights on = no cruise control

Discussion in '7th Generation (2003-2008) [Acura TSX]' started by speeding_ant, Thursday 29th Jan, 2015.

  1. speeding_ant Club Member ★ ☆ ☆ ☆ ☆

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    Huh, well how about that... After installing new LED brake lights (dual filament 7443 type) it appears that cruise control doesn't work if you have your lights on. Works perfectly otherwise.

    I did some reading, it looks like perhaps the LEDs are not drawing much current when the lights are on, so *A* system thinks your brake lights are out. Cruise control will cancel if you touch your brakes. From this, I can only assume they're tapping into the light circuit? I have to wonder, why would Honda design a system like this, when you'd think it should really be based off a hydraulic pressure switch from the brake servo...

    Any ideas? Apart from using load resistors or going back to incandescent?
     
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  2. SpeedyGee Administrator Staff Team

    England Speedy Birmingham
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    Sorry I'm not sure I fully understand the problem.

    You say :-
    Cruise control should cancel if the brake pedal is touched.
     
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  3. speeding_ant Club Member ★ ☆ ☆ ☆ ☆

    NZ
    71
    26
    Sorry, yes I understand that the cruise control should cancel using the brake lights. What I'm saying is that after I installed LED brake bulbs, only after I turn the lights on, the cruise control doesn't work at all.

    With the lights on I am guessing that the LED bulbs use a lot less current, and perhaps the cruise control computer thinks the brake lights are out. I'm more intrigued as to why that should even make a difference.
    - - - Updated - - -
    Before LED brake lights:

    Lights off: cruise control works as expected, and brakes cancel as expected
    Lights on: cruise control works as expected, and brakes cancel as expected

    After LED brake lights:


    Lights off: cruise control works as expected, and brakes cancel as expected
    Lights on: cruise control doesn't set speed, so it never works
     
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  4. SpeedyGee Administrator Staff Team

    England Speedy Birmingham
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    Pass :Unknown:
     
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