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Originally posted by Top355x:
Denis if it activated by the trans brake button could the separate back up button be causing the issue

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Originally posted by markemark:
Like I wrote prior, the only inputs that activate the SLE are the Tap and TB buttons to Mega 475/450. The OP wrote that the Tap button and cable were changed.

Here’s a simple way to determine if the TB button is at fault activating the SLE. Leave the Mega programmed as is and remove the Tap button wire going to the Mega Terminal. Now the only thing that can trigger SLE is TB button input.

See if this continues to randomly activate using in this manner. If it continues to randomly activate it would point to the TB input. If the false activation stops, it points to the Tap button.

If you had a faulty SLE solenoid, it would not cycle on/ off on its own. The solenoid would do nothing when +12v was applied if solenoid bad. The only thing energizing that solenoid is the +12v coming from the SFO terminal of Mega.

You can also enable the SLE Starting Line Mode which will not require a Tap input or move the pedal to the floor

S.L.E. Starting Line Mode
The Starting Line Mode only affects the S.L.E. in Bracket Mode. When turned on and in any P.B. Mode except 5, the S.L.E. will activate with the Transbrake solenoid or the Tap Down button. This feature is used when the driver wants to stage the vehicle without having the gas pedal on the floor. Or if a Tap Down button has not been installed in the vehicle. With the S.L.E. line selected, use the ^ or v key to turn the starting line mode on or off. When turned on an “L” will be displayed just before the S.L.E. time.

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If the TB button is the cause the brake would set every time it acted up wouldn't it ?