If you are asking about the 4matic trouble light it is on steady all the time, driving or not. There was a slight pulsing but that stopped when I fixed the ground wire at the tailgate hinge in order to get the the Third brake light to work. The third brake light now works fine and the lamp trouble light is no longer lit
. The square "active" light in the middle of the dash has never come on.
What and where is the pressure transducer you are asking about?
Brake lights work fine so I have not messed with the switch. I did replace the headlight switch for cause but don't remember the symptoms.
No ABS trouble light so I have not done any thing to that system. I don't know if it actually works as I haven't felt it in the brake pedal or had the indicator light come on while hard braking. Brakes feel solid although nothing like current "modern" ones that throw you through the windshield.
The ground issue I have been chasing seems to involve the central locking, power antennae, and tailgate window washer pump circuits. I dug deep into the center console, under passenger carpet for locking air pump and couldn't find a bad ground. I know about the red fuse behind the instrument display (if i even have one) but as I can't see it without taking out the cluster I pass on that fix. I am afraid doing so will cause more issues than it would fix
. The lights in the instrument cluster work as does the dimmer for these lights.
Thanks for you continued interest,