1982 240D ignition switch faliure?

After turning off the car and removing the key the radio remains on and the aux fuel boost pump wired to activate in the aux mode continues to pressurize the fuel system. Car has 232K and in the last 19 years of ownership I have not replaced the ignition switch.

Is my diagnosis accurate of a failed ignition switch in the acc. position?

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Body and Interior Specific Aid

Chassis Model Number

W123

Diagnosis is correct

That is definitely where you would want to start.

82 240D ignition switch follow up

The key and tumbler can also be problematic with the age and miles on the car. I occasionally have to wiggle the key to unlock the column and engage the starter

I realize access to the tumbler is from the steering column and the instrument panel needs to be removed to replace the switch but my inclination is to do both.

Warning: Could be a double problem

When the key is sticking it could certainly be a bad tumbler but from my experience it can also mean a bad lock mechanism. The lock begins to stick which forces wear on the key tumblers. Since the lock mechanism is expensive you can certainly replace the tumbler first to see if that alone solves the problem.

82 240D Ignition Switch Plan "B"

Kent,

A little challenging but replaced ignition switch today but same problem remains: radio on and electric fuel boost pump remains on with key removed.

Upon completing the ignition switch install, before re-installing the instrument panel I re-connected the battery and was pleased to see no power to the radio. I did not insert the key at this time.

It was after attempting to replace the tumbler that the initial symptoms returned. Got the guide pin to retract on the replacement tumbler but could not get the pin to retract on the old tumbler. Found the "indent" but the tool will not seat deep enough to retract the pin.

Your thoughts please

1982 240D further problems

Took your advise and replaced both the switch and the tumbler. All was fine for two months . Same symptoms returned today. I ordered the lock mechanism today. By process of elimination I think I have or will have replaced all of the components ?