Hello, The rear headrests on my '94 e320 stopped falling when I pushed the button. So I popped up the rear seat and tested the vaccuum. The vaccuum checked good (when I bypassed the relay / switch the headrests fell). So I took off the electrical connection from the dash switch and decided to test the voltages on the pins to see if the dash switch or the relay was to blame. I measured all pins to chassis ground. I got 11.8 volts on the pin with the black / green wire. Every other pin measured 0 volts. Nothing happend when I pressed the dash switch. I'm guessing the dash switch is bad, but would like to remove it from the panel to test it individually before I spend money on a new one. What is the best way to remove this switch from the dashboard w/o damaging the dash? I'm guessing this is a PBNO type switch, am I correct? If someone could send me the proper voltages and normal switch operation information, I would be most appreciative. Thanks, Will

Try this,

While moving, accelerate a little, and while releasing the throttle, hold down on the switch. You might find they drop. If so maybe not enough vacumn is present

I doubt the switch is bad unless you have depressed it over 10,000 times.

__________________
Mike Mullins
03 911 Targa 35K
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17 Sienna (Grandkids mobile movie Theatre)
17 Toyota Tacoma DBL Cab (YardBoy)
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97 E320 Great chassis
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71 250C Restored MBCA Concours winner and Sold
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Hi Mike,

I tried that in an attempt to build up the vaccuum pressure, but still no go.

I'm convinced it's electrical / mechanical since when I connect the vaccuum lines directly (bypassing the relay valve) the headrests drop with no problem.

I don't have the manuals, so I can't tell what contacts of the relay need power to open the valve. If I knew that, I could test the electrics to tell if it is the switch or the valve. Also, if I could get the switch out, I could short the contacts manually to bypass the switch and see if the switch is at fault.

How do I safely get the switches out of the dashboard?

Thanks for the help.
Will