Another Cab owner bought a new controller and it didn't solve his headrest problem. It's likely a tilt sensor as my PO said it would come up when he hit a bump. The bouncy ride indicates it needs new struts...

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'88 300TE, 175k, black RENNTech 3.6L Recaro C's AMG 1 SOLD
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'94 E320 Cabriolet, 110k, black, stock, SOLD
'88 300TE, 229k, dark grey, SOLD
'90 300CE, 212k, white, new paint, SOLD
'91 300E, 209k, white, rebuilt head SOLD
'74 914-6, grey, 2.7L 325hp twin turbo Audi conversion