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It stops the rear electric windows from being opened (child safety device). When activated the button lights up orange.
Mine (A 306 XtDT is still going at 198,000). Just keep the oil changes regular. I suggest an air filter change, oil filter and oil change every 10K and this should keep your pug running sweet. Mine is a 1995 turbo diesel old chugger but it still pulls away quicker than a boy at bah-mitzfah. Cheers Keithdingle