This is a quick diagnostic video on how to figure out why your locks will not work in your Mercedes-Benz S-Class .
PSE (Pneumatic Systems Equipment) or Central locking issues.

All Mercedes-Benz used a PSE or form of PSE up until about 2006 in most models.
But every model has used a PSE since the 80's.
The most common cars to have them fail are the
W210
W215
W220
W140
R230
W202
W208
so the diagnoses process will be the same the only difference is the location of the PSE and the fuses.

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