I have a 2000 S-TYPE 3.0L with both a DSC system fault/CATS system fault showing in the drivers information display the following codes are present in the system C1288, C1289 & C1515. The first two codes correspond to brake pressure switch malfunctions in the primary & secondary hydraulic circuits the last one refers to a faulty lateral accelerometer sensor. I checked my master cylinder revervoir and my fluid level is good. Also fluid looks clean no evidence of brake seal breakdown residue that could be causing the switches to get stuck. I looked at a wiring diagram for these sensors and all of the wires go directly to & from the DSC electronic control module am I correct in my assumption that the DSC electronic control module is faulty? Does anyone have any other diagnosis information to help me confirm my theory? I appreciate any replies or information provided.

 

You are in a very complicated area to repair with multiple things wrong. Unless you can get parts very cheap you are just throwing parts at it. This is one repair where taking it to the dealer might be best??
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Any chance you have a power problem? Most likely a failing battery, but could be bad connection for batt+ or - or any ground strap.

 

Both accelrometers are under the center console. 5v referance, ground and should be 2.5v at rest for signal wire
the brake pressure sensors also have ground, 5v ref. And 0-5v signal/pressure

 

Here are some of the specs from the brake pressure switches that I got this afternoon and all wiring appears to be good and have continuity. The YEL/BLK & YEL/PPL are my 5volt reference that tests good. The WHT/BLK & WHT/PPL are my signal wires they are at .2volts at rest and 2volts with the brake pedal fully depressed. The BRN/YEL and BRN/WHT seem to be my ground wires but I have .02volts on both of these wires at all times. If the module controls ground and step down voltage am I correct in my theory that this module is bad? Thanks