Bad ABS Module?

H

Henry

New member
I have a 2003 300a I've been chasing as abs light on. The code is for the right rear speed sensor circuit fault. After a lot of searching and investigating with a multimeter and have discovered that the abs module is not putting out the necessary 5 volts to the sensor to the right rear sensor (checked at the abs module plug). Has anybody else experienced something similar? I have a complete abs unit off another 300a on the shelf, just making sure that there isn't some other possible solution before i take the time to switch the pump out and bleed the brakes with the scan tool.
 
Can you just change the electronic control by itself instead of disconnecting the whole module? I have an 04 with TC and have the same issue. Mine has not been working for a few years now. So long that the TC and ABS light doesn't even go on anymore. Once in a while they will both illuminate but usually stay off. I too plan on swaping out the module but I may try to just change the electronics, not sure if that can easily be done though.
 
I have not checked voltage to the module yet as i do not have the wiring diagram and had to stop last night before i got that far. I will check that when i get home. I was also wondering if anybody has ever switched just the electronics. I believe i have a low mileage abs unit off a marquis I might sacrifice in order to figure out if its possible.
 
Henry said:
I have not checked voltage to the module yet as i do not have the wiring diagram and had to stop last night before i got that far. I will check that when i get home. I was also wondering if anybody has ever switched just the electronics. I believe i have a low mileage abs unit off a marquis I might sacrifice in order to figure out if its possible.
Click to expand...

They are different. The marauder abs unit is programmed for staggered sized tires
 
I checked voltage at the module key on, engine off. 11.6 volts. Battery is at 11.62. Guess I'm off to my storage building to grab a few modules and see what I can figure out.
 
You can swap only the electrical portion of the abs module without a problem. No brake bleeding required. You will run into an issue if you use a grand marquis module on your marauder unless you have the same size tire all the way around.

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I plugged in an extra module I had off a 300a. I now have power to the sensor. I'm gonna swap the electronics when I get a chance and it should be good to go.
 
Module master can rebuild your old unit fairly reasonable. And yes, the electronics can be changed out easily, you will possibly run into issues with the tire stagger.
 
I have my spare marauder one ready to put on. I will be sending the damaged module out to be repaired and it can sit on the shelf in case I ever need it.
 
Me too ---

I'm looking for a place that will repair my ABS unit -- same issues as others are having in this thread. Do you know who does this work?

Peter
 
I'm going to see if myairbags.com can repair it. They have abs module repair listed on their website for 100-150 depending on the type. I've used them for resetting air bag sensors several times. Very good customer service and quick turn around.
 
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