My ABS brake light is staying on, Need help figuring it out....1999 4x4 cummins, 160k miles. RWAL (rear wheel anti lock)

 

I read up in my Repair manual. CAB(controler antilock breakes),, RWAL,,, Reat axle speed sensor

 

Brakes work great, pretty fresh pads front and rear, fluid level good

 

I fiddled with the plugs on the rear axle speed sensor, CAB , etc. Everything looks good.  Its a Clean truck, western desert area no rust

 

Is there any way to clear the memory in the RWAL C.A.B.

 

Any ideas what the problem is that keeps the ABS light on in the dash.

 

 

PS my '99 only has rear ABS , No front

Edited April 24, 20169 yr by GSP7

5 hours ago, GSP7 said:

Is there any way to clear the memory in the RWAL C.A.B.

 

Fix the problem and drive the truck. If the problem is truly fixed then the light self reset. As for clearing the memory it can't be done unless you have a DRBIII tool like the dealer got. Still in all that will not resolve the light issue it will come back on till you repair the issue. There are dump valve solenoids and a controller. You can send that controller to Module Masters and have it rebuilt or at least read for codes.

Well, what is the "repair fix" for the ABS light being on ? Doesnt say in the good repair manual

 

My speedo works fine.

 

I also read that other post about ABS light on and speedo not working

 

Mine is a '99

If you can get thee codes read at the dealer then we'll know what to do.

Have you tried to read the codes? There is more than one reason for the ABS light to be on.

I have a code reader and just ran a code read again tonight, and its clear no codes

 

Check engine light had not gone on either

The codes you are looking for will be in the PCM. 

No codes, code check clear,  just the 'ABS' light and 'Brake' lights on dash are on

Edited April 25, 20169 yr by GSP7

What brand/model of code reader do you have? Does it allow you to choose between the PCM or the ECM? 

Edited April 25, 20169 yr by 903Dodge

He need a ABS and SRS code reader. Not a OBDII reader. Like I've got one but it doesn't work on 1998 to 2002 Dodge Rams...

 

http://pro.innova.com/Product/FullDetail/f968c286-07ab-46b7-bfd5-bae40673742e

 

The only thing I know that will read the ABS/SRS codes is a DRBII dealer tool.

 

I very recently had my ABS, brake, and airbag light on with no codes and every thing worked fine. I had also noticed some stiffness in the ignition switch. Not every time but maybe 1 out 10 times. It turns out the switch was not returning completely to the run position after starting. My key was the one i had been using since the truck was new. On the times the lights stayed lit I had to turn the switch back to the run position and they would go out. I broke the other new key and started using it and it has not happened since. Might not be your issue just a personal experience for me.

 

If a code has been set int he ABS module a regular code reader want do it. Like Mike says you will have to go to a dealer to get them read, though it is possible a shop would have one, but I would think they would be few and far between.

Do you have a mechanic friend? Need the $10,000 snap on code reader for this one, or the dealer and pay $80-$100.

Do you have a mechanic friend? Need the $10,000 snap on code reader for this one.

This is not true, go get yourself a AutoEnginuity code reader.

My two cents (2¢)

I've even got a Innova 31603 code reader that does both ABS/SRS codes but our generation of truck it misses. 1998 to 2002 it doesn't work. 1996 to 1997 it does and 2003 and up it works.

I know that mopar1973man i've seen you on cummins forums.

I'm not saying it's going to be cheap but at least it will bring you in the 500$ ball park.

Guess I'll just have to take some pictures tomorrow.

As promised picture show time.

Since my truck has no ABS issue i disconnected the right front wheel abs sensor.

Now the ABS brake light is on.

Pic. 3

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Pic. 6
Pressed current.

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Pic. 9
Here i connected the abs sensor back and run the code clearing.

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Pic. 11

Nice ^^^ 

I had my truck on 2x high end units worth many times that and neither could read .

 

Most likely the rear sensor ...... since rwal  abs 

But don't remember that tripping the brake light .......

 

You can try ohm out the sensor as well as the wires. 

Excellent scan tool for the money with OEM-specific coverage.

AutoEnginuity also has live graphing and lots of other capabilities I never tried.

Little secret if you resolve the light issue and roll forward even 20-40 feet the light will go out on their own. The codes will remain. So in your case you've not resolve the code so now when you start rolling again the light will pop back on soon.

 

Currently mine are still on but I know the tone ring in both hubs are the issue but I got bigger fish to fry like reinstalling a transmission.

 

How are you talking with the OBDII port with what device.

Edited May 3, 20168 yr by Mopar1973Man

Quote

You can try ohm out the sensor as well as the wires. 
 

Best way:

Checked for an Ohm resistance reading at the ABS connector [pin 1 and pin 8, see pic.]
Rear sensors should be around 1600-2300 ohms.

 

Quote

How are you talking with the OBDII port with what device.

PC-based ScanTool (needs pc with windows MS xp and up) $249.95
#ST06 - USB (ST06 ProLine VCI)

+ Enhanced PC Chrysler and Dodge-family (Full) Expansion $229.95

Edited May 3, 20168 yr by Chris O.

Here we are back to nearly $500 for a tool again...