1990 GMC V1500 Jimmy Flashing Brake Lights

1990 GMC V1500 Jimmy 350CUI TBI TH700R4 NP241 10B front/rear 3.73 front/rear ABS rear - in working condition (maybe, was until the following incident but haven't tested it since so it may still be working who
knows....)
After an extremely forceful application of the brakes at about 55MPH that locked up the fronts and I'm sure started to utilize the ABS in the rears, my brake light has been on steady for about 1 week. Just after the incident I stopped and tried removing the 1 wire that goes to the proportioning valve, and this does NOT turn off the light so I don't/didn't think it was a pressure thing. I thought my parking brake switch was out of alignment (lifting up on lever doesn't fix it) and just kept on driving it. I haven't checked the p-brake switch though.
This morning it started tweekin out, thought maybe it would go out (flashing on and off randomly) Then it got rythmic; 7 short 1 long 7 short 1 long etc.
Turn off the truck, and put the key in "run" and it does the same thing. NOTHING has been jumpered AFAIK, so I don't have the truck in diagnostic mode - unles it shorted somewhere in the loom.
Everything seems fine in operation?? I'm in work right now so I can't consult my repair manuals.
GMC Gremlin
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
P.S. I mean the warning
BRAKE ( P ) ( ! )
light, not the brake lights you would see outside of the car. JJJJJJJJJJJJJJJJJJJJJJJEST to make sure. The subject I chose sucks!
GMC Gremlin
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
GMC Gremlin wrote:

Unplug the connectors to the RWAL module that sits right beside/under the master cylinder. Plug them back in after about 30 seconds...see if the light goes out. These were famous for setting false codes. If the light comes right back on, probably pretty sure that you have an actual problem.
Ian
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
So the computer by the MC, that has a bunch of wires, right? NOT the proportioning valve with 1 wire.
GMC Gremlin

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
GMC Gremlin wrote:

Yes, there should be two connectors at the module.
Ian
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
How do they come off? They both are blue and white. It looks like the white pin is a "safety" that needs to be removed before the connector can come off? Just don't want to break it since the white bit wasn't coming off too easily.
GMC Gremlin

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Related Threads

    Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.