"Brake" light flashing???
#1
07-22-2010, 09:48 PM
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"Brake" light flashing???
Hey all, looking for some help here.
What is happening is when the truck is put into drive, the park light on the dash continually flashes and dings when stepping on the throttle.
Brake fluid level is good, e-brake is not on, truck is running well. I read that radio frequencies may affect the abs and these light are somewhat joined, not totally sure of this but just want to make sure it’s safe to drive and tow with?
Any help would be really appreciated as tomorrow morning I'm towing for a full day loaded.
What is happening is when the truck is put into drive, the park light on the dash continually flashes and dings when stepping on the throttle.
Brake fluid level is good, e-brake is not on, truck is running well. I read that radio frequencies may affect the abs and these light are somewhat joined, not totally sure of this but just want to make sure it’s safe to drive and tow with?
Any help would be really appreciated as tomorrow morning I'm towing for a full day loaded.
#2
08-09-2010, 04:40 AM
Sounds like it has RWAL
Is it the dash brake indicator light, which comes on when the park brake is applied, that is blinking?
RWAL stands for REAR WHEEL ANTILOCK. RWAL was standard equipment starting in 1988 on full size trucks.
The RWAL system can store trouble codes.
The RWAL system is only capable of storing one code at a time.
You can retrieve RWAL codes without a scan tool.
To retrieve RWAL codes connect a jumper wire between terminal H and terminal A of the ALDL connector with the key on (engine not running). Watch the dash brake lamp and count the blinks. Sometimes RWAL system send out a phantom blink before the code blinks start. It can take up to 20 seconds for the code to start coming out.
Checking the code with this method can set a false code 9.
You can clear the code by removing the fuse for 10 seconds then reinstalling it. The fuse should be labeled STOP/HAZARD or BRAKE. Removing the RWAL fuse will not clear the code.
If you get one long flash and 5 shorter flashes that is a code 6.
If the light is blinking the manual states you should still check the codes by turning the key on (engine not running) and put a jumper wire between terminal A and H of the ALDL. Count the brake light flashes.
On trucks built after Aug 1994 a scanner is required to retrieve codes 6,9,10
This site tells how to read your codes.
DIY Auto Repair Help - Car Maintenance, Troubleshooting, How To Tutorials...
This site has general information about RWAL.
http://www.babcox.com/editorial/tr/tr89850.htm
On this system it is usually best to: Check the code, clear the code, and drive the truck and see if the code returns.
Code 4 = Grounded or closed RWAL valve switch
Do you have a good digital ohm meter for testing?
Do you want test information?
For those of you that are wondering why you are not getting replies to your thread:
Did you give the model, year, engine, fuel system type, and transmission information?
Is it the dash brake indicator light, which comes on when the park brake is applied, that is blinking?
RWAL stands for REAR WHEEL ANTILOCK. RWAL was standard equipment starting in 1988 on full size trucks.
The RWAL system can store trouble codes.
The RWAL system is only capable of storing one code at a time.
You can retrieve RWAL codes without a scan tool.
To retrieve RWAL codes connect a jumper wire between terminal H and terminal A of the ALDL connector with the key on (engine not running). Watch the dash brake lamp and count the blinks. Sometimes RWAL system send out a phantom blink before the code blinks start. It can take up to 20 seconds for the code to start coming out.
Checking the code with this method can set a false code 9.
You can clear the code by removing the fuse for 10 seconds then reinstalling it. The fuse should be labeled STOP/HAZARD or BRAKE. Removing the RWAL fuse will not clear the code.
If you get one long flash and 5 shorter flashes that is a code 6.
If the light is blinking the manual states you should still check the codes by turning the key on (engine not running) and put a jumper wire between terminal A and H of the ALDL. Count the brake light flashes.
On trucks built after Aug 1994 a scanner is required to retrieve codes 6,9,10
This site tells how to read your codes.
DIY Auto Repair Help - Car Maintenance, Troubleshooting, How To Tutorials...
This site has general information about RWAL.
http://www.babcox.com/editorial/tr/tr89850.htm
On this system it is usually best to: Check the code, clear the code, and drive the truck and see if the code returns.
Code 4 = Grounded or closed RWAL valve switch
Do you have a good digital ohm meter for testing?
Do you want test information?
For those of you that are wondering why you are not getting replies to your thread:
Did you give the model, year, engine, fuel system type, and transmission information?
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