1990 Chevrolet 1500 Pickup Q&A
1990 Chevrolet 1500 Pickup Question: Light Flashing On dash
The red light flashing is probably the "brake" light on your 1990 Chevrolet 1500 Pickup. The code 4 would indicate a fault with the RWAL valve switch. The ABS control module is seeing the RWAL valve switch closed or grounded when it should not be. Sorry I do not have a diagnostic chart available for the RWAL valve switch. - Oakman
Why is my 4wd indicator lights flashing and how do you reset the tccm module?
as the warning lights come on the tach, speedometer,and guages go down to the bottom. they go to normal quickly. truck keeps running normally. sometimes they flash alot sometimes not at all