Possible Causes
WARNING: This page is about a different car, the 2003 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
BTSI OUTPUT CIRCUIT SHORT TO GROUND
BTSI OUTPUT CIRCUIT OPEN
BRAKE SENSE CIRCUIT OPEN
BRAKE LAMP SWITCH GROUND CIRCUIT OPEN
BTSI SOLENOID OPEN
BTSI SOLENOID SHORTED
BRAKE LAMP SWITCH
INSTRUMENT CLUSTER