Brake Lamp Switch

Symptom:
* BRAKE LAMP SWITCH

POSSIBLE CAUSES
BRAKE SWITCH (SENSE CIRCUIT)
BRAKE SWITCH GROUND CIRCUIT OPEN
DRB DOES NOT SHOW BRAKE SW PRESSED OR RELEASED
BRAKE SWITCH GROUND CIRCUIT OPEN
BRAKE SWITCH SENSE CIRCUIT OPEN
CAB DEFECTIVE - BRAKE LAMP SWITCH SENSE
BRAKE SWITCH (SENSE CIRCUIT)
BRAKE LAMP SWITCH SENSE CIRCUIT SHORT TO GROUND