Red Light On, Yellow Light Off & Does Self-Check
- Turn ignition on. Release parking brake pedal. If Red light goes off, road test vehicle. With vehicle stopped, apply and release parking brake a few times.
- If Red light comes on during road test or light never went out, unplug parking brake switch connector. If Red light goes out, adjust or replace parking brake switch. It Red light remains on, unplug vacuum switch (diesel engines). If light goes off, repair vacuum pump. On all engines, if light remains out unplug control module connector.
- If Red light goes off, replace control module. If Red light remains on, check for shorted wiring between Red light and diode/resistor. Diode/resistor is located in wiring harness on left front fender on Bronco II and Ranger. On Bronco and F Series, diode resistor is located behind instrument panel.