Grand Cherokee 2WD Limited V8-4.7L (2002)
Brake Fluid Level Sensor/Switch: Description and Operation
BRAKE WARNING INDICATOR SWITCH
The brake warning indicator switch is a fluid level sending switch. The CAB sends out a voltage divider 12 volt signal to the switch. The switch has a
1,000 ohm resistor inside of it. This resistor is used for diagnostic purposes. Normal voltage is about 2.3 volts. If the switch is disconnected the
resistor will be pulled out of the circuit and the CAB will sense voltage over 4 volts. If the fluid level becomes too low or the circuit is shorted to
ground, the voltage will be below 1 volt. Any fault condition will illuminate the red brake warning indicator and the specific fault can be read on the
DRB III.
