Caravan FWD V6-201 3.3L VIN R MFI (1997)
Brake Warning Indicator: Description and Operation
Brake Warning Lamp Circuit Operation
CIRCUIT OPERATION
The brake warning lamp is used to alert the operator that the brake system pressure has fallen below a pre-determined level. It is also used to
indicate when the parking brake is applied.
Power for the lamp is supplied on circuit V23. This circuit is HOT in the START and RUN position only, and protected by a 20 Amp fuse located
in cavity 3 of the junction block.
Circuit A21 connects from the ignition switch to the fuse to supply power.
Battery voltage for the A21 circuit is supplied on circuit A1. This circuit originates at the Power Distribution Center (PDC) and is protected by a
40 Amp fuse located in cavity 5.
Ground for the lamp is supplied either by the brake pressure switch or the park brake switch on circuit G9. The parking brake switch is normally
OPEN. When the switch is CLOSED the ground path is completed through the case grounded switch.
The brake pressure switch is normally OPEN. When the system pressure is below the pre-determined level the switch CLOSES completing a path
to ground.
