Component Description

Brake Fluid Level Switch 

The brake fluid level switch, mounted in the master cylinder reservoir, is hardwired to the IPC through a signal circuit and grounded through a separate body ground circuit. The IPC provides a reference voltage to the brake fluid level switch. When the brake fluid level is low, the float drops, allowing the switch to open, sending the reference voltage high. When the brake fluid level is high, the float lifts, closing the switch, providing a ground and pulling the reference voltage low on the signal circuit to the IPC.

Fuel Level Sender 

The fuel level sender is mounted to the fuel pump assembly. As the fuel level changes, the float rises or falls with the fuel level moving the sweep arm across the resistor wires. This movement either increases or decreases the resistance through the unit. The fuel level sensor resistance ranges between 180 ohms at empty (E) and 10 ohms at full (F). When the fuel level is low, the fuel level sensor resistance is high. When the fuel level is high, the fuel level resistance is low.

The fuel pump assembly is hardwired to the IPC through separate signal and return circuits. The fuel level return circuits are grounded internally in the IPC. The IPC provides a reference voltage on the fuel level signal circuit. As the fuel level changes, the change in resistance raises or lowers the fuel level signal voltage depending on the resistance of the fuel level sender.

IPC 

The IPC provides the driver with a system status and alerts the driver when certain conditions exist in the vehicle. The IPC controls the vehicle factory-transport mode and retains the central vehicle configuration. The IPC requires a Programmable Module Installation (PMI) when the IPC is replaced.

Parking Brake Position Switch 

The parking brake position switch is hardwired to the IPC through a signal circuit. The parking brake position switch is grounded externally through a separate circuit. The IPC provides a reference voltage on the signal circuit. When the parking brake is not applied, the parking brake position switch is open. When the parking brake is applied, the parking brake position switch closes, pulling the reference voltage low.

Safety Belt Buckle Sensor 

The safety belt buckles contain integrated sensors that are Hall-effect switches. The safety belt buckle sensors are serviced as one component with the safety belt buckle.