Component Description

Brake Fluid Level Switch 

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

Park Position Detect Switch 

The park position detect switch is hardwired to the IPC through a single signal circuit and is grounded by a separate circuit through the selector lever. The IPC provides a reference voltage to the park position detect switch. When the selector lever is in PARK (P), the park position detect switch closes to ground, pulling the reference voltage low. When the selector lever is moved out of PARK (P), the park position detect switch opens to ground, sending the reference voltage high to the IPC.

Parking Brake Position Switch 

The parking brake position switch is hardwired to the BCM through a signal and return circuit. The BCM provides a reference voltage on the signal circuit. The return circuit is grounded internally in the BCM. 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.

Instrument Panel Cluster (IPC) 

The IPC provides the driver with a system status and alerts the driver when certain conditions exist in the vehicle. The IPC receives the ignition status from the BCM over the Medium Speed Controller Area Network (MS-CAN). The IPC requires Programmable Module Installation (PMI) when the IPC is replaced.