Brake Warning Indicator

The IPC uses 3 inputs to control the brake warning indicator. The first 2 inputs are the parking brake position switch and the brake fluid level switch, which are hardwired to the IPC. The third input is the brake warning indicator request message sent from the ABS module over the HS-CAN.

The parking brake position switch and the brake fluid level switch are hardwired to the IPC through a single signal circuit while using a separate ground to control the input.

The IPC provides reference voltage to both the parking brake position switch and the brake fluid level switch.

When the ABS module detects a base brake system concern or other ABS-related concerns that affect the EBD function, the ABS module sends the brake warning indicator request to the IPC over the HS-CAN. The IPC illuminates the brake warning indicator when the brake warning indicator request is received.

Refer to DESCRIPTION AND OPERATION description for a summary of the conditions when the brake warning indicator is illuminated.