C0091

DTC C0091 Open Brake Switch Contacts during Deceleration






Circuit Description
This DTC is used to identify the conditions of brake switch circuit. The EBCM sends a low current 5 volt sense voltage on brake switch input line to the rear brake light bulbs. If the rear brake light circuit is intact, this voltage will be pulled low (under 1 volt) to ground through the rear brake light bulbs. When the brake light switch is depressed, battery voltage will be supplied to the rear brake lights and to the EBCM, indicating brake lights are on.

Conditions for Setting the DTC
^ Brake switch contacts open.
^ Brake switch fuse open.
^ Brake switch fuse power feed circuit open.
^ Brake switch misadjusted.
^ Internal EBCM fault.

Conditions for Clearing the DTC
^ If the conditions that the DTC C0091 no longer presents, the DTC can be cleared by scan tool.
^ The DTC that has not occurred in 100 drive cycles will be cleared from the history data.

Action Taken When the DTC Sets

Steps 1-10:

Step 11:

^ ABS remains functional.