PARK BRAKE SWITCH
DESCRIPTION
The park brake switch (1) is located on the park brake lever mechanism on the floor panel transmission tunnel below the center floor console. This switch includes a spade-type output terminal (3) that connects the switch to the vehicle electrical system through a dedicated take out and connector of the instrument panel wire harness. The output terminal is integral to the stationary contact within a molded plastic insulator.
A locating tab on the insulator engages a slot in the park brake lever mechanism for positive switch location. External to the insulator is a movable leaf contact with an integral grounding lug (2) on one end and an integral actuating lever and follower (4) on the opposite end. The switch is secured to and grounded by a single screw to the park brake lever mechanism.
The park brake switch cannot be adjusted or repaired and, if ineffective or damaged, it must be replaced.
OPERATION
The park brake switch is a normally closed, mechanically actuated leaf contact switch that is operated by the park brake lever mechanism. The switch is grounded through its mounting to the park brake lever mechanism and provides a ground input to the ElectroMechanical Instrument Cluster (EMIC) (also known as the Cab Compartment Node/CCN) on a park brake switch sense circuit whenever the park brake is applied, and opens this circuit whenever the park brake is released. The park brake switch sense input to the EMIC is used for control of the brake indicator and may also be used as a logic input for other electronic features in the vehicle.
The park brake switch as well as the hard wired inputs and outputs of the switch may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information.
REMOVAL
WARNING: To avoid personal injury or death, on vehicles equipped with airbags, disable the supplemental restraint system before attempting any steering wheel, steering column, airbag, seat belt tensioner, impact sensor, or instrument panel component diagnosis or service. Disconnect and isolate the battery negative (ground) cable, then wait two minutes for the system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the supplemental restraint system. Failure to take the proper precautions could result in accidental airbag deployment.
1. Disconnect and isolate the battery negative cable.
2. Remove the console from the floor panel transmission tunnel. (Refer to 23 - BODY/INTERIOR/FLOOR CONSOLE - REMOVAL).
3. Pull the parking brake lever (1) upward to apply the parking brake.
4. Disconnect the instrument panel wire harness connector from the terminal (4) of the park brake switch (2) located on the inboard side of the park brake lever mechanism.
5. Remove the screw (3) that secures the switch to the park brake lever bracket.
6. Remove the switch from the park brake lever bracket.
INSTALLATION
WARNING: To avoid personal injury or death, on vehicles equipped with airbags, disable the supplemental restraint system before attempting any steering wheel, steering column, airbag, seat belt tensioner, impact sensor, or instrument panel component diagnosis or service. Disconnect and isolate the battery negative (ground) cable, then wait two minutes for the system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the supplemental restraint system. Failure to take the proper precautions could result in accidental airbag deployment.
1. Position park brake switch (2) onto the inboard side of the park brake lever (1) bracket. Be certain to engage the locating pin on the back of the switch insulator into the locating slot in the lever bracket.
2. Install and tighten the screw (3) that secures the switch to the lever bracket. Tighten the screw to 3 N·m (24 in. lbs.).
3. Reconnect the instrument panel wire harness connector to the terminal (4) of the switch.
4. Reinstall the console onto the floor panel transmission tunnel. (Refer to 23 - BODY/INTERIOR/FLOOR CONSOLE - INSTALLATION).
5. Reconnect the battery negative cable.
6. Turn the ignition switch to the ON position and check for proper brake indicator operation with the parking brake applied, then release the parking brake and check that the brake indicator extinguishes.