Parking Brake Warning Lamp: Testing and Inspection

BRAKE INDICATOR

WARNING: To avoid serious or fatal injury on vehicles equipped with airbags, disable the Supplemental Restraint System (SRS) before attempting any steering wheel, steering column, airbag, seat belt tensioner, impact sensor or instrument panel component diagnosis or service. Disconnect and isolate the negative battery (ground) cable. Wait two minutes for the system capacitor to discharge before performing further diagnosis or service. On vehicles equipped with the optional Hybrid Electric Vehicle (HEV) system, a technician trained in proper HEV service safety procedures must also remove the high voltage service disconnect from the high voltage battery pack. This is the only sure way to disable the SRS. Failure to take the proper precautions could result in accidental airbag deployment. Failure to follow these instructions may result in possible serious or fatal injury.

The hardwired park brake switch input to the instrument cluster, also known as the Cab Compartment Node, (CCN) may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire harness and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds.

However, conventional diagnostic methods may not prove conclusive in the diagnosis of the CCN, the Controller Antilock Brake (CAB), the Controller Area Network (CAN) data bus or the electronic message inputs also used by the CCN to provide brake indicator operation. The most reliable, efficient and accurate means to diagnose the CCN, the CAB, the CAN data bus or the electronic communication related to brake indicator operation, requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.