Wrangler 2WD V6-3.8L (2008)
Brake Warning Indicator: 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 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 SRS. Failure to take the proper precautions could result in accidental
airbag deployment.
The hard wired park brake switch input to the ElectroMechanical Instrument Cluster (EMIC) (also known as the Cab Compartment Node/CCN) may be
diagnosed using conventional diagnostic tools and procedures. The wiring information includes wiring diagrams, proper wire 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 EMIC, the Controller Antilock Brake (CAB), the Totally
Integrated Power Module (TIPM), the Controller Area Network (CAN) data bus, or the electronic message inputs also used by the EMIC to provide
brake indicator operation. The most reliable, efficient, and accurate means to diagnose the EMIC, the CAB, the TIPM, the CAN data bus or the
electronic communication related to brake indicator operation requires the use of a diagnostic scan tool.
