Jeep Workshop Manuals
Grand Cherokee 2WD V6-3.7L (2008)
Sensors and Switches > Sensors and Switches - Lighting and Horns > Brake Light Switch > Component Information > Description and Operation > Stop Lamp Switch > Page 1208
Brake Light Switch: Description and Operation
Vehicles equipped with an optional Electronic Stability Program (ESP)/Traction Control System (TCS) package have a stop lamp inhibit relay. The stop
The stop lamp inhibit relay is located in the Junction Block (JB) in the passenger compartment under the driver side end of the instrument panel.
The stop lamp inhibit relay cannot be adjusted or repaired and, if ineffective or damaged, the unit must be replaced.
The stop lamp inhibit relay is an electromechanical switch that uses a low current input from the Controller Antilock Brake (CAB) to interrupt a high
The movable common supply contact point is held against the fixed normally closed contact point by spring pressure. When the relay coil is energized,
The inputs and outputs of the stop lamp inhibit relay include:
Common Supply Terminal (30) - The common feed terminal is connected to the output of the brake lamp switch at all times.
Coil Ground Terminal (85) - The coil ground terminal is connected to a control output of the CAB through a stop lamp inhibit relay control
Coil Battery Terminal (86) - The coil battery terminal is connected to a fused ignition switch output (run-start) circuit at all times.
Normally Open Terminal (87) - The normally open terminal is not connected to any circuit in this application, but will have battery voltage
Normally Closed Terminal (87A) - The normally closed terminal is connected to the brake lamps through a brake lamp switch output circuit and
The stop lamp inhibit relay as well as the hard wired inputs and outputs of the relay may be diagnosed using conventional diagnostic tools and
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