Lighting Systems - Interior: Overview Jeep Liberty I

DESCRIPTION

The interior lighting system for this model includes the following incandescent interior lamps

1. Ash Receiver Lamp - An available ash receiver lamp is located above the ash receiver housing behind the instrument panel center bezel, and is controlled by the panel lamps dimmer circuit.
2. Cargo Lamp - An available cargo lamp with an integral lens-actuated courtesy disable switch is located in the headliner near the rear roof header, and is controlled by the courtesy lamp circuit.
3. Courtesy Lamps - Available courtesy lamps are located below both the right and left side of the instrument panel, and are controlled by the courtesy lamp circuit
4. Compass Mini-Trip Control Illumination Lamps - The optional Compass Mini-Trip Computer (CMTC) has three replaceable control illumination bulb/bulb holder units on its circuit board that are controlled by the panel lamps dimmer circuit.
5. Dome Lamp - A standard front dome lamp that does not include an on-off switch is located in the headliner near the windshield header, and is controlled by the courtesy lamp circuit.
6. Hazard Switch Illumination/Indicator Lamp - The hazard switch control button has a non-replaceable illumination/indicator bulb soldered onto its circuit board that is controlled by both the hazard switch circuitry and the panel lamps dimmer circuit. See «HAZARD SWITCH»(ref-175772-S23614202852005042800000) in EXTERIOR LIGHTS article.
7. Heater-Air Conditioner Control Illumination Lamps - The heater-air conditioner control has two replaceable control illumination bulb/bulb holder units on its circuit board that are controlled by the panel lamps dimmer circuit.
8. Instrument Cluster Illumination Lamps - The ElectroMechanical Instrument Cluster (EMIC) has nine replaceable general illumination bulb/bulb holder units on its circuit board that are controlled by the panel lamps dimmer circuit.
9. Reading Lamps - Available front seat driver side and passenger side reading lamps located in the headliner near the windshield header are controlled by both the courtesy lamp circuit and independent lens-actuated switches.
10. Transmission Range Indicator Illumination Lamp - Vehicles equipped with an automatic transmission have an illuminated transmission range indicator integral to the console mounted gearshift mechanism, and controlled by the panel lamps dimmer circuit.
11. Vanity Lamps - Available single intensity vanity lamps are located on each side of covered mirror on both the right and left sun visors, and are controlled by an integral vanity mirror cover-actuated switch on the courtesy lamp circuit.

Scheme 1

Other components of the interior lighting system for this model include

1. Body Control Module - The Body Control Module (BCM) is located on the Junction Block (JB) under the driver side outboard end of the instrument panel.
2. Door Ajar Switches - A door ajar switch is integral to the door latch mechanism of each front and rear door.
3. Flip-Up Glass Ajar Switch - A flip-up glass ajar switch is integral to the flip-up glass latch mechanism on the top of the tailgate inner panel.
4. Multi-Function Switch - The multi-function switch is located on the top of the steering column, just below the steering wheel. The multi-function switch includes a left and right control stalk. The left control stalk is dedicated to providing almost all of the driver controls for both the exterior and interior lighting systems.
5. Tailgate Ajar Switch A tailgate ajar switch is integral to the latch mechanism of the tailgate.

OPERATION

The interior lighting systems can be divided into two general classifications based upon the circuit that controls their operation: The courtesy lamp circuit, or the panel lamps dimmer circuit. The hard wired circuits and components of the interior lighting systems may be diagnosed and tested using conventional diagnostic tools and procedures. However, conventional diagnostic methods may not prove conclusive in the diagnosis of the Body Control Module (BCM), the ElectroMechanical Instruments Cluster (EMIC), or the Programmable Communications Interface (PCI) data bus network. The most reliable, efficient, and accurate means to diagnose the BCM, the EMIC and the PCI data bus inputs and outputs related to the various interior lighting systems requires the use of a DRBIII(R) scan tool. Refer to the appropriate diagnostic information.

This vehicle has four door ajar switches, one for each door. Each switch is concealed within and integral to its respective door latch unit. The switches are momentary leaf contact-type units that are actuated by the door latch mechanisms. A short pigtail wire and connector on each door latch connects the door ajar switch to the vehicle electrical system through its respective door wire harness. The door ajar switches cannot be adjusted or repaired and, if faulty or damaged, the door latch unit must be replaced. See FRONT DOOR LATCH .

The door ajar switches are actuated by the door latch mechanisms. When a door is closed and properly latched, its door ajar switch is an open circuit. When a door is open or only partially latched, the door ajar switch is a closed circuit. The door ajar switches are hard wired between a body ground and the Body Control Module (BCM). The driver side front door ajar switch is connected to the BCM through a driver door ajar switch sense circuit, while the remaining three door ajar switches are connected to the BCM through a passenger door ajar switch sense circuit in a parallel-series arrangement. The BCM reads the door ajar switch status through an internal pull-up, then uses these inputs to control many electronic functions and features of the vehicle. The door ajar switches can be diagnosed using conventional diagnostic tools and methods; however, for proper diagnosis of the BCM, and both the hard wired and electronic BCM outputs affected by the door ajar switch inputs, a DRBIII(R) scan tool is required. Refer to the appropriate diagnostic information.

A flip-up glass ajar switch is standard equipment in this vehicle. This switch is concealed within and integral to the flip-up glass latch. The switch is a momentary leaf contact-type unit that is actuated by the flip-up glass latch mechanism. A dedicated connector on the flip-up glass latch connects the flip-up glass ajar switch to the vehicle electrical system through the tailgate wire harness. The flip-up glass ajar switch cannot be adjusted or repaired and, if faulty or damaged, must be replaced. See SWING GATE FLIP-UP GLASS LATCH .

The flip-up glass ajar switch is actuated by the flip-up glass latch mechanism. When the flip-up glass is closed and properly latched, the flip-up glass ajar switch is an open circuit. When the flip-up glass is open or only partially latched, the flip-up glass ajar switch is a closed circuit. The flip-up glass ajar switch is hard wired between a body ground, the Body Control Module (BCM), and the rear wiper motor. The output of the switch is connected to the BCM and rear wiper motor through a flip-up glass ajar switch sense circuit. The BCM reads the flip-up glass ajar switch status through an internal pull-up, then uses this input to control many electronic functions and features of the vehicle. The rear wiper motor uses this input to restrict rear wiper operation when the flip-up glass is ajar. The flip-up glass ajar switch can be diagnosed using conventional diagnostic tools and methods; however, for proper diagnosis of the BCM, and both the hard wired and electronic BCM outputs affected by the flip-up glass ajar switch input, a DRBIII(R) scan tool is required. Refer to the appropriate diagnostic information.

A tailgate ajar switch is standard equipment in this vehicle. This switch is concealed within the tailgate latch. The switch is a momentary leaf contact-type that is actuated by the tailgate latch mechanism. A pigtail wire harness and connector on the tailgate latch connects the tailgate ajar switch to the vehicle electrical system. The tailgate ajar switch cannot be adjusted or repaired and, if faulty or damaged, must be replaced. See SWING GATE FLIP-UP GLASS LATCH .

The tailgate switch is actuated by the tailgate latch mechanism. When the tailgate is closed the tailgate ajar switch is an open circuit. When the tailgate is open or only partially latched, the tailgate ajar switch is a closed circuit. The tailgate ajar switch is hard wired between a body ground and the Body Control Module (BCM). The output of the switch is connected to the BCM through a tailgate ajar switch sense circuit. The BCM reads the tailgate ajar switch status through an internal pull-up, then uses this input to control many electronic functions and features of the vehicle. The tailgate ajar switch can be diagnosed using conventional diagnostic tools and methods; however, for proper diagnosis of the BCM, and both the hard wired and electronic BCM outputs affected by the tailgate ajar switch input, a DRBIII(R) scan tool is required.