Description

DESCRIPTION







The interior lighting system for this vehicle includes incandescent lighting on two separate circuits: the dome/courtesy lamp circuit and the panel lamps dimmer circuit. The lamps on the dome/courtesy circuit include:

- Cargo Lamps (7) - The standard equipment cargo lamps are integral to the Center High Mounted Stop Lamp (CHMSL) located on the roof rear header above the rear glass on the back of the cab. One cargo lamp bulb is behind a clear lens on each outboard side of the center red lens of the CHMSL. The cargo lamps are manually activated or deactivated by depressing the momentary cargo lamps push button of the headlamp switch on the instrument panel to illuminate the cargo area of the pick-up box.
- Center Dome/Reading Lamp (Mega Cab Only) (4) - Mega cab has a center dome/reading lamp that is centered in the headliner just rearward of the front seat back. The center dome/reading lamp includes two bulbs and is switched by the door ajar switches or the interior lighting thumbwheel of the headlamp switch, but also includes two integral push button actuated switches.
- Front Dome or Dome/Reading Lamp (Standard Cab Except Overhead Console) (6) - On standard cab the dome lamp is centered in the headliner near the back of the cab. The standard (base) dome lamp has a single bulb and is switched by the door ajar switches or the interior lighting thumbwheel of the headlamp switch. The optional dome/reading lamp is mounted in the same location but includes an integral switch that is actuated by depressing the lamp lens.
- Front Dome/Reading Lamps (Overhead Console) (5) - In vehicles equipped with an optional overhead console there are two dome/reading lamps that are integral to the overhead console, which is centered in the headliner near the windshield header. The overhead console lamps are switched by the door ajar switches or the interior lighting thumbwheel of the headlamp switch, but also have switches that are individually actuated by depressing their respective lamp lenses.
- Front Dome or Dome/Reading Lamp (Quad Cab/Mega Cab Except Overhead Console) (5) - On quad cab or mega cab the front dome lamp is centered in the headliner near the windshield header. The standard (base) dome lamp has a single bulb and is switched by the door ajar switches or the interior lighting thumbwheel of the headlamp switch. The optional dome/reading lamp is mounted in the same location but also includes an integral switch that is actuated by depressing the lamp lens.
- Glove Box Lamp (2) - An optional glove box lamp with an integral switch is located at the upper right corner of the instrument panel glove box opening and illuminates whenever the glove box is opened.
- Rear Dome or Dome/Reading Lamp (Quad Cab/Mega Cab Only) (6) - The rear dome lamp on quad cab and mega cab includes a single bulb and is switched by the door ajar switches or the interior lighting thumbwheel of the headlamp switch. This lamp is centered in the headliner near the back of the cab. The optional dome/reading lamp is mounted in the same location but includes an integral switch that is actuated by depressing the lamp lens.
- Vanity Lamps (3) - An optional single intensity vanity lamp is located on one side of a covered mirror on both the right and left sun visors, and is controlled by an integral vanity mirror cover-actuated switch.

Most controls on the instrument panel and elsewhere in the interior of the vehicle are illuminated by the panel lamps dimmer circuit for night visibility. Some have miniature incandescent bulbs or Light-Emitting Diode (LED) units that are soldered to internal circuit boards and are not serviceable. The replaceable incandescent bulbs or bulb/bulb holder units on the panel lamps dimmer circuits in this vehicle include:

- Center Bezel Lamp (1) - An optional center bezel lamp with a replaceable bulb is located on the underside of the instrument panel center bezel to illuminate the center console forward storage bin and cup holders.
- Compass Mini-Trip Control Illumination Lamps - The optional Compass Mini-Trip Computer (CMTC) has up to three replaceable bulb/bulb holder units to illuminate its controls.
- Electronic Vehicle Information Center Control Illumination Lamps - The optional Electronic Vehicle Information Center (EVIC) has up to four replaceable bulb/bulb holder units to illuminate its controls.
- Heater-Air Conditioner Control Illumination Lamps - The single zone heater-air conditioner control panel has up to three replaceable bulb/bulb holder units to illuminate its controls. The illumination provisions for the dual zone heater-air conditioner control panel are not serviceable.

Other components of the interior lighting system for this vehicle include:

- Door Ajar Switches - A door ajar switch is integral to the door latch mechanism of each front and rear door.
- Headlamp Switch - A headlamp switch is located on the left side of the instrument panel, below and outboard of the steering column. The headlamp switch includes a vertical thumbwheel for selecting the panel lamps dimming level and for interior lighting control. A PARADE position of the thumbwheel illuminates all Vacuum Fluorescent Display (VFD) units at full brightness for visibility when driving in daylight with the exterior lighting turned ON. There are also detent positions to turn ON all interior courtesy lighting, and a DEFEAT position that overrides door ajar switch control of interior lighting.

- Instrument Cluster - The ElectroMechanical Instrument Cluster (EMIC) is also known as the Cab Compartment Node (CCN) in this vehicle. The EMIC/CCN is located in the instrument panel above the steering column opening, directly in front of the driver.

Hard wired circuitry connects the interior lighting system components to the electrical system of the vehicle. These hard wired circuits are integral to several wire harnesses, which are routed throughout the vehicle and retained by many different methods. These circuits may be connected to each other, to the vehicle electrical system and to the interior lighting components through the use of a combination of soldered splices, splice block connectors, and many different types of wire harness terminal connectors and insulators. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, further details on wire harness routing and retention, as well as pin-out and location views for the various wire harness connectors, splices and grounds.