Interior Lighting System: Overview — Ford Focus II рестайлинг (2007-2011)

Note. The smart junction box (SJB) is also known as the generic electronic module (GEM).

The interior lighting system consists of the following components

SJB
Instrument panel dimmer switch
Interior/map lamps
Door ajar switches
Luggage compartment lamp
Luggage compartment lid latch
Ambient lighting module (if equipped)
Ambient lighting switch (if equipped) (part of the passenger air bag deactivation [PAD] indicator)
Ambient lighting lamps (if equipped)

The interior lighting system may consist of up to 3 subsystems

Courtesy lamps
Demand lamps
Ambient lighting (if equipped)

The courtesy lamps are controlled by the SJB. The courtesy lamp subsystem consists of the interior/map lamps. The SJB turns on the courtesy lamps when a door is opened. The courtesy lamps also turn on when an unlock signal is received from the remote keyless entry (RKE) transmitter.

The demand lamps system consists of the front dome map lamps. The SJB controls the demand lamps by providing ground for the battery saver relay.

The ambient lighting system consists of the ambient lighting switch, the ambient lighting module, and the harness with hard-wired LEDs all located within the floor console. The ambient lighting is turned on by the headlamp switch. Whenever the parking lamps are on (early build vehicles), or the ignition key is in the ACCESSORY or RUN position (late build vehicles) power is supplied to the ambient lighting module. The ambient lighting switch is used to cycle the LEDs through 7 different color combinations or to turn the ambient lighting off. The ambient lighting module provides the necessary voltage to the LEDs to illuminate the cup holders (front and rear) and the front and rear footwell areas.

SPECIAL TOOLS Illustration Tool Name Tool Number Vehicle Communication Module (VCM) and Integrated Diagnostic System (IDS) software with appropriate hardware, or equivalent scan tool 73III Automotive Meter 105-R0057 or equivalent Flex Probe Kit 105-R025C or equivalent

Scheme 1

Scheme 1: Interior Lighting

Scheme 2

Principles of Operation

Note. The smart junction box (SJB) is also known as the generic electronic module (GEM).

The SJB supplies voltage to the interior lighting system. The interior lighting system illuminates the courtesy lamps to enhance visibility of the interior while a vehicle door is ajar, and the vehicle speed is less than 15 km/h (9 mph). The SJB controls all interior lighting functions and timing by monitoring inputs from the door ajar switches, the instrument panel dimmer switch, and the vehicle speed.

Normal Operation

Voltage is supplied to the courtesy lamps by the smart junction box (SJB) fuse 9 (15A). When the SJB receives a request for the courtesy lamps the SJB energizes the solid-state relay supplying voltage to the courtesy lamps on circuit VLN33 (GY/VT). Ground for the courtesy lamps is supplied through circuit GD133 (BK).

DTC B2A35 (Interior Lighting Output Circuit Open) - is an on-demand DTC that sets when the SJB detects an open from the interior lighting circuit.
DTC B2A36 (Interior Lighting Output Circuit Short to Ground) - is a continuous and on-demand DTC that sets when the SJB detects a short to ground from the interior lighting circuit.