Interior Lighting System: Overview Ford Focus II

The system illuminates the interior lamp to improve visibility of the vehicle interior while a door is open.

The front interior lamp will be off, regardless of the state of the interior lighting feature, when the interior lamp switch is in the OFF position.

The front interior lamp will be on, regardless of the state of the interior lighting feature, when the interior lamp switch is in the ON position.

The front interior lamp will follow the status of the illuminated entry feature, when the interior lamp switch is in the illuminated entry position.

The front interior lamp illuminates when any of the following occurs

1. Any of the vehicle's doors are open (not including the tailgate or luggage compartment).
2. The ignition switch is in the OFF or ACC position and an UNLOCK command is activated.
3. The ignition switch is turned from RUN or START to ACC or OFF.

The front interior lamp will turn off when all of the vehicle's doors are closed (not including the tailgate or luggage compartment) and any of the following occurs

1. 25 seconds has elapsed since either the lights were turned on or the last door was closed while the vehicle is not locked (whichever occurs first).
2. The ignition switch is turned from OFF or ACC to RUN or START.
3. The ignition switch is in the OFF or ACC position and a LOCK command is activated.

In addition, the front interior lamp turns off when the battery saver relay timer has expired.

When the interior lamps are being turned off due to the battery saver feature, the lamps will be turned off immediately, with no delay (ramp down).

Normal Operation

The generic electronic module (GEM) grounds the control side of the battery saver relay located in the central junction box (CJB). When the relay is energized, voltage is supplied to the interior lamps through circuit 29-LC7 (OG/BU). The GEM monitors the door ajar switch status on circuits 31S-GL9 (BK/YE) (LH front), 31S-GL12 (BK/OG) (LH rear), 31S-GL16 (BK/BU) (RH front) and 31S-GL19 (BK/GN) (RH rear). The door ajar switches are normally open when the doors are closed. When the GEM determines a door is open, the GEM then controls the ground side of the interior lamp on circuit 31S-LC7 (BK/BU) to illuminate the interior lamp.

The generic electronic module (GEM) grounds the control side of the battery saver relay located in the central junction box (CJB). When the relay is energized, voltage is supplied to the cargo lamp through circuits 29-LC7 (OG/BU) and 29-LB6 (OG/YE). The ajar switch controls the ground side of the cargo lamp on circuits 31S-LB6 (BK/YE) and 31S-LB1 (BK/BU) to illuminate the cargo lamp.

The generic electronic module (GEM) monitors the door ajar switch status on circuits 31S-GL9 (BK/YE) (LH front), 31S-GL12 (BK/OG) (LH rear), 31S-GL16 (BK/BU) (RH front) and 31S-GL19 (BK/GN) (RH rear). The door ajar switches are normally open when the doors are closed. When the GEM determines a door is open, the GEM then controls the ground side of the interior lamp on circuit 31S-LC7 (BK/BU) to illuminate the interior lamp.

The generic electronic module (GEM) monitors the door ajar switch status on circuits 31S-GL9 (BK/YE) (LH front), 31S-GL12 (BK/OG) (LH rear), 31S-GL16 (BK/BU) (RH front) and 31S-GL19 (BK/GN) (RH rear). The door ajar switches are normally open when the doors are closed. When the GEM determines a door is open, the GEM then controls the ground side of the interior lamp on circuit 31S-LC7 (BK/BU) to illuminate the interior lamp.

The illuminated entry feature is activated by the generic electronic module (GEM). The GEM receives a signal transmitted by the RKE transmitter. The GEM then grounds the control side of the battery saver relay. When the relay is energized, voltage is supplied to the interior lamps through circuit 29-LC7 (OG/BU).

The generic electronic module (GEM) provides a ground circuit for the battery saver relay. The battery saver relay provides power to circuit 29-LC7 (OG/BU). Circuit 29-LC7 (OG/BU) provides power to each demand lamp switch. When the demand lamp switch is activated, power is provided to the selected demand lamp. The demand lamps are grounded through circuit 31-LC7 (BK).

The generic electronic module (GEM) provides a ground circuit for the battery saver relay located in the Central Junction Box (CJB) through circuit 31S-LC22 (BK/OG). The battery saver relay provides power to circuit 29-LC7 (OG/BU). Circuit 29-LC7 (OG/BU) provides power to each demand lamp switch. When the demand lamp switch is activated, power is provided to the selected demand lamp.

The generic electronic module (GEM) monitors the trunk ajar status on circuit 31S-GL20 (BK/RD). The trunk ajar switch is a dual throw style switch. One side of the switch is normally closed when the luggage compartment is closed, and the other side is open when the luggage compartment is closed. When the GEM determines the luggage compartment is open, the GEM then energizes the battery saver relay. When the relay is energized, voltage is supplied to the luggage compartment lamp through circuits 29-LC7 (OG/BU) and 29-LB25 (OG/BU). The ajar switch controls the ground side of the luggage compartment lamp on circuit 31-AA27 (BK) to illuminate the luggage compartment lamp.

See also:
• COMPONENT TESTING