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Home >> Nissan-Datsun >> 2011 >> Sentra L4-2.0L (MR20DE) >> Repair and Diagnosis >> Lighting and Horns >> Courtesy Lamp >> Description and Operation >> System Description

System Description





INTERIOR ROOM LAMP


System Description

When room lamp switch is in DOOR position, room lamp ON/OFF is controlled by timer according to signals from switches including key switch, front door switch LH, unlock signal from keyfob, door lock and unlock switch, key cylinder lock and unlock switch, ignition switch.
When room lamp turns ON, there is a gradual brightening over 1 second.
When room lamp turns OFF, there is a gradual dimming over 1 second.
Interior room lamp timer is controlled by BCM (body control module).
Interior room lamp timer control settings can be changed with CONSULT-III.

POWER SUPPLY AND GROUND
Power is supplied at all times (without Intelligent Key system)
- through 10A fuse [No. 19, located in fuse block (J/B)]
- to key switch terminal 2, - through 10A fuse [No. 21, located in fuse block (J/B)]
- to BCM terminal 57, - through 50A fusible link (letter j, located in fuse and fusible link box)
- to BCM terminal 70.
Power is supplied at all times (with Intelligent Key system)
- through 10A fuse (No. 9, located in fuse and fusible link box)
- to key switch and ignition knob switch terminals 2 and 4, - through 10A fuse [No. 21, located in fuse block (J/B)]
- to BCM terminal 57, - through 50A fusible link (letter j, located in fuse and fusible link box)
- to BCM terminal 70.
When key is inserted in the key switch, power is supplied (without Intelligent Key system)
- through key switch terminal 1
- to BCM terminal 37.
When key is inserted in the key switch and ignition knob switch, power is supplied (with Intelligent Key system)
- through key switch and ignition knob switch terminal 1
- to BCM terminal 37.
When ignition knob switch is pushed, power is supplied (with Intelligent Key system)
- through key switch and ignition knob switch terminal 3
- to Intelligent Key unit terminal 27.
With the ignition switch in the ON or START position, power is supplied
- through 10A fuse [No. 12, located in fuse block (J/B)]
- to BCM terminal 38.
Ground is supplied
- to BCM terminal 67
- through grounds M57 and M61.
When front door LH is opened, ground is supplied
- to BCM terminal 47
- through front door switch LH terminal 2
- through case ground of front door switch LH.
When front door RH is opened, ground is supplied
- to BCM terminal 12
- through front door switch RH terminal 2
- through case ground of front door switch RH.
When rear door LH is opened, ground is supplied
- to BCM terminal 48
- through rear door switch LH terminal 2
- through case ground of rear door switch LH.
When rear door RH is opened, ground is supplied
- to BCM terminal 13
- through rear door switch RH terminal 2
- through case ground of rear door switch RH.
When trunk is opened, ground is supplied
- to BCM terminal 42
- through trunk room lamp switch terminal 1
- through trunk room lamp switch terminal 2
- through grounds B7 and B19.
When front door LH is unlocked by front door key cylinder switch LH, the BCM receives a ground signal
- to BCM terminal 7
- through front door key cylinder switch LH terminal 5
- through front door key cylinder switch LH terminal 4
- through grounds M57 and M61.
When a signal, or combination of signals is received by BCM, ground is supplied
- to interior room lamp terminal 1
- through BCM terminal 63.
With power and ground supplied, the interior room lamp illuminates.

SWITCH OPERATION
Power is supplied
- through BCM terminal 56
- to trunk room lamp terminal 1, - to vanity mirror lamp LH and RH terminal 2 (with vanity lamps), - to map lamp terminal 2 (with map lamp) and
- to interior room lamp terminal 2.
When trunk room lamp is ON (trunk is open), ground is supplied
- to trunk room lamp terminal 2
- through BCM terminal 49.
When vanity mirror lamp LH or RH switch is ON (with vanity lamps), ground is supplied
- to vanity mirror lamp LH or RH terminal 1
- through grounds M57 and M61.
When map lamp switch is ON (with map lamp), ground is supplied
- to map lamp terminal 1
- through grounds M57 and M61.
When interior room lamp switch is ON, ground is supplied
- to interior room lamp
- through interior room lamp case ground.

INTERIOR ROOM LAMP TIMER OPERATION

Without Intelligent Key System
When room lamp switch is in DOOR position, and when all conditions below are met, BCM performs timer control (maximum 30 seconds) for room lamp ON/OFF.
In addition, when the interior room lamp turns ON or OFF there is gradual brightening or dimming over 1 second.
Power is supplied
- through 10A fuse [No. 19, located in fuse block (J/B)]
- to key switch terminal 2.
When the key is removed from ignition key cylinder (key switch OFF), power will not be supplied to BCM terminal 37.
When front door lock assembly LH (key cylinder switch) is unlocked, ground is supplied
- to BCM terminal 7
- through front door key cylinder switch LH terminal 5
- through front door key cylinder switch LH terminal 4
- through grounds M57 and M61.
At the time that front door LH is opened, BCM detects that front door LH is unlocked. It determines that interior room lamp timer operation condition is met, and turns the room lamp ON for 30 seconds.
When key is in ignition key cylinder, Power is supplied
- through key switch terminal 1
- to BCM terminal 37.
When key is removed from key switch (key switch OFF), the power supply to BCM terminal 37 is terminated.
BCM detects that key has been removed, determines that interior room lamp timer conditions are met, and turns the room lamp ON for 30 seconds.
When front door LH opens to closes, and the key is not inserted in the key switch (key switch OFF), voltage at
BCM terminal 47 changes between 0V (door open) to 12V (door closed). The BCM determines that conditions for room lamp operation are met and turns the room lamp ON for 30 seconds.
Interior room lamp timer control is canceled under the following conditions
- Front door LH is locked (locked front door key cylinder switch LH).
- Front door LH is opened (front door switch LH).
- Ignition switch ON.

With Intelligent Key System
When the room lamp switch is in DOOR position, and when all conditions below are met, BCM performs timer control (maximum 30 second) for room lamp ON/OFF.
In addition, when interior room lamp turns ON or OFF there is gradual brightening or dimming over 1 second.
Power is supplied
- through 10A fuse [No. 9, located in fuse block (J/B)]
- to key switch and ignition knob switch terminals 2 and 4.
37. When key is removed from ignition key cylinder (key switch OFF), power will not be supplied to BCM terminal
When the ignition knob switch is released, power will not be supplied to Intelligent Key unit terminal 27.
When front door key cylinder switch LH is unlocked, ground is supplied
- to BCM terminal 7
- through front door key cylinder switch LH terminal 5
- through front door key cylinder switch LH terminal 4
- through grounds M57 and M61.
At the time the front door LH is opened, the BCM detects the front door LH is unlocked. It determines that the interior room lamp timer operation conditions are met, and interior room lamp ON for 30 seconds.
When the key is in ignition key cylinder (key switch ON), or ignition knob switch is pushed, power is supplied
- through key switch and ignition knob switch terminal 1
- to BCM terminal 37, or
- through key switch and ignition knob switch terminal 3
- to Intelligent Key unit terminal 27.
When the key is removed from key switch (key switch OFF), power supply to BCM terminal 37 is terminated.
When the ignition knob switch is released, power supply to intelligent key unit is terminated. The BCM detects that the key has been removed, determines that interior room lamp timer conditions are met, and turns room lamp ON for 30 seconds.
When the front door LH opens to closes, and key is not inserted in key switch (or ignition knob switch is released), BCM terminal 47 changes between 0V (door open) to 12V (door closed). BCM determines that conditions for room lamp operation are met, and turns room lamp ON for 30 seconds.
Interior room lamp timer control is canceled under the following conditions:
- Front door LH is locked (with keyfob or front door key cylinder switch LH).
- Front door LH is opened (front door switch LH).
- Ignition switch ON.

INTERIOR LAMP BATTERY SAVER CONTROL
If an interior room lamp is left ON, it will not be turned OFF even when door is closed.
BCM turns off interior lamp automatically to save battery 30 minutes after ignition switch is turned off.
After lamps are turned OFF by the battery saver system, the lamps illuminate again when
- front door key cylinder switch LH is locked or unlocked
- door is opened or closed
- key is removed from ignition key cylinder or inserted in ignition key cylinder, or the ignition knob switch is pushed or released (with intelligent key system).
Interior lamp battery saver control time period can be changed by the function setting of CONSULT-III.
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