Infiniti F50. Manual - part 658

INTERIOR ROOM LAMP

LT-99

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Description

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In this mode, when BCM detects the input signal from a switch in IVMS as shown below, the detection is
indicated by the map lamp and front step lamps with buzzer.

Switch monitor item

●

The status of the switch (except the ignition switch, interior lamp ill switch, and map lamp switch) as input
to each control unit can be monitored.

Cancel of Switch Monitor

If the following conditions are satisfied, the communication diagnosis is cancelled.

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Turn ignition switch OFF.

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Drive the vehicle more than 7 km/h (4 MPH).

Symptom Chart

EKS000X5

*1: When BCM input/output signal are normal .

PIIA0177E

Control unit

Item

BCM

Lighting switch (AUTO, 1st position)

Each door switch

Driver door LCU

Door locking detection switch

Symptom

Malfunctioning system and reference 

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Map lamp, and personal lamp will not illuminate when the interior 
lamp ill switch is turned ON with the personal lamp switch in 
AUTO position.

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Map lamp, and personal lamp will not go out when the interior 
lamp ill switch is turned OFF with the personal lamp switch in 
AUTO position.

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Interior lamp ill switch system. Refer to

LT-100, "Interior Lamp 

ILL Switch System Check"

 . 

If above systems are normal, replace the BCM.

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Personal lamp will not illuminate when RH personal lamp switch 
is turned ON with LH personal lamp switch in AUTO position.

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Personal lamp will not illuminate when LH personal lamp switch 
is turned ON with RH personal lamp switch in AUTO position.

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Personal lamp switch will not go out when both RH and LH per-
sonal lamp switches are turned to AUTO position.

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Personal lamp switch system. Refer to 

LT-102, "Personal 

Lamp Switch System Check"

 . 

If above system is normal, replace the BCM.

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All lamps (except step lamp) will not illuminate in the lamp illumi-
nation conditions with the interior lamp ill switch and RH and LH 
personal lamp switches in AUTO position.

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All lamps (except step lamp) will not go out in the lamp off condi-
tions with the interior lamp switch and RH and LH personal lamp 
switches in AUTO position.

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Interior lamp ill switch system. Refer to 

LT-100, "Interior Lamp 

ILL Switch System Check"

 .

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Door switch system. Refer to

LT-103, "Door Switch System 

Check"

 .

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Key-in detection switch system. Refer to

LT-105, "Key Switch 

and Key Lock Solenoid System Check"

 .

If above system is normal, replace the BCM.

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Lamps illuminate fully in half illumination conditions.

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Dimming function will not operate when turning the lamp off.

Replace the BCM.*1

LT-100

INTERIOR ROOM LAMP

Interior Lamp ILL Switch System Check

EKS000X6

1. 

CHECK INTERIOR LAMP ILL SWITCH SIGNAL 

1.

Turn the ignition switch OFF.

2.

Disconnect the BCM connector.

3.

Check continuity between BCM harness connector R4 terminal
130 (W/L), 131 (G/Y) and body ground while operating the inte-
rior lamp ill switch.

OK or NG

OK

>> Interior lamp ill switch is OK.

NG

>> GO TO 2.

2. 

CHECK WIRE HARNESS CONTINUITY

1.

Disconnect the front interior lamp connector.

2.

Check continuity at the harness between BCM harness connec-
tor R4 terminals 130 (W/L), 131 (G/Y) and front interior lamp
harness connector R6 terminals 6 (W/L), 7 (G/Y).

3.

Check continuity between BCM harness connector R4 terminals
130 (W/L), 131 (G/Y) and body ground.

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace harness.

Terminals

Condition

Continuity

(+)

(–)

Connector

Terminal 

(Wire 

color)

Terminal

R4

130(W/L)

Body 

ground

Interior lamp 
ill switch ON

Yes

Interior lamp 
ill switch OFF 
and AUTO

No

131(G/Y)

Body 

ground

Interior lamp 
ill switch OFF

Yes

Interior lamp 
ill switch ON 
and AUTO

No

SKIA0435E

Terminals

Continuity

(+)

(–)

Connector

Terminal 

(Wire 

color)

Connector

Terminal 

(Wire 

color)

R4

130(W/L)

R6

6(W/L)

Yes

131(G/Y)

R6

7(G/Y)

Yes

130(W/L)

Body ground

No

131(G/Y)

SKIA0436E

INTERIOR ROOM LAMP

LT-101

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3. 

CHECK GROUND CIRCUIT

Check continuity between the front interior lamp harness connector R6 terminal 3(B) and body ground.

OK or NG

OK

>> Check interior lamp ill switch.

NG

>> Repair or replace harness.

3(B) - Body ground

: Continuity should exist.

SKIA0437E

LT-102

INTERIOR ROOM LAMP

Personal Lamp Switch System Check

EKS000X7

1. 

CHECK PERSONAL LAMP SWITCH SIGNAL

1.

Turn the ignition switch OFF.

2.

Disconnect the BCM connector.

3.

Check continuity between BCM harness connector R4 terminal
129(G) and body ground while operating the personal lamp
switch.

OK or NG

OK

>> Personal lamp switch is OK.

NG

>> GO TO 2.

2. 

CHECK WIRE HARNESS CONTINUITY

1.

Disconnect the rear interior lamp connector.

2.

Check continuity between BCM harness connector R4 terminal
129(G) and the rear interior lamp harness connector R13 termi-
nal 5(G) while operating the personal lamp switch.

3.

Check continuity between BCM harness connector R4 terminal
129(G) and body ground.

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace harness.

3. 

CHECK GROUND CIRCUIT

Check continuity between the rear interior lamp harness connector
R13 terminal 3(B) and body ground.

OK or NG

OK

>> Replace personal lamp switch.

NG

>> Repair or replace harness.

RH and LH personal 
lamp switches in HALF 
or AUTO position

: Continuity should not exists.

RH or LH personal lamp 
switch in FULL position

: Continuity should exists.

SKIA0438E

129(G) - 5(G)

: Continuity should exist.

129(G) - Body ground

: Continuity should not exist.

SKIA3766E

3(B) - Body ground

: Continuity should exist.

SKIA3767E