Infiniti M45 (Y34). Manual — part 629
HEADLAMP (FOR USA)
LT-23
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SWITCH MONITOR
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Perform the diagnosis on the switch system to each control unit.
How to Perform Switch Monitor
Description
●
In this mode, when BCM detects the input signal from a switch in IVMS as shown below, the detection is
indicated by the map lamps 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.
●
Turn ignition switch OFF.
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Drive the vehicle more than 7 km/h (4 MPH).
PKIA7882E
PIIA0177E
Control unit
Item
BCM
Lighting switch (AUTO, 1ST position)
Front door switch (Driver side)
Front door switch (Passenger side)
LT-24
HEADLAMP (FOR USA)
Symptom Chart 1
AKS002F6
HEADLAMP SYSTEM
Symptom Chart 2
AKS003ZN
AUTO LIGHT SYSTEM
Symptom
Possible cause and reference
Neither headlamp operates.
●
Refer to
LT-25, "Power Supply and Ground Circuit Inspection"
.
●
Refer to
LT-31, "Lighting Switch Circuit Inspection"
.
If above systems are normal, replace the headlamp battery saver
control unit.
Headlamp (low beam) does not operate, but headlamp (high
beam) does operate.
●
Refer to
LT-25, "Power Supply and Ground Circuit Inspection"
.
●
Refer to
LT-26, "Headlamp Relay-1 Circuit Inspection"
If above systems are normal, replace the headlamp battery saver
control unit.
Headlamp (high beam) does not operate, but headlamp (low
beam) does operate.
●
Refer to
LT-25, "Power Supply and Ground Circuit Inspection"
.
●
Refer to
LT-27, "Headlamp Relay-2 Circuit Inspection"
If above systems are normal, replace the headlamp battery saver
control unit.
RH low beam does not operate, but LH low beam does operate.
●
Refer to
LT-25, "Power Supply and Ground Circuit Inspection"
.
●
Refer to
LT-26, "Headlamp Relay-1 Circuit Inspection"
●
Refer to
LT-28, "Headlamp (Low) Circuit Inspection"
LH low beam does not operate, but RH low beam does operate.
RH high beam does not operate, but LH high beam does operate.
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Refer to
LT-29, "Headlamp (High) Circuit Inspection"
●
Refer to
LT-31, "Lighting Switch Circuit Inspection"
.
LH high beam does not operate, but RH high beam does operate.
High beam indicator does not work.
●
Refer to
LT-31, "High Beam Indicator Circuit Inspection"
If above systems are normal, replace the combination meter.
Battery saver control does not operate properly.
●
Refer to
LT-33, "Front Door Switch Circuit Inspection"
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Refer to
LT-34, "Headlamp Battery Saver Control Unit Circuit
●
Refer to
LT-31, "Lighting Switch Circuit Inspection"
.
If above systems are normal, replace the headlamp battery saver
control unit.
Symptom
Possible cause and reference
●
Parking (clearance) lamps and headlamps will not illuminate
when outside of the vehicle becomes dark. (Lighting switch 1st
position and 2nd position operate normally.)
●
Parking (clearance) lamps and headlamp will not go out when
outside of the vehicle becomes light. (Lighting switch 1st position
and 2nd position operate normally.)
●
Refer to
LT-35, "Lighting Switch (AUTO) System Inspection"
●
Refer to
LT-36, "Optical Sensor System Inspection"
If above systems are normal, replace the BCM.
Parking (clearance) lamps illuminate when outside of the vehicle
becomes dark, but headlamp stay off. (Lighting switch 1st position
and 2nd position operate normally.)
●
Refer to
LT-38, "Headlamp Relay System Inspection"
●
Refer to
LT-36, "Optical Sensor System Inspection"
If above systems are normal, replace the BCM.
●
Headlamps illuminate when outside of the vehicle becomes
dark, but clearance lamps stay off. (Lighting switch 1st position
and 2nd position operate normally.)
●
Headlamps go out when outside of the vehicle becomes light,
but parking (clearance) lamps stay on.
●
Refer to
LT-38, "Tail Lamp Relay System Inspection"
If above system is normal, replace the BCM.
HEADLAMP (FOR USA)
LT-25
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LT
Power Supply and Ground Circuit Inspection
AKS003RY
1.
CHECK FUSE
Check if the headlamp battery saver control unit, headlamp relay-1 and -2 fuses are blown.
Refer to
LT-11, "Wiring Diagram — H/LAMP —"
.
OK or NG
OK
>> GO TO 2.
NG
>> If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse.
2.
CHECK HEADLAMP BATTERY SAVER CONTROL UNIT POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect headlamp battery saver control unit connector.
3.
Check voltage between headlamp battery saver control unit har-
ness connector M34 terminal 7 (Y/G) and ground.
OK or NG
OK
>> GO TO 3.
NG
>> Check harness for open or short between headlamp
battery saver control unit and fuse.
3.
CHECK HEADLAMP RELAY-1 POWER SUPPLY CIRCUIT
1.
Remove headlamp relay-1.
2.
Check voltage between headlamp relay-1 harness connector
E3-4 terminals 2, 3 or 7 and ground.
OK or NG
OK
>> GO TO 4.
NG
>> Replace fuse, fusible link and relay block (J/B).
Unit or relay
Power source
Fuse No.
Headlamp battery saver control unit
Battery
6
Headlamp relay-1
Battery
55
57
Headlamp relay-2
Battery
73
7 (Y/G) - Ground
: Battery voltage should exist.
PKIA5841E
Terminals
Ignition switch position
(+)
(-)
OFF
Connector
Terminal
E3 - 4
2
Ground
Battery voltage
3
7
PKIA5842E
LT-26
HEADLAMP (FOR USA)
4.
CHECK HEADLAMP RELAY-2 POWER SUPPLY CIRCUIT
1.
Remove headlamp relay-2.
2.
Check voltage between headlamp relay-2 harness connector E5
terminal 1 (PU) and ground.
3.
Check voltage between headlamp relay-2 harness connector E5
terminal 3 (PU) and ground.
OK or NG
OK
>> GO TO 5.
NG
>> Check harness for open or short between headlamp relay-2 and fuse.
5.
CHECK HEADLAMP BATTERY SAVER CONTROL UNIT GROUND CIRCUIT
Check continuity between headlamp battery saver control unit har-
ness connector terminals and ground.
OK or NG
OK
>> INSPECTION END
NG
>> Check harness.
Headlamp Relay-1 Circuit Inspection
AKS003S0
1.
CHECK HEADLAMP RELAY-1
1.
Turn ignition switch OFF.
2.
Remove headlamp relay-1.
3.
Apply 12V between headlamp relay-1 terminals 2 and 1, and
check continuity between terminals 3 and 5 and between 6 and
7.
OK or NG
OK
>> GO TO 2.
NG
>> Replace headlamp relay-1.
1 (PU) - Ground
: Battery voltage should exist.
3 (PU) - Ground
: Battery voltage should exist.
PKIA5843E
Terminals
Continuity
Connector
Terminal (Wire color)
M33
4 (B)
Ground
Yes
M34
11 (B)
PKIA5844E
3 - 5
: Continuity should exist.
6 - 7
: Continuity should exist.
PKIA5845E
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