2007 INFINITI QX56 turn signal

AT-204
< SERVICE INFORMATION >
A/T SHIFT LOCK SYSTEM
Shift Lock Control Unit Reference Value
INFOID:0000000003532472
SHIFT LOCK HARNESS CONNECTOR TERMINALS LAYOUT
SHIFT LOCK CONTROL UNIT INSPECTION TABLE
Data are reference values.
NOTE:
Confirm that the pointer swings only momentarily because the output time is so short. If the inspection is done with an oscilloscope, it
should be observed that the power source voltage lasts for 3.5 to 10 ms.
Component InspectionINFOID:0000000003532473
SHIFT LOCK SOLENOID
WCIA0550E
TER-
MINAL
NO.WIRE
COLORITEM CONDITIONVOLTAGE
(Approx.)
1Y/RPower sourceIgnition switch: “ON” Battery voltage
Ignition switch: “OFF” Battery voltage
2L/R Detention switch (for
key)When selector lever is not in "P" position with key inserted. Battery voltage
Except the above 0V
3GRDetention switch (for
shift)When selector lever is not in "P" position Battery voltage
Except the above 0V
4 R/G Stop lamp switchWhen brake pedal is depressed Battery voltage
When brake pedal is released 0V
5 W/R Vehicle speed signal — —
6 G/R Ignition signalIgnition switch: “OFF” 0V
Ignition switch: “ON” Battery voltage
7 R/W Shift lock solenoidWhen brake pedal is depressed with ignition switch "ON". 0V
When brake pedal is depressed. Battery voltage
8 B Ground Always 0V
9 G/W Key lock solenoidWhen the selector lever is set to a position other than the “P” po-
sition, and the key switch is turned from “ON” to “OFF”Battery voltage for ap-
prox. 0.1 sec. (Note)
Except the above 0V
10 W/G Key unlock solenoidWhen ignition switch is not in "ON” position with key inserted.Battery voltage for ap-
prox. 0.1 sec. (Note)
Except the above 0V

ATC-22
< SERVICE INFORMATION >
AIR CONDITIONER CONTROL
AIR CONDITIONER CONTROL
DescriptionINFOID:0000000003533233
The front air control provides automatic regulation of the vehicle's interior temperature. The system is based
on the driver's and passenger's selected "set temperat ure", regardless of the outside temperature changes.
This is done by utilizing a microcomputer, also referred to as the front air control, which receives input signals
from the following seven sensors:
• Ambient sensor
• In-vehicle sensor
• Intake sensor
• Optical sensor (providing one input for driver and one input for passenger side)
• PBR (Position Balanced Resistor)
• Vehicle speed sensor (via CAN communication)
• Engine coolant temperature (via CAN communication)
The front air control uses these signals (including the set temperature) to automatically control:
• Outlet air volume
• Air temperature
• Air distribution
The front air control also provides separate regulation of the vehicle's interior temperature for the rear passen-
ger area. The system is based on the temperature and r ear blower settings selected from rear control
switches located on the front air control, or from the temperature and rear blower settings selected from rear
control switches on the rear air control, when the front air control switches are set to the rear position.
The front air control is used to select: • Outlet air volume
• Air temperature/distribution
OperationINFOID:0000000003533234
AIR MIX DOORS CONTROL
The air mix doors are automatically controlled so that in-vehicle temperature is maintained at a predetermined
value by the temperature setting, ambient temper ature, in-vehicle temperature and amount of sunload.
BLOWER SPEED CONTROL
Blower speed is automatically controlled by the temperat ure setting, ambient temperature, in-vehicle tempera-
ture, intake temperature, amount of sunload and air mix door position.
When AUTO switch is pressed, the blower motor starts to gradually increase air flow volume (if required).
When engine coolant temperature is low, the blower moto r operation is delayed to prevent cool air from flow-
ing.
INTAKE DOOR CONTROL
The intake door is automatically controlled by the tem perature setting, ambient temperature, in-vehicle tem-
perature, intake temperature, amount of sunl oad and by the ON-OFF operation of the compressor.
MODE DOOR CONTROL
The mode door is automatically controlled by the temperat ure setting, ambient temperature, in-vehicle temper-
ature, intake temperature and amount of sunload.
DEFROSTER DOOR CONTROL
The defroster door is controlled by: Turning the defroster dial to front defroster.

AIR CONDITIONER CONTROLATC-23
< SERVICE INFORMATION >
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AT C
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MAGNET CLUTCH CONTROL
When A/C switch or DEF switch is pressed, front air control inputs compressor ON signal to BCM.
BCM sends compressor ON signal to ECM and front air control via CAN communication line.
ECM judges whether compressor can be turned ON, based on each sensor status (refrigerant pressure sen-
sor signal, throttle angle sensor, etc.). If it judges compressor can be turned ON, it sends compressor ON sig-
nal to IPDM E/R, via CAN communication line.
Upon receipt of compressor ON signal from ECM, IPDM E/R turns air conditioner relay ON to operate com-
pressor.
SELF-DIAGNOSTIC SYSTEM
The self-diagnostic system is built into the front air cont rol to quickly locate the cause of symptoms. Refer to
ATC-48, "
A/C System Self-Diagnosis Function"
Description of Control SystemINFOID:0000000003533235
The control system consists of input sensors, swit ches, the front air control (microcomputer) and outputs.
WJIA2144E

TROUBLE DIAGNOSISATC-47
< SERVICE INFORMATION >
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M A
B
AT C
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Front Air Control Termina l and Reference ValueINFOID:0000000003533247
Measure voltage between each terminal and ground by following
Terminals and Reference Value for front air control.
FRONT HARNESS CONNECTOR TERMINAL LAYOUT
TERMINALS AND REFERENCE VALUES FOR FRONT AIR CONTROL
WJIA0544E
WJIA2010E
Te r m i n a l
No. Wire
color ItemIgnition
switch Condition Voltage (V)
(Approx.)
1 B Ground - - 0V
2 Y Sensor power ON - 5V
3 W/G Air mix door motor (Driver) CW ON Clockwise rotation Battery voltage
4 G Air mix door motor (Driver) CCW ON Coun terclockwise rotation Battery voltage
5 BR/W Mode door motor CW ON Clockwise rotation Battery voltage
6 P/L Mode door motor CCW ON Counterclockw ise rotation Battery voltage
7 O Intake door motor CCW ON Counterclockwise rotation Battery voltage
8 G/B Intake door motor CW ON Clockwise rotation Battery voltage
9 L/B Intake sensor ON - 0 - 5V
10 L/R Fan ON signal ON Blower switch OFF 5V
ON Blower switch ON 0V
11 Y/B Rear defroster requ est ON - Battery voltage
12 W/R Compressor ON signal ON A/C switch OFF 5V
ON A/C switch ON 0V
13 G/R Variable blower control ON - 0 - 5V
14 Y/G Power supply for IGN ON - Battery voltage
15 P Sensor ground ON - 0V
16 GR Mode door motor feedback ON - 0 - 5V
17 P Ambient sensor ON - 0 - 5V
18 SB Air mix door motor (D river) feedback ON - 0 - 5V
19 LG Defroster door motor CW ON Clockwise rotation Battery voltage
20 P/B Defroster door motor CCW ON Counterclockwise rotation Battery voltage
21 V/R Sensor return ON - 0 - 5V

ATC-58
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
1. Turn ignition switch OFF.
2. Disconnect the front air control harness connector.
3. Check continuity between front air control harness connectorM49 terminal 2 and ground.
OK or NG
OK >> Replace front air control. Refer to ATC-123, "Removal
and Installation" .
NG >> Repair or replace harness as necessary.
8.CHECK PBR REFERENCE VOLTAGE AND GROUND CIRCUITS
1. Turn ignition switch OFF.
2. Disconnect the front air control harness connector.
3. Check continuity between front air control harness connector M49 terminal 2 and terminal 15.
OK or NG
OK >> GO TO 10.
NG >> GO TO 9.
9.CHECK PBR REFERENCE VO LTAGE CIRCUIT FOR OPEN
1. Disconnect the mode door motor harness connector.
2. Check continuity between mode door motor harness connector M142 (B) terminal 3, 1 and front air control harness connector
M49 (A) terminal 2, 15.
OK or NG
OK >> Replace mode door motor. Refer to ATC-140, "Removal
and Installation" .
NG >> Repair or replace harness as necessary.
10.CHECK PBR FEEDBACK VOLTAGE
1. Reconnect the front air control harness connector.
2. Turn ignition switch ON.
3. Check voltage between front air control harness connector M49 terminal 16 and ground while cycling mode switch through all
modes.
OK or NG
OK >> GO TO 12.
NG >> GO TO 11.
11 .CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR SHORT TO GROUND Continuity should not exist.
WJIA1730E
Continuity should exist.
WJIA1731E
2 - 3 : Continuity should exist.
15 - 1 : Continuity should exist.
WJIA1732E
Voltage : Approx. 1V - 4.5V
LJIA0032E

ATC-64
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
1. Disconnect the air mix door motor (driver) harness connector.
2. Check continuity between air mix door motor (driver) harnessconnector M147 (B) terminal 3, 2 and front air control harness
connector M49 (A) terminal 2, 15.
OK or NG
OK >> Replace air mix door motor (driver). Refer to ATC-141,
"Removal and Installation" .
NG >> Repair or replace harness as necessary.
10.CHECK PBR FEEDBACK VOLTAGE
1. Reconnect the front air control harness connector.
2. Turn ignition switch ON.
3. Check voltage between front air control harness connector M49 terminal 18 and ground while rotating temperature control dial
from 32 °C (90 °F) to 16 °C (60 °F).
OK or NG
OK >> GO TO 12.
NG >> GO TO 11.
11 .CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect front air control harness connector.
3. Check continuity between front air control harness connector M49 terminal 18 and ground.
OK or NG
OK >> Replace front air control. Refer to ATC-123, "Removal
and Installation".
NG >> Repair or replace harness as necessary.
12.CHECK PBR FEEDBACK CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect the air mix door motor (driver) harness connector and front air control harness connector.
3. Check continuity between air mix door motor (driver) harness connector M147 terminal 4 and front air control harness connec-
tor M49 terminal 18.
OK or NG
OK >> Replace air mix door motor (driver). Refer to "DIAG- NOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR
(DRIVER)" .
NG >> Repair or replace harness as necessary.
DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR (PASSENGER)
1.CHECK FRONT AIR CONTROL FOR POWER AND GROUND 2 - 3 : Continuity should exist.
15 - 2 : Continuity should exist.
WJIA1777E
Voltage : Approx. .5V - 4.5V
LJIA0041E
Continuity should not exist.
WJIA1739E
Continuity should exist.
WJIA0590E

TROUBLE DIAGNOSISATC-67
< SERVICE INFORMATION >
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M A
B
AT C
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1. Disconnect the air mix door mo tor (passenger) harness connec-
tor.
2. Check continuity between air mix door motor (passenger) har-
ness connector M143 (B) terminal 3, 2 and front air control har-
ness connector M49 (A) terminal 2, 15.
OK or NG
OK >> Replace air mix door motor (passenger). Refer to AT C -
141, "Removal and Installation" .
NG >> Repair or replace harness as necessary.
10.CHECK PBR FEEDBACK VOLTAGE
1. Reconnect the front air control harness connector.
2. Turn ignition switch ON.
3. Check voltage between front air control harness connector M50 terminal 41 and ground while rotating temperature control dial
(passenger) from 32 °C (90 ° F) to 16 °C (60 ° F).
OK or NG
OK >> GO TO 12.
NG >> GO TO 11.
11 .CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect front air control harness connector.
3. Check continuity between front air control harness connector
M50 terminal 41 and ground.
OK or NG
OK >> Replace front air control. Refer to ATC-123, "Removal
and Installation" .
NG >> Repair or replace harness as necessary.
12.CHECK PBR FEEDBACK CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect the air mix door mo tor (passenger) harness connec-
tor and front air control harness connector.
3. Check continuity between air mix door motor (passenger) har- ness connector M143 terminal 4 and front air control harness
connector M50 terminal 41.
OK or NG
OK >> Replace air mix door motor (passenger). Refer to AT C -
141, "Removal and Installation" .
NG >> Repair or replace harness as necessary.
DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR (REAR)
1.CHECK FRONT AIR CONTROL FOR POWER AND GROUND 2 - 3 : Continuity should exist.
15 - 2 : Continuity should exist.
WJIA1777E
Voltage : Approx. .5V - 4.5V
LJIA0047E
Continuity should not exist.
WJIA1743E
Continuity should exist.
WJIA0550E

ATC-70
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
1. Disconnect the air mix door motor (rear) harness connector.
2. Check continuity between air mix door motor (rear) harness con-nector B155 (B) terminal 3, 2 and front air control harness con-
nector M49 (A) terminal 2, 15.
OK or NG
OK >> Replace air mix door motor (rear). Refer to ATC-141,
"Removal and Installation".
NG >> Repair or replace harness as necessary.
10.CHECK PBR FEEDBACK VOLTAGE
1. Reconnect the front air control harness connector.
2. Turn ignition switch ON.
3. Check voltage between front air control harness connector M50 terminal 42 and ground while rotating temperature control dial
(rear) from maximum cold to maximum heat.
OK or NG
OK >> GO TO 12.
NG >> GO TO 11.
11 .CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect front air control harness connector.
3. Check continuity between front air control harness connector M50 terminal 42 and ground.
OK or NG
OK >> Replace front air control. Refer to ATC-123, "Removal
and Installation" .
NG >> Repair or replace harness as necessary.
12.CHECK PBR FEEDBACK CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect the air mix door motor (rear) harness connector and front air control harness connector.
3. Check continuity between air mix door motor (rear) harness con- nector B155 terminal 4 and front air control harness connector
M50 terminal 42.
OK or NG
OK >> Replace air mix door motor (rear). Refer to ATC-141,
"Removal and Installation".
NG >> Repair or replace harness as necessary.
Intake Door Motor CircuitINFOID:0000000003533254
SYMPTOM:• Intake door does not change.
• Intake door motor does not operate normally. 2 - 3 : Continuity should exist.
15 - 2 : Continuity should exist.
WJIA1748E
Voltage : Approx. 1V - 4.5V
LJIA0053E
Continuity should not exist.
WJIA1749E
Continuity should exist.
LJIA0054E