ignition INFINITI QX56 2006 Factory Owners Manual

ATC-36
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
Display Item List
*: DENT is displayed when MODE switch is between selections.
Monitor itemValue Contents
BATT VIA CAN "V" Displays battery voltage signal.
IGN VIA CAN "ON/OFF" Displays ignition switch signal.
DVR SUNLD SEN "w/m2" Displays optical sensor (driver) signal.
PAS SUNLD SEN "w/m2" Displays optical sensor (passenger) signal.
AMB TEMP SEN "° C/ °F" Displays ambient sensor 1 signal.
EVAP TEMP SEN "° C/ °F" Displays intake sensor signal.
INCAR TMP SEN "° C/ °F" Displays in-vehicle sensor signal.
RR TEMPSET FR "V" Displays air mix door (front) set point signal.
RR TEMPSET RR "V" Displays air mix door (rear) set point signal.
MODE FDBCK "V" Displays mode door motor feedback signal.
DVR MIX FDBCK "V" Displays air mix door motor (driver) feedback signal.
PAS MIX FDBCK "V" Displays air mix door motor (passenger) feedback signal.
RR FDBCK "V" Displays air mix door motor (rear) feedback signal.
DEF FDBCK "V" Displays defroster door motor feedback signal.
RECIRC "ON/OFF" Displays recirculation switch signal.
DEFROST "ON/OFF" Displays defroster switch signal.
AUTO "ON/OFF" Displays AUTO switch signal.
A/C "ON/OFF" Displays A/C switch signal.
MODE "ON/OFF" Displays MODE switch signal.
L TEMP UP "ON/OFF" Displays driver side temperature control dial (temp increase) signal.
L TEMP DOWN "ON/OFF" Displays driver side temperature control dial (temp decrease) signal.
R TEMP UP "ON/OFF" Displays rear temperature control dial [front (temp increase)] signal.
R TEMP DOWN "ON/OFF" Displays Rear temperature control dial [front (temp decrease)] signal.
RR DEFOG "ON/OFF" Displays rear defroster request signal.
FANUP "ON/OFF" Displays front blower motor (blower speed increase) signal.
FANDOWN "ON/OFF" Displays front blower motor (blower speed decrease) signal.
MODE SELECT " [ PNL ]"
" [ MIX ]"
" [ FLR ]"
" [ DEFR ]" " [ MAX ]"
" [ DENT ]" Displays mode door motor position.

TROUBLE DIAGNOSISATC-37
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CONSULT-II Function (BCM)EJS003XE
CONSULT-II can display each diagnostic item using the diagnostic test modes shown following.
CONSULT-II BASIC OPERATION
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carries out CAN communication.
1. With the ignition switch OFF, connect CONSULT-II and “CON-
SULT-II CONVERTER ” to the data link connector, and turn the
ignition switch ON.
2. Touch “START (NISSAN BASED VHCL) ”.
3. Touch “BCM” on “SELECT SYSTEM ” screen. If “BCM” is not
indicated, go to GI-40, "
CONSULT-II Data Link Connector (DLC)
Circuit" .
BCM diagnostic
test item Diagnostic mode
Description
Inspection by part WORK SUPPORT
Supports inspections and adjustments. Commands are transmitted to the BCM
for setting the status suitable for required operation, input/output signals are
received from the BCM and received data is displayed.
DATA MONITOR Displays BCM input/output data in real time. ACTIVE TEST Operation of electrical loads can be checked by sending drive signal to them.
SELF-DIAG RESULTS Displays BCM self-diagnosis results.
CAN DIAG SUPPORT MNTR The result of transmit/receive diagnosis of CAN communication can be read. ECU PART NUMBER BCM part number can be read.CONFIGURATION Performs BCM configuration read/write functions.
BBIA0369E
BCIA0029E
BCIA0030E

ATC-38
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
DATA MONITOR
Operation Procedure
1. Touch “AIR CONDITIONER” on “SELECT TEST ITEM” screen.
2. Touch “DATA MONITOR ” on “SELECT DIAG MODE ” screen.
3. Touch either “ALL SIGNALS ” or “SELECTION FROM MENU” on
“DATA MONITOR ” screen.
4. When “SELECTION FROM MENU” is selected, touch items to
be monitored. When "ALL SIGNALS ” is selected, all the items
will be monitored.
5. Touch “START”.
6. Touch “RECORD” while monitoring, then the status of the moni-
tored item can be recorded. To stop recording, touch “STOP”.
Display Item List
WJIA0468E
BCIA0031E
ALL SIGNALS Monitors all the items.
SELECTION FROM MENU Selects and monitors the individual item selected.
WJIA0469E
Monitor item name “ operation or
unit ” Contents
IGN ON SW “ON/OFF ”Displays “IGN Position (ON)/OFF, ACC Position (OFF) ” status as judged from ignition switch signal.
COMP ON SIG “ON/OFF ”Displays “COMP (ON)/COMP (OFF) ” status as judged from air conditioner switch signal.
FAN ON SIG “ON/OFF ”Displays “FAN (ON)/FAN (OFF) ” status as judged from blower motor switch signal.

ATC-54
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
Front Air Control Terminals and Reference ValueEJS003XJ
Measure voltage between each terminal and ground by following
Terminals and Reference Value for front air control.
PIN CONNECTOR TERMINAL LAYOUT
TERMINALS AND REFERENCE VALUE FOR FRONT AIR CONTROL
WJIA0544E
WJIA0402E
Te r m i -
nal 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 Counterclockwise rotation Battery voltage
5 BR/W Mode door motor CW ON Clockwise rotationBattery voltage
6 P/L Mode door motor CCW ON Counterclockwise rotationBattery voltage
7 O Intake door motor CCW ON Counterclockwise rotationBattery voltage
8 G/B Intake door motor CW ON Clockwise rotationBattery 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 request 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 (Driver) feedback ON -0 - 5V
19 LG Defroster door motor CW ON Clockwise rotationBattery voltage
20 P/B Defroster door motor CCW ON Counterclockwise rotationBattery voltage
21 V/R Sensor return ON- 0 - 5V

TROUBLE DIAGNOSISATC-55
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22 Y/R Power supply for BAT-- Battery voltage
23 R/L Illumination + ON Park lamps ONBattery voltage
24 BR Illumination - - Park lamps ON
25 LG/B Defroster door motor feedback ON -0 - 5V
26 R/B Front blower request ONFront blower motor OFF
Battery voltage
Front blower motor ON 0V
27 GR/R Air mix door motor (Rear) CW ON Clockwise rotationBattery voltage
28 L/Y Air mix door motor (Rear) CCW ON Counterclockwise rotation Battery voltage
29 Y/L Water valve ONWater valve open
0V
Water valve closed 5V
30 W/G Water valve ONWater valve open
0V
Water valve closed Battery voltage
31 W/V Optical sensor (Passenger) ON- 0 - 5V
32 LG/R In-vehicle sensor signal ON- 0 - 5V
33 V Air mix door (Rear) set point ON- 0 - 5V
34 L CAN-H ON- 0 - 5V
35 P CAN-L ON- 0 - 5V
36 G/W Air mix door motor (Passenger) CW ON Clockwise rotation Battery voltage
37 L Air mix door motor (Passenger)
CCW ON Counter clockwise rotation
Battery voltage
38 W/L Rear blower request ONFront blower motor OFF
Battery voltage
Front blower motor ON 0V
39 Y/B Rear select signal ON- 0V - Battery voltage
40 G/O Optical sensor (Driver) ON- 0 - 5V
41 R/W Air mix door motor (Passenger)
feedback ON
- 0 - 5V
42 R/Y Air mix door motor (Rear) feedback ON -0 - 5V
43 BR/Y In-vehicle sensor motor (+) ON- Battery voltage
44 O/B In-vehicle sensor motor (-) ON- 0V
Te r m i -
nal No. Wire
color Item
Ignition
switch Condition
Voltage (V)
(Approx.)
PIIA2344E

ATC-58
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
Operational Check (Front)EJS003XL
The purpose of the operational check is to confirm that the system operates properly.
CHECKING MEMORY FUNCTION
1. Set the temperature to 90°F or 32 °C.
2. Turn front blower control dial counterclockwise until system shuts OFF.
3. Turn ignition switch OFF.
4. Turn ignition switch ON.
5. Press the AUTO switch.
6. Confirm that the set temperature remains at previous temperature.
7. Turn front blower control counterclockwise until system shuts OFF.
If NG, go to trouble diagnosis procedure for ATC-131, "
Memory Function" .
If OK, continue with next check.
CHECKING BLOWER
1. Turn front blower control clockwise, blower should operate on low speed. The blower symbol should have one blade lit (on display).
2. Turn the front blower control dial again, and continue checking blower speed and blower symbol until all speeds are checked.
3. Leave blower on MAX speed.
If NG, go to trouble diagnosis procedure for AT C - 9 5 , "
DIAGNOSTIC PROCEDURE FOR BLOWER
MOTOR"AT C - 9 5 , "DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR" .
If OK, continue with next check.
CHECKING DISCHARGE AIR
1. Press MODE switch four times and the DEF ( ) switch.
2. Each position indicator should change shape (on display).
3. Confirm that discharge air comes out according to the air distribution table. Refer to AT C - 3 0 , "
Discharge
Air Flow" .
Mode door position is checked in the next step.
If NG, go to trouble diagnosis procedure for AT C - 6 4 , "
Mode Door Motor Circuit" .
If OK, continue the check.
NOTE:
Confirm that the compressor clutch is engaged (sound or visual inspection) and intake door position is at fresh
when the DEF or D/F is selected.
CHECKING RECIRCULATION (, ONLY)
1. Press recirculation ( ) switch one time. Recirculation indicator should illuminate.
2. Press recirculation ( ) switch one more time. Recirculation indicator should go off.
3. Listen for intake door position change (blower sound should change slightly).
If NG, go to trouble diagnosis procedure for AT C - 8 3 , "
Intake Door Motor Circuit" .
If OK, continue the check.
NOTE:
Confirm that the compressor clutch is engaged (sound or visual inspection) and intake door position is at fresh
when the DEF or D/F is selected. REC ( ) is not allowed in DEF ( ) D/F ( ) or FOOT ( ).
CHECKING TEMPERATURE DECREASE
1. Rotate temperature control dial (driver side or passenger side) counterclockwise until 16 °C (60 °F) is dis-
played.
2. Check for cold air at appropriate discharge air outlets.
If NG, listen for sound of air mix door motor operation. If OK, go to trouble diagnosis procedure for ATC-121,
"Insufficient Cooling" . If air mix door motor appears to be malfunctioning, go to AT C - 7 2 , "DIAGNOSTIC PRO-
CEDURE FOR AIR MIX DOOR MOTOR (DRIVER)" or AT C - 7 6 , "DIAGNOSTIC PROCEDURE FOR AIR MIX
DOOR MOTOR (PASSENGER)" .
If OK, continue the check. Conditions : Engine running and at normal operating temperature

TROUBLE DIAGNOSISATC-63
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1. CHECK POWER SUPPLY CIRCUITS FOR FRONT AIR CONTROL
1. Disconnect front air control connector.
2. Check voltage between front air control harness connector M49 terminals 14 and 22, and ground.
OK or NG
OK >> GO TO 2.
NG >> Check 10A fuses [Nos. 8 and 19, located in the fuse block (J/B)]. Refer to PG-76, "
FUSE BLOCK-
JUNCTION BOX (J/B)" .

If fuses are OK, check harness for open circuit. Repair or replace as necessary.

If fuses are NG, replace fuse and check harness for short circuit. Repair or replace as neces-
sary.
2. CHECK GROUND CIRCUIT FOR FRONT AIR CONTROL
1. Turn ignition switch OFF.
2. Check continuity between front air control harness connector M49 terminal 1 and ground.
OK or NG
OK >> Replace front air control. Refer to ATC-144, "FRONT
AIR CONTROL" .
NG >> Repair harness or connector.
Terminals Ignition switch position
(+)
(-) OFF ACC ON
Front air
control
connector Terminal No.
M49 14 GroundApprox. 0V Approx. 0V
Battery
voltage
M49 22 Battery
voltage Battery
voltage Battery
voltage
WJIA0415E
1 - Ground : Continuity should exist.
WJIA1351E

ATC-66
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
COMPONENT DESCRIPTION
Mode Door Motor
The mode door motor is attached to the heater & cooling unit. It
rotates so that air is discharged from the outlet as indicated by the
front air control. Motor rotation is conveyed to a link which activates
the mode door.
DIAGNOSTIC PROCEDURE FOR MODE DOOR MOTOR
1. CHECK FRONT AIR CONTROL FOR POWER AND GROUND
1. Turn ignition switch ON.
2. Press the mode switch to the B/L ( ) mode.
3. Check voltage between front air control harness connector M49 terminal 5 and terminal 6 while pressing the mode switch to the
floor ( ) mode.
OK or NG
OK >> GO TO 3.
NG >> GO TO 2.
2. CHECK MODE DOOR MOTOR CIRCUITS FOR SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect the front air control harness connector.
3. Check continuity between front air control harness connector M49 terminal 5, 6 and ground.
OK or NG
OK >> Replace front air control. Refer to ATC-144, "FRONT
AIR CONTROL" .
NG >> Repair or replace harness as necessary.
WJIA0587E
Connector Terminals
Condition Voltage
(Approx.)
(+) (-)
Front air control: M49 6 5 Press
mode
switch Battery
voltage
WJIA1727E
5 - Ground : Continuity should not exist.
6 - Ground : Continuity should not exist.
WJIA1734E

TROUBLE DIAGNOSISATC-67
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3. CHECK FRONT AIR CONTROL FOR GROUND AND POWER
1. Press the mode switch to the D/F ( ) mode.
2. Check voltage between front air control harness connector M49 terminal 5 and terminal 6 while pressing the mode switch to the
vent ( ) mode.
OK or NG
OK >> GO TO 4.
NG >> Replace front air control. Refer to ATC-144, "
FRONT AIR CONTROL" .
4. CHECK MODE DOOR MOTOR AND CIRCUITS FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect the front air control harness connector.
3. Check continuity between front air control harness connector M49 terminal 5 and terminal 6.
OK or NG
OK >> GO TO 6.
NG >> GO TO 5.
5. CHECK MODE DOOR MOTOR CIRCUITS FOR OPEN
1. Disconnect the mode door motor harness connector.
2. Check continuity between front air control harness connector M49 terminal 5, 6 and the mode door motor harness connector
terminal 5, 6.
OK or NG
OK >> Replace mode door motor. Refer to ATC-161, "Removal
and Installation" .
NG >> Repair or replace harness as necessary.
6. CHECK FRONT AIR CONTROL FOR PBR POWER AND GROUND
1. Reconnect front air control harness connector.
2. Turn ignition switch ON.
3. Check voltage between front air control harness connector M49 terminal 2 and terminal 15.
OK or NG
OK >> GO TO 8.
NG >> GO TO 7.
Connector Terminals
Condition Voltage
(Approx.)
(+) (-)
Front air control: M49 5 6 Press
mode
switch Battery
voltage
WJIA1742E
Continuity should exist.
WJIA1728E
5 - 5 : Continuity should exist.
6 - 6 : Continuity should exist.
LJIA0027E
Connector Te r m i n a l s
Voltage
(Approx.)
(+) (-)
Front air control: M49 2 15 5V
WJIA1729E

ATC-68
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
7. CHECK PBR REFERENCE VOLTAGE CIRCUIT FOR SHORT TO GROUND
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 ground.
OK or NG
OK >> Replace front air control. Refer to ATC-144, "FRONT
AIR CONTROL" .
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 VOLTAGE 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-161, "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. 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