INFINITI M35 2006 Factory Service Manual

ATC-64
TROUBLE DIAGNOSIS
Revision: 2006 January2006 M35/M45
Operational CheckNJS000GK
The purpose of the operational check is to check if the individual system operates properly.
CHECKING MEMORY FUNCTION
1. Press the temperature control (UP) switch (driver side) until 32C (90F) is displayed.
2. Press OFF switch.
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. Press OFF switch.
If NG, go to trouble diagnosis procedure for ATC-112, "
Memory Function" .
If OK, continue the check.
CHECKING BLOWER
1. Press fan (UP:+) switch. Blower should operate on low speed. The fan symbol should have one blade lit.
2. Press fan (UP:+) switch again, and continue checking blower speed and fan symbol until all speeds are
checked.
3. Leave blower on max. speed.
If NG, go to trouble diagnosis procedure for ATC-89, "
Blower Motor Circuit" .
If OK, continue the check.
CHECKING DISCHARGE AIR (MODE SWITCH AND DEF SWITCH)
1. Press MODE switch and DEF switch.
2. Each position indicator should change shape.
3. Confirm that discharge air comes out according to the air distribution table. Refer to AT C - 3 7 , "
Discharge
Air Flow" .
If NG, go to trouble diagnosis procedure for ATC-75, "
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 D/F or DEF is selected.Conditions : Engine running at normal operating temperature
RJIA4035E

TROUBLE DIAGNOSIS
ATC-65
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AT C
Revision: 2006 January2006 M35/M45
CHECKING DISCHARGE AIR (UPPER VENT SWITCH)
1. Press temperature control (DOWN) switch (driver side) until 18C (60F) is displayed.
2. Press fan (UP:+) switch until Max. speed.
3. Set MODE switch (driver side) to VENT position.
4. Press UPPER VENT switch.
AUTO indicator should illuminate.
5. Press temperature control (UP) switch (driver side) until 32
C (90F) is displayed.
6. Conform that discharger come out.
7. Press UPPER VENT switch again.
AUTO indicator should OFF.
If NG, go to trouble diagnosis procedure for ATC-80, "
Upper Ventilator Door Motor Circuit" .
If OK, continue the check.
CHECKING INTAKE AIR
1. Press intake switch. Recirculation indicator should illuminate.
2. Press intake switch again. Fresh indicator should illuminate.
3. Listen for intake door position change. (Slight change of blower sound can be heard.)
If NG, go to trouble diagnosis procedure for ATC-86, "
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 D/F or DEF is selected.
CHECKING TEMPERATURE DECREASE
1. Press temperature control (DOWN) switch (driver side) until 18C (60F) is displayed.
2. Check for cold air at discharge air outlets.
If NG, go to trouble diagnosis procedure for ATC-99, "
Insufficient Cooling" .
If OK, continue the check.
CHECKING TEMPERATURE INCREASE
1. Press temperature control (UP) switch (driver side) until 32C (90F) is displayed.
2. Check for hot air at discharge air outlets.
If NG, go to trouble diagnosis procedure for ATC-109, "
Insufficient Heating" .
If OK, continue the check.
CHECKING A/C SWITCH
1. Press AUTO switch and A/C switch.
2. A/C switch indicator will turn ON.
Confirm that the compressor clutch engages (sound or visual inspection).
CHECKING AUTO MODE
1. Press AUTO switch and A/C switch.
2. Display should indicate AUTO.
Discharge air and blower speed will depend on ambient, in-vehicle, and set temperatures.
If NG, go to trouble diagnosis procedure for AT C - 6 6 , "
Power Supply and Ground Circuit for Auto Amp." , then
if necessary, trouble diagnosis procedure for AT C - 9 4 , "
Magnet Clutch Circuit" .
If all operational checks are OK (symptom cannot be duplicated), go to Incident Simulation Tests in GI-28,
"How to Perform Efficient Diagnosis for an Electrical Incident" and perform tests as outlined to simulate driv-
ing conditions environment. If symptom appears, refer to AT C - 4 1 , "
SYMPTOM TABLE" and perform applica-
ble trouble diagnosis procedures.

ATC-66
TROUBLE DIAGNOSIS
Revision: 2006 January2006 M35/M45
Power Supply and Ground Circuit for Auto Amp.NJS000GL
SYMPTOM: A/C system does not come on.
INSPECTION FLOW
*1ATC-67, "DIAGNOSIS PROCE-
DURE FOR A/C SYSTEM"
*2ATC-64, "Operational Check"*3AV-108, "Multifunction Switch Can-
not Be Operated" (Without mobile
entertainment system) or AV-253,
"Multifunction Switch Cannot Be
Operated" (With mobile entertain-
ment system)
RJIA4047E

TROUBLE DIAGNOSIS
ATC-67
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AT C
Revision: 2006 January2006 M35/M45
COMPONENT DESCRIPTION
Unified Meter and A/C Amp. (Automatic Amplifier)
The unified meter and A/C amp. has a built-in microcomputer which
processes information sent from various sensors needed for air con-
ditioner operation. The air mix door motor, mode door motor, upper
ventilator door motor, intake door motor, blower motor and compres-
sor are then controlled.
When the various switches and temperature control switch are oper-
ated, data is input to the unified meter and A/C amp. from the AV
control unit / NAVI control unit using CAN communication.
Self-diagnosis functions are also built into unified meter and A/C
amp. to provide quick check of malfunctions in the auto air condi-
tioner system.
Potentio Temperature Control (PTC)
The PTC is built into the multifunction switch. It can be set at an
interval of 0.5
C (1.0F) in the 18C (60F) to 32C (90F) tempera-
ture range by pressing temperature control switch. The set tempera-
ture is displayed.
DIAGNOSIS PROCEDURE FOR A/C SYSTEM
SYMPTOM: A/C system does not come on.
RJIA4032E
RJIA4048E
RJIA4049E

ATC-68
TROUBLE DIAGNOSIS
Revision: 2006 January2006 M35/M45
1. CHECK POWER SUPPLY CIRCUIT FOR UNIFIED METER AND A/C AMP.
1. Disconnect unified meter and A/C amp. connector.
2. Check voltage between unified meter and A/C amp. harness
connector M65 terminals 41, 53 and 55 and ground.
OK or NG
OK >> GO TO 2.
NG >> Check 10A fuses [Nos. 6, 12 and 19, located in the fuse block (J/B)]. Refer to P G - 111 , "
FUSE
BLOCK - JUNCTION BOX (J/B)" .
If fuses are OK, check harness for open circuit. Repair or replace if necessary.
If fuses are NG, check harness for short circuit and replace fuse.
2. CHECK GROUND CIRCUIT FOR UNIFIED METER AND A/C AMP.
1. Turn ignition switch OFF.
2. Check continuity between unified meter and A/C amp. harness
connector M65 terminal 55, 71 and ground.
OK or NG
OK >> Replace unified meter and A/C amp.
NG >> Repair harness or connector.
Terminals Ignition switch position
(+)
(-) OFF ACC ON Unified
meter and
A/C amp.
connectorTerminal
No.
M65 41
GroundApprox. 0 VBattery
voltageBattery
voltage
M65 53 Approx. 0 V Approx. 0 VBattery
voltage
M65 54Battery
voltageBattery
voltageBattery
voltage
RJIA4050E
55, 71 – Ground : Continuity should exist.
RJIA4051E

TROUBLE DIAGNOSIS
ATC-69
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AT C
Revision: 2006 January2006 M35/M45
Rear Control Switch CircuitNJS000GM
DIAGNOSIS PROCEDURE FOR REAR CONTROL SWITCH
SYMPTOM: Rear control switch does not operate.
1. CHECK A/C SYSTEM
Check multifunction switch, confirm A/C system operation.
OK or NG
OK >> GO TO 2.
NG >> Go to trouble diagnosis procedure for A/C system. Refer to AT C - 6 6 , "
Power Supply and Ground
Circuit for Auto Amp." .
2. CHECK REAR CONTROL SWITCH
Check rear control switch, except for A/C switch (audio) operation.
OK or NG
OK >> GO TO 5.
NG >> GO TO 3.
3. CHECK POWER SUPPLY FOR REAR CONTROL SWITCH
1. Turn ignition switch OFF.
2. Disconnect rear control switch connector.
3. Turn ignition switch ACC.
4. Check voltage between rear control switch harness connector
B554 terminal 1 and ground.
OK or NG
OK >> GO TO 4.
NG >> Check 10A fuse [No. 6 located in the fuse block (J/B)].
Refer to P G - 111 , "
FUSE BLOCK - JUNCTION BOX (J/
B)" .
If fuse is OK, check harness for open circuit. Repair or replace if necessary.
If fuse is NG, check harness for short circuit and replace fuse.
4. CHECK GROUND CIRCUIT FOR REAR CONTROL SWITCH
1. Turn ignition switch OFF.
2. Check continuity between rear control switch harness connector
B554 terminal 4 and ground.
OK or NG
OK >> GO TO 5.
NG >> Repair harness or connector.
5. CHECK REAR CONTROL SWITCH, AV CONTROL UNIT OR NAVI CONTROL UNIT
Check circuit between rear control switch and AV control unit or NAVI control unit AV- 1 0 8 , "
TROUBLE DIAG-
NOSIS" (Without mobile entertainment system) or AV- 2 5 3 , "TROUBLE DIAGNOSIS" (With mobile entertain-
ment system).
OK or NG
OK >> Replace rear control switch.
NG >> Replace part or repair for result trouble diagnosis.1 – Ground : Battery voltage
RJIA3996E
4 – Ground : Continuity should exist.
RJIA3997E

ATC-70
TROUBLE DIAGNOSIS
Revision: 2006 January2006 M35/M45
LAN System CircuitNJS000GN
SYMPTOM: Mode door motors, upper ventilator door motor, air mix door motors and intake door motor does
not operate normally.
DIAGNOSIS PROCEDURE FOR LAN CIRCUIT
1. CHECK POWER SUPPLY FOR UNIFIED METER AND A/C AMP.
1. Turn ignition switch ON.
2. Check voltage between unified meter and A/C amp. harness
connector M65 terminal 70 and ground.
OK or NG
OK >> GO TO 2.
NG >> Replace unified meter and A/C amp.
2. CHECK SIGNAL FOR UNIFIED METER AND A/C AMP.
Confirm A/C LAN signal between unified meter and A/C amp. har-
ness connector M65 terminal 69 and ground using an oscilloscope.
OK or NG
OK >> GO TO 3.
NG >> Replace unified meter and A/C amp.
RJIA4052E
70 – Ground : Battery voltage
RJIA4053E
Terminals
Voltage (+)
(
)
Unified meter and
A/C amp. connectorTe r m i n a l N o .
M65 69 Ground
RJIA4054E
SJIA1453J

TROUBLE DIAGNOSIS
ATC-71
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AT C
Revision: 2006 January2006 M35/M45
3. CHECK POWER SUPPLY FOR EACH DOOR MOTOR
Check voltage between each door motor harness connector terminal
1 and ground.
OK or NG
OK >> GO TO 4.
NG >> Repair harness or connector.
4. CHECK SIGNAL FOR EACH DOOR MOTOR
Confirm A/C LAN signal between each door motor harness connec-
tor terminal 3 and ground using an oscilloscope.
OK or NG
OK >> GO TO 5.
NG >> Repair harness or connector.
5. CHECK MOTOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect each door motor connector.
3. Check continuity between each door motor harness connector
terminal 2 and ground.
OK or NG
OK >> GO TO 6.
NG >> Repair harness or connector.1 – Ground : Battery voltage
RJIA1988E
Door motorTerminals
Voltag e (+)
()
Con-
nectorTerminal
No.
Mode (Driver
side)M252 3
Ground Mode (Pas-
senger side)M255 3
Upper venti-
latorM254 3
Air mix
(Driver side)M253 3
Air mix (Pas-
senger side)M256 3
Intake M257 3
RJIA1989E
SJIA1453J
2 – Ground : Continuity should exist.
RJIA1990E

ATC-72
TROUBLE DIAGNOSIS
Revision: 2006 January2006 M35/M45
6. CHECK MOTOR OPERATION
1. Reconnect each door motor connector.
2. Turn ignition switch ON.
3. Confirm operation of each door motor.
OK or NG
OK >> (Return to operate normally.)
Poor contact in motor connector.
NG >> (Does not operate normally.)
GO TO 7.
7. CHECK UPPER VENTILATOR DOOR MOTOR, AIR MIX DOOR MOTOR AND INTAKE DOOR MOTOR
OPERATION
1. Turn ignition switch OFF.
2. Disconnect mode (driver side, passenger side), upper ventilator, air mix (driver side, passenger side), and
intake door motor connectors.
3. Reconnect upper ventilator, air mix (driver side, passenger side) and intake door motor connectors.
4. Turn ignition switch ON.
5. Confirm operation of upper ventilator, air mix door motor (driver side, passenger side) and intake door
motor.
OK or NG
OK >> [Upper ventilator, air mix (driver side, passenger side) and intake door motors operate normally.]
GO TO 11.
NG >> [Upper ventilator, air mix (driver side, passenger side) and intake door motors does not operate
normally.]
GO TO 8.
8. CHECK MODE DOOR MOTOR, AIR MIX DOOR MOTOR AND INTAKE DOOR MOTOR OPERATION
1. Turn ignition switch OFF.
2. Disconnect upper ventilator door motor connector.
3. Reconnect mode door motor (driver side, passenger side) connectors.
4. Turn ignition switch ON.
5. Confirm operation of mode door motor (driver side, passenger side), air mix door motor (driver side, pas-
senger side) and intake door motor.
OK or NG
OK >> [Mode (driver side, passenger side), air mix (driver side, passenger side) and intake door motors
operate normally.]
Replace upper ventilator door motor.
NG >> [Mode (driver side, passenger side), air mix (driver side, passenger side) and intake door motors
does not operate normally.]
GO TO 9.

TROUBLE DIAGNOSIS
ATC-73
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AT C
Revision: 2006 January2006 M35/M45
9. CHECK MODE DOOR MOTOR, UPPER VENTILATOR DOOR MOTOR AND INTAKE DOOR MOTOR
OPERATION
1. Turn ignition switch OFF.
2. Disconnect air mix door motor (driver side, passenger side) connectors.
3. Reconnect upper ventilator door motor connector.
4. Turn ignition switch ON.
5. Confirm operation of mode door motor (driver side, passenger side), upper ventilator door motor and
intake door motor.
OK or NG
OK >> [Mode (driver side, passenger side), upper ventilator and intake door motors operate normally.]
GO TO 12.
NG >> [Mode (driver side, passenger side), upper ventilator and intake door motors does not operate
normally.]
GO TO 10.
10. CHECK MODE DOOR MOTOR, UPPER VENTILATOR DOOR MOTOR AND AIR MIX DOOR MOTOR
OPERATION
1. Turn ignition switch OFF.
2. Disconnect intake door motor connector.
3. Reconnect air mix door motor (driver side, passenger side) connectors.
4. Turn ignition switch ON.
5. Confirm operation of mode door motor (driver side, passenger side), upper ventilator door motor and air
mix door motor (driver side, passenger side).
OK or NG
OK >> [Mode (driver side, passenger side), upper ventilator and air mix door motor (driver side, passen-
ger side) operate normally.]
Replace intake door motor.
NG >> [Mode (driver side, passenger side), upper ventilator and air mix door motor (driver side, passen-
ger side) does not operate normally.]
Replace unified meter and A/C amp.
11 . CHECK MODE DOOR MOTOR OPERATION
1. Turn ignition switch OFF.
2. Reconnect mode door motor (passenger side) connector.
3. Turn ignition switch ON.
4. Confirm operation of mode door motor (passenger side).
OK or NG
OK >> [Mode door motor (passenger side) operates normally.]
Replace mode door motor (driver side).
NG >> [Mode door motor (passenger side) does not operate normally.]
Replace mode door motor (passenger side).