Infiniti QX56 (Z62). Manual — part 809
REAR A/C CONTROL COMMUNICATION SIGNAL
HAC-127
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
REAR A/C CONTROL COMMUNICATION SIGNAL
Diagnosis Procedure
INFOID:0000000006275975
1.
CHECK COMMUNICATION SIGNAL CIRCUIT (A/C AUTO AMP.
→
REAR A/C CONTROL) FOR OPEN
1.
Turn ignition switch OFF.
2.
Disconnect rear A/C control and A/C auto amp. connector.
3.
Check continuity between rear A/C control harness connector and A/C auto amp. harness connector.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair harness or connector.
2.
CHECK COMMUNICATION SIGNAL CIRCUIT (A/C AUTO AMP.
→
REAR A/C CONTROL) FOR SHORT
Check continuity between rear A/C control harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair harness or connector.
3.
CHECK COMMUNICATION SIGNAL CIRCUIT (REAR A/C CONTROL
→
A/C AUTO AMP.) CIRCUIT FOR
OPEN
Check continuity between rear A/C control harness connector and A/C auto amp. harness connector.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair harness or connector.
4.
CHECK COMMUNICATION SIGNAL CIRCUIT (REAR A/C CONTROL
→
A/C AUTO AMP.) CIRCUIT FOR
SHORT
Check continuity between rear A/C control harness connector and ground.
Is the inspection result normal?
YES
>> Replace A/C auto amp.. Refer to
HAC-146, "Removal and Installation"
NO
>> Repair harness or connector.
Rear A/C control
A/C auto amp.
Continuity
Connector
Terminal
Connector
Terminal
M41
9
M50
11
Existed
Rear A/C control
—
Continuity
Connector
Terminal
M41
9
Ground
Not existed
Rear A/C control
A/C auto amp.
Continuity
Connector
Terminal
Connector
Terminal
M41
10
M50
31
Existed
Rear A/C control
—
Continuity
Connector
Terminal
M41
10
Ground
Not existed
HAC-128
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
REAR A/C SOLENOID VALVE
REAR A/C SOLENOID VALVE
Diagnosis Procedure
INFOID:0000000006275976
1.
CHECK FUSE
1.
Turn ignition switch OFF.
2.
Check 10A fuse [No.4, located in fuse block (J/B)].
NOTE:
Refer to
PG-140, "Fuse, Connector and Terminal Arrangement"
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Replace the blown fuse after repairing the affected circuit if a fuse is blown.
2.
CHECK REAR A/C SOLENOID VALVE POWER SUPPLY
1.
Disconnect rear A/C solenoid valve connector.
2.
Turn ignition switch ON and front air conditioning system ON.
3.
Check voltage between rear A/C solenoid valve harness connector and ground when rear blower motor is
operated.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 4.
3.
CHECK REAR A/C SOLENOID VALVE GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Check continuity between rear A/C solenoid valve harness connector and ground.
Is the inspection result normal?
YES
>> Replace rear expansion valve assembly. Refer to
HA-49, "EXPANSION VALVE : Removal and
NO
>> Repair harness or connector.
4.
CHECK REAR A/C RELAY POWER SUPPLY
1.
Turn ignition switch OFF.
2.
Disconnect rear A/C relay connector.
3.
Turn ignition switch ON.
4.
Check voltage between rear A/C relay harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 5.
+
−
Condition
Voltage
(Approx.)
Rear A/C solenoid valve
Connector
Terminal
B207
1
Ground
Rear blower motor
ON
Battery voltage
OFF
0 V
Rear A/C solenoid valve
—
Continuity
Connector
Terminal
B207
2
Ground
Existed
+
−
Voltage
(Approx.)
Rear A/C relay
Connector
Terminal
E87
1
Ground
Battery voltage
3
REAR A/C SOLENOID VALVE
HAC-129
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
NO
>> Repair harness or connector between rear A/C relay and fuse block (J/B).
5.
CHECK REAR A/C RERAY CONTROL CIRCUIT FOR OPEN
1.
Turn ignition switch OFF.
2.
Disconnect A/C auto amp. connector.
3.
Check continuity between rear A/C relay harness connector and A/C auto amp. harness connector.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair harness or connector.
6.
CHECK REAR A/C RELAY CONTROL CIRCUIT FOR SHORT
Check continuity between rear A/C relay harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Repair harness or connector.
7.
CHECK REAR A/C SOLENOID VALVE POWER SUPPLY CIRCUIT
Check continuity between rear A/C relay harness connector and rear A/C solenoid valve harness connector.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Repair harness or connector.
8.
CHECK REAR A/C RELAY
Check rear A/C relay. Refer to
HAC-129, "Component Inspection"
.
Is the inspection result normal?
YES
>> Replace A/C auto amp.. Refer to
HAC-146, "Removal and Installation"
NO
>> Replace rear A/C relay.
Component Inspection
INFOID:0000000006275977
1.
CHECK REAR A/C RELAY
1.
Remove rear A/C relay.
Rear A/C relay
A/C auto amp.
Continuity
Connector
Terminal
Connector
Terminal
E87
2
M50
38
Existed
Rear A/C relay
—
Continuity
Connector
Terminal
E87
2
Ground
Not existed
Rear A/C relay
Rear A/C solenoid valve
Continuity
Connector
Terminal
Connector
Terminal
E87
5
B207
1
Existed
HAC-130
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
REAR A/C SOLENOID VALVE
2.
Check continuity between the rear A/C relay terminal 3 and 5
when the voltage is supplied between terminal 1 and 2.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace rear A/C relay.
Blower relay
Voltage
Continuity
Terminal
3
5
ON
Existed
OFF
Not existed
JSIIA1551ZZ
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