Infiniti QX56 (JA60). Manual — part 601
REAR AIR CONTROL SYSTEM
HAC-61
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connector.
3. Check continuity between A/C auto amp. harness connector
M50 terminal 49 and terminal 50.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
NO
>> GO TO 7.
7.
CHECK AIR MIX DOOR MOTOR (REAR) CIRCUITS FOR SHORT TO GROUND
Check continuity between A/C auto amp. harness connector M50
terminal 49, 50 and ground.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Repair or replace harness as necessary.
8.
CHECK AIR MIX DOOR MOTOR (REAR) CIRCUITS FOR OPEN
1. Disconnect the air mix door motor (rear) harness connector.
2. Check continuity between A/C auto amp. harness connector
M50 (A) terminal 49, 50 and the air mix door motor (rear) har-
ness connector B155 (B) terminal 1, 6.
Is the inspection result normal?
YES
>> Replace air mix door motor (rear). Refer to
.
NO
>> Repair or replace harness as necessary.
9.
CHECK A/C AUTO AMP. OWER AND GROUND FOR AIR MIX DOOR MOTOR (REAR)
1. Rotate temperature control dial (front) to maximum cold.
2. Check voltage between A/C auto amp. harness connector M50
terminal 49 and terminal 50 while rotating temperature control
dial (rear) to maximum heat.
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> Replace A/C auto amp. Refer to
VTL-7, "Removal and Installation"
.
10.
CHECK A/C AUTO AMP. FOR AIR MIX DOOR MOTOR (REAR) PBR POWER AND GROUND
Continuity should exist.
AWIIA0138ZZ
49 - Ground
: Continuity should not exist.
50 - Ground
: Continuity should not exist.
AWIIA0136ZZ
49 - 1
: Continuity should exist.
50 - 6
: Continuity should exist.
AWIIA0139ZZ
Connector
Terminals
Condition
Voltage
(Approx.)
(+) (-)
A/C auto amp.:
M50
50 49
Rotate temp
control dial
Battery
voltage
AWIIA0137ZZ
HAC-62
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
REAR AIR CONTROL SYSTEM
1. Check voltage between A/C auto amp. harness connector M50
(A) terminal 28 and M49 (B) terminal 3.
Is the inspection result normal?
YES
>> GO TO 14.
NO
>> GO TO 11.
11.
CHECK PBR REFERENCE VOLTAGE AND GROUND CIRCUITS
1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connector.
3. Check continuity between A/C auto amp. harness connector
M50 (A) terminal 28 and M49 (B) terminal 3.
Is the inspection result normal?
YES
>> GO TO 13.
NO
>> GO TO 12.
12.
CHECK PBR REFERENCE VOLTAGE CIRCUIT FOR OPEN
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 A/C auto amp. harness con-
nector M50 (A) terminal 28 and M49 (C) terminal 3.
Is the inspection result normal?
YES
>> Replace air mix door motor (rear). Refer to
.
NO
>> Repair or replace harness as necessary.
13.
CHECK PBR REFERENCE VOLTAGE CIRCUIT FOR SHORT TO GROUND
Check continuity between A/C auto amp. harness connector M50
terminal 28 and ground.
Is the inspection result normal?
YES
>> Replace A/C auto amp.
.
NO
>> Repair or replace harness as necessary.
14.
CHECK PBR FEEDBACK VOLTAGE
Connector
Terminals
Voltage (Ap-
prox.)
(+)
(-)
A/C auto amp.: M49, M50
28
3
5V
AWIIA0118ZZ
Continuity should exist.
AWIIA0120ZZ
28 - 3
: Continuity should exist.
3 - 2
: Continuity should exist.
AWIIA0121ZZ
Continuity should not exist.
AWIIA0119ZZ
REAR AIR CONTROL SYSTEM
HAC-63
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
Check voltage between A/C auto amp. harness connector M50 ter-
minal 33 and ground while rotating temperature control dial (rear)
from maximum cold to maximum heat.
Is the inspection result normal?
YES
>> System OK.
NO
>> GO TO 15.
15.
CHECK PBR FEEDBACK CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect the air mix door motor (rear) harness connector and
A/C auto amp. harness connector.
3. Check continuity between air mix door motor (rear) harness con-
nector B155 (B) terminal 4 and A/C auto amp. harness connec-
tor M50 (A) terminal 33.
Is the inspection result normal?
YES
>> GO TO 16.
NO
>> Repair or replace harness as necessary.
16.
CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR SHORT TO GROUND
Check continuity between A/C auto amp. harness connector M50
terminal 33 and ground.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
NO
>> Repair or replace harness as necessary.
Mode Door Motor (Rear) Diagnosis Procedure
INFOID:0000000005147712
Regarding Wiring Diagram information, refer to
DIAGNOSTIC PROCEDURE INOPERATIVE MODE DOOR MOTOR (REAR)
1.
CHECK REAR AIR CONTROL (FRONT) POWER SUPPLY
1. Disconnect rear air control (front) harness connector.
2. Turn ignition switch ON.
3. Check voltage between rear air control (front) harness connec-
tor R108 terminal 1 and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair harness or connector.
2.
CHECK REAR AIR CONTROL (FRONT) LIN BUS VOLTAGE
Voltage
: Approx. 1V - 4.5V
AWIIA0140ZZ
Continuity should exist.
AWIIA0142ZZ
Continuity should not exist.
AWIIA0141ZZ
Battery voltage should exist.
AWIIA0182ZZ
HAC-64
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
REAR AIR CONTROL SYSTEM
Check voltage between rear air control (front) harness connector
R108 terminal 5 and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 4.
3.
CHECK REAR AIR CONTROL (FRONT) GROUND CIRCUITS
1. Turn ignition switch OFF.
2. Check continuity between rear air control (front) harness con-
nector R108 terminal 6 and ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair harness or connector.
4.
CHECK LIN BUS VOLTAGE CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect the mode door motor (rear) harness connector.
3. Check continuity between rear air control (front) harness con-
nector R108 (B) terminal 5 and A/C auto amp. harness connec-
tor M50 (A) terminal 48.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
NO
>> Repair or replace harness as necessary.
5.
CHECK A/C AUTO AMP. POWER AND GROUND FOR MODE DOOR MOTOR (REAR)
1. Reconnect all disconnected parts.
2. Turn ignition switch ON.
3. Press the mode switch to the FLOOR (
) mode.
4. Check voltage between A/C auto amp. harness connector M50
terminal 43 and terminal 44 while pressing the mode switch to
the vent (
) mode.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> GO TO 6.
6.
CHECK MODE DOOR MOTOR AND CIRCUITS FOR OPEN
Battery voltage should exist.
AWIIA0183ZZ
Continuity should exist.
AWIIA0184ZZ
48 - 5
: Continuity should exist.
AWIIA0185ZZ
Connector
Terminals
Condition
Voltage
(Approx.)
(+) (-)
A/C auto amp.:
M50
43 44
Press
mode
switch
(rear)
Battery
voltage
AWIIA0189ZZ
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