Nissan Murano Z51. Manual - part 855

A/C CONTROL SIGNAL CIRCUIT

HAC-75

< DTC/CIRCUIT DIAGNOSIS >

[WITHOUT 7 INCH DISPLAY]

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A/C CONTROL SIGNAL CIRCUIT

Diagnosis Procedure

INFOID:0000000005514640

1.

CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT-III

1.

Using CONSULT-III, perform “SELF-DIAGNOSIS RESULTS” of HVAC. 

2.

Check if any DTC No. is displayed in the self-diagnosis results. 

NOTE:
If DTC is displayed along with DTC U1000 or U1010, first diagnose the DTC U1000 or U1010. Refer to 

HAC-

43, "DTC Logic"

 or 

HAC-44, "DTC Logic"

. 

Is any DTC No. displayed?

YES

>> Perform the diagnosis that is applicable to the sensor and actuator. Refer to 

HAC-106, "DTC

Index"

. 

NO

>> GO TO 2.

2.

CHECK TX (A/C CONTROL 

→

 A/C AUTO AMP.) CIRCUIT CONTINUITY

1.

Disconnect the A/C control and the A/C auto amp. connector.

2.

Check continuity between A/C control harness connector and A/C auto amp. harness connector. 

3.

Check continuity between A/C control harness connector and ground. 

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK RX (A/C AUTO AMP. 

→

 A/C CONTROL) CIRCUIT CONTINUITY

1.

Disconnect the A/C control and the A/C auto amp. connector.

2.

Check continuity between A/C control harness connector and A/C auto amp. harness connector. 

3.

Check continuity between A/C control harness connector and ground. 

Is the inspection result normal?

YES

>> Perform trouble diagnosis for the A/C control. Refer to 

HAC-77, "A/C CONTROL : Diagnosis Pro-

cedure"

. 

NO

>> Repair harness or connector.

A/C control

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

M95

4

M50

7

 

Existed

A/C control

—

Continuity

Connector

Terminal

M95

4

Ground

 Not existed

A/C control

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

M95

3

M50

6

 

Existed

A/C control

—

Continuity

Connector

Terminal

M95

3

Ground

 Not existed

HAC-76

< DTC/CIRCUIT DIAGNOSIS >

[WITHOUT 7 INCH DISPLAY]

POWER SUPPLY AND GROUND CIRCUIT

POWER SUPPLY AND GROUND CIRCUIT

A/C AUTO AMP.

A/C AUTO AMP. : Description

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COMPONENT DESCRIPTION

A/C Auto Amp. (Air Conditioner Automatic Amplifier)

The A/C auto amp. (1) has a built-in microcomputer that processes
information sent from various sensors needed for air conditioner
operation. The air mix door motor(s), the mode door motor, the
intake door motor, the upper ventilator door motor, the blower motor
and the compressor are then controlled.
When the various switches and temperature control switch are oper-
ated, data is input to the A/C auto amp. from the A/C control.

Power Supply and Ground Circuit for A/C Auto Amp.

A/C AUTO AMP. : Component Function Check

INFOID:0000000005514642

1.

CHECK OPERATION

1.

Press the AUTO switch, and then check that “AUTO” is shown on the display. 

2.

Operate the temperature control switch (driver side). Check that the fan speed or outlet changes.  (The
discharge air temperature or fan speed varies depending on the ambient temperature, in-vehicle tempera-
ture, and temperature setting.) 

Does it operate normally?

YES

>> INSPECTION END

NO

>> Perform trouble diagnosis for the A/C system. Refer to 

HAC-76, "A/C AUTO AMP. : Diagnosis

Procedure"

.  

A/C AUTO AMP. : Diagnosis Procedure

INFOID:0000000005514643

1.

CHECK A/C AUTO AMP. POWER SUPPLY CIRCUIT

1.

Disconnect the A/C auto amp. connector. 

2.

Check voltage between A/C auto amp. harness connector and ground. 

JPIIA0609ZZ

JPIIA0617GB

POWER SUPPLY AND GROUND CIRCUIT

HAC-77

< DTC/CIRCUIT DIAGNOSIS >

[WITHOUT 7 INCH DISPLAY]

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Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK FUSE

Check 10A fuses [Nos. 3, 6 and 19, located in the fuse block (J/B)].
NOTE:
Refer to 

PG-113, "Fuse, Connector and Terminal Arrangement"

.

Is the inspection result normal?

YES

>> Repair the harnesses or connectors.

NO

>> Replace the fuse after repairing the applicable circuit. 

3.

CHECK A/C AUTO AMP. CIRCUIT CONTINUITY

1.

Turn ignition switch OFF.

2.

Check continuity between A/C auto amp. harness connector and ground. 

Is the inspection result normal?

YES

>> Replace the A/C auto amp. 

NO

>> Repair the harnesses or connectors.

A/C CONTROL

A/C CONTROL : Diagnosis Procedure

INFOID:0000000005514644

1.

CHECK A/C CONTROL POWER SUPPLY CIRCUIT

1.

Disconnect the A/C control connector. 

2.

Turn ignition switch ON.

3.

Check voltage between A/C control harness connector and ground. 

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair the harnesses or connectors.

2.

CHECK A/C CONTROL CIRCUIT CONTINUITY

1.

Turn ignition switch OFF.

2.

Check continuity between A/C control harness connector and ground. 

(+)

(

−

)

Voltage

A/C auto amp.

—

Ignition switch position

Connector

Terminal

OFF

ACC

ON

M50

17

Ground

Approx. 0 V

Battery voltage

Battery voltage

20

Approx. 0 V

Approx. 0 V

Battery voltage

40

Battery voltage

Battery voltage

Battery voltage

A/C auto amp.

—

Continuity

Connector

Terminal

M50

19

Ground

Existed

39

(+)

(

−

)

Voltage

A/C control

—

Connector

Terminal

M95

1

Ground

Battery voltage

HAC-78

< DTC/CIRCUIT DIAGNOSIS >

[WITHOUT 7 INCH DISPLAY]

POWER SUPPLY AND GROUND CIRCUIT

Is the inspection result normal?

YES

>> Replace the A/C control. 

NO

>> Repair the harnesses or connectors.

A/C DISPLAY

A/C DISPLAY : Diagnosis Procedure

INFOID:0000000005514645

1.

CHECK A/C DISPLAY POWER SUPPLY CIRCUIT

1.

Disconnect the A/C display connector. 

2.

Turn ignition switch ON.

3.

Check voltage between A/C display harness connector and ground. 

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair the harnesses or connectors.

2.

CHECK A/C DISPLAY CIRCUIT CONTINUITY

1.

Turn ignition switch OFF.

2.

Check continuity between A/C display harness connector and ground. 

Is the inspection result normal?

YES

>> Replace the A/C display. 

NO

>> Repair the harnesses or connectors.

A/C control

—

Continuity

Connector

Terminal

M95

2

Ground

Existed

(+)

(

−

)

Voltage

A/C display

—

Connector

Terminal

M16

6

Ground

Battery voltage

A/C display

—

Continuity

Connector

Terminal

M16

1

Ground

Existed