Nissan Qashqai J11. Manual - part 1159

HAC-272

< BASIC INSPECTION >

[MANUAL HEATER ]

DOOR MOTOR STARTING POSITION RESET

DOOR MOTOR STARTING POSITION RESET

Description

INFOID:0000000010433431

• Step motors are used for the mode door motor air mix door motor, and intake door motor.
• Because the step motors do not have position detection mechanisms, there may be a deviation between the

door position recognized by A/C amp. and the actual door position.
Therefore, A/C amp. performs motor zero position reset for aligning its recognized door position with the
actual door position.

• The reset signal is transmitted from A/C amp. to the air mix door motor, mode door motor, and intake door

motor, which then perform zero position reset.

• After any of the following conditions is met, A/C amp. performs motor zero position reset when the ignition

switch is next turned ON.

- The ignition switch is turned from ON to OFF a total of 360 times.
- The ignition switch turns OFF while the mode door motor, air mix door motor, or intake door motor is operat-

ing.

• If A/C amp., air mix door motor, mode door motor, or intake door motor is removed, it is necessary to perform

motor zero position reset using CONSULT.

Work Procedure

INFOID:0000000010433432

1.

PERFORM DOOR MOTOR STARTING POSITION RESET

With CONSULT

1.

Turn ignition switch ON.

2.

Select “Door Motor Starting Position Reset” in “WORK SUPPORT” mode of “HVAC” using CONSULT.

3.

Touch “Start” and wait 10 seconds.

4.

Make sure the “COMPLETED” is displayed on CONSULT screen.

>> INSPECTION END

U1000 CAN COMM CIRCUIT

HAC-273

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL HEATER ]

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DTC/CIRCUIT DIAGNOSIS

U1000 CAN COMM CIRCUIT

Description

INFOID:0000000010433433

CAN (Controller Area Network) is a serial communication line for real time applications. It is an on-board mul-
tiplex communication line with high data communication speed and excellent error detection ability. A modern
vehicle is equipped with many ECMs, and each control unit shares information and links with other control
units during operation (not independent). In CAN communication, 2 control units are connected with 2 commu-
nication lines (CAN-L line and CAN-H line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only. 
Refer to 

LAN-56, "CAN COMMUNICATION SYSTEM : CAN Communication Signal Chart"

 for details of the

communication signal. 

DTC Logic

INFOID:0000000010433434

DTC DETECTION LOGIC

POSSIBLE CAUSE

CAN communication system

FAIL-SAFE

—

DTC CONFIRMATION PROCEDURE

1.

PERFORM SELF-DIAGNOSIS

With CONSULT

1.

Turn ignition switch ON and wait for 2 seconds or more. 

2.

Select “Self Diagnostic Result” mode of “HVAC” using CONSULT. 

3.

Check DTC.

Is DTC detected?

YES

>> Refer to 

HAC-273, "Diagnosis Procedure"

. 

NO-1

>> To check malfunction symptom before repair: Refer to 

GI-44, "Intermittent Incident"

.

NO-2

>> Confirmation after repair: INSPECTION END

Diagnosis Procedure

INFOID:0000000010433435

1.

CHECK CAN COMMUNICATION SYSTEM

Check CAN communication system. Refer to 

LAN-28, "Trouble Diagnosis Flow Chart"

.

>> INSPECTION END

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

U1000

CAN COMM CIRCUIT
(CAN COMM CIRCUIT)

When A/C amp. is not transmitting or receiving CAN communication signal for 
2 seconds or more.

HAC-274

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL HEATER ]

U1010 CONTROL UNIT (CAN)

U1010 CONTROL UNIT (CAN)

Description

INFOID:0000000010433436

Initial diagnosis of A/C amp.

DTC Logic

INFOID:0000000010433437

DTC DETECTION LOGIC

POSSIBLE CAUSE

A/C amp. (CAN communication function malfunction)

FAIL-SAFE

—

DTC CONFIRMATION PROCEDURE

1.

PERFORM SELF-DIAGNOSIS

With CONSULT

1.

Turn ignition switch ON and wait for 2 seconds or more. 

2.

Select “Self Diagnostic Result” mode of “HVAC” using CONSULT. 

3.

Check DTC.

Is DTC detected?

YES

>> Refer to 

HAC-274, "Diagnosis Procedure"

. 

NO-1

>> To check malfunction symptom before repair: Refer to 

GI-44, "Intermittent Incident"

.

NO-2

>> Confirmation after repair: INSPECTION END

Diagnosis Procedure

INFOID:0000000010433438

1.

REPLACE A/C AMP.

Replace A/C amp. Refer to 

HAC-295, "Removal and Installation"

.

>> INSPECTION END

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

U1010

CONTROL UNIT(CAN)
[CONTROL UNIT(CAN)]

When detecting error during the initial diagnosis of CAN controller of A/C amp.

B24B7 INTAKE DOOR MOTOR

HAC-275

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL HEATER ]

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B24B7 INTAKE DOOR MOTOR

DTC Logic

INFOID:0000000010499410

DTC DETECTION LOGIC

POSSIBLE CAUSE

[CIRCUIT SHORT TO BATTERY]

• Harness and connector (Intake door motor circuit is shorted to battery)
• Intake door motor
• A/C amp.

[CIRC SHORT TO GRND OR OPEN]

• Harness and connector (Intake door motor circuit is open or shorted to ground)
• Intake door motor
• A/C amp.

FAIL-SAFE

—

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1.

Turn ignition switch ON.

2.

Select “Self Diagnostic Result” mode of “HVAC” using CONSULT.

3.

Check DTC.

Is DTC detected?

YES

>> Refer to 

HAC-275, "Diagnosis Procedure"

.

NO-1

>> To check malfunction symptom before repair: Refer to 

GI-44, "Intermittent Incident"

.

NO-2

>> Confirmation after repair: INSPECTION END

Diagnosis Procedure

INFOID:0000000010499411

1.

CHECK INTAKE DOOR MOTOR POWER SUPPLY

1.

Turn ignition switch OFF.

2.

Disconnect intake door motor connector.

3.

Turn ignition switch ON.

4.

Check voltage between intake door motor harness connector and ground for several seconds after press-
ing the INTAKE switch.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 2.

2.

CHECK INTAKE DOOR MOTOR POWER SUPPLY CIRCUIT FOR OPEN

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

B24B7

INTAKE DOOR MOTOR
(Intake door motor)

[CIRCUIT SHORT TO BATTERY]

Detect short to battery circuit of intake door motor cir-
cuits.

[CIRC SHORT TO GRND OR 
OPEN]

Detect open or short to ground circuit of intake door 
motor circuits.

+

−

Voltage

Intake door motor

Connector

Terminal

M386

2

Ground

11 - 14 V