Nissan Sentra. Manual - part 552

HAC-56

< BASIC INSPECTION >

[AUTOMATIC AIR CONDITIONER]

SYSTEM SETTING

Inlet Port Memory Function (REC)

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Description

• If the ignition switch is turned to the OFF position while the REC (

) switch is set to ON (recirculation),

“Perform the memory” or “Do not perform the memory” of the REC (

) switch ON (recirculation) condi-

tion can be selected. 

• If “Perform the memory” was set, the REC (

) switch will be ON (recirculation) when turning the ignition

switch to the ON position again. 

• If “Do not perform the memory” was set, the air inlets will be controlled automatically when turning the igni-

tion switch to the ON position again. 

How to set

Using CONSULT, perform “REC MEMORY SET” in “WORK SUPPORT” of HVAC. 

NOTE:
When the battery cable is disconnected from the negative terminal or when the battery voltage becomes 10V or less, the setting of the
REC switch memory function may be cancelled. 

Target Evaporator Temp Upper Limit

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DESCRIPTION

Set the target evaporator temperature upper limit. 

HOW TO SET

With CONSULT

Perform the “TARGET EVAPORATOR TEMP UPPER LIMIT SETTING” of HVAC work support item. 

Work support items

Display

Setting

REC MEMORY SET

WITHOUT (initial status)

Perform the memory of manual REC

WITH

Do not perform the memory of manual REC (auto 
control)

Work support items

Display

TARGET EVAPORATOR TEMP UPPER LIMIT 
SETTING

Initial Setting

Low

Middle

High

DOOR MOTOR STARTING POSITION RESET

HAC-57

< BASIC INSPECTION >

[AUTOMATIC AIR CONDITIONER]

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DOOR MOTOR STARTING POSITION RESET

Description

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• Reset signal is transmitted from A/C auto amp. to air mix door motor and mode door motor. Starting position

reset can be performed.

NOTE:

During reset, DEF switch indicator blinks.

• When air mix door motor or mode door motor is removed and installed, always perform door motor starting

position reset.

Work Procedure

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1.

PERFORM DOOR MOTOR STARTING POSITION RESET

With CONSULT

1. Turn ignition switch ON.

2. Select “Door Motor Starting Position Reset” in “ACTIVE TEST” mode of “HVAC” using CONSULT.

3. Touch “Start” and wait a few seconds.

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

>> Inspection End.

HAC-58

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

U1000 CAN COMM CIRCUIT

DTC/CIRCUIT DIAGNOSIS

U1000 CAN COMM CIRCUIT

Description

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CAN (Controller Area Network) is a serial communication system for real time application. It is an on-vehicle

multiplex communication system with high data communication speed and excellent error detection ability.

Many electronic control units are equipped onto vehicles, and each control unit shares information and links

with other control units during operation (not independent). In CAN communication, control units are con-

nected with two communication lines (CAN-H line, CAN-L 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-30, "CAN COMMUNICATION SYSTEM : CAN Communication Signal Chart"

.

DTC Logic

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DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM SELF-DIAGNOSIS

With CONSULT

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

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

3. Check if any DTC No. is displayed in the self-diagnosis results. 
Is DTC detected?

YES

>> Refer to 

HAC-58, "Diagnosis Procedure"

. 

NO

>> Refer to 

GI-39, "Intermittent Incident"

.

Diagnosis Procedure

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1.

CHECK CAN COMMUNICATION SYSTEM

Check CAN communication system. Refer to 

LAN-16, "Trouble Diagnosis Flow Chart"

.

>> Inspection End.

DTC

Items

 (CONSULT screen terms)

DTC detection condition

Possible cause

U1000

CAN COMM CIRCUIT

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

CAN communication system

U1010 CONTROL UNIT (CAN)

HAC-59

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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U1010 CONTROL UNIT (CAN)

Description

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Initial diagnosis of A/C auto amp.

DTC Logic

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DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM SELF-DIAGNOSIS

With CONSULT

1. Turn ignition switch ON. 

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

3. Check if any DTC No. is displayed in the self-diagnosis results. 
Is DTC detected?

YES

>> Refer to 

HAC-59, "Diagnosis Procedure"

.

NO

>> Inspection End. 

Diagnosis Procedure

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1.

REPLACE A/C AUTO AMP.

Replace A/C auto amp. Refer to 

HAC-105, "Removal and Installation"

.

>> Inspection End.

DTC

Items

 (CONSULT screen terms)

DTC detection condition

Possible cause

U1010

CONTROL UNIT (CAN)

When detecting error during the initial diag-
nosis of CAN controller of A/C auto amp.

A/C auto amp.