Nissan Maxima. Manual - part 744

H

A

C

- 1

5

2

< DTC/CIRCUIT DIAGNOSIS >

[WITH MONOCHROME DISPLAY]

B2636, B2637, B2638, B2639, B2654, B2655 MODE DOOR MOTOR

B2636, B2637, B2638, B2639, B2654, B2655 MODE DOOR MOTOR

Description

INFOID:0000000010051155

COMPONENT DESCRIPTION

Mode Door Motor

• The mode door motor (1) is attached to the heater & cooling unit

assembly.

• It rotates so that air is discharged from the outlet set by the A/C

auto amp. Motor rotation is conveyed to a link which activates the

mode door.

DTC Logic

INFOID:0000000010051156

DTC DETECTION LOGIC

NOTE:

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

HAC-

133, "DTC Logic"

 or 

HAC-134, "DTC Logic"

. 

DTC CONFIRMATION PROCEDURE

1.

CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT

1. Using CONSULT, 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-

133, "DTC Logic"

 or 

HAC-134, "DTC Logic"

. 

Is DTC No.“B2636”, “B2637”, “B2638”, “B2639”, “B2654” or “B2655” displayed?

YES

>> Perform trouble diagnosis for the mode door motor. Refer to 

HAC-153, "Diagnosis Procedure"

. 

NO

>> GO TO 2.

2.

FUNCTION INSPECTION

1. Press MODE switch and DEF switch.

2. Each position indicator should change shape.

3. Confirm that air discharge comes out according to the air distribution table. Refer to 

HAC-114, "System

Description"

.

AWIIA0022ZZ

DTC

Items

 (CONSULT screen terms)

Diagnostic item is detected when...

Possible cause

B2636

DR VENT DOOR FAIL

When the malfunctioning door position is 
detected at VENT position

• Mode door motor
• A/C auto amp.
• Harness and connector

(CAN communication line is open 
or shorted)
(Mode door motor is open or short-
ed)

B2637

DR B/L DOOR FAIL

When the malfunctioning door position is 
detected at B/L position

B2638

DR D/F1 DOOR FAIL

When the malfunctioning door position is 
detected at FOOT position

B2639

DR DEF DOOR FAIL

When the malfunctioning door position is 
detected at DEF position

B2654

D/F2 DOOR FAIL

When the malfunctioning door position is 
detected at D/F position

B2655

B/L2 DOOR FAIL

When the malfunctioning door position is 
detected at B/L2 position

B2636, B2637, B2638, B2639, B2654, B2655 MODE DOOR MOTOR

HAC-153

< DTC/CIRCUIT DIAGNOSIS >

[WITH MONOCHROME DISPLAY]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

NOTE:

Confirm that the A/C compressor clutch is engaged (Sound or visual inspection) and intake door position is at
FRE (

) when DEF (

) or D/F (

) is selected.

Does it operate normally?

YES

>> Inspection End.

NO

>> Check mode door motor installation, and repair or replace the malfunctioning parts. Refer to 

HAC-

210, "MODE DOOR MOTOR : Removal and Installation"

.

Diagnosis Procedure

INFOID:0000000010051157

Regarding Wiring Diagram information, refer to 

HAC-173, "Wiring Diagram - With Monochrome Display"

.

1.

CHECK MODE DOOR MOTOR POWER SUPPLY

1. Turn ignition switch ON.

2. Check voltage between mode door motor harness connector

M127 terminal 1 and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair harness or connector.

2.

CHECK SIGNAL FOR MODE DOOR MOTOR

Confirm A/C LAN signal between mode door motor harness connec-

tor M127 terminal 3 and ground using an oscilloscope.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK MODE DOOR MOTOR GROUND CIRCUIT

1 - Ground

: Battery Voltage

AWIIA1148ZZ

(+)

(

−)

Voltage

Mode door motor

—

Connector

Terminal

M127

3

Ground

AWIIA1149ZZ

SJIA1453J

HAC-154

< DTC/CIRCUIT DIAGNOSIS >

[WITH MONOCHROME DISPLAY]

B2636, B2637, B2638, B2639, B2654, B2655 MODE DOOR MOTOR

1. Turn ignition switch OFF.

2. Disconnect mode door motor connector.

3. Check continuity between mode door motor harness connector

M127 terminal 2 and ground.

Is the inspection result normal?

YES

>> Replace mode door motor. Refer to 

HAC-210, "MODE

DOOR MOTOR : Removal and Installation"

.

NO

>> Repair harness or connector.

2 - Ground

: Continuity should exist.

AWIIA1150ZZ

B263D, B263E, B263F INTAKE DOOR MOTOR

HAC-155

< DTC/CIRCUIT DIAGNOSIS >

[WITH MONOCHROME DISPLAY]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

B263D, B263E, B263F INTAKE DOOR MOTOR

Description

INFOID:0000000010051158

COMPONENT DESCRIPTION

Intake Door Motor

• The intake door motor (1) is attached to the blower unit.

• It rotates so that air is drawn from inlets set by the A/C auto amp.

Motor rotation is conveyed to a lever which activates the intake

door.

DTC Logic

INFOID:0000000010051159

DTC DETECTION LOGIC

NOTE:

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

HAC-

133, "DTC Logic"

 or 

HAC-134, "DTC Logic"

. 

DTC CONFIRMATION PROCEDURE

1.

CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT

1. Using CONSULT, 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-

133, "DTC Logic"

 or 

HAC-134, "DTC Logic"

. 

Is DTC No.“B263D”, “B263E”, or “B263F” displayed?

YES

>> Perform trouble diagnosis for the intake door motor. Refer to 

HAC-156, "Diagnosis Procedure"

. 

NO

>> GO TO 2.

2.

FUNCTION INSPECTION

1. Press the REC (

) switch, indicator is turned ON. 

2. Listen for intake door position change. (Slight change of blower sound can be heard.)
3. Press the FRE (

) switch, indicator is turned ON. 

4. Listen for intake door position change. (Slight change of blower sound can be heard.)
Does it operate normally?

YES

>> Inspection End.

NO

>> Check intake door motor installation, and repair or replace the malfunctioning parts. Refer to 

HAC-

210, "INTAKE DOOR MOTOR : Removal and Installation"

.

ALIIA0340ZZ

DTC

Items

 (CONSULT screen terms)

Diagnostic item is detected when...

Possible cause

B263D

FRE DOOR FAIL

When the malfunctioning intake door posi-
tion is detected at FRE position

• Intake door motor
• A/C auto amp.
• Harness and connector

(CAN communication line is open 
or shorted)
(Intake door motor is open or 
shorted)

B263E

20P FRE DOOR FAIL

When the malfunctioning intake door posi-
tion is detected at 20% FRE position

B263F

REC DOOR FAIL

When the malfunctioning intake door posi-
tion is detected at REC position