Nissan Maxima. Manual - part 742

HAC-144

< DTC/CIRCUIT DIAGNOSIS >

[WITH MONOCHROME DISPLAY]

B2630, B2631 SUNLOAD SENSOR

B2630, B2631 SUNLOAD SENSOR

Description

INFOID:0000000010051145

COMPONENT DESCRIPTION

Sunload Sensor

• The sunload sensor (1) is located on the driver side defroster grille. 

• It detects sunload entering through windshield by means of a

photo diode. The sensor converts the sunload into a current value,

which is then input into the A/C auto amp.

Sunload Sensor Circuit

SUNLOAD INPUT PROCESS

The A/C auto amp. also equips a processing circuit which averages the variations in detected sunload over a

period of time. This prevents drastic swings in the air temperature control system operation due to small or

quick variations in detected sunload.

For example, consider driving along a road bordered by an occasional group of large trees. The sunload

detected by the sunload sensor varies whenever the trees obstruct the sunlight. The processing circuit aver-

ages the detected sunload over a period of time, so that the (insignificant) effect of the trees momentarily

obstructing the sunlight does not cause any change in the air temperature control system operation. On the

other hand, shortly after entering a long tunnel, the system recognizes the change in sunload, and the system

reacts accordingly.

DTC Logic

INFOID:0000000010051146

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"

. 

• Sunload sensor may register a malfunction when indoors, at dusk, or at other times when light is insufficient.

When performing the diagnosis indoors, light the sunload sensor with a lamp (60W or more).

AWIIA0033ZZ

JPIIA0615GB

DTC

Items

 (CONSULT screen terms)

Diagnostic item is detected when...

Possible cause

B2630

SUNLOAD SEN (SHORT)

Detected calorie at sunload sensor 1395 w/m

2

 

(1200 kcal/m

2

·h) or more

• Sunload sensor
• A/C auto amp.
• Harness and connector

(Sunload sensor circuit is open, or 
there is a short in the circuit)

B2631

SUNLOAD SEN (OPEN)

Detected calorie at sunload sensor 0 w/m

2

 (0 

kcal/m

2

·h)

B2630, B2631 SUNLOAD SENSOR

HAC-145

< DTC/CIRCUIT DIAGNOSIS >

[WITH MONOCHROME DISPLAY]

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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"

. 

• Sunload sensor may register a malfunction when indoors, at dusk, or at other times when light is insufficient.

When performing the diagnosis indoors, light the sunload sensor with a lamp (60W or more).

Is DTC No.“B2630” or “B2631” displayed?

YES

>> Perform trouble diagnosis for the sunload sensor. Refer to 

HAC-145, "Diagnosis Procedure"

. 

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010051147

Regarding Wiring Diagram information, refer to 

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

.

1.

CHECK SUNLOAD SENSOR POWER SUPPLY

1. Disconnect sunload sensor connector.

2. Turn ignition switch ON.

3. Check voltage between sunload sensor harness connector M56

terminal 1 and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> GO TO 4.

2.

CHECK CONTINUITY BETWEEN SUNLOAD SENSOR AND A/C AUTO AMP.

1. Turn ignition switch OFF.

2. Disconnect A/C auto amp. connector.

3. Check continuity between sunload sensor harness connector

M56 (A) terminal 2 and A/C auto amp. harness connector M37

(B) terminal 37.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK SUNLOAD SENSOR

1. Reconnect sunload sensor connector and A/C auto amp. connector.

2. Check sunload sensor. Refer to 

HAC-146, "Component Inspection"

.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

HAC-203, "Removal and Installation"

.

NO

>> Replace sunload sensor. Refer to 

HAC-206, "Removal and Installation"

.

4.

CHECK CONTINUITY BETWEEN SUNLOAD SENSOR AND A/C AUTO AMP.

1 - Ground

: Approx. 5V

AWIIA1139ZZ

2 - 37

: Continuity should exist.

AWIIA1140ZZ

HAC-146

< DTC/CIRCUIT DIAGNOSIS >

[WITH MONOCHROME DISPLAY]

B2630, B2631 SUNLOAD SENSOR

1. Turn ignition switch OFF.

2. Disconnect A/C auto amp. connector.

3. Check continuity between sunload sensor harness connector

M56 (A) terminal 1 and A/C auto amp. harness connector M37

(B) terminal 15.

4. Check continuity between sunload sensor harness connector

M56 (A) terminal 1 and ground.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

HAC-203, "Removal and Installation"

.

NO

>> Repair harness or connector.

Component Inspection

INFOID:0000000010051148

1.

CHECK SUNLOAD SENSOR

1. Turn ignition switch ON.

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

NOTE:

Select a place in direct sunlight when checking sunload sensor.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Replace sunload sensor. Refer to 

HAC-206, "Removal and Installation"

.

1 - 15

: Continuity should exist.

1 - Ground

: Continuity should not exist.

AWIIA1141ZZ

(+)

(

−)

A/C auto amp.

Connector

Terminal

M37

15

Ground

AWIIA1189GB

B2632, B2633 AIR MIX DOOR MOTOR (DRIVER SIDE)

HAC-147

< DTC/CIRCUIT DIAGNOSIS >

[WITH MONOCHROME DISPLAY]

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B2632, B2633 AIR MIX DOOR MOTOR (DRIVER SIDE)

Description

INFOID:0000000010051149

COMPONENT DESCRIPTION

Air Mix Door Motor (driver side)

• The air mix door motor (driver side) (1) is attached to the heater &

cooling unit assembly.

• It rotates so that the air mix door is opened or closed to a position

set by the A/C auto amp.

• Motor rotation is then conveyed through a shaft and the air mix

door position feedback is then sent to the A/C auto amp. by PBR

built-in air mix door motor.

DTC Logic

INFOID:0000000010051150

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.“B2632” or “B2633” displayed?

YES

>> Perform trouble diagnosis for the air mix door motor (driver side). Refer to 

HAC-148, "Diagnosis

Procedure"

. 

NO

>> GO TO 2.

2.

FUNCTION INSPECTION

1. Press the temperature control switch (driver side) until 32

°C (90°F) is displayed.

2. Check for warm air at discharge air outlets.

3. Operate the A/C compressor. 

4. Press the temperature control switch (driver side) until 18

°C (60°F) is displayed.

5. Check for cool air at air discharge outlets.
Does it operate normally?

YES

>> Inspection End.

AWIIA0024ZZ

DTC

Items

 (CONSULT screen terms)

Diagnostic item is detected when...

Possible cause

B2632

DR AIRMIX ACTR (SHORT)

Air mix door PBR (driver side) position 
5% or less

• Air mix door motor (driver side)
• A/C auto amp.
• Harness and connector

(CAN communication line is 
open or shorted)
(Air mix door motor is open or 
shorted)

B2633

DR AIRMIX ACTR (OPEN)

Air mix door PBR (driver side) position 
95% or more