Nissan Sentra B18 (2020-2025) Service Manual: A/c Auto Amp.

AMB TEMP SEN

Ignition switch ON

Equivalent to ambient temperature

(Display range: -40 - 215° C)

IN-VEH TEMP

Ignition switch ON

Equivalent to in-Nissan Sentra vehicle temperature

(Display range: -40 - 215° C)

When a DTC is detected, 215°C is displayed for the value for the below Data Monitor item regardless of the cause of the malfunction.

INT TEMP SEN

Ignition switch ON

Equivalent to evaporator fin temperature

(Display range: -40 - 215° C)

When a DTC is detected, 215°C is displayed for the value for the below Data Monitor item regardless of the cause of the malfunction.

SUNLOAD SEN

Ignition switch ON

Equivalent to sunload amount

(Display range: 0 - 1275 W/m^2)

AMB SEN CAL

Ignition switch ON

Equivalent to ambient temperature

(Display range: -40 - 215° C)

IN -VEH CAL

Ignition switch ON

Equivalent to in-Nissan Sentra vehicle temperature

(Display range: -40 - 215° C)

When a DTC is detected, 215°C is displayed for the value for the below Data Monitor item regardless of the cause of the malfunction.

INT TEMP CAL

Ignition switch ON

Equivalent to evaporator fin temperature

(Display range: -40 - 215° C)

When a DTC is detected, 215°C is displayed for the value for the below Data Monitor item regardless of the cause of the malfunction.

SUNL SEN CAL

Ignition switch ON

Equivalent to sunload amount

(Display range: 0 - 1275 W/m^2)

XM

Ignition switch ON

Value according to target air flow temperature (driver side)

(Display range: -100 - 150)

FAN REQ SIG

Ignition switch ON

Blower motor: ON

On

Blower motor: OFF

Off

FAN DUTY

Engine: Run at idle after warming up

Blower motor: ON

25 – 81%

(Display range: 0 - 100%)

Blower motor: OFF

0

COMP REQ SIG

Ignition switch ON

A/C switch : ON

request

A/C switch : OFF

not request

A/C comp clutch status

Engine: Run at idle after warming up

A/C switch : ON

On

A/C switch : OFF

Off

Cooling fan request

Ignition switch ON

Equivalent to cooling fan operation request

Rear window defogger request

Ignition switch ON

Rear window defogger switch: ON

On

Rear window defogger switch: OFF

Off

Eco mode request

Ignition switch ON

Drive mode: ECO

Request

Other than above

Not REQ

Illumination control duty

Ignition switch ON

Equivalent to illumination control duty

Refrigerant PRESS SEN value

Ignition switch ON

Equivalent to refrigerant pressure

Heated steering wheel request

This item displayed, but cannot be monitored.

Nissan Sentra Vehicle speed

When driving the Nissan Sentra vehicle

Equivalent to speedometer reading

(Display range: 0 - 120 km/h)

ODO/TRIP METER

Ignition switch ON

Equivalent to odometer reading

Engine RPM

Engine: Running

Equivalent to tachometer reading

(Display range: 0 - 8191.75 rpm)

ENG COOL TEMP

Ignition switch ON

Equivalent to engine coolant temperature

(Display range: -40 - 215° C)

1

(W)

58

(LA/B)

Door motor power supply

Output

Ignition switch ON

Battery voltage

22

(G)

58

(LA/B)

LIN1 (door motor)

Input/Output

Ignition switch ON

23

(L)

26

(LA/BR)

Intake sensor signal

Input

Ignition switch ON

26

(LA/BR)

Ground

Sensor ground 1

—

Ignition switch ON

0 – 0.1 V

34

(R)

58

(LA/B)

Blower motor control circuit

Output

Ignition switch ON

Blower motor: OFF

Battery voltage

Blower motor: 1st speed (manual)

47

(G)

78

(BR)

Sunload sensor signal

Input

Ignition switch ON

48

(Y)

78

(BR)

In-Nissan Sentra vehicle sensor signal

Input

Ignition switch ON

50

(LA/L)

—

CAN-High

Input/Output

—

—

55²

(W)

Ground

Heated seat LH high relay control signal

Output

Heated seat ON

0 V

Heated seat OFF

Battery voltage

56¹

(V)

Ground

Heated steering wheel relay control signal

Output

Ignition switch ON

Heated steering wheel switch: While pressing

0 V

Other than the above

Battery voltage

58

(LA/B)

Ground

Ground

—

Ignition switch ON

0 – 0.1 V

60

(P)

58

(LA/B)

Accessory power supply

Input

Ignition switch OFF (auto ACC status) or ON

Battery voltage

Ignition switch OFF (not auto ACC status)

0 – 0.1 V

68

(LA/SB)

58

(LA/B)

LIN2 (A/C control)

Input/Output

Ignition switch ON

70

(LA/P)

—

CAN-Low

Input/Output

—

—

75²

(R)

Ground

Heated seat LH low relay control signal

Output

Heated seat ON

0 V

Heated seat OFF

Battery voltage

76²

(LG)

Ground

Heated seat RH low relay control signal

Output

Heated seat ON

0 V

Heated seat OFF

Battery voltage

78

(BR)

Ground

Sensor ground 2

—

Ignition switch ON

0 – 0.1 V

79²

(GR)

Ground

Heated seat RH high relay control signal

Output

Heated seat ON

0 V

Heated seat OFF

Battery voltage

A/C switch

: ON

Air outlet

: AUTO

Air inlet

: FRE (Fresh air intake)

Blower fan speed

: AUTO

Set temperature

: Setting before communication error occurs

1

• U1010–49: CONTROL UNIT(CAN)

• U2140-87: CAN comm err (ECM)

• U2148-87: CAN comm err (brake control unit)

• U214E-87: CAN comm err (combination meter)

• U214F-87: CAN comm err (BCM)

• U215B-87: CAN comm err (IPDM E/R)

2

• B24A4–11: INTAKE SENSOR

• B24A4–15: INTAKE SENSOR

• B24A6–11: IN-Nissan Sentra Vehicle SENSOR

• B24A6–15: IN-VEHICLE SENSOR

• B24AF-12: Front heated seat relay LH (LO)

• B24AF-14: Front heated seat relay LH (LO)

• B24B0-12: Front heated seat relay LH (HI)

• B24B0-14: Front heated seat relay LH (HI)

• B24B4-02: A/C CONTROL

• B24BA-12: Front heated seat relay RH (LO)

• B24BA-14: Front heated seat relay RH (LO)

• B24BC-12: Front heated seat relay RH (HI)

• B24BC-14: Front heated seat relay RH (HI)

• B24D4-08: A/C CONTROL COMM

• B24F4-12: STEERING HEATER RELAY

• B24F4-14: STEERING HEATER RELAY

• B24F5-93: Mode door motor

• B24F6-93: Intake door motor

• B24F7-93: Air mix door motor 1

• B24F8-93: Air mix door motor 2

B24A4–11

INTAKE SENSOR

DTC Diagnosis Procedure

B24A4–15

INTAKE SENSOR

DTC Diagnosis Procedure

B24A6–11

IN-Nissan Sentra Vehicle SENSOR

DTC Diagnosis Procedure

B24A6–15

IN-Nissan Sentra Vehicle SENSOR

DTC Diagnosis Procedure

B24AF-12

Front heated seat relay LH (LO)*

DTC Diagnosis Procedure

B24AF-14

Front heated seat relay LH (LO)*

DTC Diagnosis Procedure

B24B4-02

A/C CONTROL

DTC Diagnosis Procedure

B24B0-12

Front heated seat relay LH (HI)*

DTC Diagnosis Procedure

B24B0-14

Front heated seat relay LH (HI)*

DTC Diagnosis Procedure

B24BA-12

Front heated seat relay RH (LO)*

DTC Diagnosis Procedure

B24BA-14

Front heated seat relay RH (LO)*

DTC Diagnosis Procedure

B24BC-12

Front heated seat relay RH (HI)*

DTC Diagnosis Procedure

B24BC-14

Front heated seat relay RH (HI)*

DTC Diagnosis Procedure

B24D4-08

A/C CONTROL COMM

DTC Diagnosis Procedure

B24F4-12

STEERING HEATER RELAY*

DTC Diagnosis Procedure

B24F4-14

STEERING HEATER RELAY*

DTC Diagnosis Procedure

B24F5-93

Mode door motor

DTC Diagnosis Procedure

B24F6-93

Intake door motor

DTC Diagnosis Procedure

B24F7-93

Air mix door motor 1

DTC Diagnosis Procedure

B24F8-93

Air mix door motor 2

DTC Diagnosis Procedure

U1010–49

CONTROL UNIT(CAN)

DTC Diagnosis Procedure

U2140-87

CAN comm err (ECM)

DTC Diagnosis Procedure

U2148-87

CAN comm err (brake control unit)

DTC Diagnosis Procedure

U214E-87

CAN comm err (combination meter)

DTC Diagnosis Procedure

U214F-87

CAN comm err (BCM)

DTC Diagnosis Procedure

U215B-87

CAN comm err (IPDM E/R)

DTC Diagnosis Procedure