Nissan Murano: Heater & Air Conditioning Control System :: Ecu Diagnosis Information / A/c Auto Amp.

Nissan Murano (Z52) 2015-2024 Service Manual / Ventilation, Heater & Air Conditioner / Heater & Air Conditioning Control System :: Ecu Diagnosis Information / A/c Auto Amp.

Values on the Diagnosis Tool

NOTE:

The following table includes information (items) inapplicable to this Nissan Murano vehicle: For information (items) applicable to this vehicle, refer to CONSULT display items.

Monitor item Condition Value/Status
AMB TEMP SEN Ignition switch ON — Equivalent to ambient temperature
IN-VEH TEMP Ignition switch ON — Equivalent to in-Nissan Murano vehicle temperature (front side)
INT TEMP SEN Ignition switch ON — Equivalent to front evaporator fin temperature
SUNLOAD SEN Ignition switch ON — Equivalent to sunload (driver side)
AMB SEN CAL Ignition switch ON — Equivalent to ambient temperature
IN-VEH CAL Ignition switch ON — Equivalent to in-Nissan Murano vehicle temperature (front side)
INT TEMP CAL Ignition switch ON — Equivalent to front evaporator fin temperature
SUNL SEN CAL Ignition switch ON — Equivalent to sunload (driver side)
COMP REQ SIG Engine: Run at idle after warming up

A/C switch: ON

(Compressor operation status ON) 		On

A/C switch: OFF

(Compressor operation status OFF) 		Off
FAN REQ SIG Engine: Run at idle after warming up Front blower motor: ON On
Front blower motor: OFF Off
FAN DUTY Engine: Run at idle after warming up Front blower motor: ON 25 – 81
Front blower motor: OFF 0
XM Ignition switch ON — Value according to target air flow temperature (driver side)
PA TARGET A/TEMP Ignition switch ON — Value according to target air flow temperature (passenger side)
ENG COOL TEMP Ignition switch ON — Equivalent to engine coolant temperature
Nissan Murano Vehicle SPEED Driving — Equivalent to speedometer reading
PASS SUNL CAL Ignition switch ON — Equivalent to sunload (passenger side)
PASS SUNL SEN CAL Ignition switch ON — Equivalent to sunload (passenger side)
Reference Value

TERMINAL LAYOUT

PHYSICAL VALUES

Terminal No.

(Wire color) 		Description Condition

Value

(Approx.)
+ − Signal name Input/Output

1

(L) 		— CAN-High Input/Output — —

2

(B) 		— Ground — — —

3

(G) 		Ground Battery power supply Input Ignition switch OFF Battery voltage

4

(BR) 		Ground

Communication signal

(A/C auto amp.→A/C switch assembly) 		Output Ignition switch ON

7

(L) 		Ground Ambient sensor signal Input Ignition switch ON

0 – 4.8 V

Output voltage varies with ambient temperature

8*

(G) 		Ground Heated steering wheel switch signal Input Ignition switch ON Heated steering wheel switch: While pressing 0 V
Other than the above Battery voltage

9

(LG) 		Ground Sunload sensor signal (driver side) Input Ignition switch ON

0 – 4.8 V

Output voltage varies with sunload amount

13

(P) 		Ground Ignition power supply 2 Input Ignition switch ON Battery voltage

15

(Y) 		Ground Rear window defogger switch Output Ignition switch ON ON 0 V
OFF 5 V

16

(G) 		Ground Each door motor LIN communication Input/Output Ignition switch ON

17

(W) 		Ground Each door motor power supply Output Ignition switch ON Battery voltage

18

(W) 		Ground Front blower motor control signal Output

  • Ignition switch ON

  • Front fan speed: 1st speed (manual)

20*

(BR) 		Ground Heated steering wheel relay control signal Output Ignition switch ON Within 30 seconds after turning ON the heated steering switch. 0 V
Other than the above Battery voltage

21

(P) 		— CAN-Low Input/Output — —

22

(B) 		— Ground — — —

23

(LG) 		Ground Ignition power supply Input Ignition switch ON Battery voltage

24

(V) 		Ground

Communication signal

(A/C switch assembly→A/C auto amp.) 		Input Ignition switch ON

26

(W) 		— Sensor ground — — —

27

(Y) 		Ground In-Nissan Murano vehicle sensor signal Input Ignition switch ON

0 – 4.8 V

Output voltage varies with in-Nissan Murano vehicle temperature

28

(P) 		Ground Intake sensor signal Input Ignition switch ON

0 – 4.8 V

Output voltage varies with front evaporator fin temperature

35

(P) 		Ground Rear window defogger feedback Input Ignition switch ON Rear defogger: ON Battery voltage
Rear defogger: OFF 0 V

36

(BG) 		Ground Sunload sensor signal (passenger side) Input Ignition switch ON

0 – 4.8 V

Output voltage varies with front evaporator fin temperature

37

(B) 		— Ground — — —

40

(G) 		Ground ECV (electrical control valve) control signal Output

  • Ignition switch ON

  • Active test (HVAC test): MODE 1

*: With heated steering wheel

Fail-safe

FAIL-SAFE FUNCTION

If a communication error exists between the A/C auto amp., and the AV control unit and preset switch for 30 seconds or longer, air conditioning is controlled under the following conditions:

When ambient temperature is less than 37°F (3°C) and engine coolant temperature is less than 133°F (56°C)
A/C compressor : ON
Air outlet : DEF
Air inlet : FRE (Fresh air intake)
Blower fan speed : AUTO
Set temperature : Setting before communication error occurs
When ambient temperature is 37°F (3°C) or more, or engine coolant temperature is 133°F (56°C) or more
A/C compressor : ON
Air outlet : AUTO
Air inlet : 20% FRE (20% fresh air intake)
Blower fan speed : AUTO
Set temperature : Setting before communication error occurs
DTC Inspection Priority Chart

If some DTCs are displayed at the same time, perform inspections one by one based on the following priority chart:

Priority Detected items (DTC)
1 U1000: CAN COMM CIRCUIT
U1010: CONTROL UNIT(CAN)
B2796: FR SW COMM ERROR
B27B0: A/C AUTO AMP.
2 B2578: IN-Nissan Murano Vehicle SENSOR
B2579: IN-VEHICLE SENSOR
B257B: AMBIENT SENSOR
B257C: AMBIENT SENSOR
B2581: INTAKE SENSOR
B2582: INTAKE SENSOR
B2630: SUNLOAD SENSOR
B2631: SUNLOAD SENSOR
B2632: DR AIR MIX DOOR MOT
B2633: DR AIR MIX DOOR MOT
B2634: PASS AIR MIX DOOR MOT
B2635: PASS AIR MIX DOOR MOT
B2636: DR VENT DOOR FAIL
B2637: DR B/L DOOR FAIL
B2638: DR D/F1 DOOR FAIL
B2639: DR DEF DOOR FAIL
263D: FRE DOOR FAIL
263E: 20P FRE DOOR FAIL
B263F: REC DOOR FAIL
B2654: D/F2 DOOR FAIL
B2655: B/L2 DOOR FAIL
B2667: PASS SUNLOAD SENSOR
B2668: PASS SUNLOAD SENSOR
DTC Index
DTC

Items

(CONSULT screen terms) 		Reference
U1000 CAN COMM CIRCUIT DTC Description
U1010 CONTROL UNIT(CAN) DTC Description
B2578 IN-Nissan Murano Vehicle SENSOR DTC Description
B2579 IN-Nissan Murano Vehicle SENSOR DTC Description
B257B AMBIENT SENSOR DTC Description
B257C AMBIENT SENSOR DTC Description
B2581 INTAKE SENSOR DTC Description
B2582 INTAKE SENSOR DTC Description
B2630* SUNLOAD SENSOR DTC Description
B2631* SUNLOAD SENSOR DTC Description
B2632 DR AIR MIX DOOR MOT DTC Description
B2633 DR AIR MIX DOOR MOT DTC Description
B2634 PASS AIR MIX DOOR MOT DTC Description
B2635 PASS AIR MIX DOOR MOT DTC Description
B2636 DR VENT DOOR FAIL DTC Description
B2637 DR B/L DOOR FAIL DTC Description
B2638 DR D/F1 DOOR FAIL DTC Description
B2639 DR DEF DOOR FAIL DTC Description
B263D FRE DOOR FAIL DTC Description
B263E 20P FRE DOOR FAIL DTC Description
B263F REC DOOR FAIL DTC Description
B2654 D/F2 DOOR FAIL DTC Description
B2655 B/L2 DOOR FAIL DTC Description
B2667* PASS SUNLOAD SENSOR DTC Description
B2668* PASS SUNLOAD SENSOR DTC Description
B2796 FR SW COMM ERROR DTC Description
B27B0 A/C AUTO AMP. DTC Description

*: Perform self-diagnosis under sunshine. When performing indoors, aim a light (more than 60 W) at sunload sensor, otherwise self-diagnosis indicates even though the sunload sensor is functioning normally.

NOTE:

If all of door motor DTCs (B2632, B2633, B2634, B2635, B2636, B2637, B2638, B2639, B263D, B263E, B263F, B2654 and B2655) are detected, check door motor communication circuit. Refer to Diagnosis Procedure.

    Heater & Air Conditioning Control System :: Ecu Diagnosis Information

    ..

    Ecm, Ipdm E/r, Bcm

    L..

    Other information:

    Nissan Murano (Z52) 2015-2024 Owners Manual: Owner’s Manual/Service Manual order information


    Genuine NISSAN Service Manuals for this model year and prior can be purchased. A Genuine NISSAN Service Manual is the best source of service and repair information for your vehicle. This manual is the same one used by the factory-trained technicians working at NISSAN dealerships...

    Nissan Murano (Z52) 2015-2024 Service Manual: Operation


    Switch Name and Function Controller (A/C switch assembly) 1. AUTO switch 2. Temperature control dial (driver side) 3. Defroster switch 4. Fan switch 5. A/C switch 6. Recirculation switch 7. Fresh air switch 8. Temperature control dial (passenger side) 9...

    Categories

    Autolight system

    Nissan Murano. Autolight system

    The autolight system allows the headlights to turn on and off automatically. The autolight system can:

    Turn on the headlights, front parking, tail, license plate and instrument panel lights automatically when it is dark. Turn off all the lights (except daylight running lights) when it is light. Keep all the lights on for a period of time after you place the ignition switch in the OFF position and all doors are closed.

    read more

     
    Copyright © 2025 www.nimurano.com