Nissan Murano: Seat :: Dtc/circuit Diagnosis / Seat Back Heater
Component Function Check
CHECK SEAT BACK HEATER FUNCTION
Check whether or not the temperature of the seat back heater changes in accordance with the HEAT switch operation of the climate controlled seat control switch.
Is the inspection result normal?
YES>>
Inspection End.
NO>>
Refer to Diagnosis Procedure.
Diagnosis Procedure
CHECK SEAT BACK HEATER INPUT SIGNAL
-
Ignition switch ON.
-
Check voltage between seat back heater harness connectors.
| Seat back heater | Condition |
Voltage
(Approx.) |
| Connector | (+) | (-) |
| Terminal |
| LH |
B213 |
1 |
2 |
Climate controlled seat switch |
HEAT |
0 V - 12 V* |
| OFF |
0 V |
| RH |
B309 |
1 |
2 |
Climate controlled seat switch |
HEAT |
0 V - 12 V* |
| OFF |
0 V |
*:It changes between 12 and 0 V.
NOTE:
Wait 1 minute or more after the activation start, and then start the measurement.
Is the inspection result normal?
YES>>
Replace seat back heater. Refer to Exploded View.
NO>>
GO TO 2.
CHECK SEAT BACK HEATER CIRCUIT
-
Ignition switch OFF.
-
Disconnect climate controlled seat control unit connector and seat back heater connector.
-
Check continuity between climate controlled seat control unit harness connector and seat back heater harness connector.
| Climate controlled seat control unit | Seat back heater | Continuity |
| Connector | Terminal | Connector | Terminal |
| LH |
B204 |
27 |
B213 |
2 |
Yes |
| 29 |
1 |
| RH |
B321 |
27 |
B309 |
2 |
| 29 |
1 |
-
Check continuity between climate controlled seat control unit harness connector and ground.
| Climate controlled seat control unit | — | Continuity |
| Connector | Terminal |
| LH |
B204 |
27 |
Ground |
No |
| 29 |
| RH |
B321 |
27 |
| 29 |
Is the inspection result normal?
YES>>
Replace climate controlled seat control unit. Refer to Climate Controlled Seat Control Unit.
NO>>
Repair or replace harness.
Component Function Check
CHECK CLIMATE CONTROLLED SEAT SWITCH INDICATOR FUNCTION
Check that the related indicator lamp illuminates when climate controlled seat switch is set to HEAT or COOL mode...
Component Function Check
CHECK SEAT BACK HEATER FUNCTION
Check whether or not the temperature of the seat back heater changes in accordance with the HEAT switch operation of the climate controlled seat control switch...
Other information:
Removal and Installation
REMOVALRemove back door kicking plate. Refer to Removal and Installation.
Remove rear kicking plate. Refer to Removal and Installation - Rear Kicking Plate.
Remove luggage side upper finisher. Refer to Removal and Installation...
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 LAYOUTPHYSICAL VALUES
Terminal No...