RM38N0EC _58 Vehicle Interior _111839 SEAT _0505697 CLIMATE CONTROL SEAT SYSTEM J

SEAT  CLIMATE CONTROL SEAT SYSTEM  Climate Control Seat System does not Operate  


DESCRIPTION

When the ignition switch is on and the climate control switch is operated, the air conditioning amplifier assembly receives climate control switch position signals and then sends airflow amount signals to each seat climate control blower.

WIRING DIAGRAM

B520545

CAUTION / NOTICE / HINT

NOTICE:
·

Inspect the fuses for circuits related to this system before performing the following procedure.

·

If the auxiliary battery voltage becomes low, auxiliary battery load control will operate in order to ensure sufficient power is supplied to the power steering system. In this case, the climate control seat system may not operate.

·

The climate control seat system uses the LIN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the climate control seat system after confirming that the communication system is functioning properly.

Click hereVehicle Interior>SEAT>CLIMATE CONTROL SEAT SYSTEM>HOW TO PROCEED WITH TROUBLESHOOTING



PROCEDURE

1.CHECK DTC OUTPUT
a.

Clear DTCs.

Body Electrical > Air Conditioner > Clear DTCs
50002 450

b.

Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes
50001 450

Result:
Result Proceed to
DTC B14B587 is not output A
DTC B14B587 output B



A

2.CHECK CLIMATE CONTROL SEAT OPERATION

B

GO TO SEAT HEATER SYSTEM

Click hereVehicle Interior>SEAT>SEAT HEATER SYSTEM>DIAGNOSTIC TROUBLE CODE CHART


2.CHECK CLIMATE CONTROL SEAT OPERATION
a.

Check the climate control seat operation.

Click hereVehicle Interior>SEAT>CLIMATE CONTROL SEAT SYSTEM>ON-VEHICLE INSPECTION


Result:
Result Proceed to
Climate control seat does not operate (for LH) A
Climate control seat does not operate (for RH) B
Both climate control seats do not operate C



A

3.PERFORM ACTIVE TEST USING GTS

B

10.PERFORM ACTIVE TEST USING GTS

C

17.INSPECT S/HTR FR RELAY
3.PERFORM ACTIVE TEST USING GTS
a.

Perform the Active Test according to the display on the GTS.

Body Electrical > Air Conditioner > Active Test
Tester Display Measurement Item Control Range Diagnostic Note
Front Left Seat Blower Front LH seat blower operation OFF or ON -
Body Electrical > Air Conditioner > Active Test
Tester Display
Front Left Seat Blower
50004 450 22
OK:

The seat blower operates normally.



Result:
Result Proceed to
Only seatback climate control blower LH A
Only seat cushion climate control blower LH does not operate B
Both seat blowers do not operate C



A

4.CHECK HARNESS AND CONNECTOR (SEAT CUSHION CLIMATE CONTROL BLOWER LH - SEATBACK CLIMATE CONTROL BLOWER LH)

B

REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER LH

for SFTM Made: Click hereVehicle Interior>SEAT>FRONT SEAT ASSEMBLY (for SFTM Made Power Seat)>DISASSEMBLY

for GTMC Made: Click hereVehicle Interior>SEAT>FRONT SEAT ASSEMBLY (for GTMC Made Power Seat)>DISASSEMBLY


C

7.CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - SEAT CUSHION CLIMATE CONTROL BLOWER LH - BODY GROUND)
4.CHECK HARNESS AND CONNECTOR (SEAT CUSHION CLIMATE CONTROL BLOWER LH - SEATBACK CLIMATE CONTROL BLOWER LH)
a.

Disconnect the V11 seatback climate control blower LH connector.


b.

Disconnect the U39 seat cushion climate control blower LH connector.


c.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition

Click Location & Routing(V11,U39)Location & Routing

Click Connector(V11)Seat>No. 2 Front Seat Wire RH / No. 2 Front Seat Wire LH>Seatback Climate Control Blower LH

Click Connector(U39)Seat>Front Seat Wire RH / Front Seat Wire LH>Seat Cushion Climate Control Blower Assembly LH

V11-1 (CTB) - U39-5 (CTB) Always Below 1 Ω
V11-1 (CTB) or U39-5 (CTB) - Body ground Always 10 kΩ or higher
V11-3 (BFB+) - U39-6 (BFB+) Always Below 1 Ω
V11-3 (BFB+) or U39-6 (BFB+) - Body ground Always 10 kΩ or higher
V11-4 (BFB-) - U39-4 (BFB-) Always Below 1 Ω
V11-4 (BFB-) or U39-4 (BFB-) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

5.REPLACE SEAT BACK CLIMATE CONTROL BLOWER LH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.REPLACE SEAT BACK CLIMATE CONTROL BLOWER LH
a.

Temporarily replace the seatback climate control blower LH with a new or known good one.

for SFTM Made: Click hereVehicle Interior>SEAT>FRONT SEAT ASSEMBLY (for SFTM Made Power Seat)>DISASSEMBLY

for GTMC Made: Click hereVehicle Interior>SEAT>FRONT SEAT ASSEMBLY (for GTMC Made Power Seat)>DISASSEMBLY


Result:
Proceed to
NEXT



NEXT

6.CHECK CLIMATE CONTROL SEAT OPERATION
6.CHECK CLIMATE CONTROL SEAT OPERATION
a.

Check the climate control seat operation.

Click hereVehicle Interior>SEAT>CLIMATE CONTROL SEAT SYSTEM>ON-VEHICLE INSPECTION

OK:

The climate control seat operates normally.



Result:
Proceed to
OK
NG



OK

END (SEATBACK CLIMATE CONTROL BLOWER LH WAS DEFECTIVE)

NG

REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER LH

for SFTM Made: Click hereVehicle Interior>SEAT>FRONT SEAT ASSEMBLY (for SFTM Made Power Seat)>DISASSEMBLY

for GTMC Made: Click hereVehicle Interior>SEAT>FRONT SEAT ASSEMBLY (for GTMC Made Power Seat)>DISASSEMBLY


7.CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - SEAT CUSHION CLIMATE CONTROL BLOWER LH - BODY GROUND)
a.

Disconnect the U39 seat cushion climate control blower LH connector.


b.

Measure the voltage and resistance according to the value(s) in the table below.

Standard Voltage:
Tester Connection Condition Specified Condition

Click Location & Routing(U39)Location & Routing

Click Connector(U39)Seat>Front Seat Wire RH / Front Seat Wire LH>Seat Cushion Climate Control Blower Assembly LH

U39-1 (IG) - Body ground Ignition switch ON 11 to 14 V
U39-1 (IG) - Body ground Ignition switch off Below 1 V


Standard Resistance:
Tester Connection Condition Specified Condition

Click Location & Routing(U39)Location & Routing

Click Connector(U39)Seat>Front Seat Wire RH / Front Seat Wire LH>Seat Cushion Climate Control Blower Assembly LH

U39-8 (GND) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

8.CHECK HARNESS AND CONNECTOR (SEAT CUSHION CLIMATE CONTROL BLOWER LH - AIR CONDITIONING AMPLIFIER ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.CHECK HARNESS AND CONNECTOR (SEAT CUSHION CLIMATE CONTROL BLOWER LH - AIR CONDITIONING AMPLIFIER ASSEMBLY)
a.

Disconnect the E44 air conditioning amplifier assembly connector.


b.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition

Click Location & Routing(U39,E44)Location & Routing

Click Connector(U39)Seat>Front Seat Wire RH / Front Seat Wire LH>Seat Cushion Climate Control Blower Assembly LH

Click Connector(E44)Instrument Panel>Instrument Panel Wire / Radio Wiring Sub-Assy / Telephone Computer Wire>Air Conditioning Amplifier Assembly

U39-7 (SIGN) - E44-14 (LOUT) Always Below 1 Ω
U39-7 (SIGN) or E44-14 (LOUT) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

9.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY
a.

Reconnect the E44 air conditioning amplifier assembly connector.


b.
B592585
*a Component with harness connected
(Air Conditioning Amplifier Assembly)


Reconnect the U39 seat cushion climate control blower LH connector.


c.

Using an oscilloscope, check the input signal waveform.

Measurement Condition
Item Content
Tester Connection E44-14 (LOUT) - Body ground
Tool Setting 1 V/DIV., 0.5 ms/DIV.
Vehicle Condition
·

Ignition switch ON

·

Climate control switch (for LH) on

(blower position)



OK:

Waveform is similar to that shown in the illustration.



Result:
Proceed to
OK
NG



OK

REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER LH

for SFTM Made: Click hereVehicle Interior>SEAT>FRONT SEAT ASSEMBLY (for SFTM Made Power Seat)>DISASSEMBLY

for GTMC Made: Click hereVehicle Interior>SEAT>FRONT SEAT ASSEMBLY (for GTMC Made Power Seat)>DISASSEMBLY


NG

21.REPLACE CLIMATE CONTROL SWITCH (REFRESHING SEAT SWITCH)
10.PERFORM ACTIVE TEST USING GTS
a.

Perform the Active Test according to the display on the GTS.

Body Electrical > Air Conditioner > Active Test
Tester Display Measurement Item Control Range Diagnostic Note
Front Right Seat Blower Front RH seat blower operation OFF or ON -
Body Electrical > Air Conditioner > Active Test
Tester Display
Front Right Seat Blower
50004 450 21
OK:

The seat blower operates normally.



Result:
Result Proceed to
Only seatback climate control blower RH does not operate A
Only seat cushion climate control blower RH does not operate B
Both seat blowers do not operate C



A

11.CHECK HARNESS AND CONNECTOR (SEATBACK CLIMATE CONTROL BLOWER RH - SEAT CUSHION CLIMATE CONTROL BLOWER RH)

B

REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER RH

for SFTM Made: Click hereVehicle Interior>SEAT>FRONT SEAT ASSEMBLY (for SFTM Made Power Seat)>DISASSEMBLY

for GTMC Made: Click hereVehicle Interior>SEAT>FRONT SEAT ASSEMBLY (for GTMC Made Power Seat)>DISASSEMBLY


C

14.CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - SEAT CUSHION CLIMATE CONTROL BLOWER RH - BODY GROUND)
11.CHECK HARNESS AND CONNECTOR (SEATBACK CLIMATE CONTROL BLOWER RH - SEAT CUSHION CLIMATE CONTROL BLOWER RH)
a.

Disconnect the V1 seatback climate control blower RH connector.


b.

Disconnect the U7 seat cushion climate control blower RH connector.


c.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition

Click Location & Routing(V1,U7)Location & Routing

Click Connector(V1)Seat>No. 2 Front Seat Wire RH / No. 2 Front Seat Wire LH>Seatback Climate Control Blower RH

Click Connector(U7)Seat>Front Seat Wire RH / Front Seat Wire LH>Seat Cushion Climate Control Blower Assembly RH

V1-1 (CTB) - U7-5 (CTB) Always Below 1 Ω
V1-1 (CTB) or U7-5 (CTB) - Body ground Always 10 kΩ or higher
V1-3 (BFB+) - U7-6 (BFB+) Always Below 1 Ω
V1-3 (BFB+) or U7-6 (BFB+) - Body ground Always 10 kΩ or higher
V1-4 (BFB-) - U7-4 (BFB) Always Below 1 Ω
V1-4 (BFB-) or U7-4 (BFB) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

12.REPLACE SEAT BACK CLIMATE CONTROL BLOWER RH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

12.REPLACE SEAT BACK CLIMATE CONTROL BLOWER RH
a.

Temporarily replace the seatback climate control blower RH with a new or known good one.

for SFTM Made: Click hereVehicle Interior>SEAT>FRONT SEAT ASSEMBLY (for SFTM Made Power Seat)>DISASSEMBLY

for GTMC Made: Click hereVehicle Interior>SEAT>FRONT SEAT ASSEMBLY (for GTMC Made Power Seat)>DISASSEMBLY


Result:
Proceed to
NEXT



NEXT

13.CHECK CLIMATE CONTROL SEAT OPERATION
13.CHECK CLIMATE CONTROL SEAT OPERATION
a.

Check the climate control seat operation.

Click hereVehicle Interior>SEAT>CLIMATE CONTROL SEAT SYSTEM>ON-VEHICLE INSPECTION

OK:

The climate control seat operates normally.



Result:
Proceed to
OK
NG



OK

END (SEATBACK CLIMATE CONTROL BLOWER RH WAS DEFECTIVE)

NG

REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER RH

for SFTM Made: Click hereVehicle Interior>SEAT>FRONT SEAT ASSEMBLY (for SFTM Made Power Seat)>DISASSEMBLY

for GTMC Made: Click hereVehicle Interior>SEAT>FRONT SEAT ASSEMBLY (for GTMC Made Power Seat)>DISASSEMBLY


14.CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - SEAT CUSHION CLIMATE CONTROL BLOWER RH - BODY GROUND)
a.

Disconnect the U7 seat cushion climate control blower RH connector.


b.

Measure the voltage and resistance according to the value(s) in the table below.

Standard Voltage:
Tester Connection Condition Specified Condition

Click Location & Routing(U7)Location & Routing

Click Connector(U7)Seat>Front Seat Wire RH / Front Seat Wire LH>Seat Cushion Climate Control Blower Assembly RH

U7-1 (+BAT) - Body ground Ignition switch ON 11 to 14 V
U7-1 (+BAT) - Body ground Ignition switch off Below 1 V


Standard Resistance:
Tester Connection Condition Specified Condition

Click Location & Routing(U7)Location & Routing

Click Connector(U7)Seat>Front Seat Wire RH / Front Seat Wire LH>Seat Cushion Climate Control Blower Assembly RH

U7-8 (GND) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

15.CHECK HARNESS AND CONNECTOR (SEAT CUSHION CLIMATE CONTROL BLOWER RH - AIR CONDITIONING AMPLIFIER ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

15.CHECK HARNESS AND CONNECTOR (SEAT CUSHION CLIMATE CONTROL BLOWER RH - AIR CONDITIONING AMPLIFIER ASSEMBLY)
a.

Disconnect the E44 air conditioning amplifier assembly connector.


b.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition

Click Location & Routing(U7,E44)Location & Routing

Click Connector(U7)Seat>Front Seat Wire RH / Front Seat Wire LH>Seat Cushion Climate Control Blower Assembly RH

Click Connector(E44)Instrument Panel>Instrument Panel Wire / Radio Wiring Sub-Assy / Telephone Computer Wire>Air Conditioning Amplifier Assembly

U7-7 (SIGN) - E44-13 (ROUT) Always Below 1 Ω
U7-7 (SIGN) or E44-13 (ROUT) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

16.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

16.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY
a.

Reconnect the E44 air conditioning amplifier assembly connector.


b.
B592585
*a Component with harness connected
(Air Conditioning Amplifier Assembly)


Reconnect the U7 seat cushion climate control blower RH connector.


c.

Using an oscilloscope, check the input signal waveform.

Measurement Condition
Item Content
Tester Connection E44-13 (ROUT) - Body ground
Tool Setting 1 V/DIV., 0.5 ms/DIV.
Vehicle Condition
·

Ignition switch ON

·

Climate control switch (for RH) on

(blower position)



OK:

Waveform is similar to that shown in the illustration.



Result:
Proceed to
OK
NG



OK

REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER RH

for SFTM Made: Click hereVehicle Interior>SEAT>FRONT SEAT ASSEMBLY (for SFTM Made Power Seat)>DISASSEMBLY

for GTMC Made: Click hereVehicle Interior>SEAT>FRONT SEAT ASSEMBLY (for GTMC Made Power Seat)>DISASSEMBLY


NG

21.REPLACE CLIMATE CONTROL SWITCH (REFRESHING SEAT SWITCH)
17.INSPECT S/HTR FR RELAY
a.
E209082

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
3 - 5 Auxiliary battery voltage applied between terminals 1 and 2 Below 1 Ω
3 - 5 Auxiliary battery voltage not applied between terminals 10 kΩ or higher


Result:
Proceed to
OK
NG




OK

18.CHECK HARNESS AND CONNECTOR (POWER SUPPLY - S/HTR FR RELAY)

NG

REPLACE S/HTR FR RELAY

18.CHECK HARNESS AND CONNECTOR (POWER SUPPLY - S/HTR FR RELAY)
a.
B530042
*a S/HTR FR Relay Holder


Measure the voltage according to the value(s) in the table below.

Standard Voltage:
Tester Connection Condition Specified Condition
S/HTR FR relay holder terminal 1 - Body ground Ignition switch ON 11 V to 14 V
S/HTR FR relay holder terminal 5 - Body ground Ignition switch off*1
Always*2 		11 V to 14 V


*1: for HV Model

*2: for Gasoline Model



Result:
Proceed to
OK
NG



OK

19.CHECK HARNESS AND CONNECTOR (S/HTR FR RELAY - SEAT CUSHION CLIMATE CONTROL BLOWER LH - SEAT CUSHION CLIMATE CONTROL BLOWER RH)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

19.CHECK HARNESS AND CONNECTOR (S/HTR FR RELAY - SEAT CUSHION CLIMATE CONTROL BLOWER LH - SEAT CUSHION CLIMATE CONTROL BLOWER RH)
a.

Disconnect the U39 seat cushion climate control blower LH connector.


b.

Disconnect the U7 seat cushion climate control blower RH connector.


c.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition

Click Location & Routing(U7,U39)Location & Routing

Click Connector(U7)Seat>Front Seat Wire RH / Front Seat Wire LH>Seat Cushion Climate Control Blower Assembly RH

Click Connector(U39)Seat>Front Seat Wire RH / Front Seat Wire LH>Seat Cushion Climate Control Blower Assembly LH

S/HTR FR relay holder terminal 3 - U7-1 (+BAT) or U39-1 (IG) Always Below 1 Ω
S/HTR FR relay holder terminal 3, U7-1 (+BAT) or U39-1 (IG) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

20.CHECK HARNESS AND CONNECTOR (S/HTR FR RELAY - BODY GROUND)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

20.CHECK HARNESS AND CONNECTOR (S/HTR FR RELAY - BODY GROUND)
a.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
S/HTR FR relay holder terminal 2 - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

21.REPLACE CLIMATE CONTROL SWITCH (REFRESHING SEAT SWITCH)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

21.REPLACE CLIMATE CONTROL SWITCH (REFRESHING SEAT SWITCH)
a.

Temporarily replace the climate control switch (refreshing seat switch) with a new or known good one.

Click hereVehicle Interior>SEAT>SEAT HEATER SWITCH>REMOVAL


Result:
Proceed to
NEXT



NEXT

22.CHECK CLIMATE CONTROL SEAT OPERATION
22.CHECK CLIMATE CONTROL SEAT OPERATION
a.

Check the climate control seat operation.

Click hereVehicle Interior>SEAT>CLIMATE CONTROL SEAT SYSTEM>ON-VEHICLE INSPECTION

OK:

The climate control seat operates normally.



Result:
Proceed to
OK
NG



OK

END (CLIMATE CONTROL SWITCH (REFRESHING SEAT SWITCH) WAS DEFECTIVE)

NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING AMPLIFIER>REMOVAL