RM36D0EC _58 Vehicle Interior _083102 SEAT _0407267 SEAT HEATER SYSTEM(for Gasoline Model) C

SEAT  SEAT HEATER SYSTEM(for Gasoline Model)  B14B587  Lost Communication with Front Seat Temperature Adjustment Switch LIN Missing Message  


DESCRIPTION

The refreshing seat switch (seat heater switch) communicates with the air conditioning amplifier assembly via LIN communication.

If the LIN communication malfunctions, the seat heater system does not operate even if the refreshing seat switch (seat heater switch) is operated.

DTC No. Detection Item DTC Detection Condition Trouble Area
B14B587 Lost Communication with Front Seat Temperature Adjustment Switch LIN Missing Message Lost communication with refreshing seat switch (seat heater switch)
·

Harness or connector

·

Refreshing seat switch (seat heater switch)

·

Air conditioning amplifier assembly



WIRING DIAGRAM

E409335E28
0.708,3.354 2.302,3.542 1.594,0.188 10 false : LIN Communication Line 0.906,0.531 1.906,0.75 1,0.219 10 false from IGP Relay 5.438,3.208 7.052,3.583 1.615,0.375 10 false Air Conditioning Amplifier Assembly 2.25,0.698 3.208,0.875 0.958,0.177 10 false ECU-IGP NO.3 3.344,0.542 3.573,0.719 0.229,0.177 10 false IG 3.333,1.125 3.698,1.292 0.365,0.167 10 false E 3.854,0.885 4.25,1.052 0.396,0.167 10 false SLIN 2.156,1.844 5.042,2.073 2.885,0.229 10 false Refreshing Seat Switch (Seat Heater Switch) 5.823,0.875 6.188,1.042 0.365,0.167 10 false LIN1 2.75,3.323 5.01,3.51 2.26,0.188 10 false Air Conditioning Control Assembly 3.875,2.656 4.24,2.823 0.365,0.167 10 false LIN1 2.167,1.688 2.49,1.854 0.323,0.167 10 false G31 3.135,0.417 3.281,0.604 0.146,0.188 10 false 9 3.156,1.01 3.302,1.198 0.146,0.188 10 false 7 4.25,0.729 4.396,0.917 0.146,0.188 10 false 8 2.75,3.167 3.073,3.333 0.323,0.167 10 false G24 4.26,2.49 4.406,2.667 0.146,0.177 10 false 7 5.604,0.719 5.802,0.906 0.198,0.188 10 false 7 5.448,3.042 6.333,3.229 0.885,0.188 10 false G46

CAUTION / NOTICE / HINT

HINT:

Inspect the fuse related to this system before inspecting the suspected areas below.


PROCEDURE

1.CLEAR DTC
a.

Clear the DTCs.

Click hereVehicle Interior>SEAT>SEAT HEATER SYSTEM (for Gasoline Model)>DTC CHECK / CLEAR

Body Electrical > Air Conditioner > Clear DTCs
50002 450

Result:
Proceed to
NEXT



NEXT

2.CHECK FOR DTC
2.CHECK FOR DTC
a.

Check for DTCs.

Click hereVehicle Interior>SEAT>SEAT HEATER SYSTEM (for Gasoline Model)>DTC CHECK / CLEAR

Body Electrical > Air Conditioner > Trouble Codes
50001 450

Result:
Result Proceed to
DTC B14B587 and B14B287 are not output A
Only DTC B14B587 is output B
Both B14B587 and B14B287 are output C



A

USE SIMULATION METHOD TO CHECK

Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>HOW TO PROCEED WITH TROUBLESHOOTING


B

3.CHECK HARNESS AND CONNECTOR (REFRESHING SEAT SWITCH (SEAT HEATER SWITCH) - BATTERY AND BODY GROUND)

C

GO TO DTC B14B287

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING SYSTEM (for Gasoline Model)>B14B287


3.CHECK HARNESS AND CONNECTOR (REFRESHING SEAT SWITCH (SEAT HEATER SWITCH) - BATTERY AND BODY GROUND)
a.
E407963C02
1.49,0.156 1.927,0.427 0.438,0.271 1.927,1.542 2.26,1.948 true 1.073,1.906 1.542,1.542 true 0.208,0.094 0.406,0.26 0.198,0.167 10 false *a 1.583,0.208 1.917,0.385 0.333,0.177 10 false G31 2.302,1.938 2.5,2.094 0.198,0.156 10 false IG 0.938,1.917 1.094,2.094 0.156,0.177 10 false E
*a Front view of wire harness connector
(to Refreshing Seat Switch [Seat Heater Switch])


Disconnect the refreshing seat switch (seat heater switch) connector.


b.

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

Standard Voltage:
Tester Connection Switch Condition Specified Condition
G31-9 (IG) - Body ground Engine switch on (IG) 11 to 14 V
G31-9 (IG) - Body ground Engine switch off Below 1 V



c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
G31-7 (E) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

4.CHECK HARNESS AND CONNECTOR (REFRESHING SEAT SWITCH (SEAT HEATER SWITCH) - AIR CONDITIONING AMPLIFIER ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.CHECK HARNESS AND CONNECTOR (REFRESHING SEAT SWITCH (SEAT HEATER SWITCH) - AIR CONDITIONING AMPLIFIER ASSEMBLY)
a.

Disconnect the G31 refreshing seat switch (seat heater switch) connector.


b.

Disconnect the G24 air conditioning control assembly connector.


c.

Disconnect the G46 air conditioning amplifier assembly connector.


d.

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

Standard Resistance:
Tester Connection Condition Specified Condition
G31-8 (SLIN) - G46-7 (LIN1) Always Below 1 Ω
G31-8 (SLIN) or G46-7 (LIN1) - Other terminals and body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

5.REPLACE REFRESHING SEAT SWITCH (SEAT HEATER SWITCH)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.REPLACE REFRESHING SEAT SWITCH (SEAT HEATER SWITCH)
a.

Replace the refreshing seat switch (seat heater switch) with a new or known good one.

Click hereVehicle Interior>SEAT>SEAT HEATER SWITCH (for Front Seat)>REMOVAL


Result:
Proceed to
NEXT



NEXT

6.CHECK FOR DTC
6.CHECK FOR DTC
a.

Clear the DTCs.

Click hereVehicle Interior>SEAT>SEAT HEATER SYSTEM (for Gasoline Model)>DTC CHECK / CLEAR

Body Electrical > Air Conditioner > Clear DTCs
50002 450

b.

Check for DTCs.

Click hereVehicle Interior>SEAT>SEAT HEATER SYSTEM (for Gasoline Model)>DTC CHECK / CLEAR

Body Electrical > Air Conditioner > Trouble Codes
50001 450
OK:

DTC B14B587 is not output.



Result:
Proceed to
OK
NG



OK

END (REFRESHING SEAT SWITCH (SEAT HEATER SWITCH) WAS DEFECTIVE)

NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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