RM38N0EC _58 Vehicle Interior _111839 SEAT _0505696 SEAT HEATER SYSTEM J

SEAT  SEAT HEATER SYSTEM  Seat Heater for Front Left Seat does not Operate  


DESCRIPTION

When the seat heater switch of the front seat heater switch (refreshing seat switch) is operated, the air conditioning amplifier assembly receives a signal and operates the front seat heater.

WIRING DIAGRAM

B636948E02
0.854,0.667 1.469,0.865 0.615,0.198 10 false LIN1 1.219,4.802 1.677,5 0.458,0.198 10 false E44 2.063,1.479 2.885,1.729 0.823,0.25 10 false S/HTR F/L 3.135,1.292 5.188,1.635 2.052,0.344 10 false from S/HTR FR Relay 4.792,1.042 5.25,1.24 0.458,0.198 10 false L9 4.771,1.229 6.75,1.635 1.979,0.406 10 false Front Seat Heater Switch (Refreshing Seat Switch) 5.146,0.667 5.688,0.958 0.542,0.292 10 false SLIN 3.958,4.719 5.417,5.115 1.458,0.396 10 false Front Seat Cushion Heater Assembly LH 0.094,5.219 1.667,5.854 1.573,0.635 10 false Air Conditioning Amplifier Assembly 0.833,6.292 4.5,6.49 3.667,0.198 10 false : LIN Communication Line 1.26,4.615 1.583,4.958 0.323,0.344 10 false 17 4.958,0.51 5.573,0.729 0.615,0.219 10 false 8 0.823,4.792 1.281,4.99 0.458,0.198 10 false GND 1.24,4 1.688,4.375 0.448,0.375 10 false 13 1.219,4.198 1.677,4.396 0.458,0.198 10 false E46 0.74,4.188 1.198,4.385 0.458,0.198 10 false SM1L 1.219,0.677 1.677,0.875 0.458,0.198 10 false E44 3.573,4.198 4.031,4.396 0.458,0.198 10 false U27 5.677,4.719 7.083,5.292 1.406,0.573 10 false Front Seatback Heater Assembly LH 3.635,1.979 3.792,2.177 0.156,0.198 10 false 2 3.646,3.115 3.802,3.313 0.156,0.198 10 false 1 5.417,2.146 5.875,2.344 0.458,0.198 10 false A 5.406,2.854 5.865,3.052 0.458,0.198 10 false A 3.563,3.313 4.021,3.51 0.458,0.198 10 false U27 3.573,2.156 4.031,2.354 0.458,0.198 10 false U27 3.646,4.021 3.802,4.219 0.156,0.198 10 false 6 1.302,0.458 1.458,0.656 0.156,0.198 10 false 7

CAUTION / NOTICE / HINT

NOTICE:
·

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 seat heater system may not operate.

·

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



PROCEDURE

1.CLEAR DTC
a.

Clear the DTCs.

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.

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

DTC B14C111, B14C115 and B14B587 are not output.



Result:
Proceed to
OK
NG



OK

3.PERFORM ACTIVE TEST USING GTS

NG

GO TO DIAGNOSTIC TROUBLE CODE CHART

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


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 Heater Front seat LH side seat heater operation OFF or ON -
Body Electrical > Air Conditioner > Active Test
Tester Display
Front Left Seat Heater
50004 450 18
OK:

The seat heater operates normally.



Result:
Proceed to
OK
NG



OK

REPLACE FRONT SEAT HEATER SWITCH (REFRESHING SEAT SWITCH)

Click hereVehicle Interior>SEAT>SEAT HEATER SWITCH>REMOVAL


NG

4.INSPECT FRONT SEATBACK HEATER ASSEMBLY LH
6.CHECK HARNESS AND CONNECTOR (FRONT SEAT CUSHION HEATER ASSEMBLY LH - POWER SUPPLY AND BODY GROUND)
a.

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

Standard Resistance:
Tester Connection Condition Specified Condition

Click Location & Routing(U27)Location & Routing

Click Connector(U27)Seat>Front Seat Wire RH / Front Seat Wire LH>Front Seat Cushion Heater Assembly LH

U27-2 - Body ground Always Below 1 Ω



b.

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

Standard Voltage:
Tester Connection Condition Specified Condition

Click Location & Routing(U27)Location & Routing

Click Connector(U27)Seat>Front Seat Wire RH / Front Seat Wire LH>Front Seat Cushion Heater Assembly LH

U27-1 - Body ground Ignition switch ON 11 to 14 V
U27-1 - Body ground Ignition switch off Below 1 V



Result:
Proceed to
OK
NG



OK

7.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - FRONT SEAT CUSHION HEATER ASSEMBLY LH)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - FRONT SEAT CUSHION HEATER ASSEMBLY LH)
a.

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

Standard Resistance:
Tester Connection Condition Specified Condition

Click Location & Routing(E46,U27)Location & Routing

Click Connector(E46)Instrument Panel>Instrument Panel Wire / Radio Wiring Sub-Assy / Telephone Computer Wire>Air Conditioning Amplifier Assembly

Click Connector(U27)Seat>Front Seat Wire RH / Front Seat Wire LH>Front Seat Cushion Heater Assembly LH

E46-13 (SM1L) - U27-6 Always Below 1 Ω
E46-13 (SM1L) or U27-6 - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR