Seat Heater System Seat Heater For Front Left Seat Does Not Operate

Vehicle Interior. Land Cruiser. Urj200, 202 Grj200 Vdj200
Seat. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR DTC

CHECK HARNESS AND CONNECTOR (BATTERY - SEAT HEATER CONTROL SUB-ASSEMBLY LH - BODY GROUND)

INSPECT SEAT HEATER CONTROL SUB-ASSEMBLY LH

INSPECT FRONT SEAT CUSHION HEATER ASSEMBLY LH

INSPECT FRONT SEATBACK HEATER ASSEMBLY LH

CHECK HARNESS AND CONNECTOR (SEAT HEATER CONTROL SUB-ASSEMBLY LH - AIR CONDITIONING AMPLIFIER ASSEMBLY)

CHECK SEAT HEATER CONTROL SUB-ASSEMBLY LH

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

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


DESCRIPTION

When the refreshing seat switch is operated, the air conditioning amplifier assembly receives the signal. The air conditioning amplifier assembly receives the signal and operates the front seat heater.

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Seat.Front Power Seat Control System (W/ Seat Position Memory System).Seat Heater System Seat Heater For Front Left Seat Does Not Operate


INSPECTION PROCEDURE

NOTICE:
  1. Inspect the fuses and relays for circuits related to this system before performing the following inspection procedure.
  2. First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no LIN communication malfunctions before troubleshooting this symptom.
1.CHECK FOR DTC

  1. Clear the DTCs (Click here).

  1. Check for DTCs (Click here).

    Result:
    Result
    		Proceed to
    DTC B14C1 is not output
    		A
    DTC B14C1 is output
    		B


B
GO TO DIAGNOSTIC TROUBLE CODE CHART (Click here)
A


2.CHECK HARNESS AND CONNECTOR (BATTERY - SEAT HEATER CONTROL SUB-ASSEMBLY LH - BODY GROUND)
Land Cruiser. Urj200, 202 Grj200 Vdj200.Seat.Front Power Seat Control System (W/ Seat Position Memory System).Seat Heater System Seat Heater For Front Left Seat Does Not Operate

  1. Disconnect the seat heater control sub-assembly LH connector.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    c13-4 (B) - Body ground
    		Engine switch on (IG)
    		11 to 14 V
    c13-4 (B) - Body ground
    		Engine switch off (IG)
    		Below 1 V
    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    c13-6 (E) - Body ground
    		Always
    		Below 1 Ω
Text in Illustration
*a
Front view of wire harness connector
(to Seat Heater Control Sub-assembly LH)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT SEAT HEATER CONTROL SUB-ASSEMBLY LH
Land Cruiser. Urj200, 202 Grj200 Vdj200.Seat.Front Power Seat Control System (W/ Seat Position Memory System).Seat Heater System Seat Heater For Front Left Seat Does Not Operate

  1. Remove the seat heater control sub-assembly LH (Click here).

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

Standard Resistance:
Tester Connection
Condition
Specified Condition
c13-5 (THL) - SHL-2 (TH1)
Always
Below 1 Ω
c13-5 (THL) or SHL-2 (TH1) - Body ground
Always
10k Ω or higher
c13-2 (PL) - SHL-3 (TH2)
Always
Below 1 Ω
c13-2 (PL) or SHL-3 (TH2) - Body ground
Always
10k Ω or higher
Text in Illustration
*a
Seat Heater Control Sub-assembly LH
(to Air Conditioning Amplifier Assembly)
*b
Seat Heater Control Sub-assembly LH
(to Front Seat Cushion Heater Assembly LH)


NG
REPLACE SEAT HEATER CONTROL SUB-ASSEMBLY LH (Click here)
OK


4.INSPECT FRONT SEAT CUSHION HEATER ASSEMBLY LH

  1. Remove the front seat cushion heater assembly LH (Click here).

  1. Inspect the front seat cushion heater assembly LH (Click here).



NG
REPLACE FRONT SEAT CUSHION HEATER ASSEMBLY LH (Click here)
OK


5.INSPECT FRONT SEATBACK HEATER ASSEMBLY LH

  1. Remove the front seatback heater assembly LH (Click here).

  1. Inspect the front seatback heater assembly LH (Click here).



NG
REPLACE FRONT SEATBACK HEATER ASSEMBLY LH (Click here)
OK


6.CHECK HARNESS AND CONNECTOR (SEAT HEATER CONTROL SUB-ASSEMBLY LH - AIR CONDITIONING AMPLIFIER ASSEMBLY)

  1. Disconnect the E35 and E36 air conditioning amplifier assembly connectors.

  1. Disconnect the c13 seat heater control sub-assembly LH connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E36-16 (SHD+) - c13-1 (SWL)
    		Always
    		Below 1 Ω
    E36-16 (SHD+) or c13-1 (SWL) - Body ground
    		Always
    		10 kΩ or higher
    E35-19 (TSL) - c13-5 (THL)
    		Always
    		Below 1 Ω
    E35-19 (TSL) or c13-5 (THL) - Body ground
    		Always
    		10 kΩ or higher
    E35-34 (SG-4) - c13-2 (PL)
    		Always
    		Below 1 Ω
    E35-34 (SG-4) or c13-2 (PL) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


7.CHECK SEAT HEATER CONTROL SUB-ASSEMBLY LH

  1. Replace the seat heater control sub-assembly LH with a new or known good one (Click here).

  1. Check that the front seat heater system is operated normally.

    OK:
    The front seat heater operates normally.


OK
END (SEAT HEATER CONTROL SUB-ASSEMBLY LH WAS DEFECTIVE)
NG


8.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

  1. Replace the air conditioning amplifier assembly with a new or known good one (Click here).

  1. Check that the front seat heater system is operated normally.

    OK:
    The front seat heater operates normally.


NG
REPLACE REFRESHING SEAT SWITCH (Click here)
OK

END (AIR CONDITIONING AMPLIFIER ASSEMBLY WAS DEFECTIVE)