Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Front Left Seat Heat Sensor Circuit (B14C1)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Vehicle Interior / Seat / Seat Heater System(for Gasoline Model) / Front Left Seat Heat Sensor Circuit (B14C1)

DESCRIPTION

Output to the front seat cushion heater temperature sensor stops if one of the following occurs: 1) the temperature sensor is open or shorted; or 2) the temperature sensor is damaged and its output value does not change.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B14C1	Front Left Seat Heat Sensor Circuit	Seat heater temperature sensor malfunction	Air conditioning amplifier assembly Front Seat Cushion Heater Assembly LH Wire harness or connector

WIRING DIAGRAM

PROCEDURE

CLEAR DTC

(a) Clear the DTCs.

Click here

Body Electrical > Air Conditioner > Clear DTCs

2.	CHECK FOR DTC

(a) Check for DTCs.

Click here

Body Electrical > Air Conditioner > Trouble Codes

OK:

DTC B14C1 is not output.

USE SIMULATION METHOD TO CHECK

3.	INSPECT FRONT SEAT CUSHION HEATER ASSEMBLY LH

(a) Disconnect the R26 front seat cushion heater assembly LH connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
R26-4 (THL) - R26-5 (PL)	Seat heater temperature 25°C (77°F)	9.5 to 10.5 kΩ

*a	Component without harness connected (Front Seat Cushion Heater Assembly LH)

REPLACE FRONT SEAT CUSHION HEATER ASSEMBLY LH

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

(a) Disconnect the G36 and G37 air conditioning amplifier assembly connectors.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
G37-17 (TSL) - R26-4 (THL)	Always	Below 1 Ω
G37-17 (TSL) or R26-4 (THL) - Body ground	Always	10 kΩ or higher
G36-8 (SG-5) - R26-5 (PL)	Always	Below 1 Ω
G36-8 (SG-5) or R26-5 (PL) - Body ground	Always	10 kΩ or higher

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

Front Right Seat Heat Sensor Circuit (B14C0)

Data List / Active Test

See More:

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DESCRIPTION This DTC is stored when a malfunction occurs in the speakers. DTC No. Detection Item DTC Detection Condition Trouble Area B15C3 Speaker Output Short A short is detected in the speaker output circuit Harness or connector Speaker DCM (telematics transceiver)* Stereo Component Amplifier *: ...

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Front Left Seat Heat Sensor Circuit (B14C1)

Front Right Seat Heat Sensor Circuit (B14C0)

Data List / Active Test

See More:

Toyota Avalon (XX50) 2019-2022 Owners Manual

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual