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 Hv 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

1.

CLEAR DTC

(a) Clear the DTCs.

Click here

Body Electrical > Air Conditioner > Clear DTCs
NEXT

2.

CHECK FOR DTC

(a) Check for DTCs.

Click here

Body Electrical > Air Conditioner > Trouble Codes

OK:

DTC B14C1 is not output.

OK

USE SIMULATION METHOD TO CHECK

NG

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)
NG

REPLACE FRONT SEAT CUSHION HEATER ASSEMBLY LH

OK

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
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
    Front Right Seat Heat Sensor Circuit (B14C0)

    Data List / Active Test

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