Toyota Tacoma (2015-2018) Service Manual: Front Right Seat Heat Sensor Circuit (B14C0)

Toyota Tacoma (2015-2018) Service Manual / Seat / Seat Heater System / Front Right Seat Heat Sensor Circuit (B14C0)

DESCRIPTION

Output to the front seat cushion heater assembly RH 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 Code	DTC Detection Condition	Trouble Area
B14C0	Seat heater temperature sensor malfunction	Air conditioning amplifier assembly Front seat cushion heater assembly RH Wire harness or connector

WIRING DIAGRAM

PROCEDURE

CLEAR DTC

(a) Clear the DTCs (See page ).

2.	CHECK FOR DTC

(a) Check for DTCs (See page OK: ).

OK:

DTC B14C0 is not output.

USE SIMULATION METHOD TO CHECK

3.	READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Body Electrical / Air Conditioner / Data List.

(e) Check the value(s) by referring to the table below.

Air Conditioner:

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
FR Seat Heater Temperature	Front seat RH side seat heater temperature / min: -29.7°C or max: 59.55°C	Within range from 36 to 42.2°C (96 to 108°F)	Front seat heater is on

OK:

The display is as specified in the normal condition column.

Result

Result	Proceed to
NG	A
OK	B

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

4.	INSPECT FRONT SEAT CUSHION HEATER ASSEMBLY RH

(a) Remove the front seat cushion heater assembly RH (See page (b) Inspect the front seat cushion heater assembly RH (See page ).

(b) Inspect the front seat cushion heater assembly RH (See page ).

REPLACE FRONT SEAT CUSHION HEATER ASSEMBLY RH

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

(a) Disconnect the A35 and A36 air conditioning amplifier assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A36-31 (TSR) - S41-2 (TH)	Always	Below 1 Ω
A35-15 (SG-2) - S41-6 (E)	Always	Below 1 Ω
A36-31 (TSR) - Body ground	Always	10 kΩ or higher
A35-15 (SG-2)) - Body ground	Always	10 kΩ or higher

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

Diagnostic Trouble Code Chart

DIAGNOSTIC TROUBLE CODE CHART HINT: If a trouble code is displayed during the DTC check, inspect the trouble areas listed for that code. For details of the code, refer to the "See page" ...

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