Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Front Left Seat Heat Sensor Circuit (B14C1)

Toyota Tacoma 2015-2018 Service Manual / Seat / Seat Heater System / Front Left Seat Heat Sensor Circuit (B14C1)

DESCRIPTION

Output to the front seat cushion heater assembly LH 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

B14C1

Seat heater temperature sensor malfunction

  • Air conditioning amplifier assembly
  • Front seat cushion heater assembly LH
  • Wire harness or connector

WIRING DIAGRAM

PROCEDURE

PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs (See page ).

NEXT

2.

CHECK FOR DTC

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

OK:

DTC B14C1 is not output.

OK

USE SIMULATION METHOD TO CHECK

NG

3.

READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream 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

FL Seat Heater Temperature

Front seat LH 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

B

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

A

4.

INSPECT FRONT SEAT CUSHION HEATER ASSEMBLY LH

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

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

NG

REPLACE FRONT SEAT CUSHION HEATER ASSEMBLY LH

OK

5.

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

(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

A36-32 (TSL) - S40-2 (TH)

Always

Below 1 Ω

A35-15 (SG-2) - S40-6 (E)

Always

Below 1 Ω

A36-32 (TSL) - Body ground

Always

10 kΩ or higher

A35-15 (SG-2) - Body ground

Always

10 kΩ or higher

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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