Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Driver Side Seat Heater does not Operate

Toyota Tacoma 2015-2018 Service Manual / Seat / Seat Heater System / Driver Side Seat Heater does not Operate

DESCRIPTION

When the seat heater switch on the air conditioning control assembly 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

CAUTION / NOTICE / HINT

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch 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 43°C (96 to 109°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

2.

CHECK HARNESS AND CONNECTOR (BATTERY - FRONT SEAT CUSHION HEATER ASSEMBLY LH - BODY GROUND)

(a) Disconnect the S40 front seat cushion heater assembly LH connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

S40-3 (B) - Body ground

Ignition switch ON

11 to 14 V

Standard Resistance:

Tester Connection

Condition

Specified Condition

S40-5 (E) - Body ground

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

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

4.

INSPECT FRONT SEATBACK HEATER ASSEMBLY LH

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

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

NG

REPLACE FRONT SEATBACK HEATER ASSEMBLY LH

OK

5.

CHECK FRONT SEAT CUSHION HEATER ASSEMBLY LH

(a) Temporarily replace the front seat cushion heater assembly LH with a new or known good one (See page ). (b) Check that the seat heater system is operated normally. (b) Check that the seat heater system is operated normally. ).

(b) Check that the seat heater system is operated normally.

OK:

The seat heater system is operated normally.

Result

Result

Proceed to

NG

A

OK

B

B

END (FRONT SEAT CUSHION HEATER ASSEMBLY LH WAS DEFECTIVE)

A

6.

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) Disconnect the S40 front seat cushion heater assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A35-23 (SHD+) - S40-1 (B)

Always

Below 1 Ω

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

Always

Below 1 Ω

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

Always

Below 1 Ω

A35-23 (SHD+) or S40-1 (B)

Always

10 kΩ or higher

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

Always

10 kΩ or higher

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

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

(a) Temporarily replace the air conditioning amplifier assembly with a new or known good one (See page (b) Check that the seat heater system is operated normally. ).

(b) Check that the seat heater system is operated normally.

OK:

The seat heater system is operated normally.

Result

Result

Proceed to

NG

A

OK

B

A

END (AIR CONDITIONING AMPLIFIER ASSEMBLY WAS DEFECTIVE)

B

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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