Toyota Tacoma (2015-2018) Service Manual: 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
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 | .gif) |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
|
.gif)
|
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 |
|
|
3. |
INSPECT FRONT SEAT CUSHION HEATER ASSEMBLY LH |
(a) Remove the front seat cushion heater assembly LH (See page
.gif)
).
(b) Inspect the front seat cushion heater assembly LH (See page
).
| NG | |
REPLACE FRONT SEAT CUSHION HEATER ASSEMBLY LH |
|
|
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
).
| NG | |
REPLACE FRONT SEATBACK HEATER ASSEMBLY LH |
|
|
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.
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) |
|
|
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 |
|
|
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.
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 |
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 ...
Front Passenger 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 ...
Other materials:
Low Output Signal of Rear Speed Sensor RH (Test Mode DTC) (C1273,C1274,C1403,C1404)
DESCRIPTION
Refer to DTCs C1401 and C1402 (See page ).
DTC Code
DTC Detection Condition
Trouble Area
C1273
C1274
Stored only during test mode.
Rear speed sensor RH/LH
Rear speed sensor rotor RH/LH (rear ax ...
Removal
REMOVAL
CAUTION / NOTICE / HINT
HINT:
Use the same procedure for both the LH and RH sides.
The procedure described below is for the LH side.
PROCEDURE
1. REMOVE FRONT BUMPER ASSEMBLY
(See page
)
2. REMOVE HEADLIGHT ASSEMBLY
(a) Apply protective tape around the headlight ...
Diagnosis System
DIAGNOSIS SYSTEM
DIAGNOSIS FUNCTION
(a) The diagnosis function turns off the cruise control indicator, illuminates
the master warning light and displays a warning message when a malfunction is detected.
When a malfunction is detected in the dynamic radar cruise control system, DTCs
are store ...
