Climate Control System does not Operate on Driver Side [02/2019 - ]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Air Conditioner / Active Test.
5. Perform the Active Test according to the display on the Techstream.

   Body Electrical > Air Conditioner > Active Test 

   Tester Display	Measurement Item	Control Range	Diagnostic Note
   Front Left Seat Blower	LH side seat blower operation	OFF/ON	-

   Body Electrical > Air Conditioner > Active Test 

   Tester Display
   Front Left Seat Blower

   Result

   Result	Proceed to
   Both seat cushion seat blower and seatback seat blower operate	A
   Only seat cushion seat blower does not operate	B
   Only seatback seat blower does not operate	C
   Both seat cushion seat blower and seatback seat blower do not operate	D

Result: 

B 

REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY LH. Refer to  DISASSEMBLY [11/2018 - 12/2021]  , or refer to  DISASSEMBLY [12/2021 - ] 

Result: 

C 

See step  4

Result: 

D 

See step  7

Result: 

A 

See step  2

1. Replace the refreshing seat switch (seat blower switch) with a new or known good one.

   Refer to REMOVAL [02/2019 - 10/2019] , or refer to REMOVAL [10/2019 - 08/2020] , or refer to REMOVAL [08/2020 - 12/2021] , or refer to REMOVAL [12/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  3

1. Check the climate control seat operation.

   Refer to OPERATION CHECK [11/2018 - ]

   OK

   The climate control seat operates normally.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (REFRESHING SEAT SWITCH [SEAT BLOWER SWITCH] WAS DEFECTIVE) 

Result: 

NG 

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [11/2018 - ] 

1. Disconnect the T25 seatback climate control blower LH connector.
2. Disconnect the T11 seat cushion climate control blower assembly LH connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   T25-4 (GND) - T11-4 (BFB-)	Always	Below 1 Ω
   T25-4 (GND) or T11-4 (BFB-) - Other terminals and body ground	Always	10 kΩ or higher
   T25-1 (IG) - T11-5 (CTB)	Always	Below 1 Ω
   T25-1 (IG) or T11-5 (CTB) - Other terminals and body ground	Always	10 kΩ or higher
   T25-3 (BFB+) - T11-6 (BBS)	Always	Below 1 Ω
   T25-3 (BFB+) or T11-6 (BBS) - Other terminals and body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Replace the seatback climate control blower LH with a new or known good one.

   Refer to DISASSEMBLY [11/2018 - 12/2021] , or refer to DISASSEMBLY [12/2021 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  6

1. Check the climate control seat operation.

   Refer to OPERATION CHECK [11/2018 - ]

   OK

   The climate control seat operates normally.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (SEATBACK CLIMATE CONTROL BLOWER LH WAS DEFECTIVE) 

Result: 

NG 

REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY LH. Refer to  DISASSEMBLY [11/2018 - 12/2021]  , or refer to  DISASSEMBLY [12/2021 - ] 

1. Disconnect the seat cushion climate control blower assembly LH connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Seat Cushion Climate Control Blower Assembly LH)

2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   T11-1 (IG) - Body ground	Power switch on (IG)	11 to 14 V
   T11-1 (IG) - Body ground	Power switch off	Below 1 V

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   T11-8 (GND) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  8

1. Disconnect the T11 seat cushion climate control blower assembly LH connector.
2. Disconnect the G46 air conditioning amplifier assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   T11-7 (SIGN) - G46-14 (LOUT)	Always	Below 1 Ω
   T11-7 (SIGN) or G46-14 (LOUT) - Other terminals and body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  9

1. Check for pulses according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Air Conditioning Amplifier Assembly)

   MEASUREMENT CONDITION
   
   

   Item	Content
   Tester Connection	G46-14 (LOUT) - Body ground
   Tool Setting	1 V/DIV., 1 ms/DIV.
   Vehicle Condition	Power switch on (IG) LH side refreshing seat switch (seat blower switch) operate

   OK

   Waveform is similar to that shown in the illustration.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY LH. Refer to  DISASSEMBLY [11/2018 - 12/2021]  , or refer to  DISASSEMBLY [12/2021 - ] 

Result: 

NG 

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [11/2018 - ]