Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Climate Control Seat System does not Operate

Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual / Vehicle Interior / Seat / Climate Control Seat System / Climate Control Seat System does not Operate

DESCRIPTION

The air conditioning amplifier assembly receives refreshing seat switch position signals when the engine switch is on (IG), and then transmits airflow amount signals to each seat climate blower.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • The climate control seat system uses the LIN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the climate control seat system after confirming that the communication system is functioning properly.

    Click here

  • If the battery voltage is low, the seat climate control seat system may not operate. When "Operation of Electrical Items Restricted." is displayed on the multi-information display in the combination meter assembly, inspect the battery, referring to On-vehicle Inspection for the charging system.

    Click here

PROCEDURE

1.

CHECK DTC OUTPUT

(a) Clear DTCs.

Click here

Body Electrical > Air Conditioner > Clear DTCs

(b) Check for DTCs.

Click here

Body Electrical > Air Conditioner > Trouble Codes

Result

Proceed to

DTC B14B5 is not output

A

DTC B14B5 output

B
B

GO TO SEAT HEATER SYSTEM

A

2.

CHECK CLIMATE CONTROL SEAT OPERATION

(a) Check the climate control seat operation.

Click here

Result

Proceed to

Climate control seat does not operate (for LH)

A

Climate control seat does not operate (for RH)

B

Both climate control seats do not operate

C
B

GO TO STEP 12

C

GO TO STEP 21

A

3.

CHECK CLIMATE CONTROL SEAT OPERATION (FRONT LH SEAT)

(a) Check the climate control seat operation again.

Click here

Result

Proceed to

Only seatback climate control blower LH does not operate

A

Only seat cushion climate control blower assembly LH does not operate

B

Both climate control blowers do not operate

C
B

REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY LH

C

GO TO STEP 7

A

4.

CHECK HARNESS AND CONNECTOR (SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY LH - SEATBACK CLIMATE CONTROL BLOWER LH)

(a) Disconnect the e1 seatback climate control blower LH connector.

(b) Disconnect the c10 seat cushion climate control blower assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

e1-1 (VDD2) - c10-5 (VDD2)

Always

Below 1 Ω

e1-1 (VDD2) or c10-5 (VDD2) - Body ground

Always

10 kΩ or higher

e1-3 (SC2) - c10-6 (SC2)

Always

Below 1 Ω

e1-3 (SC2) or c10-6 (SC2) - Body ground

Always

10 kΩ or higher

e1-4 (GND2) - c10-4 (GND2)

Always

Below 1 Ω

e1-4 (GND2) or c10-4 (GND2) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

REPLACE SEATBACK CLIMATE CONTROL BLOWER LH

(a) Temporarily replace the seatback climate control blower LH with a new or known good one.

Click here

NEXT

6.

CHECK CLIMATE CONTROL SEAT OPERATION

(a) Check the climate control seat operation.

Click here

OK:

The climate control seat operates normally.

OK

END (SEATBACK CLIMATE CONTROL BLOWER LH WAS DEFECTIVE)
NG

REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY LH

7.

CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY LH - BODY GROUND)

(a) Disconnect the c10 seat cushion climate control blower assembly LH connector.

*a

Front view of wire harness connector

(to Seat Cushion Climate Control Blower Assembly LH)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

c10-1 (VDD1) - Body ground

Engine switch on (IG)

11 to 14 V

c10-1 (VDD1) - Body ground

Engine switch off

Below 1 V

Standard Resistance:

Tester Connection

Condition

Specified Condition

c10-8 (GND1) - Body ground

Always

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

8.

CHECK HARNESS AND CONNECTOR (SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY LH - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the J43 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

c10-7 (SC1) - J43-24 (LOUT)

Always

Below 1 Ω

c10-7 (SC1) or J43-24 (LOUT) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

9.

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

(a) Reconnect the J43 air conditioning amplifier assembly connector.

(b) Reconnect the c10 seat cushion climate control blower assembly LH connector.

*a

Component with harness connected

(Air Conditioning Amplifier Assembly)

(c) Check the input signal waveform.

Measurement Condition

Item

Content

Tester Connection

J43-24 (LOUT) - Body ground

Tool Setting

1 V/DIV., 1 ms/DIV.

Vehicle Condition
  • Engine switch on (IG)
  • Refreshing seat switch (for front LH side) on

    (blower position)

OK:

Waveform is similar to that shown in the illustration.

OK

REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY LH

NG

10.

REPLACE REFRESHING SEAT SWITCH (FOR FRONT SIDE)

(a) Temporarily replace the refreshing seat switch (for front side) with a new or known good one.

Click here

NEXT

11.

CHECK CLIMATE CONTROL SEAT OPERATION

(a) Check the climate control seat operation.

Click here

OK:

The climate control seat operates normally.

OK

END (REFRESHING SEAT SWITCH (FOR FRONT SIDE) WAS DEFECTIVE)
NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

12.

CHECK CLIMATE CONTROL SEAT OPERATION (FRONT RH SEAT)

(a) Check the climate control seat operation again.

Click here

Result

Proceed to

Only seatback climate control blower RH does not operate

A

Only seat cushion climate control blower assembly RH does not operate

B

Both climate control blowers do not operate

C
B

REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY RH

C

GO TO STEP 16

A

13.

CHECK HARNESS AND CONNECTOR (SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY RH - SEATBACK CLIMATE CONTROL BLOWER RH)

(a) Disconnect the d1 seatback climate control blower RH connector.

(b) Disconnect the b7 seat cushion climate control blower assembly RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

b7-5 (VDD2) - d1-1 (VDD2)

Always

Below 1 Ω

b7-5 (VDD2) or d1-1 (VDD2) - Body ground

Always

10 kΩ or higher

b7-6 (SC2) - d1-3 (SC2)

Always

Below 1 Ω

b7-6 (SC2) or d1-3 (SC2) - Body ground

Always

10 kΩ or higher

d1-4 (GND2) - b7-4 (GND2)

Always

Below 1 Ω

d1-4 (GND2) or b7-4 (GND2) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

14.

REPLACE SEATBACK CLIMATE CONTROL BLOWER RH

(a) Temporarily replace the seatback climate control blower RH with a new or known good one.

Click here

NEXT

15.

CHECK CLIMATE CONTROL SEAT OPERATION

(a) Check the climate control operation again.

Click here

OK:

The climate control seat operates normally.

OK

END (SEATBACK CLIMATE CONTROL BLOWER RH WAS DEFECTIVE)
NG

REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY RH

16.

CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY RH - BODY GROUND)

(a) Disconnect the b7 seat cushion climate control blower assembly RH connector.

*a

Front view of wire harness connector

(to Seat Cushion Climate Control Blower Assembly LH)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

b7-1 (VDD1) - Body ground

Engine switch on (IG)

11 to 14 V

b7-1 (VDD1) - Body ground

Engine switch off

Below 1 V

Standard Resistance:

Tester Connection

Condition

Specified Condition

b7-8 (GND1) - Body ground

Always

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

17.

CHECK HARNESS AND CONNECTOR (SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY RH - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the J43 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

b7-7 (SC1) - J43-23 (ROUT)

Always

Below 1 Ω

b7-7 (SC1) or J43-23 (ROUT) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

18.

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

(a) Reconnect the J43 air conditioning amplifier assembly connector.

(b) Reconnect the b7 seat cushion climate control blower assembly RH connector.

*a

Component with harness connected

(Air Conditioning Amplifier Assembly)

(c) Check the input signal waveform.

Measurement Condition

Item

Content

Tester Connection

J43-23 (ROUT) - Body ground

Tool Setting

1 V/DIV., 1 ms/DIV.

Vehicle Condition
  • Engine switch on (IG)
  • Refreshing seat switch (for front RH side) on

    (blower position)

OK:

Waveform is similar to that shown in the illustration.

OK

REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY RH

NG

19.

REPLACE REFRESHING SEAT SWITCH (FOR FRONT SIDE)

(a) Temporarily replace the refreshing seat switch (for front side) with a new or known good one.

Click here

NEXT

20.

CHECK CLIMATE CONTROL SEAT OPERATION

(a) Check the climate control seat operation.

Click here

OK:

The climate control seat operates normally.

OK

END (REFRESHING SEAT SWITCH (FOR FRONT SIDE) WAS DEFECTIVE)
NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

21.

CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - REFRESHING SEAT SWITCH (FOR FRONT SIDE) - BODY GROUND)

(a) Disconnect the J82 refreshing seat switch (for front side) connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

J82-2 (IG) - Body ground

Engine switch on (IG)

11 to 14 V

J82-2 (IG) - Body ground

Engine switch off

Below 1 V

Standard Resistance:

Tester Connection

Condition

Specified Condition

J82-7 (E) - Body ground

Always

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

22.

REPLACE REFRESHING SEAT SWITCH (FOR FRONT SIDE)

(a) Temporarily replace the refreshing seat switch (for front side) with a new or known good one.

Click here

NEXT

23.

CHECK CLIMATE CONTROL SEAT OPERATION

(a) Check the climate control seat operation.

Click here

OK:

The climate control seat operates normally.

OK

END (REFRESHING SEAT SWITCH (FOR FRONT SIDE) WAS DEFECTIVE)
NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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