Toyota Avalon Service & Repair Manual: Climate Control Seat System does not Operate

DESCRIPTION

When the engine switch is on and the climate control switch is operated, the air conditioning amplifier assembly receives climate control switch position signals and then sends airflow amount signals to each seat cushion climate control blower.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • If the battery voltage becomes low, battery load control will operate in order to ensure sufficient power is supplied to the power steering system. In this case, the climate control seat system (for gasoline model) may not operate.
  • 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

PROCEDURE

1.

CHECK DTC OUTPUT

(a) Clear DTCs.

Body Electrical > Air Conditioner > Clear DTCs

(b) Check for DTCs.

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.

PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Air Conditioner / Active Test.

(e) 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

Front LH seat blower operation

OFF or ON

-

Body Electrical > Air Conditioner > Active Test

Tester Display

Front Left Seat Blower

OK:

The seat blower operates normally.

Result

Proceed to

Only seatback climate control blower LH does not operate

A

Only seat cushion climate control blower LH does not operate

B

Both seat blowers do not operate

C

B

REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER LH

C

GO TO STEP 7

A

4.

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

(a) Disconnect the a11 seatback climate control blower LH connector.

(b) Disconnect the R34 seat cushion climate control blower LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

a11-1 (CTB) - R34-5 (CTB)

Always

Below 1 Ω

a11-1 (CTB) or R34-5 (CTB) - Body ground

Always

10 kΩ or higher

a11-3 (BBS) - R34-6 (BBS)

Always

Below 1 Ω

a11-3 (BBS) or R34-6 (BBS) - Body ground

Always

10 kΩ or higher

a11-4 (BFB-) - R34-4 (BFB-)

Always

Below 1 Ω

a11-4 (BFB-) or R34-4 (BFB-) - 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 LH

7.

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

(a) Disconnect the R34 seat cushion climate control blower LH connector.

*a

Front view of wire harness connector

(to Seat Cushion Climate Control Blower LH)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

R34-1 (IG) - Body ground

Engine switch on (IG)

11 to 14 V

R34-1 (IG) - Body ground

Engine switch off

Below 1 V

Standard Resistance:

Tester Connection

Condition

Specified Condition

R34-8 (GND) - Body ground

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

8.

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

(a) Disconnect the G35 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

R34-7 (SIGN) - G35-24 (LOUT)

Always

Below 1 Ω

R34-7 (SIGN) or G35-24 (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 G35 air conditioning amplifier assembly connector.

(b) Reconnect the R34 seat cushion climate control blower LH connector.

*a

Component with harness connected

(Air Conditioning Amplifier Assembly)

(c) Using an oscilloscope, check the input signal waveform.

Measurement Condition

Item

Content

Tester Connection

G35-24 (LOUT) - Body ground

Tool Setting

1 V/DIV., 0.5 ms/DIV.

Vehicle Condition

  • Engine switch on (IG)
  • Climate control switch on

    (blower position)

OK:

Waveform is similar to that shown in the illustration.

OK

REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER LH

NG

10.

REPLACE CLIMATE CONTROL SWITCH (RADIO AND DISPLAY RECEIVER ASSEMBLY)

(a) Temporarily replace the climate control switch (radio and display receiver assembly) 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 (CLIMATE CONTROL SWITCH (RADIO AND DISPLAY RECEIVER ASSEMBLY) WAS DEFECTIVE)

NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

12.

PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Air Conditioner / Active Test.

(e) 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 Right Seat Blower

Front RH seat blower operation

OFF or ON

-

Body Electrical > Air Conditioner > Active Test

Tester Display

Front Right Seat Blower

OK:

The seat blower operates normally.

Result

Proceed to

Only seatback climate control blower RH does not operate

A

Only seat cushion climate control blower RH does not operate

B

Both seat blowers do not operate

C

B

REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER RH

C

GO TO STEP 16

A

13.

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

(a) Disconnect the a5 seatback climate control blower RH connector.

(b) Disconnect the R15 seat cushion climate control blower RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

R15-5 (CTB) - a5-1 (CTB)

Always

Below 1 Ω

R15-5 (CTB) or a5-1 (CTB) - Body ground

Always

10 kΩ or higher

R15-6 (BBS) - a5-3 (BBS)

Always

Below 1 Ω

R15-6 (BBS) or a5-3 (BBS) - Body ground

Always

10 kΩ or higher

a5-4 (BFB-) - R15-4 (BFB-)

Always

Below 1 Ω

a5-4 (BFB-) or R15-4 (BFB-) - 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 seat operation.

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 RH

16.

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

(a) Disconnect the R15 seat cushion climate control blower RH connector.

*a

Front view of wire harness connector

(to Seat Cushion Climate Control Blower RH)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

R15-1 (IG) - Body ground

Engine switch on (IG)

11 to 14 V

R15-1 (IG) - Body ground

Engine switch off

Below 1 V

Standard Resistance:

Tester Connection

Condition

Specified Condition

R15-8 (GND) - Body ground

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

17.

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

(a) Disconnect the G35 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

R15-7 (SIGN) - G35-23 (ROUT)

Always

Below 1 Ω

R15-7 (SIGN) or G35-23 (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 G35 air conditioning amplifier assembly connector.

(b) Reconnect the R15 seat cushion climate control blower RH connector.

*a

Component with harness connected

(Air Conditioning Amplifier Assembly)

(c) Using an oscilloscope, check the input signal waveform.

Measurement Condition

Item

Content

Tester Connection

G35-23 (ROUT) - Body ground

Tool Setting

1 V/DIV., 0.5 ms/DIV.

Vehicle Condition

  • Engine switch on (IG)
  • Climate control switch on

    (blower position)

OK:

Waveform is similar to that shown in the illustration.

OK

REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER RH

NG

19.

REPLACE CLIMATE CONTROL SWITCH (RADIO AND DISPLAY RECEIVER ASSEMBLY)

(a) Temporarily replace the climate control switch (radio and display receiver assembly) 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 (CLIMATE CONTROL SWITCH (RADIO AND DISPLAY RECEIVER ASSEMBLY) WAS DEFECTIVE)

NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

21.

CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - CLIMATE CONTROL SWITCH (RADIO AND DISPLAY RECEIVER ASSEMBLY) - BODY GROUND)

(a) Disconnect the G20 climate control switch (radio and display receiver assembly) connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

G20-2 (IG+) - Body ground

Engine switch on (IG)

11 to 14 V

G20-2 (IG+) - Body ground

Engine switch off

Below 1 V

Standard Resistance:

Tester Connection

Condition

Specified Condition

G20-6 (GND) - Body ground

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

22.

REPLACE CLIMATE CONTROL SWITCH (RADIO AND DISPLAY RECEIVER ASSEMBLY)

(a) Temporarily replace the climate control switch (radio and display receiver assembly) 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 (CLIMATE CONTROL SWITCH (RADIO AND DISPLAY RECEIVER ASSEMBLY) WAS DEFECTIVE)

NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    Climate Control Seat System(for Gasoline Model)

    Data List / Active Test

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