Rear Air Massage Function does not Operate [10/2017 - ]: Procedure

CHECK MALFUNCTIONING PARTS

Check the problem symptoms.

Result

Result	Proceed to
Rear seat RH malfunctioning	A
Rear seat LH malfunctioning	B

Result:

See step 13

Result:

See step 2

CHECK MALFUNCTIONING PARTS, COMPONENT AND AREA

Check that each function of the refreshing seat operates normally.

Result

Result	Proceed to
All refreshing functions do not operate	A
One or more refreshing functions do not operate	B

Result:

See step 12

Result:

See step 3

READ VALUE USING TECHSTREAM (REAR BUCKLE SWITCH, OCCUPANT SENSOR, RELAXTION SWITCH SIGNAL)

Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Turn the Techstream on.
Enter the following menus: Body Electrical / Rear Right Seat / Data List.

Read the Data List according to the display on the Techstream.

Body Electrical > Rear Right Seat > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Rear Buckle Switch	Rear RH seat belt signal	ON/OFF	ON: Rear RH seat belt fastened OFF: Rear RH seat belt unfastened	-
Occupant Sensor	Occupant detection sensor signal	ON/OFF	ON: Rear RH seat occupied OFF: Rear RH seat not occupied	-
Relaxation Switch Signal	Relaxation switch signal	ON/OFF	ON: Touch "Relaxation" OFF: Not touch "Relaxation"	-

Body Electrical > Rear Right Seat > Data List

Tester Display
Rear Buckle Switch
Occupant Sensor
Relaxation Switch Signal

ON or OFF is displayed on the Techstream according to the table above.

Result

Result	Proceed to
OK	A
NG (Item: Rear Buckle Switch)	B
NG (Item: Occupant Sensor)	C
NG (Item: Relaxation Switch Signal)	D

Result:

See step 8

Result:

See step 10

Result:

GO TO REAR MULTI OPERATION PANEL SYSTEM. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 10/2023] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2023 - ]

Result:

See step 4

INSPECT LUMBAR SUPPORT PUMP SUB-ASSEMBLY RH

Remove the lumbar support pump sub-assembly RH.
Refer to REMOVAL [10/2017 - 09/2018] , or refer to REMOVAL [09/2018 - 10/2020] , or refer to REMOVAL [10/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

Inspect the lumbar support pump sub-assembly RH.

Refer to INSPECTION [10/2017 - ]

Result

Proceed to
OK
NG

Result:

REPLACE LUMBAR SUPPORT PUMP SUB-ASSEMBLY RH. Refer to REMOVAL [10/2017 - 09/2018] , or refer to REMOVAL [09/2018 - 10/2020] , or refer to REMOVAL [10/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

Result:

See step 5

CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY RH - LUMBAR SUPPORT PUMP SUB-ASSEMBLY RH)

Disconnect the R6 position control ECU assembly RH connector.
Disconnect the R17 lumbar support pump sub-assembly RH connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
R6-10 (POM) - R17-1	Always	Below 1 Ω
R6-11 (POMG) - R17-2	Always	Below 1 Ω
R6-10 (POM) or R17-1 - Other terminals and body ground	Always	10 kΩ or higher
R6-11 (POMG or R17-2 - Other terminals and body ground	Always	10 kΩ or higher

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

See step 6

CHECK HARNESS AND CONNECTOR (SEAT CHECK VALVE RH - BATTERY AND BODY GROUND)

Disconnect the R12 No. 1 seatback check with hose valve RH connector.
Disconnect the R13 No. 2 seatback check with hose valve RH connector.
Disconnect the T3 seat cushion check with hose valve RH connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
R12-1 (GND) - Body ground	Always	Below 1 Ω
R13-1 (GND) - Body ground	Always	Below 1 Ω
T3-1 (GND) - Body ground	Always	Below 1 Ω

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

Standard Voltage

Tester Connection	Condition	Specified Condition
R12-3 (SYSB) - Body ground	Power switch off	11 to 14 V
R13-3 (SYSB) - Body ground	Power switch off	11 to 14 V
T3-3 (SYSB) - Body ground	Power switch off	11 to 14 V

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

See step 7

CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY RH - SEAT CHECK VALVE RH)

Disconnect the R6 No. 1 position control ECU assembly RH connector.
Disconnect the R12 No. 1 seatback check with hose valve RH connector.
Disconnect the R13 No. 2 seatback check with hose valve RH connector.
Disconnect the T3 seat cushion check with hose valve RH connector.
Disconnect the R11 seatback check with bracket valve RH connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
R41-2 (LINM) - R12-5 (LIN)	Always	Below 1 Ω
R41-2 (LINM) - R13-5 (LIN)	Always	Below 1 Ω
R41-2 (LINM) - T3-5 (LIN)	Always	Below 1 Ω
R41-2 (LINM) or R12-5 (LIN) - Other terminals and body ground	Always	10 kΩ or higher
R41-2 (LINM) or R13-5 (LIN) - Other terminals and body ground	Always	10 kΩ or higher
R41-2 (LINM) or T3-5 (LIN) - Other terminals and body ground	Always	10 kΩ or higher

Result

Proceed to
OK
NG

Result:

REPLACE POSITION CONTROL ECU ASSEMBLY RH. Refer to REMOVAL [10/2017 - 09/2018] , or refer to REMOVAL [09/2018 - 10/2020] , or refer to REMOVAL [10/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

INSPECT REAR SEAT INNER BELT ASSEMBLY RH

Remove the rear seat inner belt assembly RH.
Refer to REMOVAL [10/2017 - 09/2018] , or refer to REMOVAL [09/2018 - 10/2020] , or refer to REMOVAL [10/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

Inspect the rear seat inner belt assembly RH.

Refer to INSPECTION [10/2017 - ]

Result

Proceed to
OK
NG

Result:

REPLACE REAR SEAT INNER BELT ASSEMBLY RH. Refer to REMOVAL [10/2017 - 09/2018] , or refer to REMOVAL [09/2018 - 10/2020] , or refer to REMOVAL [10/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

Result:

See step 9

CHECK HARNESS AND CONNECTOR (REAR SEAT INNER BELT ASSEMBLY RH - POSITION CONTROL ECU ASSEMBLY RH)

Disconnect the R24 rear seat inner belt assembly RH connector.
Disconnect the R7 position control ECU assembly RH connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
R24-10 - R7-3 (BCL1)	Always	Below 1 Ω
R24-4 - Body ground	Always	Below 1 Ω
R24-10 or R7-3 (BCL1) - Other terminals and body ground	Always	10 kΩ or higher

Result

Proceed to
OK
NG

Result:

INSPECT REAR SEAT CUSHION PAD RH (OCCUPANT DETECTION SENSOR)

Remove the rear seat cushion pad RH (occupant detection sensor).
Refer to REMOVAL [10/2017 - 09/2018] , or refer to REMOVAL [09/2018 - 10/2020] , or refer to REMOVAL [10/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

Inspect the rear seat cushion pad RH (occupant detection sensor).

Refer to INSPECTION [10/2017 - ]

Result

Proceed to
OK
NG

Result:

REPLACE REAR SEAT CUSHION PAD RH. Refer to REMOVAL [10/2017 - 09/2018] , or refer to REMOVAL [09/2018 - 10/2020] , or refer to REMOVAL [10/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

Result:

See step 11

CHECK HARNESS AND CONNECTOR (REAR SEAT CUSHION PAD RH - POSITION CONTROL ECU ASSEMBLY RH)

Disconnect the T4 rear seat cushion pad RH connector.
Disconnect the R7 position control ECU assembly RH connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
T4-3 (ZJK) - R7-17 (ODS)	Always	Below 1 Ω
T4-1 (QD2) - Body ground	Always	Below 1 Ω
T4-3 (ZJK) or R7-17 (ODS) - Other terminals and body ground	Always	10 kΩ or higher

Result

Proceed to
OK
NG

Result:

PERFORM ACTIVE TEST USING TECHSTREAM

Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Turn the Techstream on.
Enter the following menus: Body Electrical / Rear Right Seat / Active Test.

Perform the Active Test according to the display on the Techstream.

Body Electrical > Rear Right Seat > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Refresh BL1	Seatback bladder assembly	OFF/ON	-
Refresh BL2	Seatback bladder assembly	OFF/ON	-
Refresh BL3	Seatback bladder assembly	OFF/ON	-
Refresh BL4	Seatback bladder assembly	OFF/ON	-
Refresh BL5	Seatback bladder assembly	OFF/ON	-
Refresh BR1	Seatback bladder assembly	OFF/ON	-
Refresh BR2	Seatback bladder assembly	OFF/ON	-
Refresh BR3	Seatback bladder assembly	OFF/ON	-
Refresh BR4	Seatback bladder assembly	OFF/ON	-
Refresh BR5	Seatback bladder assembly	OFF/ON	-
Refresh C1	Seat cushion bladder assembly	OFF/ON	-
Refresh C2	Seat cushion bladder assembly	OFF/ON	-
Refresh C5	Seat cushion bladder assembly	OFF/ON	-
Refresh C4	Seat cushion bladder assembly	OFF/ON	-
Refresh C3	Seat cushion bladder assembly	OFF/ON	-

Body Electrical > Rear Right Seat > Active Test

Tester Display
Refresh BL1

Body Electrical > Rear Right Seat > Active Test

Tester Display
Refresh BL2

Body Electrical > Rear Right Seat > Active Test

Tester Display
Refresh BL3

Body Electrical > Rear Right Seat > Active Test

Tester Display
Refresh BL4

Body Electrical > Rear Right Seat > Active Test

Tester Display
Refresh BL5

Body Electrical > Rear Right Seat > Active Test

Tester Display
Refresh BR1

Body Electrical > Rear Right Seat > Active Test

Tester Display
Refresh BR2

Body Electrical > Rear Right Seat > Active Test

Tester Display
Refresh BR3

Body Electrical > Rear Right Seat > Active Test

Tester Display
Refresh BR4

Body Electrical > Rear Right Seat > Active Test

Tester Display
Refresh BR5

Body Electrical > Rear Right Seat > Active Test

Tester Display
Refresh C1

Body Electrical > Rear Right Seat > Active Test

Tester Display
Refresh C2

Body Electrical > Rear Right Seat > Active Test

Tester Display
Refresh C5

Body Electrical > Rear Right Seat > Active Test

Tester Display
Refresh C4

Body Electrical > Rear Right Seat > Active Test

Tester Display
Refresh C3

Result

Proceed
NEXT

Result:

CHECK REFRESHING SEAT

Refer to PARTS LOCATION [10/2017 - ]

Refer to INSPECTION [10/2017 - ]

Refer to REPAIR [10/2017 - ]

CHECK MALFUNCTIONING PARTS, COMPONENT AND AREA

Check that each function of the refreshing seat operates normally.

Result

Result	Proceed to
All refreshing functions do not operate	A
One or more refreshing functions do not operate	B

Result:

See step 23

Result:

See step 14

READ VALUE USING TECHSTREAM (REAR BUCKLE SWITCH, OCCUPANT SENSOR, RELAXTION SWITCH SIGNAL)

Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Turn the Techstream on.
Enter the following menus: Body Electrical / Rear Left Seat / Data List.

Read the Data List according to the display on the Techstream.

Body Electrical > Rear Left Seat > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Rear Buckle Switch	Rear LH seat belt signal	ON/OFF	ON: Rear LH seat belt fastened OFF: Rear LH seat belt unfastened	-
Occupant Sensor	Occupant detection sensor signal	ON/OFF	ON: Rear LH seat occupied OFF: Rear LH seat not occupied	-
Relaxation Switch Signal	Relaxation switch signal	ON/OFF	ON: Touch "Relaxation" OFF: Not touch "Relaxation"	-

Body Electrical > Rear Left Seat > Data List

Tester Display
Rear Buckle Switch
Occupant Sensor
Relaxation Switch Signal

ON or OFF is displayed on the Techstream according to the table above.

Result

Result	Proceed to
OK	A
NG (Item: Rear Buckle Switch)	B
NG (Item: Occupant Sensor)	C
NG (Item: Relaxation Switch Signal)	D

Result:

See step 19

Result:

See step 21

Result:

GO TO REAR MULTI OPERATION PANEL SYSTEM. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 10/2023] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2023 - ]

Result:

See step 15

INSPECT LUMBAR SUPPORT PUMP SUB-ASSEMBLY LH

Remove the lumbar support pump sub-assembly LH.
Refer to REMOVAL [10/2017 - 09/2018] , or refer to REMOVAL [09/2018 - 10/2020] , or refer to REMOVAL [10/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

Inspect the lumbar support pump sub-assembly LH.

Refer to INSPECTION [10/2017 - ]

Result

Proceed to
OK
NG

Result:

See step 16

CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY LH - LUMBAR SUPPORT PUMP SUB-ASSEMBLY LH)

Disconnect the R40 position control ECU assembly LH connector.
Disconnect the R48 lumbar support pump sub-assembly LH connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
R40-10 (POM) - R48-1	Always	Below 1 Ω
R40-11 (POMG) - R48-2	Always	Below 1 Ω
R40-10 (POM) or R48-1 - Other terminals and body ground	Always	10 kΩ or higher
R40-11 (POMG or R48-2 - Other terminals and body ground	Always	10 kΩ or higher

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

See step 17

CHECK HARNESS AND CONNECTOR (SEAT CHECK VALVE LH - BATTERY AND BODY GROUND)

Disconnect the R45 No. 1 seatback check with hose valve LH connector.
Disconnect the R47 No. 2 seatback check with hose valve LH connector.
Disconnect the T10 seat cushion check with hose valve LH connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
R45-1 (GND) - Body ground	Always	Below 1 Ω
R47-1 (GND) - Body ground	Always	Below 1 Ω
T10-1 (GND) - Body ground	Always	Below 1 Ω

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

Standard Voltage

Tester Connection	Condition	Specified Condition
R45-3 (SYSB) - Body ground	Power switch off	11 to 14 V
R47-3 (SYSB) - Body ground	Power switch off	11 to 14 V
T10-3 (SYSB) - Body ground	Power switch off	11 to 14 V

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

See step 18

CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY LH - SEAT CHECK VALVE LH)

Disconnect the R41 No. 1 position control ECU assembly LH connector.
Disconnect the R45 No. 1 seatback check with hose valve LH connector.
Disconnect the R47 No. 2 seatback check with hose valve LH connector.
Disconnect the T10 seat cushion check with hose valve LH connector.
Disconnect the R44 seatback check with bracket valve LH connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
R41-2 (LINM) - R45-5 (LIN)	Always	Below 1 Ω
R41-2 (LINM) - R47-5 (LIN)	Always	Below 1 Ω
R41-2 (LINM) - T10-5 (LIN)	Always	Below 1 Ω
R41-2 (LINM) or R45-5 (LIN) - Other terminals and body ground	Always	10 kΩ or higher
R41-2 (LINM) or R47-5 (LIN) - Other terminals and body ground	Always	10 kΩ or higher
R41-2 (LINM) or T10-5 (LIN) - Other terminals and body ground	Always	10 kΩ or higher

Result

Proceed to
OK
NG

Result:

REPLACE POSITION CONTROL ECU ASSEMBLY LH. Refer to REMOVAL [10/2017 - 09/2018] , or refer to REMOVAL [09/2018 - 10/2020] , or refer to REMOVAL [10/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

INSPECT REAR SEAT NO. 1 INNER BELT ASSEMBLY LH

Remove the rear No. 1 seat inner belt assembly LH.
Refer to REMOVAL [10/2017 - 09/2018] , or refer to REMOVAL [09/2018 - 10/2020] , or refer to REMOVAL [10/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

Inspect the rear No. 1 seat inner belt assembly LH.

Refer to INSPECTION [10/2017 - ]

Result

Proceed to
OK
NG

Result:

See step 20

CHECK HARNESS AND CONNECTOR (REAR SEAT NO. 1 INNER BELT ASSEMBLY LH - POSITION CONTROL ECU ASSEMBLY LH)

Disconnect the R49 rear No. 1 seat inner belt assembly LH connector.
Disconnect the R41 position control ECU assembly LH connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
R49-10 - R41-3 (BCL1)	Always	Below 1 Ω
R49-4 - Body ground	Always	Below 1 Ω
R49-10 or R41-3 (BCL1) - Other terminals and body ground	Always	10 kΩ or higher

Result

Proceed to
OK
NG

Result:

REPLACE REAR SEAT NO. 1 INNER BELT ASSEMBLY LH. Refer to REMOVAL [10/2017 - 09/2018] , or refer to REMOVAL [09/2018 - 10/2020] , or refer to REMOVAL [10/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

INSPECT REAR SEAT CUSHION PAD LH (OCCUPANT DETECTION SENSOR)

Remove the rear seat cushion pad LH (occupant detection sensor).
Refer to REMOVAL [10/2017 - 09/2018] , or refer to REMOVAL [09/2018 - 10/2020] , or refer to REMOVAL [10/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

Inspect the rear seat cushion pad LH (occupant detection sensor).

Refer to INSPECTION [10/2017 - ]

Result

Proceed to
OK
NG

Result:

REPLACE REAR SEAT CUSHION PAD LH. Refer to REMOVAL [10/2017 - 09/2018] , or refer to REMOVAL [09/2018 - 10/2020] , or refer to REMOVAL [10/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

Result:

See step 22

CHECK HARNESS AND CONNECTOR (REAR SEAT CUSHION PAD LH - POSITION CONTROL ECU ASSEMBLY LH)

Disconnect the T11 rear seat cushion pad LH connector.
Disconnect the R41 position control ECU assembly LH connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
T11-3 (ZJK) - R41-17 (ODS)	Always	Below 1 Ω
T11-1 (QD2) - Body ground	Always	Below 1 Ω
T11-3 (ZJK) or R41-17 (ODS) - Other terminals and body ground	Always	10 kΩ or higher

Result

Proceed to
OK
NG

Result:

PERFORM ACTIVE TEST USING TECHSTREAM

Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Turn the Techstream on.
Enter the following menus: Body Electrical / Rear Left Seat / Active Test.

Perform the Active Test according to the display on the Techstream.