Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Rear Seat Belt Warning Light Malfunction

Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual / Vehicle Interior / Seat Belt / Seat Belt Warning System / Rear Seat Belt Warning Light Malfunction

DESCRIPTION

The main body ECU (multiplex network body ECU) detects whether either rear door is open or closed based on the condition of the left and right courtesy light switches and then sends the rear door status signal to the combination meter assembly. The combination meter assembly detects the rear seat belt state. The rear seat belt warning lights on the radio receiver assembly illuminate or turn off in accordance with the rear door state, vehicle speed and rear seat belt state.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • The seat belt warning system uses the CAN communication system. First, confirm that there are no malfunctions in the CAN communication system. Refer to the How to Proceed with Troubleshooting procedure.

    Click here

  • Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.

READ VALUE 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 / Main Body / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

RR Door Courtesy SW

Rear door courtesy light switch RH

ON or OFF

ON: Rear door RH open

OFF: Rear door RH closed

-

RL Door Courtesy SW

Rear door courtesy light switch LH

ON or OFF

ON: Rear door LH open

OFF: Rear door LH closed

-
Body Electrical > Main Body > Data List

Tester Display

RR Door Courtesy SW

RL Door Courtesy SW

OK:

The Techstream display changes correctly in response to the rear door condition.

NG

GO TO LIGHTING SYSTEM

OK

2.

CHECK REAR SEAT BELT WARNING

(a) Check the rear seat belt warning function.

Click here

Result

Proceed to

The rear seat belt warning lights (all seats) operate normally

A

The rear seat belt warning lights (all seats) do not operate normally

B

The rear seat belt warning light (RH) does not operate normally*1

C

The rear seat belt warning light (center) does not operate normally*1

D

The rear seat belt warning light (LH) does not operate normally*1

E

The rear seat belt warning light (rear No. 1 seat RH) does not operate normally*2

F

The rear seat belt warning light (rear No. 1 seat center) does not operate normally*3

G

The rear seat belt warning light (rear No. 1 seat LH) does not operate normally*2

H

The rear seat belt warning light (rear No. 2 seat RH) does not operate normally*2

I

The rear seat belt warning light (rear No. 2 seat LH) does not operate normally*2

J
  • *1: w/o Rear No. 2 Seat
  • *2: w/ Rear No. 2 Seat
  • *3: w/ Rear No. 2 Seat, for 60/40 Split Seat Type

*A

w/o Rear No. 2 Seat

*B

w/ Rear No. 2 Seat

*C

for 60/40 Split Seat Type

*1

Rear Seat Belt Warning Light (Radio Receiver Assembly)

*a

LH

*b

Center

*c

RH

*d

Rear No. 1 Seat LH

*e

Rear No. 1 Seat Center

*f

Rear No. 1 Seat RH

*g

Rear No. 2 Seat LH

*h

Rear No. 2 Seat RH
A

USE SIMULATION METHOD TO CHECK

C

GO TO STEP 7

D

GO TO STEP 12

E

GO TO STEP 18

F

GO TO STEP 23

G

GO TO STEP 28

H

GO TO STEP 33

I

GO TO STEP 38

J

GO TO STEP 43

B

3.

CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - RADIO RECEIVER ASSEMBLY)

(a) Disconnect the J151*1 or J147*2 radio receiver assembly connector.

  • *1: w/ 12.3 Inch Display
  • *2: w/o 12.3 Inch Display

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

Standard Voltage:

w/ 12.3 Inch Display

Tester Connection

Condition

Specified Condition

J151-19 (IG) - Body ground

Engine switch on (IG)

11 to 14 V

J151-19 (IG) - Body ground

Engine switch off

Below 1 V
w/o 12.3 Inch Display

Tester Connection

Condition

Specified Condition

J147-19 (IG) - Body ground

Engine switch on (IG)

11 to 14 V

J147-19 (IG) - Body ground

Engine switch off

Below 1 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - COMBINATION METER ASSEMBLY)

(a) Reconnect the J151*1 or J147*2 radio receiver assembly connector.

  • *1: w/ 12.3 Inch Display
  • *2: w/o 12.3 Inch Display

(b) Disconnect the J10 combination meter assembly connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

J10-35 (RLMT) - Body ground

Engine switch on (IG)

11 to 14 V

J10-36 (RCMT) - Body ground*1

Engine switch on (IG)

11 to 14 V

J10-37 (RRMT) - Body ground

Engine switch on (IG)

11 to 14 V

J10-32 (L) - Body ground*2

Engine switch on (IG)

11 to 14 V

J10-33 (SW) - Body ground*2

Engine switch on (IG)

11 to 14 V
  • *1: for 60/40 Split Seat Type

    *2: w/ Rear No. 2 Seat

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

REPLACE RADIO RECEIVER ASSEMBLY

(a) Temporarily replace the radio receiver assembly with a new or known good one.

Click here

NEXT

6.

CHECK REAR SEAT BELT WARNING

(a) Check the rear seat belt warning function.

Click here

OK:

The rear seat belt warning lights (all seats) operate normally.

*A

w/o Rear No. 2 Seat

*B

w/ Rear No. 2 Seat

*C

for 60/40 Split Seat Type

*1

Rear Seat Belt Warning Light (Radio Receiver Assembly)

*a

LH

*b

Center

*c

RH

*d

Rear No. 1 Seat LH

*e

Rear No. 1 Seat Center

*f

Rear No. 1 Seat RH

*g

Rear No. 2 Seat LH

*h

Rear No. 2 Seat RH
OK

END (RADIO RECEIVER ASSEMBLY WAS DEFECTIVE)
NG

REPLACE COMBINATION METER ASSEMBLY

7.

READ VALUE 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 / Combination Meter / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Combination Meter > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

2nd-Row Seatbelt Buckle (R)

Rear RH seat belt buckle switch signal

ON or OFF

OFF: Rear RH seat belt fastened

ON: Rear RH seat belt not fastened

-
Body Electrical > Combination Meter > Data List

Tester Display

2nd-Row Seatbelt Buckle (R)

Result

Proceed to

ON or OFF does not appear on the Techstream screen according to the rear seat belt condition

A

ON or OFF appears on the Techstream screen according to the rear seat belt condition

B
B

GO TO STEP 9

A

8.

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - REAR SEAT 3 POINT TYPE BELT ASSEMBLY RH - BODY GROUND)

(a) Disconnect the J10 combination meter assembly connector.

(b) Disconnect the R49 rear seat 3 point type belt assembly RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J10-12 (RRSB) - R49-1 (RBR+)

Always

Below 1 Ω

J10-12 (RRSB) or R49-1 (RBR+) - Body ground

Always

10 kΩ or higher

R49-2 (RBR-) - Body ground

Always

Below 1 Ω
OK

REPLACE REAR SEAT 3 POINT TYPE BELT ASSEMBLY RH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - RADIO RECEIVER ASSEMBLY)

(a) Disconnect the J10 combination meter assembly connector.

(b) Disconnect the J137 radio receiver assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J10-37 (RRMT) - J137-3 (RRID)

Always

Below 1 Ω

J10-37 (RRMT) or J137-3 (RRID) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

10.

REPLACE RADIO RECEIVER ASSEMBLY

(a) Temporarily replace the radio receiver assembly with a new or known good one.

Click here

NEXT

11.

CHECK REAR SEAT BELT WARNING

(a) Check the rear seat belt warning function.

Click here

OK:

The rear seat belt warning light (RH) operates normally.

*1

Rear Seat Belt Warning Light (Radio Receiver Assembly)

*a

LH

*b

Center

*c

RH
OK

END (RADIO RECEIVER ASSEMBLY WAS DEFECTIVE)
NG

REPLACE COMBINATION METER ASSEMBLY

12.

READ VALUE 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 / Combination Meter / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Combination Meter > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

2nd-Row Seatbelt Buckle (C)

Rear center seat belt buckle switch signal

ON or OFF

OFF: Rear center seat belt fastened

ON: Rear center seat belt not fastened

-
Body Electrical > Combination Meter > Data List

Tester Display

2nd-Row Seatbelt Buckle (C)

Result

Proceed to

ON or OFF does not appear on the Techstream screen according to the rear seat belt condition

A

ON or OFF appears on the Techstream screen according to the rear seat belt condition

B
B

GO TO STEP 15

A

13.

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - REAR SEAT INNER BELT ASSEMBLY LH - BODY GROUND)

(a) Disconnect the J10 combination meter assembly connector.

(b) Disconnect the S85 rear seat inner belt assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J10-13 (RCSB) - S85-1 (CBR+)

Always

Below 1 Ω

J10-13 (RCSB) or S85-1 (CBR+) - Body ground

Always

10 kΩ or higher

S85-2 (CBR-) - Body ground

Always

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

14.

INSPECT REAR SEAT INNER BELT ASSEMBLY LH

(a) Remove the rear seat inner belt assembly LH.

Click here

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

S85-1 - B-2

Always

Below 1 Ω

S85-2 - B-1

Always

Below 1 Ω
OK

REPLACE REAR CENTER SEAT INNER BELT ASSEMBLY

NG

REPLACE REAR SEAT INNER BELT ASSEMBLY LH

15.

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - RADIO RECEIVER ASSEMBLY)

(a) Disconnect the J10 combination meter assembly connector.

(b) Disconnect the J137 radio receiver assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J10-36 (RCMT) - J137-4 (RCID)

Always

Below 1 Ω

J10-36 (RCMT) or J137-4 (RCID) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

16.

REPLACE RADIO RECEIVER ASSEMBLY

(a) Temporarily replace the radio receiver assembly with a new or known good one.

Click here

NEXT

17.

CHECK REAR SEAT BELT WARNING

(a) Check the rear seat belt warning function.

Click here

OK:

The rear seat belt warning light (center) operates normally.

*1

Rear Seat Belt Warning Light (Radio Receiver Assembly)

*a

LH

*b

Center

*c

RH
OK

END (RADIO RECEIVER ASSEMBLY WAS DEFECTIVE)
NG

REPLACE COMBINATION METER ASSEMBLY

18.

READ VALUE 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 / Combination Meter / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Combination Meter > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

2nd-Row Seatbelt Buckle (L)

Rear LH seat belt buckle switch signal

ON or OFF

OFF: Rear LH seat belt fastened

ON: Rear LH seat belt not fastened

-
Body Electrical > Combination Meter > Data List

Tester Display

2nd-Row Seatbelt Buckle (L)

Result

Proceed to

ON or OFF does not appear on the Techstream screen according to the rear seat belt condition

A

ON or OFF appears on the Techstream screen according to the rear seat belt condition

B
B

GO TO STEP 20

A

19.

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - REAR SEAT INNER BELT ASSEMBLY LH - BODY GROUND)

(a) Disconnect the J10 combination meter assembly connector.

(b) Disconnect the S85 rear seat inner belt assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J10-14 (RLSB) - S85-3 (LBR+)

Always

Below 1 Ω

J10-14 (RLSB) or S85-3 (LBR+) - Body ground

Always

10 kΩ or higher

S85-4 (LBR-) - Body ground

Always

Below 1 Ω
OK

REPLACE REAR SEAT INNER BELT ASSEMBLY LH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

20.

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - RADIO RECEIVER ASSEMBLY)

(a) Disconnect the J10 combination meter assembly connector.

(b) Disconnect the J137 radio receiver assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J10-35 (RLMT) - J137-5 (RLID)

Always

Below 1 Ω

J10-35 (RLMT) or J137-5 (RLID) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

21.

REPLACE RADIO RECEIVER ASSEMBLY

(a) Temporarily replace the radio receiver assembly with a new or known good one.

Click here

NEXT

22.

CHECK REAR SEAT BELT WARNING

(a) Check the rear seat belt warning function.

Click here

OK:

The rear seat belt warning light (LH) operates normally.

*1

Rear Seat Belt Warning Light (Radio Receiver Assembly)

*a

LH

*b

Center

*c

RH
OK

END (RADIO RECEIVER ASSEMBLY WAS DEFECTIVE)
NG

REPLACE COMBINATION METER ASSEMBLY

23.

READ VALUE 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 / Combination Meter / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Combination Meter > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

2nd-Row Seatbelt Buckle (R)

Rear No. 1 RH seat belt buckle switch signal

ON or OFF

OFF: Rear No. 1 RH seat belt fastened

ON: Rear No. 1 RH seat belt not fastened

-
Body Electrical > Combination Meter > Data List

Tester Display

2nd-Row Seatbelt Buckle (R)

Result

Proceed to

ON or OFF does not appear on the Techstream screen according to the rear No. 1 seat belt condition

A

ON or OFF appears on the Techstream screen according to the rear No. 1 seat belt condition

B
B

GO TO STEP 25

A

24.

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - REAR SEAT 3 POINT TYPE BELT ASSEMBLY RH - BODY GROUND)

(a) Disconnect the J10 combination meter assembly connector.

(b) Disconnect the x8 rear seat 3 point type belt assembly RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J10-12 (RRSB) - x8-1

Always

Below 1 Ω

J10-12 (RRSB) or x8-1 - Body ground

Always

10 kΩ or higher

x8-2 - Body ground

Always

Below 1 Ω
OK

REPLACE REAR SEAT 3 POINT TYPE BELT ASSEMBLY RH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

25.

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - RADIO RECEIVER ASSEMBLY)

(a) Disconnect the J10 combination meter assembly connector.

(b) Disconnect the J137 radio receiver assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J10-37 (RRMT) - J137-3 (RRID)

Always

Below 1 Ω

J10-37 (RRMT) or J137-3 (RRID) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

26.

REPLACE RADIO RECEIVER ASSEMBLY

(a) Temporarily replace the radio receiver assembly with a new or known good one.

Click here

NEXT

27.

CHECK REAR SEAT BELT WARNING

(a) Check the rear seat belt warning function.

Click here

OK:

The rear seat belt warning light (rear No. 1 seat RH) operates normally.

*A

for 60/40 Split Seat Type

*1

Rear Seat Belt Warning Light (Radio Receiver Assembly)

*a

Rear No. 1 Seat LH

*b

Rear No. 1 Seat Center

*c

Rear No. 1 Seat RH

*d

Rear No. 2 Seat LH

*e

Rear No. 2 Seat RH
OK

END (RADIO RECEIVER ASSEMBLY WAS DEFECTIVE)
NG

REPLACE COMBINATION METER ASSEMBLY

28.

READ VALUE 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 / Combination Meter / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Combination Meter > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

2nd-Row Seatbelt Buckle (C)

Rear No. 1 center seat belt buckle switch signal

ON or OFF

OFF: Rear No. 1 center seat belt fastened

ON: Rear No. 1 center seat belt not fastened

-
Body Electrical > Combination Meter > Data List

Tester Display

2nd-Row Seatbelt Buckle (C)

Result

Proceed to

ON or OFF does not appear on the Techstream screen according to the rear No. 1 seat belt condition

A

ON or OFF appears on the Techstream screen according to the rear No. 1 seat belt condition

B
B

GO TO STEP 30

A

29.

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - REAR CENTER SEAT INNER BELT ASSEMBLY - BODY GROUND)

(a) Disconnect the J10 combination meter assembly connector.

(b) Disconnect the x11 rear center seat inner belt assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J10-13 (RCSB) - x11-1

Always

Below 1 Ω

J10-13 (RCSB) or x11-1 - Body ground

Always

10 kΩ or higher

x11-2 - Body ground

Always

Below 1 Ω
OK

REPLACE REAR CENTER SEAT INNER BELT ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

30.

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - RADIO RECEIVER ASSEMBLY)

(a) Disconnect the J10 combination meter assembly connector.

(b) Disconnect the J137 radio receiver assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J10-36 (RCMT) - J137-4 (RCID)

Always

Below 1 Ω

J10-36 (RCMT) or J137-4 (RCID) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

31.

REPLACE RADIO RECEIVER ASSEMBLY

(a) Temporarily replace the radio receiver assembly with a new or known good one.

Click here

NEXT

32.

CHECK REAR SEAT BELT WARNING

(a) Check the rear seat belt warning function.

Click here

OK:

The rear seat belt warning light (rear No. 1 seat center) operates normally.

*A

for 60/40 Split Seat Type

*1

Rear Seat Belt Warning Light (Radio Receiver Assembly)

*a

Rear No. 1 Seat LH

*b

Rear No. 1 Seat Center

*c

Rear No. 1 Seat RH

*d

Rear No. 2 Seat LH

*e

Rear No. 2 Seat RH
OK

END (RADIO RECEIVER ASSEMBLY WAS DEFECTIVE)
NG

REPLACE COMBINATION METER ASSEMBLY

33.

READ VALUE 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 / Combination Meter / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Combination Meter > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

2nd-Row Seatbelt Buckle (L)

Rear No. 1 LH seat belt buckle switch signal

ON or OFF

OFF: Rear No. 1 LH seat belt fastened

ON: Rear No. 1 LH seat belt not fastened

-
Body Electrical > Combination Meter > Data List

Tester Display

2nd-Row Seatbelt Buckle (L)

Result

Proceed to

ON or OFF does not appear on the Techstream screen according to the rear No. 1 seat belt condition

A

ON or OFF appears on the Techstream screen according to the rear No. 1 seat belt condition

B
B

GO TO STEP 35

A

34.

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - REAR SEAT INNER BELT ASSEMBLY LH - BODY GROUND)

(a) Disconnect the J10 combination meter assembly connector.

(b) Disconnect the y8 rear seat inner belt assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J10-14 (RLSB) - y8-1

Always

Below 1 Ω

J10-14 (RLSB) or y8-1 - Body ground

Always

10 kΩ or higher

y8-2 - Body ground

Always

Below 1 Ω
OK

REPLACE REAR SEAT INNER BELT ASSEMBLY LH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

35.

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - RADIO RECEIVER ASSEMBLY)

(a) Disconnect the J10 combination meter assembly connector.

(b) Disconnect the J137 radio receiver assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J10-35 (RLMT) - J137-5 (RLID)

Always

Below 1 Ω

J10-35 (RLMT) or J137-5 (RLID) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

36.

REPLACE RADIO RECEIVER ASSEMBLY

(a) Temporarily replace the radio receiver assembly with a new or known good one.

Click here

NEXT

37.

CHECK REAR SEAT BELT WARNING

(a) Check the rear seat belt warning function.

Click here

OK:

The rear seat belt warning light (rear No. 1 seat LH) operates normally.

*A

for 60/40 Split Seat Type

*1

Rear Seat Belt Warning Light (Radio Receiver Assembly)

*a

Rear No. 1 Seat LH

*b

Rear No. 1 Seat Center

*c

Rear No. 1 Seat RH

*d

Rear No. 2 Seat LH

*e

Rear No. 2 Seat RH
OK

END (RADIO RECEIVER ASSEMBLY WAS DEFECTIVE)
NG

REPLACE COMBINATION METER ASSEMBLY

38.

READ VALUE 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 / Combination Meter / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Combination Meter > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

3rd-Row Seatbelt Buckle (R)

Rear No. 2 RH seat belt buckle switch signal

ON or OFF

OFF: Rear No. 2 RH seat belt fastened

ON: Rear No. 2 RH seat belt not fastened

-
Body Electrical > Combination Meter > Data List

Tester Display

3rd-Row Seatbelt Buckle (R)

Result

Proceed to

ON or OFF does not appear on the Techstream screen according to the rear No. 2 seat belt condition

A

ON or OFF appears on the Techstream screen according to the rear No. 2 seat belt condition

B
B

GO TO STEP 40

A

39.

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - REAR NO. 2 SEAT INNER BELT ASSEMBLY RH - BODY GROUND)

(a) Disconnect the J10 combination meter assembly connector.

(b) Disconnect the x12 rear No. 2 seat inner belt assembly RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J10-6 (RRBT) - x12-1

Always

Below 1 Ω

J10-6 (RRBT) or x12-1 - Body ground

Always

10 kΩ or higher

x12-2 - Body ground

Always

Below 1 Ω
OK

REPLACE REAR NO. 2 SEAT INNER BELT ASSEMBLY RH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

40.

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - RADIO RECEIVER ASSEMBLY)

(a) Disconnect the J10 combination meter assembly connector.

(b) Disconnect the J137 radio receiver assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J10-33 (SW) - J137-1 (LAPB)

Always

Below 1 Ω

J10-33 (SW) or J137-1 (LAPB) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

41.

REPLACE RADIO RECEIVER ASSEMBLY

(a) Temporarily replace the radio receiver assembly with a new or known good one.

Click here

for Navigation System: Click here

NEXT

42.

CHECK REAR SEAT BELT WARNING

(a) Check the rear seat belt warning function.

Click here

OK:

The rear seat belt warning light (rear No. 2 seat RH) operates normally.

*A

for 60/40 Split Seat Type

*1

Rear Seat Belt Warning Light (Radio Receiver Assembly)

*a

Rear No. 1 Seat LH

*b

Rear No. 1 Seat Center

*c

Rear No. 1 Seat RH

*d

Rear No. 2 Seat LH

*e

Rear No. 2 Seat RH
OK

END (RADIO RECEIVER ASSEMBLY WAS DEFECTIVE)
NG

REPLACE COMBINATION METER ASSEMBLY

43.

READ VALUE 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 / Combination Meter / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Combination Meter > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

3rd-Row Seatbelt Buckle (L)

Rear No. 2 LH seat belt buckle switch signal

ON or OFF

OFF: Rear No. 2 LH seat belt fastened

ON: Rear No. 2 LH seat belt not fastened

-
Body Electrical > Combination Meter > Data List

Tester Display

3rd-Row Seatbelt Buckle (L)

Result

Proceed to

ON or OFF does not appear on the Techstream screen according to the rear No. 2 seat belt condition

A

ON or OFF appears on the Techstream screen according to the rear No. 2 seat belt condition

B
B

GO TO STEP 45

A

44.

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - REAR NO. 2 SEAT INNER BELT ASSEMBLY LH - BODY GROUND)

(a) Disconnect the J10 combination meter assembly connector.

(b) Disconnect the y12 rear No. 2 seat inner belt assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J10-8 (RLBT) - y12-1

Always

Below 1 Ω

J10-8 (RLBT) or y12-1 - Body ground

Always

10 kΩ or higher

y12-2 - Body ground

Always

Below 1 Ω
OK

REPLACE REAR NO. 2 SEAT INNER BELT ASSEMBLY LH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

45.

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - RADIO RECEIVER ASSEMBLY)

(a) Disconnect the J10 combination meter assembly connector.

(b) Disconnect the J137 radio receiver assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J10-32 (L) - J137-2 (LAPL)

Always

Below 1 Ω

J10-32 (L) or J137-2 (LAPL) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

46.

REPLACE RADIO RECEIVER ASSEMBLY

(a) Temporarily replace the radio receiver assembly with a new or known good one.

Click here

NEXT

47.

CHECK REAR SEAT BELT WARNING

(a) Check the rear seat belt warning function.

Click here

OK:

The rear seat belt warning light (rear No. 2 seat LH) operates normally.

*A

for 60/40 Split Seat Type

*1

Rear Seat Belt Warning Light (Radio Receiver Assembly)

*a

Rear No. 1 Seat LH

*b

Rear No. 1 Seat Center

*c

Rear No. 1 Seat RH

*d

Rear No. 2 Seat LH

*e

Rear No. 2 Seat RH
OK

END (RADIO RECEIVER ASSEMBLY WAS DEFECTIVE)
NG

REPLACE COMBINATION METER ASSEMBLY

    Front Passenger Side Seat Belt Warning Light Malfunction
    DESCRIPTION When the engine switch is turned on (IG), the occupant detection ECU sends signals to the airbag sensor assembly to indicate the state of the front seat inner belt assembly RH and also whe ...

    Tongue Plate Stopper
    ComponentsCOMPONENTS ILLUSTRATION *1 TONGUE PLATE STOPPER - - ● Non-reusable part - - ReplacementREPLACEMENT PROCEDURE 1. REMOVE TONGUE PLATE STOPPER (a) Slide the tongue p ...

    Other materials:

    Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual > 4wd Control Ecu: Components
    COMPONENTS ILLUSTRATION *1 4WD ECU ASSEMBLY *2 COWL SIDE TRIM BOARD RH *3 FRONT DOOR SCUFF PLATE RH *4 NO. 2 INSTRUMENT PANEL UNDER COVER SUB-ASSEMBLY N*m (kgf*cm, ft.*lbf): Specified torque - - ...

    Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual > Mirror (ext): Outer Mirror Switch
    ComponentsCOMPONENTS ILLUSTRATION *1 MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY *2 MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY WITH FRONT DOOR UPPER ARMREST BASE PANEL ...

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

    © 2024 Copyright www.lexusrx.net
    0.021