Lexus NX: Driver Side Seat Belt Warning Light does not Operate
DESCRIPTION
The combination meter assembly illuminates, blinks or turns off the front seat belt warning light on the combination meter assembly in accordance with the state of the front seat inner belt assembly LH.
HINT:
The front seat belt warning light on the combination meter assembly is used for both the driver side seat and front passenger side seat.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
-
The seat belt warning system uses the CAN communication system. First, confirm that there is no malfunction in the CAN communication system. Refer to the How to Proceed with Troubleshooting procedure.
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Before replacing the main body ECU (multiplex network body ECU), refer to the Smart Access System with Push-button Start (for Entry Function).
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- When replacing the combination meter assembly, make sure to replace it with a new one.
-
After replacing the airbag ECU assembly, refer to initialization.
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PROCEDURE
| 1. | CHECK FOR DTC (AIRBAG SYSTEM) |
(a) Clear the DTCs.
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(b) Check for DTCs.
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OK:
DTCs are not output.
| NG | .gif) | GO TO AIRBAG SYSTEM |
|
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| 2. | READ VALUE USING TECHSTREAM (LEFT SIDE BUCKLE SW) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / SRS Airbag / Data List.
(e) Read the Data List according to the display on the Techstream.
Body Electrical > SRS Airbag > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Left side Buckle SW | Driver side buckle switch | Unset, Set or NG | Unset: Seat belt not fastened Set: Seat belt fastened NG: Data is not determined | - |
| Tester Display |
|---|
| Left side Buckle SW |
| Result | Proceed to |
|---|---|
| Unset or Set is displayed on the Techstream screen according to the driver side seat belt condition | A |
| Unset or Set is not displayed normally on the Techstream screen according to the driver side seat belt condition | B |
| NG is displayed on the Techstream screen | C |
| B | | REPLACE FRONT SEAT INNER BELT ASSEMBLY LH |
| C | | REPLACE AIRBAG ECU ASSEMBLY |
|
| 3. | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
(a) Replace the main body ECU (multiplex network body ECU) with a new one.
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|
| 4. | CHECK SEAT BELT WARNING LIGHT |
(a) Check the operation of the seat belt warning light.
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OK:
The seat belt warning light operates normally.
| OK | | END (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] WAS DEFECTIVE) |
| NG | | REPLACE COMBINATION METER ASSEMBLY |
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