Lexus NX: Trouble in Passenger Airbag ON/OFF Indicator
DESCRIPTION
The occupant classification system detects the front passenger seat condition. It then displays the front passenger airbag condition (activated/not activated) using the passenger airbag ON/OFF indicator.
HINT:
Approximately 6 seconds after the power switch is turned on (IG), the passenger airbag ON/OFF indicator will indicate ON/OFF depending on the conditions listed below.
| Front Passenger Seat Condition | Passenger Airbag ON/OFF Indicator | SRS Warning Light | |
|---|---|---|---|
| ON Indicator | OFF Indicator | ||
| Vacant | Off | On | Off |
| Adult is seated. | On | Off | Off |
| Child is seated. | Off | On | Off |
| Child restraint system is installed. | |||
| Occupant classification system failure | Off | On | On |
CAUTION / NOTICE / HINT
NOTICE:
-
After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal.
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-
When disconnecting and reconnecting the auxiliary battery
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HINT:
When disconnecting and reconnecting the battery, there is an automatic learning function that completes learning when the respective system is used.
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-
When disconnecting the cable, some systems need to be initialized after the cable is reconnected.
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PROCEDURE
| 1. | CHECK SRS WARNING LIGHT |
(a) Turn the power switch on (IG), and check the SRS warning light condition.
HINT:
If passenger airbag ON/OFF indicator trouble occurs, the SRS warning light does not illuminate. If the light comes on, a DTC is stored. Troubleshoot for the DTC.
OK:
After the primary check period, the SRS warning light goes off.
HINT:
The primary check is performed for approximately 6 seconds after the power switch is turned on (IG).
| NG | .gif) | GO TO AIRBAG SYSTEM |
|
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| 2. | PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK |
(a) Using the Techstream, perform zero point calibration and sensitivity check.
Click here
| Tester Display |
|---|
| Zero Point Calibration & Sensitivity Check |
OK:
"Zero Point Calibration & Sensitivity Check is complete." is displayed.
| OK | | END |
|
| 3. | RETIGHTEN FRONT SEAT ASSEMBLY RH BOLT |
(a) Loosen the 4 installation bolts of the front seat assembly RH.
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(b) Tighten the 4 installation bolts of the front seat assembly RH to the specified torque.
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|
| 4. | PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK |
(a) Using the Techstream, perform zero point calibration and sensitivity check.
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OK:
"Zero Point Calibration is complete." and "Sensitivity Check is complete." are displayed.
Body Electrical > Occupant Detection > Utility| Tester Display |
|---|
| Zero Point Calibration & Sensitivity Check |
| OK | | END |
|
| 5. | READ VALUE USING TECHSTREAM |
(a) Using the Techstream, read the Data List.
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(1) Read the display when the front passenger side buckle switch is operated.
Body Electrical > Occupant Detection > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Passenger Buckle SW | Front seat belt assembly RH buckle switch | Set, Unset or NG | Set: The front seat belt assembly RH is fastened Unset: The front seat belt assembly RH is not fastened NG: Data is not determined | - |
| Tester Display |
|---|
| Passenger Buckle SW |
OK:
The Techstream display changes correctly in accordance with the operation of the buckle switch.
| NG | | GO TO STEP 9 |
|
| 6. | CHECK CONNECTORS |
(a) Turn the power switch off.
(b) Disconnect the cable from the negative (-) auxiliary battery terminal.
(c) Disconnect the connectors from the occupant detection ECU, front and rear occupant classification sensor LH.
(d) Check that the terminals of the connectors are not damaged.
OK:
The terminals are not deformed or damaged.
| NG | | REPLACE FRONT SEAT WIRE RH |
|
| 7. | REPLACE OCCUPANT DETECTION ECU |
(a) Connect the connectors to the front and rear occupant classification sensor LH.
(b) Replace the occupant detection ECU.
Click here
(c) Connect the cable to the negative (-) auxiliary battery terminal.
|
| 8. | PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK |
(a) Using the Techstream, perform zero point calibration and sensitivity check.
Click here
| Tester Display |
|---|
| Zero Point Calibration & Sensitivity Check |
| NEXT | | END |
| 9. | CHECK CONNECTORS |
(a) Turn the power switch off.
(b) Disconnect the cable from the negative (-) auxiliary battery terminal.
(c) Disconnect the connectors from the occupant detection ECU and front seat inner belt assembly RH.
(d) Check that the terminals of the connectors are not damaged.
OK:
The terminals are not deformed or damaged.
| NG | | REPLACE FRONT SEAT WIRE RH |
|
| 10. | REPLACE FRONT SEAT INNER BELT ASSEMBLY RH |
(a) Connect the connector to the occupant detection ECU.
(b) Replace the front seat inner belt assembly RH.
Click here
(c) Connect the cable to the negative (-) auxiliary battery terminal.
|
| 11. | PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK |
(a) Using the Techstream, perform zero point calibration and sensitivity check.
Click here
| Tester Display |
|---|
| Zero Point Calibration & Sensitivity Check |
| NEXT | | END |
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