Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Trouble in Passenger Airbag ON/OFF Indicator
DESCRIPTION
The occupant classification system detects the front passenger seat condition. It then displays the instrument panel passenger airbag assembly and front seat cushion airbag assembly RH condition (activated/not activated) using the passenger airbag ON/OFF indicator.
HINT:
Approximately 6 seconds after the engine switch is turned on (IG), the passenger airbag ON/OFF indicator will indicate ON/OFF depending on the following conditions.
| Front Passenger Seat Condition | Passenger Airbag ON/OFF Indicator | SRS Warning Light | |
|---|---|---|---|
| ON Indicator | OFF Indicator | ||
| Vacant | OFF | ON | OFF |
| Adult*1 is seated | ON | OFF | OFF |
| Child*2 is seated | ON or OFF*2 | OFF or ON*2 | OFF |
| Child restraint system is installed | OFF | ON | OFF |
| Occupant classification system failure | OFF | ON | ON |
- *1: The system judges a person of average adult weight or more as an adult. If a smaller adult sits in the front passenger seat, the system may not recognize them as an adult depending on their physique and posture.
- *2: The system may not recognize a child or a child in a child restrain system as a child depending on factors such as the positioning of the child restraint system or the child's physique or posture.
WIRING DIAGRAM
Click here .gif)
CAUTION / NOTICE / HINT
NOTICE:
-
After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.
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- Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
| 1. | CHECK SRS WARNING LIGHT |
(a) Turn the engine switch on (IG), and check the SRS warning light condition.
OK:
After the primary check period, the SRS warning light goes off.
HINT:
The primary check is performed for approximately 6 seconds after the engine switch is turned on (IG).
| NG | .gif) | GO TO AIRBAG SYSTEM |
|
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| 2. | PERFORM ZERO POINT CALIBRATION |
(a) Using the Techstream, perform Zero Point Calibration.
Click here
| Tester Display |
|---|
| Zero Point Calibration |
OK:
"Zero Point Calibration 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.
(b) Tighten the 4 installation bolts of the front seat assembly RH to the specified torque.
Click here
|
| 4. | PERFORM ZERO POINT CALIBRATION |
(a) Using the Techstream, perform Zero Point Calibration.
Click here
| Tester Display |
|---|
| Zero Point Calibration |
OK:
"Zero Point Calibration is complete." is displayed.
| OK | | END |
|
| 5. | READ VALUE USING TECHSTREAM |
(a) Turn the engine switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the engine switch on (IG).
(d) Turn the Techstream on.
(e) Enter the following menus: Body Electrical / Occupant Detection / Data List.
(f) Read the Data List according to the display on the Techstream.
Body Electrical > Occupant Detection > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Passenger Buckle SW | Passenger side buckle switch | NG, Set or Unset | Set: Front passenger seat belt is fastened Unset: Front passenger seat belt is not fastened | "NG" will be displayed immediately after the engine switch is turned on. |
| Tester Display |
|---|
| Passenger Buckle SW |
OK:
The Techstream display changes correctly in accordance with the operation of the passenger side buckle switch.
| NG | | GO TO STEP 9 |
|
| 6. | CHECK CONNECTORS |
(a) Turn the engine switch off.
(b) Disconnect the cable from the negative (-) battery terminal.
(c) Disconnect the connectors from the occupant detection ECU, front occupant classification sensor LH and rear occupant classification sensor LH.
(d) Check that the terminals of the connectors are not deformed or 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 occupant classification sensor LH and rear occupant classification sensor LH.
(b) Replace the occupant detection ECU.
Click here
(c) Connect the cable to the negative (-) battery terminal.
|
| 8. | PERFORM ZERO POINT CALIBRATION |
(a) Using the Techstream, perform Zero Point Calibration.
Click here
| Tester Display |
|---|
| Zero Point Calibration |
| NEXT | | END |
| 9. | REPLACE FRONT SEAT INNER BELT ASSEMBLY RH |
(a) Turn the engine switch off.
(b) Disconnect the cable from the negative (-) battery terminal.
(c) Replace the front seat inner belt assembly RH.
Click here
(d) Connect the cable to the negative (-) battery terminal.
|
| 10. | PERFORM ZERO POINT CALIBRATION |
(a) Using the Techstream, perform Zero Point Calibration.
Click here
| Tester Display |
|---|
| Zero Point Calibration |
| NEXT | | END |
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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