Lexus IS250 IS220d GSE20 ALE20 - SUPPLEMENTAL RESTRAINT SYSTEM
CHECK CONNECTION OF CONNECTORS
CHECK DRIVER SIDE - SIDE AIRBAG SENSOR
CHECK DRIVER SIDE REAR AIRBAG SENSOR
DTC B1620/21 Driver Side - Side Airbag Sensor Circuit Malfunction
DESCRIPTION
The driver side - side airbag sensor circuit consists of the safing sensor, the diagnostic circuit, the lateral deceleration sensor, etc.
If the center airbag sensor assembly receives signals from the lateral deceleration sensor, it determines whether or not the SRS should be activated.
DTC B1620/21 is recorded when a malfunction is detected in the driver side - side airbag sensor circuit.
| DTC No. | DTC Detection Condition | Trouble Area |
| B1620/21 | The center airbag sensor assembly receives an open circuit signal in the driver side - side airbag sensor circuit for 2 seconds. Driver side rear airbag sensor malfunction Driver side - side airbag sensor malfunction Center airbag sensor assembly malfunction | Floor wire No. 2 Driver side rear airbag sensor Driver side - side airbag sensor Center airbag sensor assembly |
- HINT:
- Troubleshoot DTC B1620/21 first when DTC B1620/21 and B1630/23 are output simultaneously.
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.CHECK DTC |
Turn the engine switch on (IG), and wait for at least 60 seconds.
Clear the DTCs stored in the memory .
Turn the engine switch off.
Turn the engine switch on (IG), and wait for at least 60 seconds.
Check for DTCs .
- OK:
- DTC B1620/21 is not output.
- HINT:
- Codes other than DTC B1620/21 may be output at this time, but they are not related to this check.
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| OK | ||
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| 2.CHECK CONNECTION OF CONNECTORS |
Turn the engine switch off.
Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
Check that the connectors are properly connected to the driver side - side airbag sensor and the driver side rear airbag sensor.
- OK:
- The connectors are properly connected.
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| C | ||
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| 5.CHECK DRIVER SIDE REAR AIRBAG SENSOR |
Turn the engine switch off.
Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
Return the front passenger side - side airbag sensor and driver side - side airbag sensor to their original positions and connect the connectors to them.
Interchange the driver side rear airbag sensor with the front passenger side rear airbag sensor and connect the connectors to them.
Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
Turn the engine switch on (IG), and wait for at least 60 seconds.
Clear the DTCs stored in the memory .
Turn the engine switch off.
Turn the engine switch on (IG), and wait for at least 60 seconds.
Check for DTCs .
- Result:
Result Proceed to DTC B1620/21 is output. A DTC B1625/22 is output. B DTC B1620/21 and B1625/22 are not output. C
- HINT:
- Codes other than DTC B1620/21 and B1625/22 may be output at this time, but they are not related to this check.
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| C | ||
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