Lexus IS250 IS220d GSE20 ALE20 - SUPPLEMENTAL RESTRAINT SYSTEM
CHECK CONNECTION OF CONNECTORS
CHECK FLOOR WIRE (SHORT TO B+)
CHECK FLOOR WIRE (SHORT TO GROUND)
CHECK FRONT PASSENGER SIDE REAR AIRBAG SENSOR
CHECK FLOOR WIRE (SHORT TO GROUND)
CHECK FLOOR WIRE (SHORT TO B+)
CHECK FRONT PASSENGER SIDE - SIDE AIRBAG SENSOR
DTC B1635/24 Front Passenger Side Rear Airbag Sensor Circuit Malfunction
DESCRIPTION
The front passenger side rear 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 B1635/24 is recorded when a malfunction is detected in the front passenger side rear airbag sensor circuit.
| DTC No. | DTC Detection Condition | Trouble Area |
| B1635/24 | The center airbag sensor assembly receives a line short circuit signal, an open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the front passenger side rear airbag sensor circuit for 2 seconds. Front passenger side - side airbag sensor malfunction Front passenger side rear airbag sensor malfunction Center airbag sensor assembly malfunction | Floor wire Front passenger side - side airbag sensor Front passenger side rear airbag sensor Center airbag sensor assembly |
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 B1635/24 is not output.
- HINT:
- Codes other than DTC B1635/24 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 center airbag sensor assembly and the front passenger side rear airbag sensor.
- OK:
- The connectors are properly connected.
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| C | ||
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| 8.CHECK FLOOR WIRE (SHORT) |
Turn the engine switch off.
Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
Return the driver side rear airbag sensor and front passenger side rear airbag sensor to their original positions and connect the connectors to them.
Disconnect the connectors from the front passenger side - side airbag sensor and front passenger side rear airbag sensor.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
- LHD:
Tester connection Condition Specified condition P11-1 (BBR+) - P11-2 (BBR-) Always 1 MΩ or higher - RHD:
Tester connection Condition Specified condition Q15-1 (BBL+) - Q15-2 (BBL-) Always 1 MΩ or higher
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| OK | |
| 9.CHECK FLOOR WIRE (SHORT TO GROUND) |
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
- LHD:
Tester connection Condition Specified condition P11-1 (BBR+) - Body ground Always 1 MΩ or higher P11-2 (BBR-) - Body ground Always 1 MΩ or higher - RHD:
Tester connection Condition Specified condition Q15-1 (BBL+) - Body ground Always 1 MΩ or higher Q15-2 (BBL-) - Body ground Always 1 MΩ or higher
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| OK | |
| 10.CHECK FLOOR WIRE (SHORT TO B+) |
Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
Turn the engine switch on (IG).
Measure the voltage according to the value(s) in the table below.
- Standard voltage:
- LHD:
Tester connection Condition Specified condition P11-1 (BBR+) - Body ground Engine switch on (IG) Below 1 V P11-2 (BBR-) - Body ground Engine switch on (IG) Below 1 V - RHD:
Tester connection Condition Specified condition Q15-1 (BBL+) - Body ground Engine switch on (IG) Below 1 V Q15-2 (BBL-) - Body ground Engine switch on (IG) Below 1 V
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| OK | |
| 11.CHECK FRONT PASSENGER SIDE - SIDE AIRBAG SENSOR |
Turn the engine switch off.
Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
Connect the connector to the front passenger side rear airbag sensor.
Interchange the front passenger side - side airbag sensor with the driver side - side 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 B1635/24 is output. A DTC B1630/23 is output. B DTC B1630/23 and B1635/24 are not output. C
- HINT:
- Codes other than DTC B1630/23 and B1635/24 may be output at this time, but they are not related to this check.
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| C | ||
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