Supplemental Restraint System. Dtc B1630/23 Driver Side Rear Airbag Sensor Circuit Malfunction

Restraints. Lexus Is250, Is220D. Gse20 Ale20

Supplemental Restraint System. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK DTC

CHECK CONNECTION OF CONNECTORS

CHECK FLOOR WIRE NO. 2 (OPEN)

CHECK FLOOR WIRE NO. 2 (SHORT)

CHECK FLOOR WIRE NO. 2 (SHORT TO B+)

CHECK FLOOR WIRE NO. 2 (SHORT TO GROUND)

CHECK DRIVER SIDE REAR AIRBAG SENSOR

CHECK FLOOR WIRE NO. 2 (SHORT)

CHECK FLOOR WIRE NO. 2 (SHORT TO GROUND)

CHECK FLOOR WIRE NO. 2 (SHORT TOB+)

CHECK DRIVER SIDE - SIDE AIRBAG SENSOR

DTC B1630/23 Driver Side Rear Airbag Sensor Circuit Malfunction

DESCRIPTION

The driver 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 B1630/23 is recorded when a malfunction is detected in the driver side rear airbag sensor circuit.

DTC No.	DTC Detection Condition	Trouble Area
B1630/23	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 driver side rear airbag sensor circuit for 2 seconds. Driver side - side airbag sensor malfunction Driver side rear airbag sensor malfunction Center airbag sensor assembly malfunction	Floor wire No. 2 Driver side - side airbag sensor Driver side rear airbag sensor Center airbag sensor assembly

WIRING DIAGRAM

Lexus Is250, Is220D. Gse20 Ale20.Supplemental Restraint System.Airbag System.
Dtc
B1630/23 Driver Side Rear Airbag Sensor Circuit Malfunction

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 (Click here).

Turn the engine switch off.

Turn the engine switch on (IG), and wait for at least 60 seconds.

Check for DTCs (Click here).
OK:
DTC B1630/23 is not output.
HINT:
Codes other than DTC B1630/23 may be output at this time, but they are not related to this check.

Go to step 2

USE SIMULATION METHOD TO CHECK

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 driver side rear airbag sensor.
OK:
The connectors are properly connected.

CONNECT CONNECTORS, THEN GO TO STEP 1

OK

3.CHECK FLOOR WIRE NO. 2 (OPEN)

Disconnect the connectors from the center airbag sensor assembly and the driver side rear airbag sensor.

Using a service wire, connect Q32-8 (BCD+) and Q32-15 (BCD-) of connector "C".
NOTICE:
Do not forcibly insert a service wire into the terminals of the connector when connecting.

Measure the resistance according to the value(s) in the table below.

Standard resistance:
LHD:
Tester connection
Condition
Specified condition
Q15-4 (BCL+) - Q15-3 (BCL-)
Always
Below 1 Ω
RHD:
Tester connection
Condition
Specified condition
P11-4 (BCR+) - P11-3 (BCR-)
Always
Below 1 Ω

REPAIR OR REPLACE FLOOR WIRE NO. 2

OK

4.CHECK FLOOR WIRE NO. 2 (SHORT)

Disconnect the service wire from connector "B".

Measure the resistance according to the value(s) in the table below.

Standard resistance:
LHD:
Tester connection
Condition
Specified condition
Q15-4 (BCL+) - Q15-3 (BCL-)
Always
1 MΩ or higher
RHD:
Tester connection
Condition
Specified condition
P11-4 (BCR+) - P11-3 (BCR-)
Always
1 MΩ or higher

REPAIR OR REPLACE FLOOR WIRE NO. 2

OK

5.CHECK FLOOR WIRE NO. 2 (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
Q15-4 (BCL+) - Body ground
Engine switch on (IG)
Below 1 V
Q15-3 (BCL-) - Body ground
Engine switch on (IG)
Below 1 V
RHD:
Tester connection
Condition
Specified condition
P11-4 (BCR+) - Body ground
Engine switch on (IG)
Below 1 V
P11-3 (BCR-) - Body ground
Engine switch on (IG)
Below 1 V

REPAIR OR REPLACE FLOOR WIRE NO. 2

OK

6.CHECK FLOOR WIRE NO. 2 (SHORT TO GROUND)

Turn the engine switch off.

Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

Measure the resistance according to the value(s) in the table below.

Standard resistance:
LHD:
Tester connection
Condition
Specified condition
Q15-4 (BCL+) - Body ground
Always
1 MΩ or higher
Q15-3 (BCL-) - Body ground
Always
1 MΩ or higher
RHD:
Tester connection
Condition
Specified condition
P11-4 (BCR+) - Body ground
Always
1 MΩ or higher
P11-3 (BCR-) - Body ground
Always
1 MΩ or higher

REPAIR OR REPLACE FLOOR WIRE NO. 2

OK

7.CHECK DRIVER SIDE REAR AIRBAG SENSOR

Connect the connectors to the center airbag sensor assembly.

Interchange the front passenger side rear airbag sensor with the driver 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 (Click here).

Turn the engine switch off.

Turn the engine switch on (IG), and wait for at least 60 seconds.

Check for DTCs (Click here)
Result:
Result
Proceed to
DTC B1630/23 is output.
A
DTC B1635/24 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.

Go to step 8

REPLACE DRIVER SIDE REAR AIRBAG SENSOR

USE SIMULATION METHOD TO CHECK

8.CHECK FLOOR WIRE NO. 2 (SHORT)

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 rear airbag sensor and driver side rear airbag sensor to their original positions and connect the connectors to them.

Disconnect the connectors from the driver side - side airbag sensor and driver side rear airbag sensor.

Measure the resistance according to the value(s) in the table below.

Standard resistance:
LHD:
Tester connection
Condition
Specified condition
Q15-1 (BBL+) - Q15-2 (BBL-)
Always
1 MΩ or higher
RHD:
Tester connection
Condition
Specified condition
P11-1 (BBR+) - P11-2 (BBR-)
Always
1 MΩ or higher

REPAIR OR REPLACE FLOOR WIRE NO. 2

OK

9.CHECK FLOOR WIRE NO. 2 (SHORT TO GROUND)

Measure the resistance according to the value(s) in the table below.

Standard resistance:
LHD:
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
RHD:
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

REPAIR OR REPLACE FLOOR WIRE NO. 2

OK

10.CHECK FLOOR WIRE NO. 2 (SHORT TOB+)

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
Q15-1 (BBL+) - Body ground
Engine switch on (IG)
Below 1 V
Q15-2 (BBL-) - Body ground
Engine switch on (IG)
Below 1 V
RHD:
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

REPAIR OR REPLACE FLOOR WIRE NO. 2

OK

11.CHECK DRIVER 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 driver 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 (Click here).

Turn the engine switch off.

Turn the engine switch on (IG), and wait for at least 60 seconds.

Check for DTCs (Click here).
Result:
Result
Proceed to
DTC B1630/23 is output.
A
DTC B1635/24 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.

REPLACE CENTER AIRBAG SENSOR ASSEMBLY

REPLACE DRIVER SIDE - SIDE AIRBAG SENSOR

USE SIMULATION METHOD TO CHECK

Tester connection	Condition	Specified condition
Q15-4 (BCL+) - Q15-3 (BCL-)	Always	Below 1 Ω

Result	Proceed to
DTC B1630/23 is output.	A
DTC B1635/24 is output.	B
DTC B1630/23 and B1635/24 are not output.	C

Tester connection	Condition	Specified condition
P11-4 (BCR+) - P11-3 (BCR-)	Always	1 MΩ or higher

Tester connection	Condition	Specified condition
P11-4 (BCR+) - Body ground	Engine switch on (IG)	Below 1 V
P11-3 (BCR-) - Body ground	Engine switch on (IG)	Below 1 V