Supplemental Restraint Systems. Dtc B1625/22 Side Airbag Sensor Lh Circuit Malfunction

The side airbag sensor LH circuit consists of the center airbag sensor assembly, side airbag sensor LH, door side airbag sensor LH* and rear airbag sensor LH.
The side airbag sensor LH, door side airbag sensor LH* and rear airbag sensor LH detect impacts to the vehicle and send signals to the center airbag sensor assembly to determine if the airbags should be deployed.
DTC B1625/22 is recorded when a malfunction is detected in the side airbag sensor LH circuit.

DTC No.	DTC Detection Condition	Trouble Area
B1625/22	The center airbag sensor assembly receives a short circuit signal, an open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the side airbag sensor LH circuit for 2 seconds. Side airbag sensor LH malfunction Rear airbag sensor LH malfunction Center airbag sensor assembly malfunction	Floor wire Side airbag sensor LH Rear airbag sensor LH Center airbag sensor assembly

*: w/ Daytime Running Light

WIRING DIAGRAM

Corolla. Zre142 Aze141.Supplemental Restraint Systems.Airbag System.
Dtc
B1625/22 Side Airbag Sensor Lh Circuit Malfunction

INSPECTION PROCEDURE

1.CHECK CONNECTORS

Turn the ignition switch off.

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

Check that the connectors are properly connected to the center airbag sensor assembly, side airbag sensor LH and rear airbag sensor LH.
OK:
The connectors are properly connected.
HINT:
If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.

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

Check that the terminals of the connectors are not damaged.
OK:
The terminals are not deformed or damaged.

REPLACE FLOOR WIRE

OK

2.CHECK FLOOR WIRE (OPEN)

Using SST, connect terminals 8 (BBL+) and 15 (BBL-) of connector B.

NOTICE:
Do not forcibly insert SST into the terminals of the connector when connecting.

SST: 09843-18040

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
L12-4 (BBL+) - L12-3 (BBL-)
Always
Below 1 Ω

Disconnect SST from connector B.

REPLACE FLOOR WIRE

OK

3.CHECK FLOOR WIRE (SHORT)

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
L12-4 (BBL+) - L12-3 (BBL-)
Always
1 MΩ or higher

REPLACE FLOOR WIRE

OK

4.CHECK FLOOR WIRE (SHORT TO B+)

Connect the cable to the negative (-) battery terminal.

Turn the ignition switch to ON.

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Switch Condition
Specified Condition
L12-4 (BBL+) - Body ground
Ignition switch ON
Below 1 V
L12-3 (BBL-) - Body ground
Ignition switch ON
Below 1 V

Turn the ignition switch off.

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

REPLACE FLOOR WIRE

OK

5.CHECK FLOOR WIRE (SHORT TO GROUND)

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
L12-4 (BBL+) - Body ground
Always
1 MΩ or higher
L12-3 (BBL-) - Body ground
Always
1 MΩ or higher

REPLACE FLOOR WIRE

OK

6.CHECK FLOOR WIRE (OPEN)

w/ Daytime Running Light:
1. Using SST, connect terminals 4 (BCL+) and 3 (BCL-) of connector C.
  
  NOTICE:
  Do not forcibly insert SST into the terminals of the connector when connecting.
2. Measure the resistance according to the value(s) in the table below.
  Standard Resistance:
  Tester Connection
  Condition
  Specified Condition
  L12-1 (BCL+) - L12-2 (BCL-)
  Always
  Below 1 Ω

SST: 09843-18040

w/o Daytime Running Light:
1. Using SST, connect terminals 2 (BCL+) and 1 (BCL-) of connector C.
  
  NOTICE:
  Do not forcibly insert SST into the terminals of the connector when connecting.
2. Measure the resistance according to the value(s) in the table below.
  Standard Resistance:
  Tester Connection
  Condition
  Specified Condition
  L12-1 (BCL+) - L12-2 (BCL-)
  Always
  Below 1 Ω

Disconnect SST from connector C.

REPLACE FLOOR WIRE

OK

7.CHECK FLOOR WIRE (SHORT)

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
L12-1 (BCL+) - L12-2 (BCL-)
Always
1 MΩ or higher

REPLACE FLOOR WIRE

OK

8.CHECK FLOOR WIRE (SHORT TO B+)

Connect the cable to the negative (-) battery terminal.

Turn the ignition switch to ON.

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Switch Condition
Specified Condition
L12-1 (BCL+) - Body ground
Ignition switch ON
Below 1 V
L12-2 (BCL-) - Body ground
Ignition switch ON
Below 1 V

Turn the ignition switch off.

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

REPLACE FLOOR WIRE

OK

9.CHECK FLOOR WIRE (SHORT TO GROUND)

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
L12-1 (BCL+) - Body ground
Always
1 MΩ or higher
L12-2 (BCL-) - Body ground
Always
1 MΩ or higher

REPLACE FLOOR WIRE

OK

10.CHECK SIDE AIRBAG SENSOR LH

Connect the connectors to the center airbag sensor assembly and the rear airbag sensor LH.

Interchange the side airbag sensor LH with RH and connect the connectors.

Connect the cable to the negative (-) battery terminal.

Turn the ignition switch to ON, and wait for at least 60 seconds.

Clear the DTCs stored in the memory (COROLLA_ZRE142 RM000000XFE0H1X.html).

Turn the ignition switch off.

Turn the ignition switch to ON, and wait for at least 60 seconds.

Check for DTCs (COROLLA_ZRE142 RM000000XFE0H1X.html).
Result:
Result
Proceed to
DTC B1625/22 is output.
A
DTC B1620/21 is output.
B
DTCs B1620/21 and B1625/22 are not output.
C
HINT:
Codes other than DTCs B1620/21 and B1625/22 may be output at this time, but they are not related to this check.

Turn the ignition switch off.

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

Return the side airbag sensors LH and RH to their original positions and connect the connectors.

REPLACE SIDE AIRBAG SENSOR LH (COROLLA_ZRE142 RM000000UWN09NX.html)

USE SIMULATION METHOD TO CHECK (COROLLA_ZRE142 RM000000XFD0GSX.html)

A

11.CHECK REAR AIRBAG SENSOR LH

Disconnect the connector from the rear airbag sensor LH.

Connect the cable to the negative (-) battery terminal.

Turn the ignition switch to ON, and wait for at least 60 seconds.

Clear the DTCs stored in the memory (COROLLA_ZRE142 RM000000XFE0H1X.html).

Turn the ignition switch off.

Turn the ignition switch to ON, and wait for at least 60 seconds.

Check for DTCs (COROLLA_ZRE142 RM000000XFE0H1X.html).
OK:
DTC B1625/22 is not output.
HINT:
Codes other than DTC B1625/22 may be output at this time, but they are not related to this check.

REPLACE CENTER AIRBAG SENSOR ASSEMBLY (COROLLA_ZRE142 RM000000UWV074X.html)

REPLACE REAR AIRBAG SENSOR LH (COROLLA_ZRE142 RM000000UWR08QX.html)

Tester Connection	Condition	Specified Condition
L12-4 (BBL+) - L12-3 (BBL-)	Always	Below 1 Ω

Tester Connection	Switch Condition	Specified Condition
L12-4 (BBL+) - Body ground	Ignition switch ON	Below 1 V
L12-3 (BBL-) - Body ground	Ignition switch ON	Below 1 V

Result	Proceed to
DTC B1625/22 is output.	A
DTC B1620/21 is output.	B
DTCs B1620/21 and B1625/22 are not output.	C