Supplemental Restraint Systems. Dtc B1638/82 Rear Airbag Sensor Assembly Lh Initialization Incomplete

The side collision sensor LH circuit (to determine deployment of the front seat side airbag assembly LH and curtain shield airbag assembly LH) is composed of the airbag sensor assembly, side airbag sensor assembly LH, door side airbag sensor LH and No. 2 side airbag sensor assembly LH.
The side airbag sensor assembly LH, door side airbag sensor LH and No. 2 side airbag sensor assembly LH detect impacts to the vehicle and send signals to the airbag sensor assembly to determine if the airbag should be deployed.
This DTC is stored when a malfunction is detected for the side collision sensor LH circuit (to determine deployment of the front seat side airbag assembly LH and curtain shield airbag assembly LH).

DTC No.	DTC Detection Condition	Trouble Area
B1638/82	The 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 side collision sensor LH circuit (to determine deployment of the front seat side airbag assembly LH and curtain shield airbag assembly LH). Side airbag sensor assembly LH malfunction Door side airbag sensor LH malfunction No. 2 side airbag sensor assembly LH malfunction Airbag sensor assembly malfunction	Floor wire Front door wire LH Side airbag sensor assembly LH Door side airbag sensor LH No. 2 side airbag sensor assembly LH Airbag sensor assembly

WIRING DIAGRAM

Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan).
Dtc
B1638/82 Rear Airbag Sensor Assembly Lh Initialization Incomplete

INSPECTION PROCEDURE

1.CHECK HISTORY DTC

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

Check for history DTCs (YARIS_NCP93 RM000000XFE0EEX.html).
OK:
History DTC B1632/81 or B1637/82 is not output.
HINT:
Codes other than history DTCs B1632/81 and B1637/82 may be output at this time, but they are not related to this check.

INSPECTION PROCEDURE RELEVANT TO OUTPUT DTC (YARIS_NCP93 RM000000XF70AIX.html)

OK

2.CHECK CONNECTORS

Turn the ignition switch off.

Disconnect the cable from the negative (-) battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

Check that the connectors are properly connected to the airbag sensor assembly, door side airbag sensor LH and No. 2 side airbag sensor assembly 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 airbag sensor assembly, door side airbag sensor LH and No. 2 side airbag sensor assembly LH.

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

REPLACE WIRE HARNESS

OK

3.CHECK FLOOR WIRE (OPEN)

Using the service wire, connect terminals 3 (BCL-) and 4 (BCL+) of connector C.

Text in Illustration
*1	No. 2 Side Airbag Sensor Assembly LH	*2	Side Airbag Sensor Assembly LH
*3	Floor Wire	*4	Connector B
*5	Connector C	*6	Service Wire
*a	Front view of wire harness connector (to Side Airbag Sensor Assembly LH)	*b	Front view of wire harness connector (to No. 2 Side Airbag Sensor Assembly LH)

NOTICE:

Do not forcibly insert the service wire into the terminals of the connector when connecting.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
J73-2 (BCL-) - J73-1 (BCL+)
Always
Below 1 Ω

REPLACE FLOOR WIRE

OK

4.CHECK FLOOR WIRE (SHORT)

Disconnect the service wire from connector C.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
J73-1 (BCL+) - J73-2 (BCL-)
Always
1 MΩ or higher
Text in Illustration
*1
No. 2 Side Airbag Sensor Assembly LH
*2
Side Airbag Sensor Assembly LH
*3
Floor Wire
*4
Connector B
*a
Front view of wire harness connector
(to Side Airbag Sensor Assembly LH)

Text in Illustration
*1	No. 2 Side Airbag Sensor Assembly LH
*2	Side Airbag Sensor Assembly LH
*3	Floor Wire
*4	Connector B
*a	Front view of wire harness connector (to Side Airbag Sensor Assembly LH)

REPLACE FLOOR WIRE

OK

5.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
J73-1 (BCL+) - Body ground
Ignition switch ON
Below 1 V
J73-2 (BCL-) - Body ground
Ignition switch ON
Below 1 V
Text in Illustration
*1
No. 2 Side Airbag Sensor Assembly LH
*2
Side Airbag Sensor Assembly LH
*3
Floor Wire
*4
Connector B
*a
Front view of wire harness connector
(to Side Airbag Sensor Assembly LH)

Text in Illustration
*1	No. 2 Side Airbag Sensor Assembly LH
*2	Side Airbag Sensor Assembly LH
*3	Floor Wire
*4	Connector B
*a	Front view of wire harness connector (to Side Airbag Sensor Assembly LH)

REPLACE FLOOR WIRE

OK

6.CHECK FLOOR WIRE (SHORT TO GROUND)

Turn the ignition switch off.

Disconnect the cable from the negative (-) battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
J73-1 (BCL+) - Body ground
Always
1 MΩ or higher
J73-2 (BCL-) - Body ground
Always
1 MΩ or higher
Text in Illustration
*1
No. 2 Side Airbag Sensor Assembly LH
*2
Side Airbag Sensor Assembly LH
*3
Floor Wire
*4
Connector B
*a
Front view of wire harness connector
(to Side Airbag Sensor Assembly LH)

Text in Illustration
*1	No. 2 Side Airbag Sensor Assembly LH
*2	Side Airbag Sensor Assembly LH
*3	Floor Wire
*4	Connector B
*a	Front view of wire harness connector (to Side Airbag Sensor Assembly LH)

REPLACE FLOOR WIRE

OK

7.CHECK FLOOR WIRE AND FRONT DOOR WIRE LH (OPEN)

Using the service wire, connect terminals 2 (BDL+) and 1 (BDL-) of connector E.

Text in Illustration
*1	Door Side Airbag Sensor LH	*2	No. 2 Side Airbag Sensor Assembly LH
*3	Front Door Wire LH	*4	Floor Wire
*5	Connector B	*6	Connector E
*7	Service Wire	-	-
*a	Front view of wire harness connector (to No. 2 Side Airbag Sensor Assembly LH)	*b	Front view of wire harness connector (to Door Side Airbag Sensor LH)

NOTICE:

Do not forcibly insert the service wire into the terminals of the connector when connecting.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
J75-1 (BDL+) - J75-2 (BDL-)
Always
Below 1 Ω

Go to step 14

OK

8.CHECK FLOOR WIRE AND FRONT DOOR WIRE LH (SHORT)

Disconnect the service wire from connector E.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
J75-1 (BDL+) - J75-2 (BDL-)	Always	1 MΩ or higher

Text in Illustration
*1	Door Side Airbag Sensor LH
*2	No. 2 Side Airbag Sensor Assembly LH
*3	Front Door Wire LH
*4	Floor Wire
*5	Connector B
*a	Front view of wire harness connector (to No. 2 Side Airbag Sensor Assembly LH)

Go to step 15

OK

9.CHECK FLOOR WIRE AND FRONT DOOR WIRE LH (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
J75-1 (BDL+) - Body ground	Ignition switch ON	Below 1 V
J75-2 (BDL-) - Body ground	Ignition switch ON	Below 1 V

Text in Illustration
*1	Door Side Airbag Sensor LH
*2	No. 2 Side Airbag Sensor Assembly LH
*3	Front Door Wire LH
*4	Floor Wire
*5	Connector B
*a	Front view of wire harness connector (to No. 2 Side Airbag Sensor Assembly LH)

Go to step 16

OK

10.CHECK FLOOR WIRE AND FRONT DOOR WIRE LH (SHORT TO GROUND)

Turn the ignition switch off.

Disconnect the cable from the negative (-) battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
J75-1 (BDL+) - Body ground	Always	1 MΩ or higher
J75-2 (BDL-) - Body ground	Always	1 MΩ or higher

Text in Illustration
*1	Door Side Airbag Sensor LH
*2	No. 2 Side Airbag Sensor Assembly LH
*3	Front Door Wire LH
*4	Floor Wire
*5	Connector B
*a	Front view of wire harness connector (to No. 2 Side Airbag Sensor Assembly LH)

Go to step 17

OK

11.CHECK SIDE AIRBAG SENSOR ASSEMBLY LH

Connect the connectors to the door side airbag sensor LH and airbag sensor assembly.

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

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 (YARIS_NCP93 RM000000XFE0EEX.html).

Turn the ignition switch off.

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

Check for DTCs (YARIS_NCP93 RM000000XFE0EEX.html).
Result
Result
Proceed to
DTC B1638/82 is output.
A
DTC B1633/81 is output.
(for 5 Door)
B
DTC B1633/81 is output.
(for 3 Door)
C
DTC B1633/81 or B1638/82 is not output.
D
Text in Illustration
*1
Side Airbag Sensor Assembly RH
*2
Airbag Sensor Assembly
HINT:
Codes other than DTCs B1633/81 and B1638/82 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.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

Return the side airbag sensor assembly LH and the side airbag sensor assembly RH to their original positions and connect the connectors to them.

REPLACE SIDE AIRBAG SENSOR ASSEMBLY LH (YARIS_NCP93 RM000003QZ000BX.html)

REPLACE SIDE AIRBAG SENSOR ASSEMBLY LH (YARIS_NCP93 RM0000029C6018X.html)

USE SIMULATION METHOD TO CHECK (YARIS_NCP93 RM00000135202EX.html)

A

12.CHECK NO. 2 SIDE AIRBAG SENSOR ASSEMBLY LH

Connect the connectors to the door side airbag sensor LH and airbag sensor assembly.

Interchange the No. 2 side airbag sensor assembly LH with the No. 2 side airbag sensor assembly RH and connect the connectors to them.

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 (YARIS_NCP93 RM000000XFE0EEX.html).

Turn the ignition switch off.

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

Check for DTCs (YARIS_NCP93 RM000000XFE0EEX.html).
Result
Result
Proceed to
DTC B1638/82 is output.
A
DTC B1633/81 is output.
(for 5 Door)
B
DTC B1633/81 is output.
(for 3 Door)
C
DTC B1633/81 or B1638/82 is not output.
D
Text in Illustration
*1
No. 2 Side Airbag Sensor Assembly RH
*2
Side Airbag Sensor Assembly LH
HINT:
Codes other than DTCs B1633/81 and B1638/82 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.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

Return the No. 2 side airbag sensor assembly LH and the No. 2 side airbag sensor assembly RH to their original positions and connect the connectors to them.

REPLACE NO. 2 SIDE AIRBAG SENSOR ASSEMBLY LH (YARIS_NCP93 RM000001IBD02AX.html)

REPLACE NO. 2 SIDE AIRBAG SENSOR ASSEMBLY LH (YARIS_NCP93 RM000001IBD02BX.html)

USE SIMULATION METHOD TO CHECK (YARIS_NCP93 RM00000135202EX.html)

A

13.CHECK DOOR SIDE AIRBAG SENSOR LH

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

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 (YARIS_NCP93 RM000000XFE0EEX.html).

Turn the ignition switch off.

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

Check for DTCs (YARIS_NCP93 RM000000XFE0EEX.html).
Result
Result
Proceed to
DTC B1633/81 or B1638/82 is not output.
A
DTC B1638/82 is output.
B
DTC B1633/81 is output.
C
Text in Illustration
*1
Door Side Airbag Sensor RH
*2
No. 2 Side Airbag Sensor Assembly LH
HINT:
Codes other than DTCs B1633/81 and B1638/82 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.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

Return the door side airbag sensor LH and the door side airbag sensor RH to their original positions and connect the connectors to them.

REPLACE AIRBAG SENSOR ASSEMBLY (YARIS_NCP93 RM000000V6U02AX.html)

REPLACE DOOR SIDE AIRBAG SENSOR LH (YARIS_NCP93 RM000001IB7021X.html)

USE SIMULATION METHOD TO CHECK (YARIS_NCP93 RM00000135202EX.html)

14.CHECK FRONT DOOR WIRE LH (OPEN)

Disconnect the floor wire connector from the front door wire LH.

Text in Illustration
*1	Door Side Airbag Sensor LH	*2	No. 2 Side Airbag Sensor Assembly LH
*3	Front Door Wire LH	*4	Floor Wire
*5	Connector D	*6	Connector E
*7	Service Wire	-	-
*a	Front view of wire harness connector (to Floor Wire)	*b	Front view of wire harness connector (to Door Side Airbag Sensor Assembly LH)

HINT:

The service wire has already been inserted into connector E.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
GJ1-1 (BDL+) - GJ1-2 (BDL-)
Always
Below 1 Ω

Disconnect the service wire from connector E.

REPLACE FRONT DOOR WIRE LH

REPLACE FLOOR WIRE

15.CHECK FRONT DOOR WIRE LH (SHORT)

Disconnect the floor wire connector from the front door wire LH.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
GJ1-1 (BDL+) - GJ1-2 (BDL-)
Always
1 MΩ or higher
Text in Illustration
*1
Door Side Airbag Sensor LH
*2
No. 2 Side Airbag Sensor Assembly LH
*3
Front Door Wire LH
*4
Floor Wire
*5
Connector D
*a
Front view of wire harness connector
(to Floor Wire)

REPLACE FRONT DOOR WIRE LH

REPLACE FLOOR WIRE

16.CHECK FRONT DOOR WIRE LH (SHORT TO B+)

Turn the ignition switch off.

Disconnect the cable from the negative (-) battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

Disconnect the front door wire connector from the floor wire.

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
GJ1-1 (BDL+) - Body ground
Ignition switch ON
Below 1 V
GJ1-2 (BDL-) - Body ground
Ignition switch ON
Below 1 V
Text in Illustration
*1
Door Side Airbag Sensor LH
*2
No. 2 Side Airbag Sensor Assembly LH
*3
Front Door Wire LH
*4
Floor Wire
*5
Connector D
*a
Front view of wire harness connector
(to Floor Wire)

REPLACE FRONT DOOR WIRE LH

REPLACE FLOOR WIRE

17.CHECK FRONT DOOR WIRE LH (SHORT TO GROUND)

Disconnect the front door wire connector from the floor wire.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
GJ1-1 (BDL+) - Body ground
Always
1 MΩ or higher
GJ1-2 (BDL-) - Body ground
Always
1 MΩ or higher
Text in Illustration
*1
Door Side Airbag Sensor LH
*2
No. 2 Side Airbag Sensor Assembly LH
*3
Front Door Wire LH
*4
Floor Wire
*5
Connector D
*a
Front view of wire harness connector
(to Floor Wire)

REPLACE FRONT DOOR WIRE LH

REPLACE FLOOR WIRE

Result	Proceed to
DTC B1638/82 is output.	A
DTC B1633/81 is output. (for 5 Door)	B
DTC B1633/81 is output. (for 3 Door)	C
DTC B1633/81 or B1638/82 is not output.	D

*1	No. 2 Side Airbag Sensor Assembly RH
*2	Side Airbag Sensor Assembly LH

*1	Door Side Airbag Sensor RH
*2	No. 2 Side Airbag Sensor Assembly LH