Toyota Tacoma (2015-2018) Service Manual: Rear Airbag Sensor LH Circuit Malfunction (B1635/24)

DESCRIPTION

The airbag sensor LH consists of parts such as the safing sensor, the diagnostic circuit and the lateral deceleration sensor.

When the airbag sensor assembly receives signals from the lateral deceleration sensor, it determines whether or not the SRS should be activated.

DTC B1635/24 is set when a malfunction is detected in the side airbag sensor assembly LH and rear airbag sensor LH circuit.

DTC No.	DTC Detections Conditions	Trouble Areas
B1635/24	The airbag sensor assembly receives an open circuit signal in the side airbag sensor assembly LH and rear airbag sensor LH circuit for 2 seconds Rear airbag sensor LH malfunction Side airbag sensor assembly LH malfunction Airbag sensor assembly malfunction	Rear airbag sensor LH Side airbag sensor assembly LH Airbag sensor assembly No. 2 floor wire

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work (See page ).

PROCEDURE

1.	CHECK CONNECTOR OF CONNECTORS

(a) Turn the ignition switch off.

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

(c) Check that the connectors are properly connected to the side airbag sensor assembly LH and the rear airbag sensor LH.

OK:

The connectors are properly connected.

NG

CONNECT CONNECTORS

OK

2.	CHECK CONNECTORS

(a) Check that the connectors (on the side airbag sensor assembly LH side and rear airbag sensor LH side) are not damaged (See page ).

OK:

The connectors are not deformed or damaged.

NG

REPLACE WIRE HARNESS

OK

3.	CHECK NO. 2 FLOOR WIRE (FOR OPEN)

(a) Disconnect the connectors from the side airbag sensor assembly LH and the rear airbag sensor LH.

(b) Using service wire, connect S13-2 (BCL+) and S13-1 (BCL-) of connector C.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
S11-1 (BCL+) - S11-2 (BCL-)	Always	Below 1 Ω

Text in Illustration

*1	Rear Airbag Sensor LH
*2	Side Airbag Sensor Assembly LH
*3	Service Wire

NG

REPLACE NO. 2 FLOOR WIRE

OK

4.	CHECK NO. 2 FLOOR WIRE (FOR SHORT)

(a) Disconnect the service wire from connector C.

(b) Disconnect the connectors from the side airbag sensor assembly LH and rear airbag sensor LH.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
S11-1 (BCL+) - S11-2 (BCL-)	Always	1 MΩ or Higher

Text in Illustration

*1	Rear Airbag Sensor LH
*2	Side Airbag Sensor Assembly LH

NG

REPLACE NO. 2 FLOOR WIRE

OK

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

(a) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

(b) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
S11-1 (BCL+) - Body ground	Ignition switch ON	Below 1 V
S11-2 (BCL-) - Body ground	Ignition switch ON	Below 1 V

Text in Illustration

*1	Rear Airbag Sensor LH
*2	Side Airbag Sensor Assembly LH

NG

REPLACE NO. 2 FLOOR WIRE

OK

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

(a) Turn the ignition switch off.

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
S11-1 (BCL+) - Body ground	Always	1 MΩ or Higher
S11-2 (BCL-) - Body ground	Always	1 MΩ or Higher

Text in Illustration

*1	Rear Airbag Sensor LH
*2	Side Airbag Sensor Assembly LH

NG

REPLACE NO. 2 FLOOR WIRE

OK

7.	CHECK REAR AIRBAG SENSOR LH

(a) Connect the connector to the side airbag sensor assembly LH.

(b) Interchange the rear airbag sensor LH with the rear airbag sensor RH and connect the connectors to them.

(c) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

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

(e) Clear any DTCs stored in the memory (See page ).

(f) Turn the ignition switch off.

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

(h) Check for DTCs (See page ).

Result

Result	Proceed to
DTC B1635/24 is output.	A
DTC B1630/23 is output.	B
Neither DTC B1630/23 nor B1635/24 is output.	C

B

REPLACE REAR AIRBAG SENSOR LH

C

USE SIMULATION METHOD TO CHECK

A

8.	CHECK SIDE AIRBAG SENSOR ASSEMBLY LH

(a) Turn the ignition switch off.

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

(c) Return the rear airbag sensor LH and RH to their original positions and connect the connectors to them.

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

(e) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

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

(g) Clear any DTCs stored in the memory (See page ).

(h) Turn the ignition switch off.

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

(j) Check for DTCs (See page ).

Result

Result	Proceed to
DTC B1635/24 is output.	A
DTC B1630/23 is output.	B
Neither DTC B1630/23 nor B1635/24 is output.	C

HINT:

DTCs other than B1630/23 and B1635/24 may be output at this time, but they are not related to this check.

B

REPLACE REAR AIRBAG SENSOR LH

C

USE SIMULATION METHOD TO CHECK

A

9.	REPLACE AIRBAG SENSOR ASSEMBLY

(a) Turn the ignition switch off.

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

(c) Replace the airbag sensor assembly (See page ).

HINT:

Perform the inspection using parts from a normal vehicle when possible.

(d) Connect the connectors to the airbag sensor assembly.

(e) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

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

(g) Clear any DTCs stored in the memory (See page ).

(h) Turn the ignition switch off.

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

(j) Check for DTCs (See page ).

OK:

DTC B1635/24 is not output.

HINT:

DTCs other than B1635/24 may be output at this time, but they are not related to this check.

Result

Result	Proceed to
NG	A
OK	B

B

END

A

10.	CHECK REAR AIRBAG SENSOR LH

(a) Turn the ignition switch off.

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

(c) Replace the rear airbag sensor LH for Double Cab (See page ) or for Access Cab (See page ).

(d) Connect the connectors to the airbag sensor assembly.

(e) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

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

(g) Clear any DTCs stored in the memory (See page ).

(h) Turn the ignition switch off.

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

(j) Check for DTCs (See page ).

OK:

DTC B1635/24 is not output.

HINT:

DTCs other than B1635/24 may be output at this time, but they are not related to this check.

OK

END

NG

REPLACE SIDE AIRBAG SENSOR ASSEMBLY LH