Toyota Tacoma (2015-2018) Service Manual: Short in Curtain Shield Squib LH Circuit (B1835/58-B1838/58)

DESCRIPTION

The driver side curtain shield squib circuit consists of the airbag sensor assembly and the curtain shield airbag assembly LH.

The circuit signals the SRS to deploy when airbag deployment conditions are met.

These DTCs are set when a malfunction is detected in the driver side curtain shield squib circuit.

DTC No.	DTC Detecting Conditions	Trouble Areas
B1835/58	The airbag sensor assembly receives a line short circuit signal in the driver side curtain shield squib circuit for 2 seconds Driver side curtain shield squib malfunction Airbag sensor assembly malfunction	No. 2 floor wire Curtain shield airbag assembly LH (Driver side curtain shield squib) Airbag sensor assembly
B1836/58	The airbag sensor assembly receives an open circuit signal in the driver side curtain shield squib circuit for 2 seconds Driver side curtain shield squib malfunction Airbag sensor assembly malfunction	No. 2 floor wire Curtain shield airbag assembly LH (Driver side curtain shield squib) Airbag sensor assembly
B1837/58	The airbag sensor assembly receives a short circuit to ground signal in the driver side curtain shield squib circuit for 0.5 seconds Driver side curtain shield squib malfunction Airbag sensor assembly malfunction	No. 2 floor wire Curtain shield airbag assembly LH (Driver side curtain shield squib) Airbag sensor assembly
B1838/58	The airbag sensor assembly receives a short circuit to B+ signal in the driver side curtain shield squib circuit for 0.5 seconds Driver side curtain shield squib malfunction Airbag sensor assembly malfunction	No. 2 floor wire Curtain shield airbag assembly LH (Driver side curtain shield squib) Airbag sensor assembly

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 DTC

(a) Proceed to next step according to DTC readings.

(1) If using the Techstream (read the 5-digit DTCs):

Using the Techstream, check for DTCs (See page ).

Result

Result	Proceed to
DTC B1835 is output.	A
DTC B1836 is output.	B
DTC B1837 is output.	C
DTC B1838 is output.	D

B

GO TO STEP 4

C

GO TO STEP 5

D

GO TO STEP 6

A

2.	CHECK CONNECTOR

(a) Check that the floor wire connector (on the curtain shield airbag assembly LH side) is not damaged.

OK:

The lock button is not disengaged, and the claw of the lock is not deformed or damaged.

NG

REPLACE NO. 2 FLOOR WIRE

OK

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

(a) Release the activation prevention mechanism built into connector B (See page ).

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
C16-1 (ICL-) - C16-2 (ICL+)	Always	1 MΩ or Higher

Text in Illustration

*1	No. 2 Floor Wire
*2	Driver Side Curtain Shield Squib
*3	Airbag Sensor Assembly

Result

Result	Proceed to
NG	A
OK	B

A

REPLACE NO. 2 FLOOR WIRE

B

GO TO STEP 7

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

(a) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition C16-1 (ICL-) - C16-2 (ICL+) Always Below 1 Ω Text in Illustration *1 No. 2 Floor Wire *2 Driver Side Curtain Shield Squib *3 Airbag Sensor Assembly

Result

Result	Proceed to
NG	A
OK	B

A

REPLACE NO. 2 FLOOR WIRE

B

GO TO STEP 8

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

(a) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition C16-1 (ICL-) - Body ground Always 1 MΩ or Higher C16-2 (ICL+) - Body ground Always 1 MΩ or Higher Text in Illustration *1 No. 2 Floor Wire *2 Driver Side Curtain Shield Squib *3 Airbag Sensor Assembly

Result

Result	Proceed to
NG	A
OK	B

A

REPLACE NO. 2 FLOOR WIRE

B

GO TO STEP 8

6.	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
C16-1 (ICL-) - Body ground	Ignition switch ON	Below 1 V
C16-2 (ICL+) - Body ground	Ignition switch ON	Below 1 V

Text in Illustration

*1	No. 2 Floor Wire
*2	Driver Side Curtain Shield Squib
*3	Airbag Sensor Assembly

Result

Result	Proceed to
NG	A
OK	B

A

REPLACE NO. 2 FLOOR WIRE

B

GO TO STEP 8

7.	CHECK AIRBAG SENSOR ASSEMBLY

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

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

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

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

(e) Turn the ignition switch off.

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

(g) Check for DTCs (See page ).

OK:

DTC B1835 is not output.

Text in Illustration

*1	Airbag Sensor Assembly
*2	Driver Side Curtain Shield Squib

HINT:

DTCs other than B1835 may be output at this time, but they are not related to this check.

Result

Result	Proceed to
NG	A
OK	B

A

REPLACE AIRBAG SENSOR ASSEMBLY

B

GO TO STEP 9

8.	CHECK AIRBAG SENSOR ASSEMBLY

HINT:

If continuing from step 6, begin from (a). If continuing from any other step, begin from (c).

(a) Turn the ignition switch off.

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

(c) Connect the connector to the airbag sensor assembly.

(d) Using a service wire, connect C16-1 (ICL-) and C16-2 (ICL+) of connector C.

(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 B1836, B1837 and B1838 are not output.

Text in Illustration

*1	No. 2 Floor Wire
*2	Airbag Sensor Assembly
*3	Driver Side Curtain Shield Squib
*4	Service Wire

HINT:

DTCs other than B1836, B1837 or B1838 may be output at this time, but they are not related to this check.

NG

REPLACE AIRBAG SENSOR ASSEMBLY

OK

9.	CHECK CURTAIN SHIELD AIRBAG ASSEMBLY LH (DRIVER SIDE CURTAIN SHIELD SQUIB)

HINT:

If continuing from step 11, begin from (c). If continuing from any other step, being from (a).

(a) Turn the ignition switch off.

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

(c) Disconnect the service wire from connector C.

(d) Connect the connector to the curtain shield airbag assembly LH.

(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 B1835, B1836, B1837 and B1838 are not output.

Text in Illustration

*1	Airbag Sensor Assembly
*2	Driver Side Curtain Shield Squib

HINT:

DTCs other than B1835, B1836, B1837 or B1838 may be output at this time, but they are not related to this check.

OK

USE SIMULATION METHOD TO CHECK

NG

REPLACE CURTAIN SHIELD AIRBAG ASSEMBLY LH