Toyota Tundra. Manual — part 2610

D: REPLACE FRONT SEATBACK ASSEMBLY RH (See FRONT SEAT ASSEMBLY (FOR
FOLD DOWN SEAT TYPE) )

A: Go to next step

2. CHECK NO. 2 FLOOR WIRE (SIDE SQUIB RH CIRCUIT)

a. Turn the ignition switch OFF.

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

c. Disconnect SST from connector C.

d. Disconnect the connectors from the center airbag sensor.

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

f. Turn the ignition switch ON.

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

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION TABLE

h. Turn the ignition switch OFF.

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

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

Tester Connection

Switch Condition Specified Condition

Q9-1 (SFR+) - Body ground

Ignition switch ON

Below 1 V

Q9-2 (SFR-) - Body ground

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

Fig. 170: Identifying No. 2 Floor Wire (Side Squib RH Circuit)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

k. Release the activation prevention mechanism built into connector B (see DIAGNOSIS

SYSTEM ).

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

NG: REPLACE NO. 2 FLOOR WIRE

OK: Go to next step

3. CHECK CENTER AIRBAG SENSOR

a. Connect the connectors to the front seat side airbag RH and the center airbag sensor.

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

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

d. Clear the DTCs (see DTC CHECK/CLEAR ).

e. Turn the ignition switch OFF.

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

g. Check for DTCs (see DTC CHECK/CLEAR ).

Fig. 171: Identifying Center Airbag Sensor

Tester Connection

Condition Specified Condition

Q9-1 (SFR+) - Q9-2 (SFR-) Always

Below 1 ohms

Tester Connection

Condition Specified Condition

Q9-1 (SFR+) - Q9-2 (SFR-)

Always

1 Mohms or higher

Q9-1 (SFR+) - Body ground

Q9-2 (SFR-) - Body ground

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Result

RESULT TABLE

HINT:

Codes other than DTC B1825, B1826, B1827, B1828 maybe output at this time, but they are not
related to this check.

A: REPLACE CENTER AIRBAG SENSOR ASSEMBLY (See CENTER AIRBAG SENSOR
ASSEMBLY (for Column Shift Type) )

B: REPLACE CENTER AIRBAG SENSOR ASSEMBLY (See CENTER AIRBAG SENSOR
ASSEMBLY (for Floor Shift Type) )

C: USE SIMULATION METHOD TO CHECK (See DIAGNOSIS SYSTEM )

DTC B1830/57, B1831/57, B1832/57, B1833/57: SHORT IN DRIVER SIDE CURTAIN SHIELD SQUIB
CIRCUIT; OPEN IN DRIVER SIDE CURTAIN SHIELD SQUIB CIRCUIT; SHORT TO GND IN
DRIVER SIDE CURTAIN SHIELD SQUIB CIRCUIT; SHORT TO B+ IN DRIVER SIDE CURTAIN
SHIELD SQUIB CIRCUIT

DESCRIPTION

The curtain shield squib LH circuit consists of the center airbag sensor and the curtain shield airbag LH.

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

These DTCs are recorded when a malfunction is detected in the curtain shield squib LH circuit.

DTC TROUBLE DETECTION CONDITION TABLE

Result

Proceed to

DTC B1825, B1826, B1827 or B1828 is
output (for Column Shift Type)

A

DTC B1825, B1826, B1827 or B1828 is
output (for Floor Shift Type)

B

DTC B1825, B1826, B1827 or B1828 is
not output

C

DTC

Code

Detection Condition

Trouble Area

B1830/57

When all conditions below are met:



The center airbag sensor receives a line short circuit
signal 5 times in the curtain shield squib LH circuit



Floor wire



Curtain shield airbag
assembly LH (Curtain

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

WIRING DIAGRAM

during primary check.



Curtain shield squib LH malfunction



Center airbag sensor malfunction

shield squib LH)



Center airbag sensor
assembly

B1831/57

When all conditions below are met:



The center airbag sensor receives an open circuit
signal in the curtain shield squib LH circuit for 2
seconds.



Curtain shield squib LH malfunction



Center airbag sensor malfunction



Floor wire



Curtain shield airbag
assembly LH (Curtain
shield squib LH)



Center airbag sensor
assembly

B1832/57

When all conditions below are met:



The center airbag sensor receives a short circuit to
ground signal in the curtain shield squib LH circuit
for 0.5 seconds.



Curtain shield squib LH malfunction



Center airbag sensor malfunction



Floor wire



Curtain shield airbag
assembly LH (Curtain
shield squib LH)



Center airbag sensor
assembly

B1833/57

When all conditions below are met:



The center airbag sensor receives a short circuit to
B+ signal in the curtain shield squib LH circuit for
0.5 seconds.



Curtain shield squib LH malfunction



Center airbag sensor malfunction



Floor wire



Curtain shield airbag
assembly LH (Curtain
shield squib LH)



Center airbag sensor
assembly

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra