Toyota Tundra. Manual — part 2615

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

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION TABLE

e. Turn the ignition switch OFF.

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

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

Fig. 182: Identifying Floor Wire (Front Pretensioner Squib LH Circuit)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

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

SYSTEM ).

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

Standard Resistance

Tester Connection

Switch Condition Specified Condition

P2-1 (L+) - Body ground

Ignition switch ON

Below 1 V

P2-2 (L-) - Body ground

Tester Connection Condition Specified Condition

P2-1 (L+) - P2-2 (L-) Always

Below 1 ohms

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

TESTER CONNECTION SPECIFIED CONDITION TABLE

NG: REPLACE FLOOR WIRE

OK: Go to next step

4. CHECK CENTER AIRBAG SENSOR

a. Connect the connectors to the front seat outer belt 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. 183: Identifying Center Airbag Sensor
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Result

RESULT TABLE

HINT:

Tester Connection

Condition Specified Condition

P2-1 (L+) - P2-2 (L-)

Always

1 Mohms or higher

P2-1 (L+) - Body ground

P2-2 (L-) - Body ground

Result

Proceed to

DTC B1900, B1901, B1902 or B1903 is
output (for Column Shift Type)

A

DTC B1900, B1901, B1902 or B1903 is
output (for Floor Shift Type)

B

DTC B1900, B1901, B1902 or B1903 is
not output

C

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

Codes other than DTC B1900, B1901, B1902, B1903 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 B1905/74, B1906/74, B1907/74, B1908/74: SHORT IN FRONT PASSENGER SIDE
PRETENSIONER SQUIB CIRCUIT; OPEN IN FRONT PASSENGER SIDE PRETENSIONER SQUIB
CIRCUIT; SHORT TO GND IN FRONT PASSENGER SIDE PRETENSIONER SQUIB CIRCUIT;
SHORT TO B+ IN FRONT PASSENGER SIDE PRETENSIONER SQUIB CIRCUIT

DESCRIPTION

The front pretensioner squib RH circuit consists of the center airbag sensor and the front seat outer belt RH.

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

These DTCs are recorded when a malfunction is detected in the front pretensioner squib RH circuit.

DTC TROUBLE DETECTION CONDITION TABLE

DTC

Code

Detection Condition

Trouble Area

B1905/74

When all conditions below are met:



The center airbag sensor receives a line short circuit
signal 5 times in the front pretensioner squib RH
circuit during primary check.



Front pretensioner squib RH malfunction



Center airbag sensor malfunction



No. 2 floor wire



Front seat outer belt
assembly RH (Front
pretensioner squib RH)



Center airbag sensor
assembly

B1906/74

When all conditions below are met:



The center airbag sensor receives an open circuit
signal in the front pretensioner squib RH circuit for
2 seconds.



Front pretensioner squib RH malfunction



Center airbag sensor malfunction



No. 2 floor wire



Front seat outer belt
assembly RH (Front
pretensioner squib RH)



Center airbag sensor
assembly

B1907/74

When all conditions below are met:



The center airbag sensor receives a short circuit to
ground signal in the front pretensioner squib RH
circuit for 0.5 seconds.



No. 2 floor wire



Front seat outer belt
assembly RH (Front
pretensioner squib RH)

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

WIRING DIAGRAM

Fig. 184: Identifying Short In Front Passenger Side Pretensioner Squib Circuit - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE



Front pretensioner squib RH malfunction



Center airbag sensor malfunction



Center airbag sensor
assembly

B1908/74

When all conditions below are met:



The center airbag sensor receives a short circuit to
B+ signal in the front pretensioner squib RH circuit
for 0.5 seconds.



Front pretensioner squib RH malfunction



Center airbag sensor malfunction



No. 2 floor wire



Front seat outer belt
assembly RH (Front
pretensioner squib RH)



Center airbag sensor
assembly

NOTE:



When disconnecting the cable from the negative (-) battery terminal while
performing repairs, some systems need to be initialized after the cable is
reconnected (see INITIALIZATION ).

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra