Toyota Tundra. Manual — part 2609

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 B1825/56, B1826/56, B1827/56, B1828/56: SHORT IN FRONT PASSENGER SIDE - SIDE SQUIB
CIRCUIT; OPEN IN FRONT PASSENGER SIDE - SIDE SQUIB CIRCUIT; SHORT TO GND IN
FRONT PASSENGER SIDE - SIDE SQUIB CIRCUIT; SHORT TO B+ IN FRONT PASSENGER SIDE
- SIDE SQUIB CIRCUIT

DESCRIPTION

The side squib RH circuit consists of the center airbag sensor and the front seat side airbag 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 side squib RH circuit.

DTC TROUBLE DETECTION CONDITION TABLE

DTC

Code

Detection Condition

Trouble Area

B1825/56

When all conditions below are met:



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



Side squib RH malfunction



Center airbag sensor malfunction



No. 2 floor wire



Front seat side airbag
assembly RH (Side squib
RH)



Center airbag sensor
assembly

B1826/56

When all conditions below are met:



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



Side squib RH malfunction



Center airbag sensor malfunction



No. 2 floor wire



Front seat side airbag
assembly RH (Side squib
RH)



Center airbag sensor
assembly

B1827/56

When all conditions below are met:



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



Side squib RH malfunction



Center airbag sensor malfunction



No. 2 floor wire



Front seat side airbag
assembly RH (Side squib
RH)



Center airbag sensor
assembly

When all conditions below are met:



No. 2 floor wire

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

WIRING DIAGRAM

Fig. 168: Identifying Side Squib Circuit - Wiring Diagram (Short In Front Passenger Side)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

B1828/56



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



Side squib RH malfunction



Center airbag sensor malfunction



Front seat side airbag
assembly RH (Side 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 ).



After the ignition switch is turned OFF, the navigation system requires
approximately 90 seconds to record various types of memory and
settings. As a result, after turning the ignition switch OFF, wait 90 seconds
or more before disconnecting the cable from the negative (-) battery
terminal.

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

HINT:



Perform the simulation method by selecting "check mode" (signal check) with the Techstream (see
CHECK MODE PROCEDURE ).



After selecting "check mode" (signal check), perform the simulation method by wiggling each connector
of the airbag system or driving the vehicle on various types of roads (see DIAGNOSIS SYSTEM ).

1. CHECK FRONT SEAT SIDE AIRBAG RH (SIDE SQUIB RH)

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 connector from the front seat side airbag RH.

d. Connect the red wire side of SST (resistance: 2.1 D) to connector C.

SST 09843-18061

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

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

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

h. Turn the ignition switch OFF.

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

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

CAUTION: Never connect the tester to the front seat side airbag RH (side

squib RH) for measurement, as this may lead to a serious injury
due to airbag deployment.

NOTE:



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



Insert SST straight into the terminals of the connector.

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

Fig. 169: Identifying Front Seat Side Airbag RH (Side Squib RH)
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.

B: REPLACE FRONT SEATBACK ASSEMBLY RH (See FRONT SEAT ASSEMBLY (FOR
MANUAL SEAT) )

C: REPLACE FRONT SEATBACK ASSEMBLY RH (See FRONT SEAT ASSEMBLY (FOR
POWER SEAT) )

Result

Proceed to

DTC B1825, B1826, B1827 or B1828 is
not output (w/ Manual Seat)

A

DTC B1825, B1826, B1827 or B1828 is
not output (w/ Power Seat)

B

DTC B1825, B1826, B1827 or B1828 is
not output (for Fold Down Seat Type)

C

DTC B1825, B1826, B1827 or B1828 is
output

D

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra