Toyota Tundra. Manual — part 2607

Result

RESULT TABLE

HINT:

Codes other than DTC B1815, B1816, B1817, B1818 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 )

5. CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR - INSTRUMENT PANEL

WIRE ASSEMBLY)

a. Restore the released activation prevention mechanism of connector B to the original condition.

b. Disconnect the instrument panel wire connector from the instrument panel wire assembly.

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

d. Turn the ignition switch ON.

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

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION TABLE

f. Turn the ignition switch OFF.

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

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

Standard Resistance

Result

Proceed to

DTC B1815, B1816, B1817 or B1818 is
output (for Column Shift Type)

A

DTC B1815, B1816, B1817 or B1818 is
output (for Floor Shift Type)

B

DTC B1815, B1816, B1817 or B1818 is
not output

C

Tester Connection Switch Condition Specified Condition

JI1-3 - Body ground

Ignition switch ON

Below 1 V

JI1-4 - Body ground

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

TESTER CONNECTION SPECIFIED CONDITION TABLE

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

SYSTEM ).

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

Fig. 163: Identifying Instrument Panel Wire
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPLACE INSTRUMENT PANEL WIRE

OK: REPLACE INSTRUMENT PANEL WIRE ASSEMBLY

DTC B1820/55, B1821/55, B1822/55, B1823/55: SHORT IN FRONT DRIVER SIDE - SIDE SQUIB
CIRCUIT; OPEN IN FRONT DRIVER SIDE - SIDE SQUIB CIRCUIT; SHORT TO GND IN FRONT
DRIVER SIDE - SIDE SQUIB CIRCUIT; SHORT TO B+ IN FRONT DRIVER SIDE - SIDE SQUIB

Tester Connection Condition Specified Condition

JI1-3 - JI1-4

Always

Below 1 ohms

Tester Connection Condition Specified Condition

JI1-3 - JI1-4

Always

1 Mohms or higher

JI1-3 - Body ground
JI1-4 - Body ground

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

CIRCUIT

DESCRIPTION

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

DTC TROUBLE DETECTION CONDITION TABLE

WIRING DIAGRAM

DTC

Code

Detection Condition

Trouble Area

B1820/55

When all conditions below are met:



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



Side squib LH malfunction



Center airbag sensor malfunction



Floor wire



Front seat side airbag
assembly LH (Side squib
LH)



Center airbag sensor
assembly

B1821/55

When all conditions below are met:



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



Side squib LH malfunction



Center airbag sensor malfunction



Floor wire



Front seat side airbag
assembly LH (Side squib
LH)



Center airbag sensor
assembly

B1822/55

When all conditions below are met:



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



Side squib LH malfunction



Center airbag sensor malfunction



Floor wire



Front seat side airbag
assembly LH (Side squib
LH)



Center airbag sensor
assembly

B1823/55

When all conditions below are met:



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



Side squib LH malfunction



Center airbag sensor malfunction



Floor wire



Front seat side airbag
assembly LH (Side squib
LH)



Center airbag sensor
assembly

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

Fig. 164: Identifying Side Squib Circuit - Wiring Diagram (Short In Front Driver Side)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

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 ).

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