Toyota Tundra. Manual — part 2605

Codes other than DTC B1810, B1811, B1812, B1813 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 - SPIRAL CABLE)

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

b. Disconnect the instrument panel wire connector from the spiral cable.

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

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

Tester Connection Switch Condition Specified Condition

J11-3 - Body ground

Ignition switch ON

Below 1 V

J11-4 - Body ground

Tester Connection Condition Specified Condition

J11-3 - J11-4

Always

Below 1 ohms

Tester Connection Condition Specified Condition

J11-3 - J11-4

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

Fig. 158: Identifying Instrument Panel Wire (Center Airbag Sensor - Spiral Cable)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPLACE INSTRUMENT PANEL WIRE ASSEMBLY

OK: REPLACE SPIRAL CABLE (See SPIRAL CABLE )

DTC B1815/54, B1816/54, B1817/54, B1818/54: SHORT IN FRONT PASSENGER SIDE SQUIB 2ND
STEP CIRCUIT; OPEN IN FRONT PASSENGER SIDE SQUIB 2ND STEP CIRCUIT; SHORT TO
GND IN FRONT PASSENGER SIDE SQUIB 2ND STEP CIRCUIT; SHORT TO B+ IN FRONT
PASSENGER SIDE SQUIB 2ND STEP CIRCUIT

DESCRIPTION

The front passenger side squib 2nd step circuit consists of the center airbag sensor and the front passenger
airbag.

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

These DTCs are recorded when a malfunction is detected in the front passenger side squib 2nd step circuit.

DTC TROUBLE DETECTION CONDITION TABLE

J11-3 - Body ground

Always

1 Mohms or higher

J11-4 - Body ground

DTC

Detection Condition

Trouble Area

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

WIRING DIAGRAM

Code

B1815/54

When all conditions below are met:



The center airbag sensor receives a line short circuit
signal 5 times in the front passenger side squib 2nd
step circuit during primary check.



Front passenger side squib 2nd step malfunction



Center airbag sensor malfunction



Instrument panel wire



Instrument panel wire
assembly



Front passenger airbag
assembly (Front passenger
side squib 2nd step)



Center airbag sensor
assembly

B1816/54

When all conditions below are met:



The center airbag sensor receives an open circuit
signal in the front passenger side squib 2nd step
circuit for 2 seconds.



Front passenger side squib 2nd step malfunction



Center airbag sensor malfunction



Instrument panel wire



Instrument panel wire
assembly



Front passenger airbag
assembly (Front passenger
side squib 2nd step)



Center airbag sensor
assembly

B1817/54

When all conditions below are met:



The center airbag sensor receives a short circuit to
ground signal in the front passenger side squib 2nd
step circuit for 0.5 seconds.



Front passenger side squib 2nd step malfunction



Center airbag sensor malfunction



Instrument panel wire



Instrument panel wire
assembly



Front passenger airbag
assembly (Front passenger
side squib 2nd step)



Center airbag sensor
assembly

B1818/54

When all conditions below are met:



The center airbag sensor receives a short circuit to
B+ signal in the front passenger side squib 2nd step
circuit for 0.5 seconds.



Front passenger side squib 2nd step malfunction



Center airbag sensor malfunction



Instrument panel wire



Instrument panel wire
assembly



Front passenger airbag
assembly (Front passenger
side squib 2nd step)



Center airbag sensor
assembly

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

Fig. 159: Identifying Short In Front Passenger Side Squib 2nd Step - Wiring Diagram
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 ).

1. CHECK FRONT PASSENGER AIRBAG (FRONT PASSENGER SIDE SQUIB 2ND STEP)

a. Turn the ignition switch OFF.

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