Toyota Tundra. Manual — part 2603

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

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

JI1-1 - Body ground

Ignition switch ON

Below 1 V

JI1-2 - Body ground

Tester Connection Condition Specified Condition

JI1-1 - JI1-2

Always

Below 1 ohms

Tester Connection Condition Specified Condition

JI1-1 - JI1-2

Always

1 Mohms or higher

JI1-1 - Body ground
JI1-2 - Body ground

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

Fig. 153: Identifying Instrument Panel Wire (Center Airbag Sensor - Instrument Panel)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPLACE INSTRUMENT PANEL WIRE

OK: REPLACE INSTRUMENT PANEL WIRE ASSEMBLY

DTC B1810/53, B1811/53, B1812/53, B1813/53: SHORT IN DRIVER SIDE SQUIB 2ND STEP
CIRCUIT; OPEN IN DRIVER SIDE SQUIB 2ND STEP CIRCUIT; SHORT TO GND IN DRIVER
SIDE SQUIB 2ND STEP CIRCUIT; SHORT TO B+ IN DRIVER SIDE SQUIB 2ND STEP CIRCUIT

DESCRIPTION

The driver side squib 2nd step circuit consists of the center airbag sensor, the spiral cable and the steering pad.

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

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

DTC TROUBLE DETECTION CONDITION TABLE

DTC

Code

Detection Condition

Trouble Area

B1810/53

When all conditions below are met:



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



Instrument panel wire



Spiral cable



Steering pad (Driver
side squib 2nd step)

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

WIRING DIAGRAM



Driver side squib 2nd step malfunction



Spiral cable malfunction



Center airbag sensor malfunction



Center airbag sensor
assembly

B1811/53

When all conditions below are met:



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



Driver side squib 2nd step malfunction



Spiral cable malfunction



Center airbag sensor malfunction



Instrument panel wire



Spiral cable



Steering pad (Driver
side squib 2nd step)



Center airbag sensor
assembly

B1812/53

When all conditions below are met:



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



Driver side squib 2nd step malfunction



Spiral cable malfunction



Center airbag sensor malfunction



Instrument panel wire



Spiral cable



Steering pad (Driver
side squib 2nd step)



Center airbag sensor
assembly

B1813/53

When all conditions below are met:



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



Driver side squib 2nd step malfunction



Spiral cable malfunction



Center airbag sensor malfunction



Instrument panel wire



Spiral cable



Steering pad (Driver
side squib 2nd step)



Center airbag sensor
assembly

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

Fig. 154: Identifying Short In Driver Side Squib 2nd Step Circuit - 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 STEERING PAD (DRIVER SIDE SQUIB 2ND STEP)

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