Toyota Tundra. Manual — part 2563

B: Go to DTC TABLE

A: Go to next step

11. CONFIRMATION TEST

NEXT : END

PROBLEM SYMPTOMS TABLE

HINT:

Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the
potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table.
Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.

Airbag system

PROBLEM SYMPTOMS TABLE

TERMINALS OF ECU

1. CENTER AIRBAG SENSOR

ECU TERMINAL REFERENCE TABLE

Symptom

Suspected Area

Reference

The SRS warning light goes off
after the primary check, but then
comes on.

SRS Warning Light Remains ON

SRS WARNING LIGHT

REMAINS ON

With the ignition switch ON, the
SRS warning light sometimes
comes on after approximately 6
seconds.

SRS Warning Light Remains ON

SRS WARNING LIGHT

REMAINS ON

The SRS warning light always
comes on even when DTC is not
output.

SRS Warning Light Remains ON

SRS WARNING LIGHT

REMAINS ON

With the ignition switch ON, the
SRS warning light does not come
on.

SRS Warning Light does not

Come ON

SRS WARNING LIGHT DOES

NOT COME ON

Although an SRS warning light
operates normally, DTC or a
normal system code is not
displayed.

Diagnosis Circuit

DIAGNOSIS CIRCUIT

Although terminals TC and CG of
DLC3 are not connected, DTC or
a normal system code is displayed.

Diagnosis Circuit

DIAGNOSIS CIRCUIT

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

Terminal No. Symbols

Destination

J46-1

P2+

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

J46-2

P2-

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

J46-3

P-

Front passenger airbag (Front passenger side squib)

J46-4

P+

Front passenger airbag (Front passenger side squib)

J46-5

D+

Steering pad (Driver side squib)

J46-6

D-

Steering pad (Driver side squib)

J46-7

D2-

Steering pad (Driver side squib 2nd step)

J46-8

D2+

Steering pad (Driver side squib 2nd step)

J46-11*

MSW+ Airbag cut-off switch

J46-12*

MSW- Airbag cut-off switch

J46-13

CANH CAN communication line

J46-16

SIL

DLC3

J46-17

P-AB Front passenger seat belt warning light (Passenger airbag ON/OFF indicator)

J46-19

RMSW RSCA off switch

J46-20

RMIL RSCA off switch indicator

J46-21

IG2

IGN fuse

J46-22

CANL CAN communication line

J46-23

PAON Passenger airbag ON/OFF indicator

J46-25

E1

Ground

J46-26

E2

Ground

J46-27

-SR

Front airbag sensor RH

J46-28

-SL

Front airbag sensor LH

J46-29

+SR

Front airbag sensor RH

J46-30

+SL

Front airbag sensor LH

P1-1

PD-

Front seat outer belt LH (Front pretensioner squib LH)

P1-2

PD+

Front seat outer belt LH (Front pretensioner squib LH)

P1-6

ICD-

Curtain shield airbag LH (Curtain shield squib LH)

P1-7

ICD+ Curtain shield airbag LH (Curtain shield squib LH)

P1-8

BBD+ Side airbag sensor LH

P1-9

SFD+ Front seat side airbag LH (Front side squib LH)

P1-10

SFD-

Front seat side airbag LH (Front side squib LH)

P1-11

DBE+ Front seat inner belt LH (Seat position airbag sensor)

P1-12

DBE- Front seat inner belt LH (Seat position airbag sensor)

P1-13

DSP-

Seat position airbag sensor

P1-14

DSP+ Seat position airbag sensor

P1-15

BBD- Side airbag sensor LH

Q1-4

PP+

Front seat outer belt RH (Front pretensioner squib RH)

Q1-5

PP-

Front seat outer belt RH (Front pretensioner squib RH)

Q1-6

SFP-

Front seat side airbag RH

Q1-7

SFP+ Front seat side airbag RH

Q1 8

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

Fig. 40: Identifying Center Airbag Sensor Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

DIAGNOSIS SYSTEM

1. SYMPTOM SIMULATION

HINT:

The most difficult case in troubleshooting is when no problem symptoms occur. In such a case, a
thorough problem analysis must be carried out. A simulation of the same or similar conditions and
environment in which the problem occurred in the customer's vehicle should be carried out. No matter
how much skill or experience a technician has, troubleshooting without confirming the problem
symptoms will lead to important repairs being overlooked and mistakes or delays.

a. Vibration method: When vibration seems to be the major cause.

HINT:

BBP+ Side airbag sensor RH

Q1-9

ICP+

Curtain shield airbag RH (Curtain shield squib RH)

Q1-10

ICP-

Curtain shield airbag RH (Curtain shield squib RH)

Q1-11

BBP- Side airbag sensor RH

Q1-12

FSP+ Occupant classification ECU

Q1-13

FSP-

Occupant classification ECU

HINT:
*: for Regular Cab

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

Perform the simulation method only during the primary check period (for approximately 6 seconds)
after the ignition switch is turned ON.

1. Slightly vibrate the part of the sensor considered to be the problem cause with your fingers

and check whether the malfunction occurs.

2. Slightly shake the connector vertically and horizontally.

3. Slightly shake the wire harness vertically and horizontally.

HINT:

The connector joint and fulcrum of the vibration are the major areas to be checked
thoroughly.

Fig. 41: Identifying Vibration Method
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

2. FUNCTION OF SRS WARNING LIGHT

a. Primary check.

1. Turn the ignition switch OFF. Wait for at least 2 seconds, then turn the ignition switch ON.

The SRS warning light comes on for approximately 6 seconds and the diagnosis of the airbag
system (including the seat belt pretensioners) is performed.

HINT:

NOTE:

Shaking the relays too strongly may result in open relays.

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra