Toyota Tundra. Manual — part 2622



Accessories (seatback tray and seat cover, etc.) are installed.



The front passenger seat is removed from the vehicle.



The passenger airbag ON/OFF indicator (OFF) comes on when the front passenger seat is not occupied.



The vehicle is brought to the workshop for repair due to an accident or a collision.

1. ZERO POINT CALIBRATION

a. Zero point calibration procedures:

HINT:

Make sure that the zero point calibration has finished normally, and then perform the sensitivity
check.

1. Check that all of the following conditions are met:



The vehicle is parked on a level surface.



No objects are placed on the front seat RH.



The front seat inner belt RH (passenger side buckle switch) is off.

2. Adjust the seat position in accordance with the table below.

SEAT POSITION ADJUSTMENT TABLE

3. Connect the Techstream to the DLC3.

4. Turn the ignition switch ON.

5. Perform the zero point calibration by following the prompts on the screen.

HINT:



Refer to the Techstream operator's manual for further details.



If the zero point calibration has not finished normally, replace the front seat RH.

2. SENSITIVITY CHECK

a. Sensitivity check procedures:

1. Connect the Techstream to the DLC3.

2. Turn the ignition switch ON.

3. Perform the sensitivity check by following the prompts on the screen.

HINT:

Adjustment Item

Position

Slide Direction Rearmost position

Reclining Angle

Upright position

Headrest Height

Lowest position

Lifter Height

Lowest position

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

Refer to the Techstream operator's manual for further details.

4. Confirm that the beginning sensor reading is within the standard range.

Standard range:

-3.2 to 3.2 kg (-7.0 to 7.0 lb)

5. Place a 30 kg (66.2 lb) weight (e.g. a lead mass) onto the front passenger seat.

6. Confirm that the sensitivity is within the standard range.

Standard range:

27 to 33 kg (59.5 to 72.8 lb)

HINT:



When performing the sensitivity check, use a solid metal weight (the check result may
not be accurate if a liquid weight is used).



If the sensitivity deviates from the standard range, retighten the bolts of the front seat
RH taking care not to deform the seat rail. After performing this procedure, if the
sensitivity is not within the standard range, replace the front seat RH.

PROBLEM SYMPTOMS TABLE

HINT:



Use the table below to help determine the cause of the problem symptom. 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.



Inspect the fuses and relays related to this system before inspecting the suspected areas below.

Occupant classification system:

PROBLEM SYMPTOM REFERENCE TABLE

TERMINALS OF ECU

Symptom

Suspected Area

Reference

Selected passenger airbag cut-off switch position (ON or
OFF) and displayed passenger airbag ON/OFF indicator
of front seat RH occupant conditions do not correspond
(for Double Cab)

Passenger airbag
ON/OFF indicator
circuit

TROUBLE IN

PASSENGER AIRBAG

ON/OFF INDICATOR

Front seat RH occupant conditions and displayed
passenger airbag ON/OFF indicator do not correspond
(except Double Cab)

Passenger airbag
ON/OFF indicator
circuit

TROUBLE IN

PASSENGER AIRBAG

ON/OFF INDICATOR

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

1. CHECK OCCUPANT CLASSIFICATION ECU

ECU TERMINAL REFERENCE TABLE

Terminal No.

(Symbols)

Wiring

Color

Terminal Description

Condition

Specification

Y2-1 (+B) - Y2-3

(GND)*1

Q11-1 (+B) -

Q11-3 (GND)*2

R - W-B

Battery

Ignition switch ON

11 to 14 V

Y2-2 (DIA) - Y2-

3 (GND)*1

Q11-2 (DIA) -

Q11-3 (GND)*2

BR - W-B

Diagnosis (DLC3)

Ignition switch ON

Pulse

generation

Y2-3 (GND) -

Body ground*1
Q11-3 (GND) -
Body ground*2

W-B -

Body

ground

Ground

Always

Below 1 ohms

Y2-4- (FSR-) -

Y2-3 (GND)*1

Q11-4- (FSR-) -

Q11-3 (GND)*2

B - W-B

Center airbag sensor
communication ground line

Always

Below 1 ohms

Y2-5 (BGND) -

Y2-3 (GND)*1

Q11-5 (BGND) -

Q11-3 (GND)*2

O - W-B

Passenger side buckle
switch ground line

Always

Below 1 ohms

Y2-7 (IG) - Y2-3

(GND)*1

Q11-7 (IG) -

Q11-3 (GND)*2

SB - W-B Power source (IGN fuse)

Ignition switch ON

11 to 14 V

Y2-8 (FSR+) -

Y2-4 (FSR-)*1

Q11-8 (FSR+) -

Q11-4 (FSR-)*2

W - B

Center airbag sensor
communication line

Ignition switch ON

Pulse

generation

Y2-9 (BSW) -

Y2-5 (BGND)*1

Q11-9 (BSW) -

Q11-5 (BGND)*2

L - O

Passenger side buckle
switch line

Buckle switch ON

0.12 to 0.18 A

Buckle switch OFF

0.4 to 0.7 mA

Y1-1 (SGD1) -

Y2-3 (GND)*1

Y1-1 (SGD1) -

Q11-3 (GND)*2

Y - W-B

Front occupant detection
sensor LH ground line

Always

Below 1 ohms

Y1-2 (SGD2) -

Y2-3 (GND)*1

Y1-2 (SGD2) -

Q11-3 (GND)*2

SB - W-B

Front occupant detection
sensor RH ground line

Always

Below 1 ohms

Y1-3 (SGD3) -

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra

If the result is not as specified, the ECU may have a malfunction.

Fig. 201: Identifying Occupant Classification ECU Terminals

Y2-3 (GND)*1

Y1-3 (SGD3) -

Q11-3 (GND)*2

L - W-B

Rear occupant detection
sensor LH ground line

Always

Below 1 ohms

Y1-4 (SGD4) -

Y2-3 (GND)*1

Y1-4 (SGD4) -

Q11-3 (GND)*2

W - W-B

Rear occupant detection
sensor RH ground line

Always

Below 1 ohms

Y1-11 (SVC1) -

Y1-1 (SGD1)

P - Y

Front occupant detection
sensor LH power supply
line

Ignition switch ON, load is

applied to front occupant

detection sensor LH

4.5 to 5.1 V

Y1-12 (SVC2) -

Y1-2 (SGD2)

BR - SB

Front occupant detection
sensor RH power supply
line

Ignition switch ON, load is

applied to front occupant

detection sensor RH

4.5 to 5.1 V

Y1-5 (SVC3) -

Y1-3 (SGD3)

R - L

Rear occupant detection
sensor LH power supply
line

Ignition switch ON, load is

applied to rear occupant

detection sensor LH

4.5 to 5.1 V

Y1-6 (SVC4) -

Y1-4 (SGD4)

B - W

Rear occupant detection
sensor RH power supply
line

Ignition switch ON, load is

applied to rear occupant

detection sensor RH

4.5 to 5.1 V

Y1-7 (SIG1) -

Y1-1 (SGD1)

O - Y

Front occupant detection
sensor LH signal line

Ignition switch ON, load is

applied to front occupant

detection sensor LH

Pulse

generation

Y1-8 (SIG2) -

Y1-2 (SGD2)

GR - SB

Front occupant detection
sensor RH signal line

Ignition switch ON, load is

applied to front occupant

detection sensor RH

Pulse

generation

Y1-9 (SIG3) -

Y1-3 (SGD3)

G - L

Rear occupant detection
sensor LH signal line

Ignition switch ON, load is

applied to rear occupant

detection sensor LH

Pulse

generation

Y1-10 (SIG4) -

Y1-4 (SGD4)

V - W

Rear occupant detection
sensor RH signal line

Ignition switch ON, load is

applied to rear occupant

detection sensor RH

Pulse

generation

HINT:
*1: for Power Seat
*2: for Manual Seat

2009 Toyota Tundra

2009 RESTRAINTS Supplemental Restraint System - Tundra