Toyota Tundra. Manual — part 2524

TERMINALS OF ECU

1. CHECK COMBINATION METER (METER ECU)

Fig. 4: Identifying Combination Meter (Meter ECU) Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

a. Measure the resistance and voltage according to the value(s) in the table below.

COMBINATION METER (METER ECU) CONNECTOR TERMINALS RESISTANCE
CHART

Wire harness

FRONT PASSENGER SIDE
SEAT BELT WARNING
LIGHT MALFUNCTION

Integration control and panel

FRONT PASSENGER SIDE
SEAT BELT WARNING
LIGHT MALFUNCTION

Front seat inner belt RH

FRONT PASSENGER SIDE
SEAT BELT WARNING
LIGHT MALFUNCTION

Terminal No.

(Symbols)

Wiring

Color

Terminal Description

Condition

Specified Condition

J28-18 (B) -

Body ground

LG -

Body

ground

Power source

Always

11 to 14 V

J28-15 (P/SB) -

Body ground

L - Body

ground

Front passenger side
seat belt warning light
signal

Front passenger side
seat is occupied, seat
belt is fastened

Below 1 V

Front passenger side
seat is occupied, seat
belt is unfastened

Alternating between
11 to 14 V and below
1 V

J28-31 (TX+) -

Body ground

Y - Body

ground

Accessory meter input

signal

Ignition switch ON

Local communication

signal

2009 Toyota Tundra

2009 RESTRAINTS Seat Belt - Tundra

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

2. CHECK INTEGRATION CONTROL AND PANEL

Fig. 5: Identifying Integration Control And Panel Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

INTEGRATION CONTROL AND PANEL CONNECTOR TERMINALS VOLTAGE CHART

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

3. CENTER AIRBAG SENSOR

J28-33 (CANH)

- J28-34

(CANL)

SB - W

Driver side seat belt
warning light signal

(CAN signal)

Ignition switch OFF

108 to 132 ohms

J28-33 (CANH)

- J28-40 (E1)

SB - W-B

Driver side seat belt
warning light signal

(CAN signal)

Ignition switch OFF

200 ohms or higher

J28-34 (CANL)

- J28-40 (E1)

W - W-B

Driver side seat belt
warning light signal

(CAN signal)

Ignition switch OFF

200 ohms or higher

J28-40 (E1) -

Body ground

W-B -

Body

ground

Ground

Always

Below 1 ohms

Terminal No.

(Symbols)

Wiring

Color

Terminal Description

Condition

Specified Condition

J37-16 (IG+) -

Body ground

SB - Body

ground

Power source

Always

11 to 14 V

J37-14 (PBEW)

- Body ground

SB - Body

ground

Front passenger side
seat belt warning light
signal

Front passenger side seat
is occupied, seat belt is
fastened

Below 1 V

Front passenger side seat
is occupied, seat belt is
unfastened

Alternating between
11 to 14 V and below
1 V

2009 Toyota Tundra

2009 RESTRAINTS Seat Belt - Tundra

Fig. 6: Identifying Airbag Sensor Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

AIRBAG SENSOR CONNECTOR TERMINALS REFERENCE CHART

4. CHECK OCCUPANT CLASSIFICATION ECU

Fig. 7: Identifying Occupant Classification ECU Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

a. Measure the voltage and resistance according to the value(s) in the table below.

OCCUPANT CLASSIFICATION ECU TERMINALS VOLTAGE CHART

Terminal No. Terminal Symbol

Destination

J46-13

FSR+

Occupant classification ECU

J46-22

FSR-

Occupant classification ECU

P1-11

LBE+

Front seat inner belt LH (Seat belt buckle switch LH)

P1-12

LBE+

Front seat inner belt LH (Seat belt buckle switch LH)

Terminal No.

(Symbols)

Wiring Color

Terminal Description

Condition

Specified

Condition

Y2-1 (+B) - Body

ground

G - Body

ground

Power source

Always

11 to 14 V

Y2-7 (IG) - Body

ground

SB - Body

ground

Occupant classification
ECU +B line

Ignition switch

ON

11 to 14 V

2009 Toyota Tundra

2009 RESTRAINTS Seat Belt - Tundra

w/o Power Seat:

OCCUPANT CLASSIFICATION ECU TERMINALS VOLTAGE CHART (W/O POWER
SEAT)

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

DATA LIST / ACTIVE TEST

1. READ DATA LIST

HINT:

Using Techstream to read the Data List allows the values or states of switches, sensors, actuators and
other items to be read without removing any parts. This non-intrusive inspection can be very useful
because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading
the Data List information early in troubleshooting is one way to save diagnostic time.

a. Connect Techstream to the DLC3.

b. Turn the ignition switch ON.

c. Turn the tester ON.

d. Enter the following menus:

Y2-4 (FSR-) - Y2-8

(FSR+)

B - W

Pressure sensor signal line

Ignition switch

ON

Below 1 to 5 V

Y2-9 (BSW) - Y2-5

(BGND)

L - O

Passenger side buckle
switch line

Ignition switch

ON

Pulse generation

Y2-3 (GND) - Body

ground

W-B - Body

ground

Ground

Always

Below 1 ohms

Terminal No.

(Symbols)

Wiring Color

Terminal Description

Condition

Specified

Condition

Q11-1 (+B) - Body

ground

R - Body

ground

Power source

Always

11 to 14 V

Q11-7 (IG) - Body

ground

SB - Body

ground

Occupant classification
ECU +B line

Ignition switch

ON

11 to 14 V

Q11-4 (FSR-) - Q11-8

(FSR+)

B - W

Pressure sensor signal line

Ignition switch

ON

Below 1 to 5 V

Q11-9 (BSW) - Q11-5

(BGND)

L - O

Passenger side buckle
switch line

Ignition switch

ON

Pulse generation

Q11-3 (GND) - Body

ground

W-B - Body

ground

Ground

Always

Below 1 ohms

NOTE:

In the table below, the values listed under "Normal Condition" are
reference values. Do not depend solely on these reference values when
deciding whether a part is faulty or not.

2009 Toyota Tundra

2009 RESTRAINTS Seat Belt - Tundra