Toyota Tundra. Manual — part 2476

Fig. 15: Identifying ECU Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

a. Disconnect the J2, J3, J4, DA, DB, DC and DD ECU connectors.

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

CHECK MAIN BODY ECU VOLTAGE AND RESISTANCE

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Lighting - Tundra

Terminal No.

(Symbols)

Wiring

Color

Terminal Description

Condition

Specified

Condition

DB-13 (BECU) -

Body ground

GR - Body

ground

BECU power supply

Always

11 to 14 V

DA-1 (ACC) -

Body ground

B - Body

ground

ACC power supply

Always

11 to 14 V

DA-1 (IG) - Body

ground

B - Body

ground

IG power supply

Always

11 to 14 V

DA-1 (TRLY) -

Body ground

B - Body

ground

Taillight power supply

Always

11 to 14 V

DD-62 (GND1) -

Body ground

W-B - Body

ground

Body ground

Always

Below 1 ohms

DD-62 (GND2) -

Body ground

W-B - Body

ground

Body ground

Always

Below 1 ohms

J4-24 (DCTY) -

Body ground

BR - Body

ground

Front door courtesy light

switch LH signal

Front door LH open Below 1 ohms

J4-24 (DCTY) -

Body ground

BR - Body

ground

Front door courtesy light

switch LH signal

Front door LH closed

10 kohms or

higher

J3-21 (PCTY) -

Body ground

O - Body

ground

Front door courtesy light

switch RH signal

Front door RH open Below 1 ohms

J3-21 (PCTY) -

Body ground

O - Body

ground

Front door courtesy light

switch RH signal

Front door RH closed

10 kohms or

higher

DC-2 (LCTY) -

Body ground

B - Body

ground

Rear door courtesy light

switch LH signal

Rear door LH open Below 1 ohms

DC-2 (LCTY) -

Body ground

B - Body

ground

Rear door courtesy light

switch LH signal

Rear door LH closed

10 kohms or

higher

J3-25 (RRCY) -

Body ground

L - Body

ground

Rear door courtesy light

switch RH signal

Rear door RH open Below 1 ohms

J3-25 (RRCY) -

Body ground

L - Body

ground

Rear door courtesy light

switch RH signal

Rear door RH closed

10 kohms or

higher

J4-23 (TAIL) -

Body ground

O - Body

ground

Light control switch

TAIL signal

Light control switch

TAIL

Below 1 ohms

J4-23 (TAIL) -

Body ground

O - Body

ground

Light control switch

TAIL signal

Light control switch

except TAIL

10 kohms or

higher

J3-17 (HEAD) -

Body ground

W - Body

ground

Light control switch

HEAD signal

Light control switch

HEAD

Below 1 ohms

J3-17 (HEAD) -

Body ground

W - Body

ground

Light control switch

HEAD signal

Light control switch

except HEAD

10 kohms or

higher

J4-21 (A) - Body

ground

G - Body

ground

Light control switch

AUTO signal

Light control switch

AUTO

Below 1 ohms

J4-21 (A) - Body

ground

G - Body

ground

Light control switch

AUTO signal

Light control switch

except AUTO

10 kohms or

higher

J3-28 (FFOG) -

Body ground

P - Body

ground

Front fog light switch

signal

Front fog light switch

ON

Below 1 ohms

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Lighting - Tundra

If the result is not as specified, there may be a malfunction on the wire harness side.

c. Reconnect the J2, J3, J4, DA, DB, DC and DD ECU connectors.

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

CHECK MAIN BODY ECU VOLTAGE

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

DTC CHECK / CLEAR

J3-28 (FFOG) -

Body ground

P - Body

ground

Front fog light switch

signal

Front fog light switch

OFF

10 kohms or

higher

J2-4 (HAZ) - Body

ground

O - Body

ground

Hazard warning signal

switch input signal

Hazard warning

signal switch ON

Below 1 ohms

J2-4 (HAZ) - Body

ground

O - Body

ground

Hazard warning signal

switch input signal

Hazard warning

signal switch OFF

10 kohms or

higher

J3-9 (CGSW) -

Body ground

BR - Body

ground

Cargo light switch signal

Cargo light switch

ON

Below 1 ohms

J3-9 (CGSW) -

Body ground

BR - Body

ground

Cargo light switch signal

Cargo light switch

DOOR

10 kohms or

higher

J3-9 (CGSW) -

Body ground

BR - Body

ground

Cargo light switch signal

Cargo light switch

OFF

10 kohms or

higher

Terminal No.

(Symbols)

Wiring

Color

Terminal

Description

Condition

Specified

Condition

J4-4 (FFGO) -

Body ground

SB - Body

ground

Front fog light

signal

Light control switch TAIL,

front fog light switch ON

Below 1 V

J4-4 (FFGO) -

Body ground

SB - Body

ground

Front fog light

signal

Light control switch TAIL,

front fog light switch OFF

11 to 14 V

DB-18 (HRLY) -

Body ground

L - Body

ground

Headlight low

beam signal

Light control switch HEAD,

dimmer switch Low

Below 1 V

DB-18 (HRLY) -

Body ground

L - Body

ground

Headlight low

beam signal

Light control switch HEAD,

dimmer switch except Low

11 to 14 V

DB-16 (DIM) -

Body ground

R - Body

ground

Headlight low

beam signal

Light control switch HEAD,

dimmer switch High

Below 1 V

DB-16 (DIM) -

Body ground

R - Body

ground

Headlight low

beam signal

Light control switch HEAD,

dimmer switch except High

11 to 14 V

J2-14 (CGLP) -

Body ground

LG - Body

ground

Cargo light signal

Cargo light switch OFF

Below 1 V

J2-14 (CGLP) -

Body ground

LG - Body

ground

Cargo light signal

Cargo light switch DOOR,

door is closed

11 to 14 V

J2-14 (CGLP) -

Body ground

LG - Body

ground

Cargo light signal

Cargo light switch DOOR,

door is open

Below 1 V

J2-14 (CGLP) -

Body ground

LG - Body

ground

Cargo light signal

Cargo light switch ON

Below 1 V

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Lighting - Tundra

1. CHECK DTC

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch ON.

c. Turn the tester on.

d. Enter the following menus:

1. Techstream - Select: Body / Main Body / Trouble Codes.

e. Read the DTCs.

2. CLEAR DTC

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch ON.

c. Turn the tester on.

1. Techstream - Select: Body / Main Body / Trouble Codes.

d. Erase the DTCs.

DATA LIST / ACTIVE TEST

1. DATA LIST

HINT:

Using the Techstream to read the DATA LIST allows 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 the Techstream to the DLC3.

b. Turn the ignition switch ON.

c. Turn the tester on.

d. Enter the following menus:

1. Techstream - Select: Body / Main Body / Data List.

e. According to the display on tester, read the "DATA LIST".

Techstream

Main Body

MAIN BODY - DATA LIST CHART

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.

Tester

Display

Measurement Item/Range

Normal Condition

Diagnostic

Note

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Lighting - Tundra