Toyota Tundra. Manual — part 324

Fig. 4: Identifying Main Body ECU (Driver Side Junction Block) Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

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

MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK)

Terminal No. Wiring

Terminal

Condition

Specified Condition

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Door Lock - Tundra

(Symbols)

Color

Description

J4-9 (LSWD) -

Body ground

P - Body

ground

Front door unlock

detection switch

LH input

Front door LH UNLOCK

Below 1 V

Front door LH LOCK

11 to 14 V (or pulse

generation [see step 1,

waveform 1 or step 2,

waveform 2])

J3-27 (LSWP) -

Body ground

V - Body

ground

Front door unlock

detection switch

RH input

Front door RH UNLOCK

Below 1 V

Front door RH LOCK

11 to 14 V (or pulse

generation [see step 3,

waveform 3 or step 4,

waveform 4])

DC-1 (LSWL) -

Body ground

GR -

Body

ground

Rear door unlock

detection switch

LH input

Rear door LH UNLOCK

Below 1 V

Rear door LH LOCK

11 to 14 V (or pulse

generation [see step 5,

waveform 5 or step 6,

waveform 6])

J3-5 (LSWR) -

Body ground

Y - Body

ground

Rear door unlock

detection switch

RH input

Rear door RH UNLOCK

Below 1 V

Rear door RH LOCK

11 to 14 V (or pulse

generation [see step 7,

waveform 7 or step 8,

waveform 8])

DD-3 (ACT+) -

Body ground

W - Body

ground

Door lock motor

LOCK drive

output

Door control switch or

front door key cylinder

LH OFF

Below 1 V

Door control switch or

front door key cylinder

LH LOCK

11 to 14 V

J4-5 (ACTD) -

Body ground

P - Body

ground

Door lock motor

UNLOCK drive

output

Door control switch or

front door key cylinder

LH UNLOCK

11 to 14 V

Door control switch or

front door key cylinder

LH OFF

Below 1 V

DD-2 (ACT-) -

Body ground

L - Body

ground

Door lock motor

UNLOCK drive

output

Door control switch or

front door key cylinder

LH UNLOCK

11 to 14 V

Door control switch or

front door key cylinder

LH OFF

Below 1 V

DC-24 (ACT+)

- Body ground

W - Body

ground

Door lock motor

LOCK drive

output

Door control switch or

front door key cylinder

LH OFF

Below 1 V

Door control switch or

front door key cylinder

LH LOCK

11 to 14 V

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Door Lock - Tundra

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

1. Using an oscilloscope, check the waveform 1.

Waveform 1 (Reference)

WAVEFORM 1 REFERENCE

DC-23 (ACT-) -

Body ground

L - Body

ground

Door lock motor

UNLOCK drive

output

Door control switch or

front door key cylinder

LH UNLOCK

11 to 14 V

Door control switch or

front door key cylinder

LH OFF

Below 1 V

DD-53 (L2) -

Body ground

V - Body

ground

Front door key

switch LH LOCK

input

Front door key cylinder

LH LOCK

Below 1 V

Ignition switch OFF, all

doors closed and front

door key cylinder LH

neutral position

11 to 14 V (or pulse

generation [see step 9,

waveform 9 or step 10,

waveform 10])

J4-10 (UL3) -

Body ground

B - Body

ground

Front door key

switch LH

UNLOCK input

Front door key cylinder

LH UNLOCK

Below 1 V

Ignition switch OFF, all

doors closed and front

door key cylinder LH

neutral position

11 to 14 V (or pulse

generation [see step 9,

waveform 9 or step 10,

waveform 10])

DD-49 (L1) -

Body ground

W - Body

ground

Door control

switch LOCK

input

Door control switch OFF

10 kohms or higher

Door control switch

LOCK

Below 1 ohms

DD-52 (UL1) -

Body ground

B - Body

ground

Front door control

switch LH

UNLOCK input

Front door control switch

LH OFF

10 kohms or higher

Front door control switch

LH UNLOCK

Below 1 ohms

DD-40 (UL1) -

Body ground

W - Body

ground

Front door control

switch RH

UNLOCK input

Front door control switch

RH OFF

10 kohms or higher

Front door control switch

RH UNLOCK

Below 1 ohms

DD-62 (GND1,

GND2) - Body

ground

W-B -

Body

ground

Power ground

Always

Below 1 ohms

DB-13 (BECU)

- Body ground

GR -

Body

ground

+B power source

(signal system)

Always

11 to 14 V

Item

Content

Terminal No. (Symbols) J4-9 (LSWD) - Body ground

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Door Lock - Tundra

Fig. 5: Identifying Waveform Graph 1
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

2. Using an oscilloscope, check the waveform 2.

WAVEFORM 2 REFERENCE

Fig. 6: Identifying Waveform Graph 2
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

3. Using an oscilloscope, check the waveform 3.

Waveform 3 (Reference)

WAVEFORM 3 REFERENCE

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

Front door LH LOCK

Item

Content

Terminal No. (Symbols) J4-9 (LSWD) - Body ground

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

Front door RH LOCK

Item

Content

Terminal No. (Symbols) J3-27 (LSWP) - Body ground

Tool Setting

5 V/DIV., 20 ms/DIV.

Condition

Front door RH LOCK

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Door Lock - Tundra