Toyota Tundra. Manual — part 332

STANDARD RESISTANCE SPECIFICATION

Fig. 36: Identifying O10 Door Lock And DC ECU Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE MAIN BODY ECU

3. CHECK HARNESS AND CONNECTOR (REAR DOOR LOCK MOTOR RH - MAIN BODY

ECU)

a. Disconnect the O4 door lock connector.

b. Disconnect the DD ECU connector.

c. Measure the resistance according to the value(s) in the table below.

Standard resistance

HARNESS AND CONNECTOR (REAR DOOR LOCK MOTOR RH - MAIN BODY ECU)
STANDARD RESISTANCE SPECIFICATION

Tester Connection

Condition Specified Condition

O10-4 (L) - DC-24 (ACT+)

Always

Below 1 ohms

O10-1 (UL) - DC-23 (ACT-)

DC-24 (ACT+) - Body ground

Always

10 kohms or higher

DC-23 (ACT-) - Body ground

Tester Connection

Condition Specified Condition

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Door Lock - Tundra

Fig. 37: Identifying Rear Door Lock Motor RH And Main Body ECU Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE MAIN BODY ECU

DRIVER SIDE DOOR KEY LOCK AND UNLOCK SWITCH CIRCUIT

DESCRIPTION

The Front door key lock and unlock switch LH is built into the Front door lock motor LH. When the Front door
key cylinder LH is turned to lock all the doors using the key, there is continuity between terminals L and E of
the key lock and unlock switch. When the cylinder is turned to unlock the doors, there is continuity between
terminals UL and E. Terminals L2 and UL3 of the main body ECU are connected to the door lock motor, and
door lock/unlock request signals (by key) are input to the main body ECU. The main body ECU constantly
applies voltage to terminal L of the front door lock motor LH via terminal L2. When the front door key cylinder
LH is turned to lock all the doors using the key, current flows from terminal L2 to terminal L. The main body
ECU also applies constant voltage to terminal UL of the door lock motor via terminal UL3. When the door key
cylinder is turned to unlock the doors using the key, current flows from terminal UL3 to terminal UL.

WIRING DIAGRAM

O4-4 (L) - DD-3 (ACT+)

Always

Below 1 ohms

O4-1 (UL) - DD-2 (ACT-)

DD-3 (ACT+) - Body ground

Always

10 kohms or higher

DD-2 (ACT-) - Body ground

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Door Lock - Tundra

Fig. 38: Driver Side Door Key Lock And Unlock Switch - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. READ VALUE OF TECHSTREAM

a. Check the Data List to ensure proper functioning of the door key lock and unlock switch.

Techstream

Main Body

TECHSTREAM DATA LIST - MAIN BODY

Tester

Display

Measurement item/Range

Normal Condition

Diagnostic

Note

Door Key

SW-Lock

Driver door lock/unlock switch lock
signal (Key-linked lock switch)
/ ON or OFF

ON: Driver side door key
cylinder is turned to lock
position
OFF: Driver side door key
cylinder is not turned

-

Door Key

SW-Unlock

Driver door lock/unlock switch
unlock signal (Key-linked unlock
switch)
/ ON or OFF

ON: Driver side door key
cylinder is turned to unlock
position
OFF: Driver side door key
cylinder is not turned

-

D Door Key

SW-UL

Driver door lock/unlock switch
unlock signal (2 step key-linked
unlock switch)
/ ON or OFF

ON: Driver side door key
cylinder is turned to unlock
position
OFF: Driver side door key
cylinder is not turned

-

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Door Lock - Tundra

OK: The display is as specified in the normal condition column.

NG: Go to step 2

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE

2. INSPECT FRONT DOOR LOCK MOTOR ASSEMBLY LH (DOOR KEY LOCK AND UNLOCK

SWITCH)

a. Remove the front door lock motor LH (see REMOVAL ).

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

Standard resistance

FRONT DOOR LOCK MOTOR ASSEMBLY LH (DOOR KEY LOCK AND UNLOCK
SWITCH) STANDARD RESISTANCE SPECIFICATION

Fig. 39: Identifying Front Door Lock Motor LH Lock And Unlock Position
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPLACE FRONT DOOR LOCK MOTOR ASSEMBLY LH (see REMOVAL )

Tester Connection

Switch Condition

Specified Condition

7 (E) - 9 (L)

ON (Door lock set to LOCK)

Below 1 ohms

7 (E) - 9 (L)

7 (E) - 10 (UL)

OFF (Free)

10 kohms or higher

7 (E) - 10 (UL)

ON (Door lock set to UNLOCK)

Below 1 ohms

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Door Lock - Tundra