Toyota Tundra. Manual — part 331

Fig. 32: Identifying M4 Door Lock And DD ECU Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE MAIN BODY ECU

REAR DOOR LOCK MOTOR CIRCUIT

DESCRIPTION

The main body ECU controls the rear door lock motor to lock/unlock the rear door. This ECU applies current
from terminal ACT+ to terminal ACT - to operate the motor to lock the door. It reverses the direction of the
current flow to operate the motor to unlock the door.

WIRING DIAGRAM

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Door Lock - Tundra

Fig. 33: Rear Door Lock Motor - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. INSPECT REAR DOOR LOCK MOTOR ASSEMBLY

a. Remove the rear door lock motor (see REMOVAL ).

b. Apply battery voltage and check operation of the door lock motor.

OK

for Rear LH

REAR DOOR LOCK MOTOR ASSEMBLY MEASUREMENT CONDITION LH

Measurement Condition

Specified Condition

Battery positive (+) --> Terminal 4 (L)

Battery negative (-) --> Terminal 1 (UL)

Lock

Battery positive (+) --> Terminal 1 (UL)

Battery negative (-) --> Terminal 4 (L)

Unlock

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Door Lock - Tundra

Fig. 34: Identifying Rear Door Lock Motor LH Lock And Unlock Position LH
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

c. Remove the rear door lock motor (see REMOVAL ).

d. Apply battery voltage and check operation of the door lock motor.

OK

for Rear RH

REAR DOOR LOCK MOTOR ASSEMBLY MEASUREMENT CONDITION RH

Measurement Condition

Specified Condition

Battery positive (+) --> Terminal 4 (L)

Battery negative (-) --> Terminal 1 (UL)

Lock

Battery positive (+) --> Terminal 1 (UL)

Battery negative (-) --> Terminal 4 (L)

Unlock

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Door Lock - Tundra

Fig. 35: Identifying Rear Door Lock Motor RH Lock And Unlock Position RH
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Result

REAR DOOR LOCK MOTOR ASSEMBLY RESULT REFERENCE

B: Go to step 3

C: REPLACE REAR DOOR LOCK MOTOR ASSEMBLY (see REMOVAL )

A: Go to next step

2. CHECK HARNESS AND CONNECTOR (REAR DOOR LOCK MOTOR LH - MAIN BODY

ECU)

a. Disconnect the O10 door lock connector.

b. Disconnect the DC ECU connector.

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

Standard resistance

HARNESS AND CONNECTOR (REAR DOOR LOCK MOTOR LH - MAIN BODY ECU)

Result

Proceed to

OK (Rear door lock motor LH)

A

OK (Rear door lock motor RH)

B

NG

C

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Door Lock - Tundra