Toyota Tundra. Manual — part 328

Fig. 20: Identifying M4 Door Lock And J3 ECU Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b. Disconnect the J3 ECU connector.

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

Standard resistance

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

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE MAIN BODY ECU

REAR DOOR UNLOCK DETECTION SWITCH LH CIRCUIT

DESCRIPTION

The rear door unlock detection switch LH is built into the rear door lock motor LH. The switch turns on when
the rear door LH is unlocked and turns off when the door is locked. The main body ECU is connected to the
rear door lock motor LH via terminal LSWL and rear door LH lock/unlock state signals are input to the ECU.

Tester Connection

Condition Specified Condition

M4-7 (LSSR) - J3-27 (LSWP) Always

Below 1 ohms

M4-7 (LSSR) - Body ground

Always

10 kohms or higher

M4-8 (E) - Body ground

Always

Below 1 ohms

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Door Lock - Tundra

The main body ECU applies voltage to the door unlock detection switch via terminal LSWL. When the door
unlock detection switch is off (there is continuity between the switch terminals), a lock state signal is input to
the ECU. When the switch is on (there is no continuity between the switch terminals), an unlock state signal is
input.

WIRING DIAGRAM

Fig. 21: Rear Door UNLOCK Switch LH - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. READ VALUE OF TECHSTREAM (UNLOCK DETECTION SWITCH)

a. Check the Data List to ensure proper functioning of the unlock detection switch.

Techstream

Main Body

TECHSTREAM DATA LIST - MAIN BODY

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

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic

Note

RL-Door Lock

Pos SW

Rear door unlock detection switch LH
signal / ON or OFF

ON: Rear left door is
unlocked
OFF: Rear left door
is locked

-

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Door Lock - Tundra

2. INSPECT REAR DOOR LOCK MOTOR ASSEMBLY LH (UNLOCK DETECTION SWITCH)

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

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

Standard resistance

REAR DOOR LOCK MOTOR ASSEMBLY LH (UNLOCK DETECTION SWITCH)
STANDARD RESISTANCE SPECIFICATION

Fig. 22: Identifying Rear Door Lock Motor Lock And Unlock Position
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

OK: Go to next step

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

ECU AND BODY GROUND)

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.

Tester Connection Switch Condition Specified Condition

9 (E) - 6 (LSSR)

Lock

10 kohms or higher

Unlock

Below 1 ohms

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Door Lock - Tundra

Standard resistance

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

Fig. 23: 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

REAR DOOR UNLOCK DETECTION SWITCH RH CIRCUIT

DESCRIPTION

The rear door unlock detection switch RH is built into the rear door lock motor RH. The switch turns on when
the rear door RH is unlocked and turns off when the door is locked. The main body ECU is connected to the
rear door lock motor RH via terminal LSWR, and rear door RH lock/unlock state signals are input to the ECU.
The main body ECU applies voltage to the door unlock detection switch via terminal LSWR. When the door
unlock detection switch is off (there is continuity between the switch terminals), a lock state signal is input to
the ECU. When the switch is on (there is no continuity between the switch terminals), an unlock state signal is

Tester Connection

Condition Specified Condition

O10-6 (LSSR) - DC-1 (LSWL) Always

Below 1 ohms

O10-6 (LSSR) - Body ground

Always

10 kohms or higher

O10-9 (E) - Body ground

Always

Below 1 ohms

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Door Lock - Tundra