Toyota Tundra. Manual — part 327

Fig. 16: Inspecting Front Door Lock Motor Assembly LH (Unlock Detections Switch)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

OK: Go to next step

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

ECU AND BODY GROUND)

a. Disconnect the N4 door lock connector.

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Door Lock - Tundra

Fig. 17: Identifying N4 Door Lock And J4 ECU Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b. Disconnect the J4 ECU connector.

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

Standard resistance

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

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE MAIN BODY ECU

FRONT PASSENGER SIDE DOOR UNLOCK DETECTION SWITCH CIRCUIT

DESCRIPTION

The front passenger side door unlock detection switch is built into the front passenger door lock motor. The
switch turns on when the front passenger door is unlocked and turns off when the door is locked. The main
body ECU is connected to the front passenger door lock motor via terminal LSWP and front passenger door

Tester Connection

Condition Specified Condition

N4-8 (LSSR) - J4-9 (LSWD) Always

Below 1 ohms

N4-8 (LSSR) - Body ground

Always

10 kohms or higher

N4-7 (E) - Body ground

Always

Below 1 ohms

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Door Lock - Tundra

lock/unlock state signals are input to the ECU. The main body ECU applies voltage to the door unlock detection
switch via terminal LSWP. 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. 18: Front Passenger Side Door UNLOCK Switch - 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

2. INSPECT FRONT DOOR LOCK MOTOR ASSEMBLY RH (UNLOCK DETECTION SWITCH)

Tester

Display

Measurement Item/Range

Normal Condition

Diagnostic

Note

P-Door Lock

Pos SW

Front passenger side door unlock
detection switch signal / ON or OFF

ON: Front passenger
side door is unlocked
OFF: Front passenger
side door is locked

-

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Door Lock - Tundra

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

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

Standard resistance

FRONT DOOR LOCK MOTOR ASSEMBLY RH (UNLOCK DETECTION SWITCH)
STANDARD RESISTANCE SPECIFICATION

Fig. 19: Inspecting Front Door Lock Motor Assembly RH (Unlock Detection Switch)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

OK: Go to next step

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

ECU AND BODY GROUND)

a. Disconnect the M4 door lock connector.

Tester Connection Switch Condition Specified Condition

7 (LSSR) - 8 (E)

Lock

10 kohms or higher

Unlock

Below 1 ohms

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Door Lock - Tundra