Toyota Tundra Service Manual: All Doors LOCK/UNLOCK Functions do not Operate Via Door Key Cylinder

Toyota Tundra Service Manual / Vehicle Interior / Door Lock / Power Door Lock Control System / All Doors LOCK/UNLOCK Functions do not Operate Via Door Key Cylinder

DESCRIPTION

The main body ECU (multiplex network body ECU) receives driver door key cylinder lock or unlock switch signals from the front door lock assembly LH. The main body ECU (multiplex network body ECU) activates the door lock motor on each door according to these signals.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When using the Techstream with the ignition switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Main Body. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.

PROCEDURE

1.

READ VALUE USING TECHSTREAM (Door Key SW-Lock, D Door Key SW-UL)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Main Body / Data List.

(e) Read the Data List according to the display on the Techstream.

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

OFF: Driver side door key cylinder is not turned to LOCK

-

D Door Key SW-UL

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

ON: Driver side door key cylinder is turned to UNLOCK

OFF: Driver side door key cylinder is not turned to UNLOCK

-

OK:

On the Techstream screen, ON or OFF is displayed for each item according to the table above.

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

2.

INSPECT FRONT DOOR LOCK ASSEMBLY LH

(a) Remove the front door lock assembly LH.

  • for Double Cab:

    Click here

  • for CrewMax:

    Click here

(b) Inspect the front door lock assembly LH.

  • for Double Cab:

    Click here

  • for CrewMax:

    Click here

NG

REPLACE FRONT DOOR LOCK ASSEMBLY LH

OK

3.

CHECK HARNESS AND CONNECTOR (FRONT DOOR LOCK ASSEMBLY LH - MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] AND BODY GROUND)

(a) Disconnect the N4 front door lock assembly LH connector.

(b) Disconnect the J165 main body ECU (multiplex network body ECU) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

N4-9 (L) - J165-29 (L2)

Always

Below 1 Ω

N4-10 (UL) - J165-2 (UL3)

Always

Below 1 Ω

N4-7 (E) - Body ground

Always

Below 1 Ω

N4-9 (L) or J165-29 (L2) - Body ground

Always

10 kΩ or higher

N4-10 (UL) or J165-2 (UL3) - Body ground

Always

10 kΩ or higher

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

    All Doors LOCK/UNLOCK Functions do not Operate Via Door Control Switch

    Check For Intermittent Problems

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