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

Lexus NX Service Manual / Vehicle Interior / Door Lock / Power Door Lock Control System / All Doors LOCK/UNLOCK Functions do not Operate Via Door Control Switch

DESCRIPTION

The main body ECU (multiplex network body ECU) receives switch signals from the door control switch assembly on the front passenger door and activates the door lock motor on each door according to these signals.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When using the Techstream with the vehicle power 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 Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start(CAN). 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.
  • If the main body ECU (multiplex network body ECU) is replaced, refer to the Smart Access System with Push-button Start (for Entry Function).

    Click here

PROCEDURE

1.

READ VALUE USING TECHSTREAM (Door Lock SW-Lock, Door Lock SW-Unlock)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(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.

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Door Lock SW-Lock

Door control switch assembly lock signal

OFF or ON

OFF: Lock side of door control switch assembly not pushed

ON: Lock side of door control switch assembly pushed

-

Door Lock SW-Unlock

Door control switch assembly unlock signal

OFF or ON

OFF: Unlock side of door control switch assembly not pushed

ON: Unlock side of door control switch assembly pushed

-

Body Electrical > Main Body > Data List

Tester Display

Door Lock SW-Lock

Door Lock SW-Unlock

OK:

The Techstream indicates ON or OFF according to the switch operation shown in the table.

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

2.

INSPECT DOOR CONTROL SWITCH ASSEMBLY

(a) Remove the door control switch assembly.

Click here

(b) Inspect the door control switch assembly.

Click here

NG

REPLACE DOOR CONTROL SWITCH ASSEMBLY

OK

3.

CHECK HARNESS AND CONNECTOR (DOOR CONTROL SWITCH ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND BODY GROUND)

(a) Disconnect the L13 door control switch assembly connector.

(b) Disconnect the 4D instrument panel junction block assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

L13-4 (L) - 4D-42

Always

Below 1 Ω

L13-2 (UL) - 4D-55

Always

Below 1 Ω

L13-5 (E) - Body ground

Always

Below 1 Ω

L13-4 (L) or 4D-42 - Body ground

Always

10 kΩ or higher

L13-2 (UL) or 4D-55 - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Remove the instrument panel junction block assembly.

Click here

(b) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

*a

Component without harness connected

(Instrument Panel Junction Block Assembly)

-

-

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A-20 (L1) - 4D-42

Always

Below 1 Ω

A-22 (UL1) - 4D-55

Always

Below 1 Ω

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

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 Components

COMPONENTS ILLUSTRATION *1 DECK FLOOR BOX LH *2 NO. 3 DECK BOARD SUB-ASSEMBLY *3 REAR DECK FLOOR BOX *4 NEGATIVE AUXILIARY BATTERY TERMINAL N*m (kgf*cm, ft.*lbf): Specified

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 Components

COMPONENTS ILLUSTRATION *1 DECK FLOOR BOX LH *2 NO. 3 DECK BOARD SUB-ASSEMBLY *3 REAR DECK FLOOR BOX *4 NEGATIVE AUXILIARY BATTERY TERMINAL N*m (kgf*cm, ft.*lbf): Specified torque - - ILLUSTRATION *1 DISC BRAKE CYLINDER ASSEMBLY LH *2 FRONT DISC *3 F

 Components

COMPONENTS ILLUSTRATION *A w/ AVS - - *1 FRONT SKID CONTROL SENSOR WIRE LH *2 FRONT SPEED SENSOR LH N*m (kgf*cm, ft.*lbf): Specified torque - - ILLUSTRATION *A w/o AVS - - *1 FRONT SPEED SENSOR LH - - N*m (kgf*cm, ft.*lbf): Specified torqu

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