Lighting System Door Courtesy Switch Circuit

Body Electrical. Lexus Gs430, Gs300. Uzs190 Grs190
Lighting. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE OF INTELLIGENT TESTER

INSPECT DOOR COURTESY SWITCH (DRIVER SIDE)

CHECK WIRE HARNESS (DOOR COURTESY SWITCH (DRIVER SIDE) - MULTIPLEX NETWORK BODY ECU)

INSPECT DOOR COURTESY SWITCH (PASSENGER SIDE)

CHECK WIRE HARNESS (DOOR COURTESY SWITCH (PASSENGER SIDE) - MULTIPLEX NETWORK BODY ECU)

INSPECT DOOR COURTESY SWITCH (REAR LH OR REAR RH)

CHECK WIRE HARNESS (DOOR COURTESY SWITCH (REAR LH OR REAR RH) - COWL SIDE JUNCTION BLOCK RH OR MULTIPLEX NETWORK BODY ECU)

LIGHTING SYSTEM - Door Courtesy Switch Circuit


DESCRIPTION

The cowl side junction block ECU RH detects the condition of each door courtesy switch and sends a signal to each door ECU via the multiplex communication circuit.

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.Lighting.Lighting System.Lighting System Door Courtesy Switch Circuit


Lexus Gs430, Gs300. Uzs190 Grs190.Lighting.Lighting System.Lighting System Door Courtesy Switch Circuit


INSPECTION PROCEDURE

HINT:
The procedure is the same for each door courtesy switch circuit. First, inspect the suspected door courtesy switch circuit.
1.READ VALUE OF INTELLIGENT TESTER

  1. Check the Data List for proper functioning of the courtesy switch.


Multiplex network body ECU:

Item
Measurement Item / Display (Range)
Normal Condition
Diagnostic Note
D Door Curtesy SW
Driver side courtesy switch / ON or OFF
ON: Driver side door is open
OFF: Driver side door is closed
-
P Door Curtesy SW
Passenger side courtesy switch / ON or OFF
ON: Passenger side door is open
OFF: Passenger side door is closed
-
Rr Door Curtesy SW
Rear (LH or RH) courtesy switch / ON or OFF
ON: Rear door (LH or RH) is open
OFF: Rear door (LH or RH) is closed
-
OK:
Condition sign can be displayed.

Result:

Result
Proceed to
OK
A
Driver side door courtesy switch does not operate
B
Front passenger side door courtesy switch does not operate
C
Both rear door courtesy switches do not operate
D


B
Go to step 2

C
Go to step 4

D
Go to step 6
A

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

2.INSPECT DOOR COURTESY SWITCH (DRIVER SIDE)
Inspection (Click here)
OK:
Door courtesy light switch is normal.


NG
REPLACE DOOR COURTESY SWITCH (DRIVER SIDE)
OK


3.CHECK WIRE HARNESS (DOOR COURTESY SWITCH (DRIVER SIDE) - MULTIPLEX NETWORK BODY ECU)


    Lexus Gs430, Gs300. Uzs190 Grs190.Lighting.Lighting System.Lighting System Door Courtesy Switch Circuit

  1. Disconnect the V1 ECU connector.

  1. Disconnect the W7*1 or V4*2 switch connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    LHD
    Tester Connection
    		Specified Condition
    V1-14 (DCTY) - W7-1
    		Below 1 Ω
    V1-14 (DCTY) or W7-1 - Body ground
    		10 kΩ or higher
    RHD
    Tester Connection
    		Specified Condition
    V1-14 (DCTY) - V4-1
    		Below 1 Ω
    V1-14 (DCTY) or V4-1 - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

4.INSPECT DOOR COURTESY SWITCH (PASSENGER SIDE)
Inspection (Click here)
OK:
Door courtesy light switch is normal.


NG
REPLACE DOOR COURTESY SWITCH (PASSENGER SIDE)
OK


5.CHECK WIRE HARNESS (DOOR COURTESY SWITCH (PASSENGER SIDE) - MULTIPLEX NETWORK BODY ECU)


    Lexus Gs430, Gs300. Uzs190 Grs190.Lighting.Lighting System.Lighting System Door Courtesy Switch Circuit

  1. Disconnect the L68 ECU connector.

  1. Disconnect the V4*1 or W7*2 switch connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    LHD
    Tester Connection
    		Specified Condition
    L68-23 (PCTY) - V4-1
    		Below 1 Ω
    L68-23 (PCTY) or V4-1 - Body ground
    		10 kΩ or higher
    RHD
    Tester Connection
    		Specified Condition
    L68-23 (PCTY) - W7-1
    		Below 1 Ω
    L68-23 (PCTY) or W7-1 - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

6.INSPECT DOOR COURTESY SWITCH (REAR LH OR REAR RH)
Inspection (Click here)
OK:
Door courtesy light switch is normal.


NG
REPLACE DOOR COURTESY SWITCH (REAR LH OR REAR RH)
OK


7.CHECK WIRE HARNESS (DOOR COURTESY SWITCH (REAR LH OR REAR RH) - COWL SIDE JUNCTION BLOCK RH OR MULTIPLEX NETWORK BODY ECU)


    Lexus Gs430, Gs300. Uzs190 Grs190.Lighting.Lighting System.Lighting System Door Courtesy Switch Circuit

  1. Check the wire harness between the cowl side junction block RH and door courtesy switch (rear LH).

    1. Disconnect the DA junction block connector.

    2. Disconnect the W13 switch connector.

    3. Measure the resistance of the wire harness side connectors.

      Standard resistance:
      Tester Connection
      		Specified Condition
      DA-11 (LCTY) - W13-1
      		Below 1 Ω
      DA-11(LCTY) or W13-1 - Body ground
      		10 kΩ or higher


    Lexus Gs430, Gs300. Uzs190 Grs190.Lighting.Lighting System.Lighting System Door Courtesy Switch Circuit

  1. Check the wire harness between the multiplex network body ECU and door courtesy switch (rear RH).

    1. Disconnect the V1 ECU connector.

    2. Disconnect the V11 switch connector.

    3. Measure the resistance of the wire harness side connectors.

      Standard resistance:
      Tester Connection
      		Specified Condition
      V1-16 (RCTY) - V11-1
      		Below 1 Ω
      V1-16 (RCTY) or V11-1 - Body ground
      		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE