Lighting System Taillight Circuit

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK OPERATION OF FRONT LIGHT OR REAR LIGHT

PERFORM ACTIVE TEST BY INTELLIGENT TESTER

INSPECT FUSE (FR TAIL, FR CTRL-AM)

REPLACE CLEARANCE LIGHT BULB (LH OR RH)

CHECK WIRE HARNESS (ENGINE ROOM NO. 2 JUNCTION BLOCK - BATTERY)

CHECK WIRE HARNESS (ENGINE ROOM NO. 2 JUNCTION BLOCK - BODY GROUND)

PERFORM ACTIVE TEST BY INTELLIGENT TESTER

INSPECT FUSE (RR TAIL)

CHECK WIRE HARNESS (NO. 1 JUNCTION BLOCK - BATTERY)

CHECK WIRE HARNESS (NO. 1 JUNCTION BLOCK - LIGHT (TAIL INNER LH OR TAIL INNER RH) - BODY GROUND)

REPLACE REAR COMBINATION LIGHT (TAIL INNER LH OR TAIL INNER RH)

CHECK WIRE HARNESS (NO. 1 JUNCTION BLOCK - LIGHT (TAIL OUTER LH OR TAIL OUTER RH) - BODY GROUND)

REPLACE REAR COMBINATION LIGHT (TAIL OUTER LH OR TAIL OUTER RH)

CHECK WIRE HARNESS (NO. 1 JUNCTON BLOCK - LIGHT - BODY GROUND)

REPLACE LICENSE PLATE LIGHT

LIGHTING SYSTEM - Taillight Circuit


DESCRIPTION

Front light: The engine room No. 2 relay block receives taillight switch information from the combination switch, and turns on the clearance light.
Rear light: The multiplex network rear ECU receives taillight switch information from the combination switch, and turns on the taillights and license plate light.

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.Lighting.Lighting System.Lighting System Taillight Circuit


Lexus Gs430, Gs300. Uzs190 Grs190.Lighting.Lighting System.Lighting System Taillight Circuit


INSPECTION PROCEDURE

1.CHECK OPERATION OF FRONT LIGHT OR REAR LIGHT

  1. When the taillight switch is operated, check that the following lights illuminate.

    Result:

    Result
    		Proceed to
    Front lights do not illuminate
    		A
    Rear lights do not illuminate
    		B


B
Go to step 7
A


2.PERFORM ACTIVE TEST BY INTELLIGENT TESTER

  1. Select the Active Test, use the intelligent tester to generate a control command, and then check that the clearance light illuminates.


Engine room No. 2 relay block:

Item
Test Details
Diagnostic Note
Clearance light operation
Clearance light ON / OFF
-
OK:
Light illuminates.


NG
Go to step 3
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

3.INSPECT FUSE (FR TAIL, FR CTRL-AM)

  1. Remove the FR CTRL-AM fuse from the engine room No. 2 relay block.

  1. Remove the FR TAIL fuse from the engine room No. 2 junction block.

  1. Measure the resistance of the fuses.

    Standard resistance:
    Below 1 Ω


NG
REPLACE FUSE
OK


4.REPLACE CLEARANCE LIGHT BULB (LH OR RH)

  1. Temporarily replace the clearance light bulb (LH or RH) with a new or normally functioning one.

  1. Check that the bulb illuminates.

    OK:
    Clearance light bulb illuminates.


OK
END
NG


5.CHECK WIRE HARNESS (ENGINE ROOM NO. 2 JUNCTION BLOCK - BATTERY)


    Lexus Gs430, Gs300. Uzs190 Grs190.Lighting.Lighting System.Lighting System Taillight Circuit

  1. Disconnect the 2E junction block connector.

  1. Measure the voltage of the wire harness side connector.

    Standard voltage:
    Tester Connection
    		Specified Condition
    2E-1 - Body ground
    		10 to 14 V


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


6.CHECK WIRE HARNESS (ENGINE ROOM NO. 2 JUNCTION BLOCK - BODY GROUND)


    Lexus Gs430, Gs300. Uzs190 Grs190.Lighting.Lighting System.Lighting System Taillight Circuit

  1. Disconnect the 2G junction block connector.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    2G-8 - Body ground
    		Below 1 Ω
    2G-9 - Body ground
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

7.PERFORM ACTIVE TEST BY INTELLIGENT TESTER

  1. Select the Active Test, use the intelligent tester to generate a control command, and then check that the taillight and license light illuminate.

    Multiplex network rear ECU:

    Item
    		Test Details
    		Diagnostic Note
    Tail Light
    		Taillight ON / OFF
    		-
    License light
    		License light ON / OFF
    		-
    OK:
    Lights illuminate.

    Result:

    Result
    		Proceed to
    OK
    		A
    All lights do not illuminate
    		B
    Taillights (inner LH or inner RH) do not illuminate*
    		C
    Taillights (outer LH or outer RH) do not illuminate
    		D
    License plate light does not illuminate
    		E
    HINT:
    *: Without rear fog


B
Go to step 8

C
Go to step 10

D
Go to step 12

E
Go to step 14
A

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

8.INSPECT FUSE (RR TAIL)

  1. Remove the RR TAIL fuse from the No. 1 junction block assembly.

  1. Measure the resistance of the fuse.

    Standard resistance:
    Below 1 Ω


NG
REPLACE FUSE
OK


9.CHECK WIRE HARNESS (NO. 1 JUNCTION BLOCK - BATTERY)


    Lexus Gs430, Gs300. Uzs190 Grs190.Lighting.Lighting System.Lighting System Taillight Circuit

  1. Disconnect the LB junction block connector.

  1. Measure the voltage of the wire harness side connector.

    Standard voltage:
    Tester Connection
    		Specified Condition
    LB-1 (TLIN) - Body ground
    		10 to 14 V


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

10.CHECK WIRE HARNESS (NO. 1 JUNCTION BLOCK - LIGHT (TAIL INNER LH OR TAIL INNER RH) - BODY GROUND)


    Lexus Gs430, Gs300. Uzs190 Grs190.Lighting.Lighting System.Lighting System Taillight Circuit

  1. Check the wire harness between the rear combination light (tail inner LH) and No. 1 junction block, and the rear combination light (tail inner LH) and body ground.

    1. Disconnect the LA junction block connector.

    2. Disconnect the a2 combination light connector.

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

      Standard resistance:
      Tester Connection
      		Specified Condition
      LA-8 (TIL2) - a2-2 (B)
      		Below 1 Ω
      LA-8 (TIL2) or a2-2 (B) - Body ground
      		10 kΩ or higher

    4. Connect the LA junction block connector.

    5. Measure the resistance of the wire harness side connector.

      Standard resistance:
      Tester Connection
      		Specified Condition
      a2-4 (E) - Body ground
      		Below 1 Ω


    Lexus Gs430, Gs300. Uzs190 Grs190.Lighting.Lighting System.Lighting System Taillight Circuit

  1. Check the wire harness between the rear combination light (tail inner RH) and No. 1 junction block, and the rear combination light (tail inner RH) and body ground.

    1. Disconnect the LA junction block connector.

    2. Disconnect the a9 combination light connector.

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

      Standard resistance:
      Tester Connection
      		Specified Condition
      LA-22 (TIL1) - a9-2 (B)
      		Below 1 Ω
      LA-22 (TIL1) or a9-2 (B) - Body ground
      		10 kΩ or higher

    4. Connect the LA junction block connector.

    5. Measure the resistance of the wire harness side connector.

      Standard resistance:
      Tester Connection
      		Specified Condition
      a9-4 (E) - Body ground
      		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


11.REPLACE REAR COMBINATION LIGHT (TAIL INNER LH OR TAIL INNER RH)

  1. Temporarily replace the rear combination light (tail inner LH or tail inner RH) with a new or normally functioning one.

  1. Check that the rear combination light illuminates.

    OK:
    Light illuminates.


OK
END
NG

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

12.CHECK WIRE HARNESS (NO. 1 JUNCTION BLOCK - LIGHT (TAIL OUTER LH OR TAIL OUTER RH) - BODY GROUND)


    Lexus Gs430, Gs300. Uzs190 Grs190.Lighting.Lighting System.Lighting System Taillight Circuit

  1. Check the wire harness between the rear combination light (tail outer LH) and No. 1 junction block, and the rear combination light (tail outer LH) and body ground.

    1. Disconnect the LG junction block connector.

    2. Disconnect the Z1 combination light connector.

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

      Standard resistance:
      Tester Connection
      		Specified Condition
      LG-5 (TIL2) - Z1-5 (TL)
      		Below 1 Ω
      LG-5 (TIL2) or Z1-5 (TL) - Body ground
      		10 kΩ or higher

    4. Connect the LG junction block connector.

    5. Measure the resistance of the wire harness side connector.

      Standard resistance:
      Tester Connection
      		Specified Condition
      Z1-6 (E) - Body ground
      		Below 1 Ω


    Lexus Gs430, Gs300. Uzs190 Grs190.Lighting.Lighting System.Lighting System Taillight Circuit

  1. Check the wire harness between the rear combination light (tail outer RH) and No. 1 junction block, and the rear combination light (tail outer RH) and body ground.

    1. Disconnect the LG junction block connector.

    2. Disconnect the Z3 combination light connector.

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

      Standard resistance:
      Tester Connection
      		Specified Condition
      LG-5 (TIL2) - Z3-5 (TL)
      		Below 1 Ω
      LG-5 (TIL2) or Z3-5 (TL) - Body ground
      		10 kΩ or higher

    4. Connect the LG junction block connector.

    5. Measure the resistance of the wire harness side connector.

      Standard resistance:
      Tester Connection
      		Specified Condition
      Z3-6 (E) - Body ground
      		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


13.REPLACE REAR COMBINATION LIGHT (TAIL OUTER LH OR TAIL OUTER RH)

  1. Temporarily replace the rear combination light (tail outer LH or tail outer RH) with a new or normally functioning one.

  1. Check that the rear combination light illuminates.

    OK:
    Light illuminates.


OK
END
NG

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

14.CHECK WIRE HARNESS (NO. 1 JUNCTON BLOCK - LIGHT - BODY GROUND)


    Lexus Gs430, Gs300. Uzs190 Grs190.Lighting.Lighting System.Lighting System Taillight Circuit

  1. Disconnect the LA junction block connector.

  1. Disconnect the a4 license light connector.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    LA-10 (LCE1) - a4-1
    		Below 1 Ω
    LA-10 (LCE1) or a4-1 - Body ground
    		10 kΩ or higher

  1. Connect the LA junction block connector.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    a4-2 - Body ground
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


15.REPLACE LICENSE PLATE LIGHT

  1. Temporarily replace the license plate light with a new or normally functioning one.

  1. Check that the light illuminates.

    OK:
    Light illuminates.


OK
END
NG

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE