Lighting System Stop Light Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR DTC (BRAKE CONTROL SYSTEM)

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BATTERY)

CHECK STOP LIGHT SWITCH ASSEMBLY

CHECK HARNESS AND CONNECTOR (STOP LIGHT CONTROL ECU ASSEMBLY - BATTERY AND BODY GROUND)

CHECK STOP LIGHT

LIGHTING SYSTEM - Stop Light Circuit


DESCRIPTION

When the stop light switch is turned on, current flows to the stop lights to illuminate them. During emergency braking, the brake control system blinks all stop lights to alert following drivers and reduces the possibility of a rear-end collision.

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Lighting (Ext).Lighting System.Lighting System Stop Light Circuit


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Lighting (Ext).Lighting System.Lighting System Stop Light Circuit


INSPECTION PROCEDURE

1.CHECK FOR DTC (BRAKE CONTROL SYSTEM)

  1. Clear the DTCs (LandCruiser RM000000XHV0KDX.html for 5L-E, LandCruiser RM0000046KV016X.html for 1GR-FE, 1KD-FTV, LandCruiser RM000000XHV0KEX.html for 2TR-FE).

  1. Check for DTCs (LandCruiser RM000000XHV0KDX.html for 5L-E, LandCruiser RM0000046KV016X.html for 1GR-FE, 1KD-FTV, LandCruiser RM000000XHV0KEX.html for 2TR-FE).

    OK:
    DTC output does not occur.
    Result
    Result
    		Proceed to
    OK
    		A
    NG (for 5L-E)
    		B
    NG (for 1GR-FE, 1KD-FTV)
    		C
    NG (for 2TR-FE)
    		D


B
GO TO ANTI-LOCK BRAKE SYSTEM (LandCruiser RM000000XHU0D7X.html)

C
GO TO VEHICLE STABILITY CONTROL SYSTEM (for Hydraulic Brake Booster) (LandCruiser RM0000045Z601DX.html)

D
GO TO VEHICLE STABILITY CONTROL SYSTEM (for Vacuum Brake Booster) (LandCruiser RM000000XHU0D8X.html)
A


2.CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BATTERY)
Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Lighting (Ext).Lighting System.Lighting System Stop Light Circuit

  1. Disconnect the A85 stop light switch connector.

  1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    A85-1(B) - Body ground
    		Always
    		11 to 14 V
    Measure the resistance according to the value(s) in the table below.
    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A85-3(GND) - Body ground
    		Always
    		Below 1 Ω
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Stop Light Control ECU Assembly)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK STOP LIGHT SWITCH ASSEMBLY

  1. Temporarily replace the stop light switch with a new or normally functioning one (LandCruiser RM0000045HO00DX.html).

  1. Check the stop light operation.

    OK:
    Stop light operation is normal.


NG
Go to step 4
OK

END (STOP LIGHT SWITCH IS DEFECTIVE)

4.CHECK HARNESS AND CONNECTOR (STOP LIGHT CONTROL ECU ASSEMBLY - BATTERY AND BODY GROUND)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Lighting (Ext).Lighting System.Lighting System Stop Light Circuit

  1. Disconnect the A54 stop light control ECU connector.

  1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    A54-5 (STP) - Body ground
    		Brake pedal depressed
    		11 to 14 V
    A54-5 (STP) - Body ground
    		Brake pedal released
    		Below 1 V
    A54-6 (+B) - Body ground
    		Always
    		11 to 14 V

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

    Standard Resistance:
    Tester Connection
    		 Condition
    		Specified Condition
    A54-8 (GND) - Body ground
    		Always
    		Below 1 Ω
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Stop Light Control ECU Assembly)
    Result
    Result
    		Proceed to
    OK (Problem is that lights are flashing) (except 5L-E)
    		A
    OK (Problem is that lights do not turn on or stay on)
    		B
    NG
    		C


B
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (LandCruiser RM000002CE20QHX.html)

C
REPAIR OR REPLACE HARNESS OR CONNECTOR
A


5.CHECK STOP LIGHT

  1. With the skid control ECU connector disconnected, check the illumination of the stop lights when depressing the brake pedal.

    OK:
    Stop lights operate normally when the brake pedal is depressed.


NG
REPLACE STOP LIGHT CONTROL ECU ASSEMBLY (LandCruiser RM000003MWQ02KX.html)
OK

REPLACE SKID CONTROL ECU (LandCruiser RM0000034UX02TX.html)