Entry And Start System Engine Switch Indicator Circuit

Engine. Lexus Gs430, Gs300. Uzs190 Grs190
3Gr-Fse Starting. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT ENGINE SWITCH

CHECK WIRE HARNESS (ENGINE SWITCH - POWER SOURCE CONTROL ECU AND BODY GROUND)

ENTRY AND START SYSTEM - Engine Switch Indicator Circuit


DESCRIPTION

Engine start conditions or system malfunctions can be checked by the status of the engine switch indicator light.

Engine switch indicator light condition
Power Source Mode/Condition
Indicator Light Condition
Brake pedal released
Brake pedal depressed, shift lever in P or N
off
OFF
Illuminates ON (Green)
on (ACC, IG)
Illuminates ON (Amber)
Illuminates ON (Green)
Engine running
OFF
OFF
Steering lock not unlocked
Flashes (Green) for 30 sec.
Flashes (Green) for 30 sec.
System malfunction
Flashes (Amber) for 15 sec.
Flashes (Amber) for 15 sec.

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Starting.Starting System.Entry And Start System Engine Switch Indicator Circuit


INSPECTION PROCEDURE

1.INSPECT ENGINE SWITCH
Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Starting.Starting System.Entry And Start System Engine Switch Indicator Circuit

  1. Remove the engine switch.

  1. Apply battery voltage between the terminals of the switch, and check the illumination condition of the switch.

    NOTICE:
    1. If the positive (+) lead and the negative (-) lead are incorrectly connected, the engine switch indicator light does not illuminate.
    2. If the voltage is too low, the indicator light will not illuminate.
    OK:
    Measurement Condition
    		Specified Condition
    Battery positive (+) → Terminal 11 (SWIL)
    Battery negative (-) → Terminal 4 (COM) or 5 (GND)
    		Illuminates
    Battery positive (+) → Terminal 12 (INDS)
    Battery negative (-) → Terminal 4 (COM) or 5 (GND)
    		Illuminates
    Battery positive (+) → Terminal 13 (INDW)
    Battery negative (-) → Terminal 4 (COM) or 5 (GND)
    		Illuminates


NG
REPLACE ENGINE SWITCH
OK


2.CHECK WIRE HARNESS (ENGINE SWITCH - POWER SOURCE CONTROL ECU AND BODY GROUND)
Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Starting.Starting System.Entry And Start System Engine Switch Indicator Circuit

  1. Disconnect the L29 switch connector.

  1. Disconnect the L73 ECU connector.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    L29-11 (SWIL) - L73-36 (SWIL)
    		Below 1 Ω
    L29-12 (INDS) - L73-4 (INDS)
    		Below 1 Ω
    L29-13 (INDW) - L73-13 (INDW)
    		Below 1 Ω
    L29-5 (GND) - Body ground
    		Below 1 Ω
    L29-4 (COM) - Body ground
    		Below 1 Ω
    L29-11 (SWIL) or L73-36 (SWIL) - Body ground
    		10 kΩ or higher
    L29-12 (INDS) or L73-4 (INDS) - Body ground
    		10 kΩ or higher
    L29-13 (INDW) or L73-13 (INDW) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE POWER SOURCE CONTROL ECU