Entry And Start System Engine Switch Indicator Circuit

Engine. Lexus Is250, Is220D. Gse20 Ale20
4Gr-Fse Starting. Lexus Is250, Is220D. Gse20 Ale20

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 (A/T)
Clutch pedal released (M/T)
Brake pedal depressed, shift lever in P or N (A/T)
Clutch pedal depressed (M/T)
off
OFF
Illuminates ON (Green)
Illuminates ON (Green)
on (ACC, IG)
Illuminates ON (Amber)
Illuminates ON (Green)
Illuminates ON (Green)
Engine running
OFF
OFF
OFF
Steering lock not unlocked
Flashes (Green) for 30 sec.
Flashes (Green) for 30 sec.
Flashes (Green) for 30 sec.
System malfunction
Flashes (Amber) for 15 sec.
Flashes (Amber) for 15 sec.
Flashes (Amber) for 15 sec.
Clutch start switch malfunction (M/T)
Flashes (Green) for 15 sec.
Flashes (Green) for 15 sec.
Flashes (Green) for 15 sec.

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System.Entry And Start System Engine Switch Indicator Circuit


INSPECTION PROCEDURE

1.INSPECT ENGINE SWITCH


  1. Remove the engine switch.


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System.Entry And Start System Engine Switch Indicator Circuit

  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 does not illuminate.
    2. If the voltage is too low, the indicator 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 Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System.Entry And Start System Engine Switch Indicator Circuit

  1. Disconnect the J31 switch connector.

  1. Disconnect the J55 ECU connector.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    J31-11 (SWIL) - J55-36 (SWIL)
    		Always
    		Below 1 Ω
    J31-12 (INDS) - J55-4 (INDS)
    		Always
    		Below 1 Ω
    J31-13 (INDW) - J55-13 (INDW)
    		Always
    		Below 1 Ω
    J31-5 (GND) - Body ground
    		Always
    		Below 1 Ω
    J31-4 (COM) - Body ground
    		Always
    		Below 1 Ω
    J31-11 (SWIL) or J55-36 (SWIL) - Body ground
    		Always
    		10 kΩ or higher
    J31-12 (INDS) or J55-4 (INDS) - Body ground
    		Always
    		10 kΩ or higher
    J31-13 (INDW) or J55-13 (INDW) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE POWER SOURCE CONTROL ECU