Entry And Start System Power Source Mode Does Not Change

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

DESCRIPTION

INSPECTION PROCEDURE

CHECK FOR DTC

CHECK BASIC FUNCTION

ENTRY AND START SYSTEM - Power Source Mode does not Change


DESCRIPTION

If the certification ECU detects the key inside the vehicle when the shift lever position is P and the brake pedal is not depressed, each press of the engine switch changes the power source mode in the following order: off, on (ACC), on (IG), off. If one of the DTCs shown in the following illustration is detected, correct the DTCs according to the DTC chart. If the power source mode is still malfunctioning, one of the following may have occurred: 1) the MPX circuit has a malfunction, 2) the certification ECU has determined that the key is not inside the vehicle, 3) the engine switch has a malfunction, or 4) the power source control ECU has a malfunction.

Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Starting.Starting System.Entry And Start System Power Source Mode Does Not Change


INSPECTION PROCEDURE

1.CHECK FOR DTC

  1. Delete the DTCs.

    HINT:
    After all DTCs are cleared, check if the trouble occurs again 5 seconds after the engine switch is turned on (IG).

  1. Check for DTCs again.

    OK:
    No DTC is output.


NG
GO TO DTC CHART
OK


2.CHECK BASIC FUNCTION

  1. When the key is inside the vehicle and the shift lever position is in P, check that depressing the brake pedal causes the engine switch indicator to illuminate green.

    Result:
    Result
    		Proceed to
    Indicator illuminates green
    		A
    Engine switch indicator circuit is normal but indicator does not illuminate green
    		B
    Room oscillator recognizes key but indicator does not illuminate green
    		C


B
GO TO ROOM OSCILLATOR DOES NOT RECOGNIZE KEY

C
GO TO ENGINE SWITCH INDICATOR CIRCUIT
A

REPLACE POWER SOURCE CONTROL ECU