Lighting System Afs Ecu Power Source Circuit

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK AFS ECU

CHECK WIRE HARNESS (AFS ECU - BODY GROUND)

LIGHTING SYSTEM - AFS ECU Power Source Circuit


DESCRIPTION

This circuit detects the state of the engine switch. The AFS ECU receives it from the engine switch.

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.Lighting.Lighting System.Lighting System Afs Ecu Power Source Circuit


INSPECTION PROCEDURE

1.CHECK AFS ECU
Lexus Gs430, Gs300. Uzs190 Grs190.Lighting.Lighting System.Lighting System Afs Ecu Power Source Circuit

  1. Measure the voltage of the connector.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    A31-1 - A31-2
    		Engine switch off
    		Below 1 V
    A31-1 - A31-2
    		Engine switch on (IG)
    		10 to 14 V


NG
Go to step 2
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

2.CHECK WIRE HARNESS (AFS ECU - BODY GROUND)
Lexus Gs430, Gs300. Uzs190 Grs190.Lighting.Lighting System.Lighting System Afs Ecu Power Source Circuit

  1. Disconnect the A31 AFS ECU connector.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A31-1 - Body ground
    		Always
    		Below 1 Ω


OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
NG

REPAIR OR REPLACE HARNESS AND CONNECTOR (AFS ECU - BODY GROUND)