Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus ES 350. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT DLC3 TERMINAL VOLTAGE

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

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Condition	Specified Condition
E21-4 (CG) - Body ground	Engine switch on (IG)	10 to 14 V
E21-4 (CG) - Body ground	Engine switch off	Below 1 V

Fig 1: Identifying DLC3 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

NG: Go to next step.

CHECK HARNESS AND CONNECTOR (DLC3 - HEADLIGHT BEAM LEVEL CONTROL ECU)

Disconnect the A22 AFS ECU connector.

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Condition	Specified Condition
A22-7 (INIT) - E21-8 (LVL)	Always	Below 1 Ω
A22-7 (INIT) - Body ground	Always	10 kΩ or higher

Fig 2: Identifying E21 And A22 Connectors Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step.

CHECK HARNESS AND CONNECTOR (DLC3 - BODY GROUND)

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Condition	Specified Condition
E21-4 (CG) - Body ground	Always	Below 1 Ω

Fig 3: Identifying E21 Connector Terminals

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE AFS ECU