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.

PERFORM ACTIVE TEST USING INTELLIGENT TESTER

Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Turn the intelligent tester main switch on.

Select the item(s) below in the ACTIVE TEST, and check the operation.

MAIN BODY (MAIN BODY ECU):

DATA LIST

Tester Display	Test Part	Control Range	Diagnostic Note
LIGHTING IND	Engine switch illumination	ON / OFF	-

OK: Engine switch illumination comes on.

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

NG: Go to next step.

INSPECT ENGINE SWITCH

Remove the engine switch.

Fig 1: Identifying Engine Switch Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Apply battery voltage to the engine switch.

Check that the illumination comes on.

MEASUREMENT CONDITION

Measurement Condition	Specified Condition
Battery positive (+) → Terminal 11 (SWIL) Battery negative (-) → Terminal 5 (GND) or 4 (COM)	Engine switch illumination comes on

NG: REPLACE ENGINE SWITCH

OK: Go to next step.

CHECK HARNESS AND CONNECTOR (ENGINE SWITCH - MAIN BODY ECU AND BODY GROUND)

Disconnect the E61 main body ECU connector.
Disconnect the E68 engine switch connector.

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Condition	Specified Condition
E68-11 (SWIL) - E61-25 (SWIL)	Always	Below 1 Ω
E68-4 (COM) or E68-5 (GND) - Body ground	Always	Below 1 Ω
E68-11 (SWIL) - Body ground	Always	10 kΩ or higher

Fig 2: Identifying E68 And E61 Connectors Terminals

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY