Power Source Circuit [08/2013 - ]: Procedure

WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.

CHECK HARNESS AND CONNECTOR (POWER SOURCE VOLTAGE)

Disconnect the T12 lane departure warning camera connector.
Turn the power switch on (IG).

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Voltage

Tester Connection	Condition	Condition
T12-7 (IGB) - Body ground	Power switch on (IG)	11 to 14 V

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to Lane Departure Warning Camera)

Turn the power switch off.
Reconnect the T12 lane departure warning camera connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK HARNESS AND CONNECTOR (LANE DEPARTURE WARNING CAMERA - BODY GROUND)

Disconnect the T12 lane departure warning camera connector.

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

Standard Resistance

Tester Connection	Condition	Condition
T12-11 (GND) - Body ground	Always	Below 1 Ω

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to Lane Departure Warning Camera)

Reconnect the T12 lane departure warning camera connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → See step 3

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE [08/2013 - ]