Indicator 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 HEADLIGHT LEVELING ECU ASSEMBLY (INPUT SIGNAL)

Disconnect the A29 headlight leveling ECU assembly connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard Voltage

Tester Connection	Condition	Specified Condition
A29-6 (WNG) - Body ground	Power switch on (IG)	11 to 14 V
A29-6 (WNG) - Body ground	Power switch off	Below 1 V

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to Headlight Leveling ECU Assembly)

NG → See step 2

OK → See step 3

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - HEADLIGHT LEVELING ECU ASSEMBLY)

Disconnect the H14 combination meter assembly connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
A29-6 (WNG) - H14-3 (LVWG)	Always	Below 1 Ω
A29-6 (WNG) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → See step 4

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE [08/2013 - ]
GO TO METER / GAUGE SYSTEM. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2013 - ]