Inspection Procedure

WARNING: This page is about a different car, the 2009 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

First, check if the headlight operation is normal before performing the following procedure.

CHECK HEADLIGHT BEAM LEVEL CONTROL ECU (HDLP VOLTAGE)

Measure the voltage of the connector.

Standard voltage

TESTER CONNECTION - SPECIFIED CONDITION

Tester Connection	Condition	Specified Condition
H12-10 (HDLP) - Body ground	Light control switch OFF	10 to 14 V
H12-10 (HDLP) - Body ground	Light control switch in HEAD	Below 1 V

Fig 1: Identifying Headlight Beam Level Control ECU Connector Terminals

NG : REPAIR OR REPLACE HARNESS AND CONNECTOR (HEADLIGHT BEAM LEVEL CONTROL ECU - H-LP RELAY)

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