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:

Check if the combination meter operation is normal before performing the following procedure.

CHECK HEADLIGHT BEAM LEVEL CONTROL ECU

Disconnect the H12 ECU connector.

Fig 1: Checking Headlight Beam Level Control ECU

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Measure the voltage of the wire harness side connector.

Standard voltage

TESTER CONNECTION - SPECIFIED CONDITION

Tester Connection	Condition	Specified Condition
H12-11 (WNG) - Body ground	Power switch ON (IG)	10 to 14 V

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

NG : GO TO NEXT STEP

CHECK WIRE HARNESS (ECU - METER)

Disconnect the H12 ECU connector.
Disconnect the C10 meter connector.

Fig 2: Checking Wire Harness (ECU - Meter)

Measure the resistance of the wire harness side connectors.

Standard resistance

TESTER CONNECTION - SPECIFIED CONDITION

Tester Connection	Specified Condition
H12-11 (WNG) - C10-10	Below 1Ω
H12-11 (WNG) - Body ground	10 kΩ or higher

NG : REPAIR OR REPLACE HARNESS AND CONNECTOR

OK : REPLACE COMBINATION METER