Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT IGNITION RELAY NO. 1

Inspect IG1 relay continuity.

Remove the IG1 relay from the instrument panel J/B.

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

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
3 - 5	10 kΩ or higher
3 - 5	Below 1 Ω (When battery voltage is applied to terminal 1 - 2)

Fig 1: Identifying Ignition Relay Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE IGNITION RELAY NO. 1

OK: Go to next step

INSPECT HEADLIGHT BEAM LEVEL CONTROL ECU

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

Standard voltage

VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Condition
A21-14 - A21-1	Ignition switch off → Ignition switch on (IG)	Below 1 V → 10 to 14 V

NG: Go to step 3

Fig 2: Identifying Headlight Beam Level Control ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

CHECK HARNESS AND CONNECTOR (BATTERY - HEADLIGHT BEAM LEVEL CONTROL ECU)

Disconnect connector A21 of the headlight beam level control ECU.

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

Standard voltage

VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Condition
A21-14 - Body ground	Ignition switch off → Ignition switch on (IG)	Below 1 V → 10 to 14 V

Fig 3: Disconnecting Headlight Beam Level Control ECU Connector

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR