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Home >> Toyota >> 2004 >> Matrix Base, FWD, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 224 (Anti-Theft System) >> Circuit Tests >> Horn Relay Circuit >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2003 Lexus IS 300 and 2002 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: The inspection procedure is based on the premise that the horns blow normally whenever the horn switch is operated. If horn operation is not normal when the horn switch is operated, check the horn switch. See STEERING COLUMN SWITCHES article in ACCESSORIES & EQUIPMENT.

Disconnect the theft deterrent ECU connectors. Measure the voltage between terminal T6-4 (HORN) of the theft deterrent ECU connector and body ground. See CONNECTOR IDENTIFICATION . If voltage is between 10-14 volts, check and replace the theft deterrent ECU. If the voltage is not as specified, check and repair the harness and connector between the theft deterrent ECU and horn relay.

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