Inspection Procedure

Check horn.
PREPARATION:

Connect the battery's positive (+) lead to terminal 1 and negative (-) lead to terminal 2 of the horn connector.

Fig 1: Connecting Battery Leads To Horn Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK:

Horn blows.
1. NG : Replace horn.
2. OK : Go to next step.
Check for harness and connector between horn relay and passenger side J/B ECU, and battery and horn relay (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
1. NG : Repair or replace harness and connector.
2. OK : Proceed to next circuit inspection shown in problem symptoms table (See PROBLEM SYMPTOMS TABLE ).