Inspection Procedure

Check security indicator light.
PREPARATION:

Remove heater control assembly (A/C SW) (See ON-VEHICLE INSPECTION )

CHECK:

Connect the positive (+) lead to terminal 6 and the negative (-) lead to terminal 4 of heater control connector

Fig 1: Connecting Positive Lead To Terminal 6 And Negative Lead To Terminal 4
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK:

Security indicator light comes on.

NG: Replace heater control assembly.

OK: Go to next step.
Check harness and connector between ECM and security indicator light, and security indicator light and body ground (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
NG: Repair or replace harness or connector.

OK: Check and replace ECM* ¹ .

*¹ : When there is a malfunction that the engine immobilizer system cannot be set, proceed to the next numbered circuit inspection shown in problem symptoms table (See PROBLEM SYMPTOMS TABLE ).