Inspection Procedure

WARNING: This page is about a different car, the 2002 Toyota MR2. However, it is still accessible from the selected car via links, so may be relevant.

Check security indicator light.
PREPARATION:

Remove heater control assembly (A/C SW). See REMOVAL .

CHECK:

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

Fig 1: Applying Voltage To Security Indicator Light Circuit
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK = Security indicator light comes on.
1. OK: Go to next step.
2. NG: Replace heater control assembly.
Check harness and connector between ECM and security indicator light, and security indicator light and body ground.
1. OK: Check and replace ECM.
  NOTE: When there is a malfunction that the engine immobilizer system cannot be set, proceed to the next numbered circuit inspection shown in PROBLEM SYMPTOMS .
2. NG: Repair or replace harness or connector.