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Home >> Toyota >> 2004 >> Matrix Base, FWD, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 224 (Anti-Theft System) >> Circuit Tests >> Ecu Power Source Circuit >> Inspection Procedure
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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.
  1. Remove the MPX-B located in the passenger side junction block and the ECU-B1 fuse located in the engine room No. 1 relay block. Check the continuity of MPX-B and ECU-B1 fuses. If there is continuity, go to the next step. If there is not continuity, check for a short in all the harnesses and components connected to the MPX-B and ECU-B1 fuses.
  2. Disconnect the theft deterrent ECU connector. Measure the voltage between terminals T6-1 (+B2) and T5-22 (E) of the theft deterrent ECU connector. See CONNECTOR IDENTIFICATION . If voltage is between 10-14 volts, proceed to the next circuit inspection of the symptom. See PROBLEM SYMPTOM INDEX  table. If voltage is not as specified, go to the next step.
  3. Check for an open in the harness and connector between the ECU and body ground. If the results are OK, check and repair the harness and connector between the ECU and battery. If the results are not good, repair or replace the harness or connector.
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