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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 driver side junction block fuse box opening cover. Remove the ECU-IG fuse from the driver side junction block. Check the continuity of the ECU-IG fuse. 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 ECU-IG fuse.
  2. Disconnect the theft deterrent ECU connectors. Turn the ignition switch ON. Measure the voltage between terminal T5-10 (IG) of the theft deterrent ECU connector and body ground. If there is voltage 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 battery.
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