DESCRIPTION This circuit detects the ignition switch ON or off condition, and sends it to the main body ECU (multiplex network body ECU). WIRING DIAGRAM 
CAUTION / NOTICE / HINT NOTICE: Inspect the fuses for circuits related to this system before performing the following procedure. PROCEDURE
(a) Read the Data List according to the display on the Techstream. Click here
OK: Normal conditions listed above are displayed.
(a) Disconnect the driver side junction block assembly connectors. 
(b) Measure the voltage according to the value(s) in the table below. Standard Voltage:
(c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
(a) Remove the driver side junction block assembly. Click here 
(b) Remove the main body ECU (multiplex network body ECU) from the driver side junction block assembly. Click here (c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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Toyota Tundra Service Manual > Engine Immobiliser System (w/o Smart Key System): Registration
REGISTRATION PROCEDURE 1. NOTICES WHEN REGISTRATION PROCEDURE NOTICE: Make sure to check the items listed below before proceeding with troubleshooting. Do not perform "Immobiliser Code Reset" (all key ID erasure) until all of the malfunctions and symptoms have been confirmed and resolved. ...
