SYSTEM DIAGRAM The configuration of the electronic control system for the A760E automatic transmission is as shown in the following chart.
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Toyota Tundra Service Manual > Meter / Gauge System: Last Communication With Navigation ECU (U0163)
DESCRIPTION The combination meter assembly communicates with the navigation receiver assembly via the CAN line. DTC Code DTC Detection Condition Trouble Area U0163 When either of following conditions is detected: IG voltage 10.5 V or more No communication with navigation receiver assembly continues ...