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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 475 (LEXUS Link System - Diagnosis) >> Circuit Inspection >> DTC 4 "CODE 4. Telephone ECU failure" >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

This DTC is output when there is a failure in the telephone ECU (Mayday ECU). In this case, replace the telephone ECU (Mayday ECU).

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