DESCRIPTION The main body ECU (multiplex network body ECU) controls the operation of the TAIL relay. WIRING DIAGRAM ![]() CAUTION / NOTICE / HINT NOTICE:
PROCEDURE
(a) Connect the Techstream to the DLC3. (b) Turn the power switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Main Body / Active Test. (e) Perform the Active Test according to the display on the Techstream. Body Electrical > Main Body > Active Test
OK: Taillights illuminate.
(a) Disconnect the 4K instrument panel junction block assembly connector. (b) Measure the voltage according to the value(s) in the table below. Standard Voltage:
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(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly. Click here (b) Connect a positive (+) lead from the auxiliary battery to terminal 4K-1. (c) Connect a negative (-) lead from the auxiliary battery to terminal MB-14 (TRLY). (d) Measure the voltage according to the value(s) in the table below. Standard Voltage:
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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Telematics System(for Gasoline Model): Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART Telematics System DTC No. Detection Item Link U0142 Lost Communication with Body Control Module "B" U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module U0163 Lost Communication with Navigation Control Module ...