DESCRIPTION The air conditioning control panel (radio and display receiver assembly) communicates with the air conditioning amplifier assembly via LIN communication. If a malfunction occurs in the LIN communication system, the air conditioning amplifier assembly will not operate, even if the air conditioning control panel (radio and display receiver assembly) is operated.
WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: Inspect the fuses for circuits related to this system before performing the following procedure. PROCEDURE
(a) Disconnect the G20 air conditioning control panel (radio and display receiver assembly) connector. (b) Measure the voltage and resistance according to the value(s) in the table below. Standard Voltage:
Standard Resistance:
(a) Disconnect the G35 air conditioning amplifier assembly connector. (b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
(a) Connect the G35 air conditioning amplifier assembly connector. (b) Turn the engine switch on (IG). (c) Using an oscilloscope, check the waveform.
OK: Waveform is similar to that shown in the illustration.
(a) Connect the G20 air conditioning control panel (radio and display receiver assembly) connector. (b) Turn the engine switch on (IG). (c) Using an oscilloscope, check the waveform.
OK: Waveform is similar to that shown in the illustration.
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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Active Noise Control System: UART Communication Between ANC and Audio Amplifier Missing Message (B1AA187)
DESCRIPTION This DTC is stored when an UART communication error occurs between the stereo component equalizer assembly and stereo component amplifier assembly. DTC No. Detection Item DTC Detection Condition Trouble Area B1AA187 UART Communication Between ANC and Audio Amplifier Missing Message Stere ...