DIAGNOSIS SYSTEM CHECK DLC3 (a) Check the DLC3. Click here CHECK WARNING LIGHT (a) When a problem occurs in the power steering system, the EPS warning light in the combination meter assembly comes on to inform the driver of the problem. 
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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Audio And Visual System(for Gasoline Model): Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART Audio and Visual System DTC No. Detection Item Link B1324 Lost Communication with Meter B1551 HD Radio Tuner Malfunction B1579 Voice Recognition Microphone Disconnected B1585 USB Device Malfunction B158D Video Signal Stoppage B158F AV Signal Stoppage (Low Battery Voltag ...
