Toyota Avalon Service & Repair Manual: Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

HINT:

Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
Inspect the fuses and relays related to this system before inspecting the suspected areas below.

Front Camera System

Symptom	Suspected Area	Link
The message "Front Camera Unavailable Remove Debris On Windshield" is frequently displayed	Non-Toyota genuine front wiper blades are installed	-
	The front wiper rubbers are worn	-
	A sticker, accessory or other object is obstructing the forward recognition camera	-
	There is snow, frost, dirt, dust or oil on the windshield glass, or the windshield glass is fogged up	-
	A glass coating has been applied to the windshield glass	-
	The windshield glass is chipped or cracked	-
	Non-Toyota genuine windshield glass is installed	-
	Forward recognition camera
The message "Front Camera Unavailable" is frequently displayed	Immediately after the engine is started	-
	The cabin temperature is extremely high	-
	The cabin temperature is extremely low	-
	Forward recognition camera
A system that uses the forward recognition camera does not operate	Forward recognition camera

Toyota Avalon Service & Repair Manual > Smart Key System(for Start Function, Gasoline Model): Short to GND in Immobiliser System Power Source Circuit (B278A)
DESCRIPTION When there is a short to GND in the power supply for the transponder key amplifier of the engine switch, the certification ECU (smart key ECU assembly) stores this DTC. DTC No. Detection Item DTC Detection Condition Trouble Area Note B278A Short to GND in Immobiliser System Power Source ...

Toyota Avalon Owners Manual