Toyota Tundra Service 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.

Forward Recognition Camera System

Symptom	Suspected Area	Link
The message "Forward Camera System Unavailable Clean 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 "Forward Camera System 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	Power source circuit
	Forward recognition camera

Toyota Tundra Service Manual > Navigation System: Vehicle Speed Signal Circuit between Navigation Receiver Assembly and Combination Meter
DESCRIPTION The navigation receiver assembly receives a vehicle speed signal from the combination meter assembly to control the ASL function. HINT: A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter assembly. The signal is changed to a pulse signal at the transi ...

Toyota Tundra Owners Manual