Toyota Tundra Service Manual: Problem Symptoms Table

Toyota Tundra Service Manual / Vehicle Interior / Seat / Seat Heater System / Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

HINT:

Use the table below to help determine the cause of the problem symptom. 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.

Seat heater system

Symptom	Suspected Area	See page
Both seat heaters do not warm up	IG1 NO.5 relay	-
	IG1 NO.5 fuse	-
	Harness or connector	-
	Air conditioning amplifier assembly
Front seat cushion heater RH does not warm up	LIN communication system
	Harness or connector	-
	Front seat cushion heater RH
	Air conditioning control assembly (seat heater switch [for RH])
	Seat heater control sub-assembly RH
	Air conditioning amplifier assembly
Front seatback heater RH does not warm up	Harness or connector	-
	Front seat cushion heater RH
	Seat heater control sub-assembly RH
	Front seatback heater RH
Front seat cushion heater LH does not warm up	LIN communication system
	Harness or connector	-
	Front seat cushion heater LH
	Air conditioning control assembly (seat heater switch [for LH])
	Seat heater control sub-assembly LH
	Air conditioning amplifier assembly
Front seatback heater LH does not warm up	Harness or connector	-
	Front seat cushion heater LH
	Front seatback heater LH
	Seat heater control sub-assembly LH

Parts Location

System Description

See More:

Toyota Tundra Service Manual > Sfi System: ECM Power Source Circuit
DESCRIPTION When the ignition switch is turned to ON, the battery voltage is applied to the IGSW terminal of the ECM. The output signal from the MREL terminal of the ECM causes a current to flow to the coil, closing the contacts of the integration relay (EFI relay) and supplying power to terminals + ...

Toyota Tundra Service Manual: Problem Symptoms Table

Parts Location

System Description

See More:

Toyota Tundra Owners Manual

Toyota Tundra Service Manual