Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

NOTICE:

If the auxiliary battery voltage becomes low, auxiliary battery load control will operate in order to ensure sufficient power is supplied to the power steering system. In this case, the seat heater system (for HV model) may not operate.

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.

Seat Heater System

Symptom	Suspected Area	Link
Front seat heater does not operate for driver side and front passenger side seat	Seat heater switch (radio and display receiver assembly)	-
	Air conditioning amplifier assembly	-
	S/HTR F/R relay	-
	Wire harness or connector	-
Seat heater for front right seat does not operate	Refer to the "Seat Heater for Front Right Seat does not Operate".
Seat heater for front left seat does not operate	Refer to the "Seat Heater for Front Left Seat does not Operate".
Seat heater for rear left and rear right seat do not operate	Air conditioning amplifier assembly	-
Seat heater for rear right seat does not operate	Seat heater assembly (rear seat cushion heater RH)
	Seat heater assembly (rear seatback heater RH)
	Seat heater switch (RH)
	S/HTR R/R relay	-
	Wire harness or connector	-
	Air conditioning amplifier assembly	-
Seat heater for rear left seat does not operate	Seat heater assembly (rear seat cushion heater LH)
	Seat heater assembly (rear seatback heater LH)
	Seat heater switch (LH)
	S/HTR R/L relay	-
	Wire harness or connector	-
	Air conditioning amplifier assembly	-

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Sfi System: HO2S Heater Control Bank 1 Sensor 1 Circuit Short to Battery (P003012,P003013,P101A9E)
DESCRIPTION The air fuel ratio sensor (sensor 1) generates current that corresponds to the actual air fuel ratio. This sensor current is used to provide the ECM with feedback so that it can control the air fuel ratio. The ECM determines the deviation from the stoichiometric air fuel ratio level, and ...

Toyota Avalon (XX50) 2019-2022 Owners Manual