Problem Symptoms Table

WARNING: This page is about a different car, the 2011 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Inspect the fuse and relay before confirming the suspected areas in the table below.

Inspect each suspected area in numerical order for the corresponding symptom.

If the malfunction still exists after checking and confirming that all circuits and components are normal, replace the ECU.

FRONT POWER SEAT CONTROL SYSTEM (W/ MEMORY)

Symptom	Suspected Area	See
Power seat does not operate (manual or memorized positions).	1. ECU power source circuit	Refer to ECU Power Source Circuit
	2. Position control ECU & switch assembly (front power seat switch)	Refer to DISASSEMBLY
One of the power seat functions does not operate (manual or memorized positions).	1. Power seat motor circuit	Refer to Power Seat Motor Circuit
	2. Position control ECU & switch assembly (front power seat switch)	Refer to DISASSEMBLY
One or all manual seat functions do not operate (memorized positions OK).	Position control ECU & switch assembly (front power seat switch)	Refer to DISASSEMBLY
Memory function does not operate.	1. Memory switch circuit	Refer to Driving Position Memory Switch Circuit (w/ Memory)
	2. Multiplex communication system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING
	3. Position control ECU & switch assembly (front power seat switch)	Refer to DISASSEMBLY
No memory functions operate or all memory functions operate briefly and then stop (manual functions OK).	1. ECU power source circuit	Refer to ECU Power Source Circuit
	2. Position control ECU & switch assembly (front power seat switch)	Refer to DISASSEMBLY
One memory function does not operate or operates briefly and then stops (manual functions OK).	1. Power seat motor assembly	Refer to Power Seat Motor Circuit
	2. Position control ECU & switch assembly (front power seat switch)	Refer to DISASSEMBLY