Problem Symptoms Table

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/o MEMORY)

Symptom	Suspected area
Power seat does not operate (slide, front vertical, lifter, reclining).	1. P/SEAT fuse
	2. POWER SEAT SWITCH
	3. Wire harness or connector
Slide operation function only does not operate.	1. POWER SEAT SWITCH
	2. FRONT SEAT FRAME WITH ADJUSTER (LH SIDE SLIDE MOTOR)
	3. FRONT SEAT FRAME WITH ADJUSTER (RH SIDE SLIDE MOTOR)
	4. Wire harness or connector
Front vertical operation function only does not operate.	1. POWER SEAT SWITCH
	2. FRONT SEAT FRAME WITH ADJUSTER (LH SIDE FRONT VERTICAL MOTOR)
	3. FRONT SEAT FRAME WITH ADJUSTER (RH SIDE FRONT VERTICAL MOTOR)
	4. Wire harness or connector
Lifter operation function only does not operate.	1. POWER SEAT SWITCH
	2. FRONT SEAT FRAME WITH ADJUSTER (LH SIDE LIFTER MOTOR)
	3. FRONT SEAT FRAME WITH ADJUSTER (RH SIDE LIFTER MOTOR)
	4. Wire harness or connector
Reclining operation function only does not operate.	1. POWER SEAT SWITCH
	2. FRONT SEAT FRAME WITH ADJUSTER (LH SIDE RECLINING MOTOR)
	3. FRONT SEAT FRAME WITH ADJUSTER (RH SIDE RECLINING MOTOR)
	4. Wire harness or connector
Lumbar support operation function only does not operate (Driver side only).	1. FRONT POWER SEAT LUMBAR SWITCH
	2. LUMBAR SUPPORT ADJUSTER ASSEMBLY
	3. Wire harness or connector

FRONT POWER SEAT CONTROL SYSTEM (w/ MEMORY)

FRONT POWER SEAT CONTROL SYSTEM (W/ MEMORY)

Symptom	Suspected area	See
Power seat does not operate (manual or memorized position).	1. ECU POWER SOURCE CIRCUIT
Power seat does not operate (manual or memorized position).	2. Position control ECU and switch assembly (power seat control switch and ECU)	DISASSEMBLY
One of the power seat functions does not operate (manual or memorized position).	1. POWER SEAT MOTOR CIRCUIT
	2. Position control ECU and switch assembly (power seat control switch and ECU)	DISASSEMBLY
One or all manual seat functions do not operate (memorized positions OK).	1. Position control ECU and switch assembly (power seat control switch and ECU)	DISASSEMBLY
Memory function does not operate.	1. MEMORY SWITCH CIRCUIT
	2. Multiplex communication system	HOW TO PROCEED WITH TROUBLESHOOTING
	3. Position control ECU and switch assembly (power seat control switch and ECU)	DISASSEMBLY
No memory functions operate or all memory functions operate briefly and then stop (manual functions OK).	1. ECU POWER SOURCE CIRCUIT
	2. Position control ECU and switch assembly (power seat control switch and ECU)	DISASSEMBLY
One memory function does not operate or operates briefly and then stops (manual functions OK).	1. FRONT SEAT FRAME WITH ADJUSTER (POWER SEAT MOTOR)
	2. Position control ECU and switch assembly (power seat control switch and ECU)	DISASSEMBLY