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.

1. FRONT POWER SEAT CONTROL SYSTEM (w/o MEMORY) 
   PROBLEM SYMPTOMS CHART
   
   

   Symptom	Suspected Area	See
   Power seat does not operate (slide, front vertical, lifter, reclining).	1.P/SEAT fuse	-
   	2. Power seat switch	POWER SEAT SWITCH
   	3. Wire harness or connector	-
   Slide operation function only does not operate.	1. Power seat switch	POWER SEAT SWITCH
   	2. Front seat frame with adjuster (LH side slide motor)	FRONT SEAT FRAME WITH ADJUSTER
   	3. Front seat frame with adjuster (RH side slide motor)	FRONT POWER SEAT LUMBAR SWITCH
   	4. Wire harness or connector	-
   Front vertical operation function only does not operate.	1. Power seat switch	POWER SEAT SWITCH
   	2. Front seat frame with adjuster (LH side front vertical motor)	FRONT SEAT FRAME WITH ADJUSTER
   	3. Front seat frame with adjuster (RH side front vertical motor)	FRONT POWER SEAT LUMBAR SWITCH
   	4. Wire harness or connector	-
   Lifter operation function only does not operate.	1. Power seat switch	POWER SEAT SWITCH
   	2. Front seat frame with adjuster (LH side lifter motor)	FRONT SEAT FRAME WITH ADJUSTER
   	3. Front seat frame with adjuster (RH side lifter motor)	FRONT POWER SEAT LUMBAR SWITCH
   	4. Wire harness or connector	-
   Reclining operation function only does not operate.	1. Power seat switch	POWER SEAT SWITCH
   	2. Front seat frame with adjuster (LH side reclining motor)	FRONT SEAT FRAME WITH ADJUSTER
   	3. Front seat frame with adjuster (RH side reclining motor)	FRONT POWER SEAT LUMBAR SWITCH
   	4. Wire harness or connector	-
   Lumbar support operation function only does not operate.	1. Front power seat lumbar switch	FRONT POWER SEAT LUMBAR SWITCH
   	2. Lumbar support adjuster assembly	LUMBAR SUPPORT ADJUSTER ASSEMBLY
   	3. Wire harness or connector	-

2. FRONT POWER SEAT CONTROL SYSTEM (w/ MEMORY) 
   PROBLEM SYMPTOMS CHART
   
   

   Symptom	Suspected Area	See
   Power seat does not operate (manual or memorized position).	1. ECU power source circuit	ECU POWER SOURCE CIRCUIT
   	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	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	DRIVING POSITION MEMORY SWITCH CIRCUIT (W/ MEMORY)
   	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	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)	FRONT SEAT FRAME WITH ADJUSTER
   	2. Position control ECU and switch assembly (power seat control switch and ECU)	DISASSEMBLY