Toyota Sienna Service Manual: Problem symptoms table

Toyota Sienna Service Manual / Seat / Rear no. 2 Seat assembly (w/ Power Stowing Function) / 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 "Suspect 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 fuse and relays related to the system before inspecting the suspected areas below.

POWER REAR NO. 2 SEAT with STOWING FUNCTION

Symptom	Symptom Suspected area
No functions operate.	Power source circuit Fold seat control ECU
The folding-down function does not operate.	Park/Neutral position switch circuit Back door courtesy switch circuit Lock switch circuit Reclining motor circuit Fold seat switch circuit Folding motor circuit Folding motor Fold seat control ECU
The return function does not operate.	Park/Neutral position switch circuit Back door courtesy switch circuit Reclining motor circuit Folding motor circuit Fold seat switch circuit Release actuator circuit Folding motor Release actuator Fold seat control ECU
The stowing function does not operate.	Park/Neutral position switch circuit Back door courtesy switch circuit Reclining motor circuit Folding motor circuit Fold seat switch circuit Fold lock switch circuit Folding motor Fold seat control ECU
The reclining function does not operate.	Lock switch circuit Reclining motor circuit Rear power seat switch circuit Fold seat control ECU
The indicator does not come on or blink.	Indicator circuit Fold seat control ECU

Initialization

HINT: The seatback position is initialized at the factory before shipment, so initialization is not normally required. There is an initialization function for cases when reinitializati ...

Terminals of ECU

1. FOLD SEAT CONTROL ECU LH Disconnect the fold seat control ECU connectors. Measure the voltage and resistance of the wire harness side connectors. If the result is not as specifie ...

Other materials:

Positioning a floor jack
When using a floor jack, follow the instructions in the manual provided with the jack and perform the operation safely. When raising your vehicle with a floor jack, position the jack correctly. Improper placement may damage your vehicle or cause injury. Front Rear 2WD ...

Removal
1. DRAIN BRAKE FLUID NOTICE: Wash brake fluid off immediately if it adheres to any painted surface. 2. DISCONNECT BATTERY NEGATIVE TERMINAL 3. REMOVE AIR CLEANER ASSEMBLY WITH HOSE 4. REMOVE BRAKE ACTUATOR WITH BRACKET (a) Release the latch of the brake actuator connector to disconnect t ...

Removal
1. REMOVE REAR DOOR SCUFF PLATE 2. REMOVE REAR DOOR WEATHERSTRIP 3. REMOVE BACK DOOR WEATHERSTRIP 4. REMOVE BACK DOOR SCUFF PLATE 5. REMOVE FRONT QUARTER TRIM PANEL ASSEMBLY Remove the floor anchor cover. Remove the bolt and disconnect the No. 2 rear seat outer belt assem ...