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:

Comfort Access
Concept The vehicle can be accessed without operating the vehicle key. Carrying the vehicle key with you, e.g., in your pants pocket, is sufficient. The vehicle automatically detects the vehicle key when it is in close proximity or in the car's interior. General information Comfort Access supports ...

Wireless remote control/ electronic key battery
Replace the battery with a new one if it is depleted. You will need the following items: Flathead screwdriver Lithium battery CR2032 Replacing the battery Vehicles without a smart key system Remove the cover using a coin protected with tape etc. Remove the deplete ...

Customize parameters
HINT: The following items can be customized. NOTICE: After confirming whether the items requested by the customer are applicable or not for customization, perform the customize operation. Be sure to record the current settings before customizing. When troubleshooting, make sure that ...