2020 Toyota Sienna Electrical Parts

This table covers the alternators that charge the battery and run the electrical load. Typical signs include dim lights at idle, a battery lamp, or a growl from the charging pulley. Load-test the battery and inspect the belt and grounds — a bad ground mimics a failed alternator. Read more

6 Alternator / Generator parts for the 2020 Toyota Sienna come from 6 brands — TYC, PURE ENERGY, BOSCH and 3 other brands. The "Popular" part is TYC 221248.

The New section lists 1 option from TYC — brand-new units rather than rebuilt ones. TYC 221248 is listed in this group.

The Remanufactured section lists 5 options from PURE ENERGY, BOSCH, FVP and 2 other brands — factory-rebuilt units with new wear components. PURE ENERGY 11889 is listed in this group.

Listed part numbers: TYC 221248, PURE ENERGY 11889 and BOSCH AL3403X, plus the other parts above.

This table covers the rectifier diode packs in the alternator. Read more

This group shows a single part: BOSCH 1986AE0621.

This table covers the bearings in the alternator housing. Typical signs include a growl that rises with speed, or play in the shaft or hub. Set preload the way the notes specify. A dry or crushed bearing fails quickly. Read more

One part is listed for the 2020 Toyota Sienna — BOSCH 1986AE0628.

This table covers the pulleys on the alternator shaft. Typical signs include a growl or chirp that follows engine speed, or a pulley that will not spin freely by hand. Spin each pulley with the belt off. Roughness or play means replace it with the belt. Read more

3 Alternator / Generator Pulley parts are listed for the 2020 Toyota Sienna, from CONTINENTAL, DORMAN and LITENS.

Listed part numbers: CONTINENTAL 49972, DORMAN 300432 and LITENS 920068A.

This table covers the Automatic Headlamp sensors. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors. Read more

One part is listed for the 2020 Toyota Sienna — AUTOTECNICA TY1321507.

This table covers the batteries listed by group size and specification. Typical signs include slow cranking, a battery lamp, or a no-start after the vehicle sat overnight. Confirm group size and terminal layout in the notes. Clean the posts and the ground before condemning the battery. Read more

7 Battery parts are listed for the 2020 Toyota Sienna, from DEKA, BOSCH, EXIDE and 2 other brands. DEKA 9A3585 carries the "Popular" badge.

Part numbers include DEKA 9A3585, DEKA 9A34R and BOSCH S6523B, among others listed above.

This table covers the clamps and brackets that secure the battery. Read more

2 Battery Hold Down parts for the 2020 Toyota Sienna come from 2 brands — SKP and VARIOUS MFR.

This group includes SKP SK7440403K and VARIOUS MFR TO2996101.

This table covers the terminals and clamps that connect cables to the battery posts. Read more

5 Battery Terminal parts are listed for the 2020 Toyota Sienna, from BECK/ARNLEY, STANDARD MOTOR PRODUCTS, AUTOTECNICA and 1 other brand. STANDARD MOTOR PRODUCTS BP100P carries the "Popular" badge.

Listed part numbers: STANDARD MOTOR PRODUCTS BP100P, AUTOTECNICA TY1318200 and BECK/ARNLEY 2060001, plus the other parts above.

This table covers the replacement fuses for this vehicle's fuse boxes. Typical signs include one circuit dead while its neighbor still works, or a fuse that blows again as soon as you replace it. Match amperage and fuse type. A repeat blow means a short — find it before the next fuse. Read more

One part is listed for the 2020 Toyota Sienna — BUSSMANN MPF2534X.

This table covers the horns mounted in the front of the vehicle. Read more

FIAMM supplies the 7 Horn parts for the 2020 Toyota Sienna. FIAMM 72112 carries the "Popular" badge.

In the Accessory Replacement grade, FIAMM supplies 5 parts: grouped under the catalog's "Accessory Replacement" designation — the notes column spells out what sets them apart. A representative part number is FIAMM 72112.

The Standard Replacement section lists 2 options from FIAMM — built to original-equipment specification. FIAMM 7421122 is listed in this group.

Part numbers include FIAMM 72112, FIAMM 7410024 and FIAMM 6602023, among others listed above.

This table covers the key fobs that lock, unlock and start the vehicle. Read more

2 Keyless Entry Remote parts for the 2020 Toyota Sienna come from DORMAN.

This group includes DORMAN 99136 and DORMAN 99143.

This table covers the ultrasonic park-aid sensors in the bumper. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors. Read more

This group shows a single part: TECHPRO TO1075109.

This table covers the starter motors that crank the engine. Typical signs include no motion, a squeal, or a motor that only runs on one speed. Confirm power, ground and the control module before replacing the motor. Read more

8 Starter Motor parts for the 2020 Toyota Sienna come from 8 brands — TYC, ULTRA-POWER, WAI GLOBAL and 5 other brands. The "Popular" part is TYC 116366.

The New section: 3 options from TYC, ULTRA-POWER and WAI GLOBAL. TYC 116366 is listed in this group.

The Remanufactured section: 5 options from BOSCH, DENSO, PURE ENERGY and 2 other brands. BOSCH SR3319X is listed in this group.

Listed part numbers: TYC 116366 and ULTRA-POWER 16366N, plus the other parts above.

This table covers the Starter solenoids. Typical signs include a harsh or missing shift, or a code for this solenoid circuit. Check resistance and the connector before dropping the pan for a solenoid. Read more

This group shows a single part: WELLS 1M1617.