16 Electrical connector parts are listed for the 2021 Toyota Sienna, in 14 part types, covering the 2.5L L4 ELECTRIC/GAS engine. Each one has a brand, a manufacturer part number and notes that say where it fits.
The connector system on the 2021 Toyota Sienna supplies the pigtails and connector bodies that terminate the vehicle harness at lamps, sensors and modules. The largest groups are Trailer Connector (3 parts), Accelerator Pedal Position Sensor Connector (1 part) and Blower Motor Connector (1 part). The other 11 part types cover the remaining 11 parts.
Every part on this page is matched to the 2.5L L4 ELECTRIC/GAS — the only engine offered in the 2021 Toyota Sienna.
The most listed brands for 2021 Toyota Sienna electrical connector parts are STANDARD MOTOR PRODUCTS (11 parts), CURT (2 parts) and GPD (1 part), plus 2 more brands.
Each part number listed for the 2021 Toyota Sienna opens a page with every vehicle that part fits.
Accelerator Pedal Position Sensor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | S2815 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
This table covers the harness connectors at the Accelerator Pedal Position Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
One part is listed for the 2021 Toyota Sienna — STANDARD MOTOR PRODUCTS S2815.
Blower Motor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | S3208 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Frontwith 3 Blade Terminals | View on Amazon |
This table covers the harness connectors at the Blower Motor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
One part is listed for the 2021 Toyota Sienna — STANDARD MOTOR PRODUCTS S3208.
HVAC Control Switch / Panel Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GPD | 1713413 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
This table covers the harness connectors at the HVAC Control Switch / Panel. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
One part is listed for the 2021 Toyota Sienna — GPD 1713413.
Ignition Coil Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | S2438 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
This table covers the harness connectors at the Ignition Coil. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
One part is listed for the 2021 Toyota Sienna — STANDARD MOTOR PRODUCTS S2438.
Knock / Detonation Sensor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | S2328 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Connector Shape: Rectangular, OvalTerminal Quantity: 2 | View on Amazon |
This table covers the harness connectors at the Knock / Detonation Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
One part is listed for the 2021 Toyota Sienna — STANDARD MOTOR PRODUCTS S2328.
Mass Air Flow (MAF) Sensor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | S3313 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
This table covers the harness connectors at the Mass Air Flow (MAF) Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
This group shows a single part: STANDARD MOTOR PRODUCTS S3313.
Parking Aid Sensor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | S3297 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
This table covers the harness connectors at the Parking Aid Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
One part is listed for the 2021 Toyota Sienna — STANDARD MOTOR PRODUCTS S3297.
Radio Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| METRA | AXSWCHT28 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Plug And Play Harness | View on Amazon |
This table covers the harness connectors at the Radio. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
This group shows a single part: METRA AXSWCHT28.
Temperature Sender / Sensor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | S3203 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
This table covers the harness connectors at the Temperature Sender / Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
One part is listed for the 2021 Toyota Sienna — STANDARD MOTOR PRODUCTS S3203.
Trailer Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CURT | 56458 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Custom Wiring Harness4-Way Flat Output | View on Amazon |
| CURT | 56489 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Custom Wiring Harness4-Way Flat Output | View on Amazon |
| TEKONSHA | 118824 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | T-One Connector Assembly | View on Amazon |
This table covers the trailer-lighting connectors at the hitch. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
3 Trailer Connector parts for the 2021 Toyota Sienna come from 2 brands — CURT and TEKONSHA.
This group includes CURT 56458, CURT 56489 and TEKONSHA 118824.
Vapor Canister Purge Valve / Solenoid Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | S1530 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Connector Shape: OvalHarness Length | View on Amazon |
This table covers the harness connectors at the Vapor Canister Purge Valve / Solenoid. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
One part is listed for the 2021 Toyota Sienna — STANDARD MOTOR PRODUCTS S1530.
Vapor Leak Detection Pump Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | S2818 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Gauge: 20 Gauge | View on Amazon |
This table covers the harness connectors at the Vapor Leak Detection Pump. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
One part is listed for the 2021 Toyota Sienna — STANDARD MOTOR PRODUCTS S2818.
Washer Fluid Level Sensor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | S3320 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Unit | View on Amazon |
This table covers the harness connectors at the Washer Fluid Level Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
One part is listed for the 2021 Toyota Sienna — STANDARD MOTOR PRODUCTS S3320.
Washer Pump Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | S1530 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Connector Shape: OvalHarness Length | View on Amazon |
This table covers the harness connectors at the Washer Pump. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
One part is listed for the 2021 Toyota Sienna — STANDARD MOTOR PRODUCTS S1530.
Buying Electrical Connector Parts for a 2021 Toyota Sienna
On this vehicle, the connector system supplies the pigtails and connector bodies that terminate the vehicle harness at lamps, sensors and modules.
- Confirm you have the 2.5L L4 ELECTRIC/GAS engine — every part on this page is matched to it.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, use heat-shrink crimp connectors rather than twist-and-tape for any pigtail splice, especially outside the cabin.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Trailer Connector and Accelerator Pedal Position Sensor Connector .
Frequently Asked Questions
How many electrical connector parts fit the 2021 Toyota Sienna?
Our catalog currently lists 16 electrical connector parts for the 2021 Toyota Sienna across 14 subcategories and 5 brands, covering the 2.5L L4 ELECTRIC/GAS engine. Each part is matched to the engine(s) it fits.
What are the signs of electrical connector problems on a 2021 Toyota Sienna?
Common symptoms include intermittent faults that move when the harness is wiggled, green corrosion inside a plug, or melted connector housings near heat sources. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, use heat-shrink crimp connectors rather than twist-and-tape for any pigtail splice, especially outside the cabin.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2021 Toyota Sienna was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2021 Toyota Sienna?
Every part on this page is matched to the 2.5L L4 ELECTRIC/GAS engine. Then match the connector by terminal count and keyway, not just appearance — many families look identical but will not lock. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 Toyota Sienna
Electrical Connector Parts for Other Toyota Sienna Years
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