The 2021 Toyota Highlander has 37 electrical connector parts with verified fitment on this page — 23 part types and 8 brands, covering both the 2.5L L4 ELECTRIC/GAS and the 3.5L V6. Each part includes a manufacturer part number and application notes.
On the 2021 Toyota Highlander, the connector system supplies the pigtails and connector bodies that terminate the vehicle harness at lamps, sensors and modules. 14 parts of the 37 listed are Trailer Connector (7 parts), Ignition Coil Connector (5 parts) and Battery Current Sensor Connector (2 parts). The other 20 part types cover the remaining 23 parts.
The 2021 Toyota Highlander was sold with both the 2.5L L4 ELECTRIC/GAS and the 3.5L V6. 26 parts fit every engine; the other 11 are engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 2021 Toyota Highlander electrical connector parts are STANDARD MOTOR PRODUCTS (24 parts), CURT (4 parts) and TEKONSHA (3 parts), plus 5 more brands.
2 parts on this 2021 Toyota Highlander page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including CURT 55245 (Trailer Connector) and CURT 56524 (Trailer Connector). Click any part number to see every vehicle that part fits.
A/C Compressor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: all 2021 Highlander engines | S2539 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with 3 Female Terminals | View on Amazon |
This table covers the harness connectors at the A/C Compressor. 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 Highlander — STANDARD MOTOR PRODUCTS S2539.
ABS Wheel Speed Sensor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: all 2021 Highlander engines | S2826 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Includes ABS Wheel Speed Sensor Wire Harness | View on Amazon |
This table covers the harness connectors at each ABS wheel-speed 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 Highlander — STANDARD MOTOR PRODUCTS S2826.
Accelerator Pedal Position Sensor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: all 2021 Highlander engines | 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 Highlander — STANDARD MOTOR PRODUCTS S2815.
Battery Current Sensor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HOLSTEIN Fits: all 2021 Highlander engines | 2HAR0036 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Includes ABS Wheel Speed Sensor Wire Harness | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: all 2021 Highlander engines | S1686 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Connector Shape: OvalBlack | View on Amazon |
This table covers the harness connectors at the Battery Current 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.
2 Battery Current Sensor Connector parts are listed for the 2021 Toyota Highlander, from HOLSTEIN and STANDARD MOTOR PRODUCTS. All of them fit every engine offered in the 2021 Highlander.
Part numbers include HOLSTEIN 2HAR0036 and STANDARD MOTOR PRODUCTS S1686.
Blower Motor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: all 2021 Highlander engines | S3204 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rearwith 2 Terminal(s) | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: all 2021 Highlander engines | 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.
STANDARD MOTOR PRODUCTS supplies both parts for the 2021 Toyota Highlander. All of them fit every engine offered in the 2021 Highlander.
This group includes STANDARD MOTOR PRODUCTS S3204 and STANDARD MOTOR PRODUCTS S3208.
Camshaft Position Sensor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 3.5L V6 | S2837 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
This table covers the harness connectors at the Camshaft 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 Highlander — STANDARD MOTOR PRODUCTS S2837.
Fuel Injector Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 2.5L L4 ELECTRIC/GAS | S2544 | 🇺🇸 US 🇨🇦 CA | Harness Lengthinches: 13 | View on Amazon |
This table covers the harness connectors at the Fuel Injector. 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 Highlander — STANDARD MOTOR PRODUCTS S2544.
HVAC Control Switch / Panel Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GPD Fits: all 2021 Highlander engines | 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 Highlander — GPD 1713413.
Ignition Coil Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 2.5L L4 ELECTRIC/GAS | S2438 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| STANDARD MOTOR PRODUCTS Fits: 3.5L V6 | S3291 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with Housing | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: 3.5L V6 | S2527 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Complete Assembly | View on Amazon |
| UNITED MOTOR PRODUCTS Fits: 3.5L V6 | CON208 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| WALKER PRODUCTS Fits: 3.5L V6 | 2701082 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Round | 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.
5 Ignition Coil Connector parts are listed for the 2021 Toyota Highlander, from STANDARD MOTOR PRODUCTS, UNITED MOTOR PRODUCTS and WALKER PRODUCTS.
Listed part numbers: STANDARD MOTOR PRODUCTS S2438, STANDARD MOTOR PRODUCTS S3291 and STANDARD MOTOR PRODUCTS S2527, plus the other parts above.
Knock / Detonation Sensor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: all 2021 Highlander engines | 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 Highlander — STANDARD MOTOR PRODUCTS S2328.
Mass Air Flow (MAF) Sensor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: all 2021 Highlander engines | 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.
Park Assist (PAS) Camera Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| METRA Fits: all 2021 Highlander engines | AXDSPXTY3 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Camera Add-On Package | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: all 2021 Highlander engines | S3297 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rear | View on Amazon |
This table covers the harness connectors at the Park Assist (PAS) Camera. 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.
2 Park Assist (PAS) Camera Connector parts for the 2021 Toyota Highlander come from 2 brands — METRA and STANDARD MOTOR PRODUCTS. Every part fits both the 2.5L L4 ELECTRIC/GAS and the 3.5L V6.
This group includes METRA AXDSPXTY3 and STANDARD MOTOR PRODUCTS S3297.
Parking / Turn Signal Lamp Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: all 2021 Highlander engines | S2537 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front | View on Amazon |
This table covers the harness connectors at the Parking / Turn Signal Lamp. 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 Highlander — STANDARD MOTOR PRODUCTS S2537.
Radio Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| METRA Fits: all 2021 Highlander engines | 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.
Starter Solenoid Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 3.5L V6 | S2549 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
This table covers the harness connectors at the Starter 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 Highlander — STANDARD MOTOR PRODUCTS S2549.
Temperature Sender / Sensor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 2.5L L4 ELECTRIC/GAS | S3203 | 🇺🇸 US 🇨🇦 CA | 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 Highlander — STANDARD MOTOR PRODUCTS S3203.
Throttle Control Actuator Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 2.5L L4 ELECTRIC/GAS | S2815 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| STANDARD MOTOR PRODUCTS Fits: 3.5L V6 | S2817 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
This table covers the harness connectors at the Throttle Control Actuator. 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.
STANDARD MOTOR PRODUCTS supplies both parts for the 2021 Toyota Highlander.
Listed part numbers: STANDARD MOTOR PRODUCTS S2815 and STANDARD MOTOR PRODUCTS S2817.
Trailer Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CURT Popular Fits: all 2021 Highlander engines | 55245 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Custom Wiring Connector4-Way Flat | View on Amazon |
| CURT Popular Fits: all 2021 Highlander engines | 56524 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Custom Wiring Harness4-Way Flat | View on Amazon |
| CURT Fits: all 2021 Highlander engines | 56480 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Custom Wiring Harness4-Way Flat | View on Amazon |
| CURT Fits: all 2021 Highlander engines | 56452 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 4-WayFlat Output | View on Amazon |
| TEKONSHA Fits: all 2021 Highlander engines | 118292 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Tow Harness Wiring Package4-Way Flat | View on Amazon |
| TEKONSHA Fits: all 2021 Highlander engines | 118827 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | T-One Connector Assembly | View on Amazon |
| TEKONSHA Fits: all 2021 Highlander engines | 22125 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Tow Harness Wiring Package | 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.
7 Trailer Connector parts for the 2021 Toyota Highlander come from 2 brands — CURT and TEKONSHA. The "Popular" part is CURT 55245. Every part fits both the 2.5L L4 ELECTRIC/GAS and the 3.5L V6.
This group includes CURT 55245, CURT 56524 and CURT 56480 and the remaining parts above.
Turn Signal Switch Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: all 2021 Highlander engines | S3083 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Connector Shape: Rectangle | View on Amazon |
This table covers the harness connectors at the Turn Signal Switch. 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 S3083.
Vapor Canister Purge Valve / Solenoid Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: all 2021 Highlander engines | 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 Highlander — STANDARD MOTOR PRODUCTS S1530.
Vapor Leak Detection Pump Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: all 2021 Highlander engines | 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 Highlander — STANDARD MOTOR PRODUCTS S2818.
Washer Fluid Level Sensor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: all 2021 Highlander engines | 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 Highlander — STANDARD MOTOR PRODUCTS S3320.
Washer Pump Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: all 2021 Highlander engines | S3083 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Connector Shape: Rectangle | 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 Highlander — STANDARD MOTOR PRODUCTS S3083.
Buying Electrical Connector Parts for a 2021 Toyota Highlander
On this vehicle, the connector system supplies the pigtails and connector bodies that terminate the vehicle harness at lamps, sensors and modules.
- Match the engine first. Some electrical connector parts fit every engine; others are engine-specific. Each row shows which engine(s) it fits.
- 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 Ignition Coil Connector .
Frequently Asked Questions
How many electrical connector parts fit the 2021 Toyota Highlander?
Our catalog currently lists 37 electrical connector parts for the 2021 Toyota Highlander across 23 subcategories and 8 brands, covering both the 2.5L L4 ELECTRIC/GAS and the 3.5L V6. Each part is matched to the engine(s) it fits.
Do electrical connector parts differ between 2021 Toyota Highlander engines?
Some do. 26 parts fit every engine; the other 11 are engine-specific. Each row (and the filter at the top) shows which. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.
What are the signs of electrical connector problems on a 2021 Toyota Highlander?
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 Highlander 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 Highlander?
First match the engine — each row shows which engine(s) the part fits. 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 Highlander
Electrical Connector Parts for Other Toyota Highlander Years
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