This page lists 15 electrical switch & relay parts for the 2015 International Workstar, across 8 part types, covering all 6 engine options (10.8L L6 DIESEL Turbocharged, 12.4L L6 DIESEL Turbocharged, 7.6L L6 DIESEL Turbocharged, 8.7L L6 DIESEL Turbocharged and more). Every part shows its brand, manufacturer part number and fitment notes.
The switch and relay system on the 2015 International Workstar covers the switches, relays and flashers that route power to everything the driver touches. The largest groups are Blower Switch (4 parts), A/C Refrigerant Pressure Switch (3 parts) and Air Brake Pressure Switch (2 parts). The other 5 part types cover the remaining 6 parts.
The 2015 International Workstar was sold with 6 engines. 1 part fits every engine; the other 14 are engine-specific. Each part shows which engine(s) it fits.
3 brands supply electrical switch & relay parts for the 2015 International Workstar, led by DORMAN (8 parts), UAC (5 parts) and WELLS (2 parts). Quality grades include Economy and Standard Replacement.
Each part number listed for the 2015 International Workstar opens a page with every vehicle that part fits.
A/C Refrigerant Pressure Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: 12.4L L6 DIESEL Turbocharged, 7.6L L6 DIESEL Turbocharged, 8.7L L6 DIESEL Turbocharged, 9.3L L6 DIESEL Turbocharged | 9047790 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| UAC Fits: 12.4L L6 DIESEL Turbocharged, 7.6L L6 DIESEL Turbocharged | SW11423C | 🇺🇸 US 🇨🇦 CA | Low Pressure Switch | View on Amazon |
| UAC Fits: 12.4L L6 DIESEL Turbocharged, 7.6L L6 DIESEL Turbocharged | SW11422C | 🇺🇸 US 🇨🇦 CA | Low Pressure Switch | View on Amazon |
This table covers the pressure switches on the A/C circuit. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
3 A/C Refrigerant Pressure Switch parts are listed for the 2015 International Workstar, from UAC and DORMAN.
Listed part numbers: DORMAN 9047790, UAC SW11423C and UAC SW11422C.
A/C System Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| UAC Fits: all 2015 Workstar engines | RE8434C | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
This table covers the relays that control the A/C System circuit. Typical signs include a click with no action, or a circuit that works only when you swap in a known-good relay. Swap with an identical relay in the fuse box before buying — it is the fastest test there is.
One part is listed for the 2015 International Workstar — UAC RE8434C.
Air Brake Pressure Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: 12.4L L6 DIESEL Turbocharged, 7.6L L6 DIESEL Turbocharged, 8.7L L6 DIESEL Turbocharged, 9.3L L6 DIESEL Turbocharged | 9016001 | 🇺🇸 US 🇨🇦 CA | 7400 | View on Amazon |
| DORMAN Fits: 12.4L L6 DIESEL Turbocharged, 7.6L L6 DIESEL Turbocharged, 8.7L L6 DIESEL Turbocharged, 9.3L L6 DIESEL Turbocharged | 9047791 | 🇺🇸 US 🇨🇦 CA | DashboardAt Dash Valve | View on Amazon |
This table covers the Air Brake Pressure switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
2 Air Brake Pressure Switch parts for the 2015 International Workstar come from DORMAN.
Listed part numbers: DORMAN 9016001 and DORMAN 9047791.
Blower Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| UAC Fits: 12.4L L6 DIESEL Turbocharged, 7.6L L6 DIESEL Turbocharged | SW1000C | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Blower Switch Rotary | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: 12.4L L6 DIESEL Turbocharged, 7.6L L6 DIESEL Turbocharged | 1S15851 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| UAC Fits: 10.8L L6 DIESEL Turbocharged, 9.0L L6 DIESEL Turbocharged | SW1000C | 🇲🇽 MX | Blower Switch Rotary | View on Amazon |
| WELLS Fits: 8.7L L6 DIESEL Turbocharged, 9.3L L6 DIESEL Turbocharged | 1S15851 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the Blower switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
4 Blower Switch parts are listed for the 2015 International Workstar, from UAC and WELLS.
In the Economy grade, UAC supplies 1 part: the catalog's value-priced group. A representative part number is UAC SW1000C.
The Standard Replacement section lists 1 option from WELLS — built to original-equipment specification. WELLS 1S15851 is listed in this group.
2 ungrouped parts are not assigned to a grade, with the same engine-level match.
This group includes UAC SW1000C and WELLS 1S15851 and the remaining parts above.
Clutch Pedal Position / Starter Safety Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: 7.6L L6 DIESEL Turbocharged, 8.7L L6 DIESEL Turbocharged, 9.3L L6 DIESEL Turbocharged | 9015103 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the Clutch Pedal Position / Starter Safety switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
This group shows a single part: DORMAN 9015103.
Cruise Control Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: 7.6L L6 DIESEL Turbocharged, 8.7L L6 DIESEL Turbocharged, 9.3L L6 DIESEL Turbocharged | 9015129 | 🇺🇸 US 🇨🇦 CA | Right | View on Amazon |
| DORMAN Fits: 7.6L L6 DIESEL Turbocharged, 8.7L L6 DIESEL Turbocharged, 9.3L L6 DIESEL Turbocharged | 9010008 | 🇺🇸 US 🇨🇦 CA | Left | View on Amazon |
This table covers the Cruise Control switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
2 Cruise Control Switch parts for the 2015 International Workstar come from DORMAN.
This group includes DORMAN 9015129 and DORMAN 9010008.
Headlamp Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: 7.6L L6 DIESEL Turbocharged, 8.7L L6 DIESEL Turbocharged, 9.3L L6 DIESEL Turbocharged | 9015130 | 🇺🇸 US 🇨🇦 CA | 7400 | View on Amazon |
This table covers the column or dash switches that control the exterior lamps. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
This group shows a single part: DORMAN 9015130.
Outside Mirror Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: 7.6L L6 DIESEL Turbocharged, 8.7L L6 DIESEL Turbocharged, 9.3L L6 DIESEL Turbocharged | 9015126 | 🇺🇸 US 🇨🇦 CA | 7400 | View on Amazon |
This table covers the Outside Mirror switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
This group shows a single part: DORMAN 9015126.
Buying Electrical Switch & Relay Parts for a 2015 International Workstar
On this vehicle, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches.
- Match the engine first. Some electrical switch & relay 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, inspect the connector terminals behind any failed switch — heat damage there will kill the new part too.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Blower Switch and A/C Refrigerant Pressure Switch .
Frequently Asked Questions
How many electrical switch & relay parts fit the 2015 International Workstar?
Our catalog currently lists 15 electrical switch & relay parts for the 2015 International Workstar across 8 subcategories and 3 brands, covering all 6 engine options (10.8L L6 DIESEL Turbocharged, 12.4L L6 DIESEL Turbocharged, 7.6L L6 DIESEL Turbocharged, 8.7L L6 DIESEL Turbocharged and more). Each part is matched to the engine(s) it fits.
Do electrical switch & relay parts differ between 2015 International Workstar engines?
Some do. 1 part fits every engine; the other 14 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 switch & relay problems on a 2015 International Workstar?
Common symptoms include accessories that work intermittently, a click without action, or one function dead while its fuse tests fine. 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, inspect the connector terminals behind any failed switch — heat damage there will kill the new part too.
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 2015 International Workstar 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 2015 International Workstar?
First match the engine — each row shows which engine(s) the part fits. Then swap a suspect relay with an identical known-good one from the fuse box before buying — it is the fastest diagnostic there is. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2015 International Workstar
Electrical Switch & Relay Parts for Other International Workstar Years
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Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.