The 2021 Chevrolet Blazer has 73 electrical switch & relay parts with verified fitment on this page — 27 part types and 15 brands, covering all 3 engine options (2.0L L4 Turbocharged, 2.5L L4 and 3.6L V6). Each part includes a manufacturer part number and application notes.
On the 2021 Chevrolet Blazer, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches. 28 parts of the 73 listed are Oil Pressure Sender / Switch (12 parts), Power Window Switch (10 parts) and A/C Refrigerant Pressure Switch (6 parts). The other 24 part types cover the remaining 45 parts.
The 2021 Chevrolet Blazer was sold with 3 engines. 52 parts fit every engine; the other 21 are engine-specific. Each part shows which engine(s) it fits.
15 brands supply electrical switch & relay parts for the 2021 Chevrolet Blazer, led by GM GENUINE (33 parts), WELLS (11 parts) and STANDARD MOTOR PRODUCTS (9 parts), plus 12 more brands. Quality grades include Economy and Standard Replacement.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2021 Chevrolet Blazer. 8 parts have it, including FOUR SEASONS 20915 (A/C Refrigerant Pressure Switch) and STANDARD MOTOR PRODUCTS PS623 (Oil Pressure Sender / Switch). Each part number opens a page with every vehicle that part fits.
A/C Compressor Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO Fits: all 2021 Blazer engines | 13361778 | 🇺🇸 US 🇨🇦 CA | GM Original Equipment | View on Amazon |
This table covers the relays that control the A/C Compressor 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 2021 Chevrolet Blazer — ACDELCO 13361778.
A/C Refrigerant Pressure Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FOUR SEASONS Popular Fits: all 2021 Blazer engines | 20915 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Pressure Switch | View on Amazon |
| GM GENUINE Popular Fits: 3.6L V6 | 1551343 | 🇺🇸 US 🇨🇦 CA | LT Model or Premier or RS ModelUse On Vehicles with Circle Connection To Engine Wiring Harness | View on Amazon |
| GM GENUINE Fits: 2.0L L4 Turbocharged, 2.5L L4 | 1551388 | 🇺🇸 US 🇨🇦 CA | LT Model or PremierUse On Vehicles with Flat/Oval Connection To Engine Wiring Harness | View on Amazon |
| GPD Fits: all 2021 Blazer engines | 1713410 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Transducerwith 3 Terminal(s) | View on Amazon |
| UAC Fits: all 2021 Blazer engines | SW11475C | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | High Pressure Switch | View on Amazon |
| UAC Fits: 2.5L L4, 3.6L V6 | SW10093C | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Pressure Transducer | 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.
6 A/C Refrigerant Pressure Switch parts are listed for the 2021 Chevrolet Blazer, from GM GENUINE, UAC, FOUR SEASONS and 1 other brand. FOUR SEASONS 20915 carries the "Popular" badge. 3 parts fit every engine; the other 3 are engine-specific.
This group includes FOUR SEASONS 20915, GM GENUINE 1551343 and GM GENUINE 1551388 and the remaining parts above.
Brake Light Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AUTOTECNICA Fits: all 2021 Blazer engines | CE1322627 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| VEMO Fits: all 2021 Blazer engines | V51730194 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | LT Model or PremierStop Light Switch, 3 Pins | View on Amazon |
This table covers the pedal-mounted switch that turns on the brake 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.
2 Brake Light Switch parts are listed for the 2021 Chevrolet Blazer, from AUTOTECNICA and VEMO. All of them fit every engine offered in the 2021 Blazer.
Part numbers include AUTOTECNICA CE1322627 and VEMO V51730194.
Brake Pressure Warning Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: all 2021 Blazer engines | 23139898 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the Brake Pressure Warning 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: GM GENUINE 23139898.
Cruise Control Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 2.0L L4 Turbocharged, 3.6L V6 | 13553607 | 🇺🇸 US 🇨🇦 CA | LeftPremier | View on Amazon |
| GM GENUINE Fits: 2.0L L4 Turbocharged, 3.6L V6 | 13553606 | 🇺🇸 US 🇨🇦 CA | LeftPremier | View on Amazon |
| GM GENUINE Fits: all 2021 Blazer engines | 13553608 | 🇺🇸 US 🇨🇦 CA | LeftLT Model | 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.
3 Cruise Control Switch parts for the 2021 Chevrolet Blazer come from GM GENUINE. 1 part fits every engine; the other 2 are engine-specific.
Part numbers include GM GENUINE 13553607, GM GENUINE 13553606 and GM GENUINE 13553608.
Dimmer Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: all 2021 Blazer engines | CBS2427 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with Automatic High Beam | View on Amazon |
| WELLS Fits: all 2021 Blazer engines | 1S15093 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Indicator Markings Color: White | View on Amazon |
| WELLS Fits: all 2021 Blazer engines | 1S15092 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with Automatic High BeamExcept Rear Fog Lights | View on Amazon |
This table covers the dimmer switches that select headlamp high and low beam. 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 Dimmer Switch parts for the 2021 Chevrolet Blazer come from 2 brands — WELLS and STANDARD MOTOR PRODUCTS. Every part fits all 3 engine options (2.0L L4 Turbocharged, 2.5L L4 and 3.6L V6).
Part numbers include STANDARD MOTOR PRODUCTS CBS2427, WELLS 1S15093 and WELLS 1S15092.
Door Lock Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: all 2021 Blazer engines | 86807637 | 🇺🇸 US 🇨🇦 CA | BlackInstruction Manual Included: No | View on Amazon |
| GM GENUINE Fits: all 2021 Blazer engines | 86807636 | 🇺🇸 US 🇨🇦 CA | LeftJet Black | View on Amazon |
This table covers the Door Lock 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.
GM GENUINE supplies both parts for the 2021 Chevrolet Blazer. All of them fit every engine offered in the 2021 Blazer.
Part numbers include GM GENUINE 86807637 and GM GENUINE 86807636.
Electronic Suspension Control Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: all 2021 Blazer engines | 87846098 | 🇺🇸 US 🇨🇦 CA | Instruction Manual Included: No | View on Amazon |
This table covers the Electronic Suspension 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.
This group shows a single part: GM GENUINE 87846098.
Engine Control Module Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: all 2021 Blazer engines | 13455283 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the relays that control the Engine Control Module 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.
This group shows a single part: GM GENUINE 13455283.
Hazard Warning Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: all 2021 Blazer engines | 84840439 | 🇺🇸 US 🇨🇦 CA | Non-Latching Disable Stop/Start Engine Control (ENL)Jet Black | View on Amazon |
| WELLS Fits: all 2021 Blazer engines | 1S18152 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
This table covers the Hazard Warning 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 Hazard Warning Switch parts for the 2021 Chevrolet Blazer come from 2 brands — GM GENUINE and WELLS. Every part fits all 3 engine options (2.0L L4 Turbocharged, 2.5L L4 and 3.6L V6).
Listed part numbers: GM GENUINE 84840439 and WELLS 1S18152.
Headlamp Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: all 2021 Blazer engines | 13455283 | 🇺🇸 US 🇨🇦 CA | Low Beam | View on Amazon |
This table covers the relays that control the Headlamp 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 2021 Chevrolet Blazer — GM GENUINE 13455283.
Headlamp Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: all 2021 Blazer engines | 85643167 | 🇺🇸 US 🇨🇦 CA | Switch Mounting Type: Snap In | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: all 2021 Blazer engines | HLS1769 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | without Fog Lightswith Automatic Headlights | View on Amazon |
| WELLS Fits: all 2021 Blazer engines | 1S16914 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | without Automatic Leveling Systemwith Automatic Headlights | 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.
3 Headlamp Switch parts for the 2021 Chevrolet Blazer come from 3 brands — GM GENUINE, STANDARD MOTOR PRODUCTS and WELLS. Every part fits all 3 engine options (2.0L L4 Turbocharged, 2.5L L4 and 3.6L V6).
Listed part numbers: GM GENUINE 85643167, STANDARD MOTOR PRODUCTS HLS1769 and WELLS 1S16914.
Ignition Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: all 2021 Blazer engines | 13468935 | 🇺🇸 US 🇨🇦 CA | ELECTRONIC, 5 BLADEELECTRONIC RELAY ISO MINI SPDT | View on Amazon |
This table covers the relays that control the Ignition 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.
This group shows a single part: GM GENUINE 13468935.
Ignition Starter Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: all 2021 Blazer engines | US1511 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Attachment Method: Direct | View on Amazon |
This table covers the ignition switches that feed the starter 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.
This group shows a single part: STANDARD MOTOR PRODUCTS US1511.
Liftgate Close Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: all 2021 Blazer engines | D1488G | 🇺🇸 US 🇨🇦 CA | Fits LT Modelwith Power Lift Gate (TB5),Interior Trim Color (4AA) | View on Amazon |
This table covers the Liftgate Close 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: GM GENUINE D1488G.
Oil Pressure Sender / Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: all 2021 Blazer engines | 926397 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 3 Way with Leadswith Flat Connector | View on Amazon |
| DORMAN Fits: 2.5L L4 | 926394 | 🇺🇸 US | with Flat Connector, 3 Way Female GT150 | View on Amazon |
| HOLSTEIN Fits: 2.0L L4 Turbocharged, 3.6L V6 | 2OPS0020 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with Light | View on Amazon |
| HOLSTEIN Fits: 2.5L L4 | 2OPS0062 | 🇺🇸 US | View on Amazon | |
| UNITED MOTOR PRODUCTS Fits: 2.0L L4 Turbocharged, 3.6L V6 | OPS322 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with Light | View on Amazon |
| UNITED MOTOR PRODUCTS Fits: 2.5L L4 | OPS339 | 🇺🇸 US | with Light | View on Amazon |
| WALKER PRODUCTS Fits: 2.0L L4 Turbocharged, 3.6L V6 | 2561004 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Includes Seal | View on Amazon |
| WALKER PRODUCTS Fits: 2.5L L4 | 2561028 | 🇺🇸 US | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Popular Fits: 2.0L L4 Turbocharged, 3.6L V6 | PS623 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Connector Shape: Rectangle, OvalSensor Only | View on Amazon |
| STANDARD MOTOR PRODUCTS Popular Fits: 2.5L L4 | PS660 | 🇺🇸 US | View on Amazon | |
| WELLS Popular Fits: all 2021 Blazer engines | 1S12693 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Connector Gender: Female | View on Amazon |
| GM GENUINE Fits: 2.5L L4 | 25202591 | 🇺🇸 US 🇨🇦 CA | FWDTrans.Code 9T50 | View on Amazon |
This table covers the senders and switches that report oil pressure to the gauge or lamp. Typical signs include a lamp that stays on, or a gauge that never moves. Confirm power and ground at the connector before replacing the sender or switch.
12 Oil Pressure Sender / Switch parts are listed for the 2021 Chevrolet Blazer, from DORMAN, HOLSTEIN, UNITED MOTOR PRODUCTS and 4 other brands. STANDARD MOTOR PRODUCTS PS623 carries the "Popular" badge. 2 parts fit every engine; the other 10 are engine-specific.
In the Economy grade, DORMAN, HOLSTEIN, UNITED MOTOR PRODUCTS and 1 other brand supply 8 parts: the catalog's value-priced group. A representative part number is DORMAN 926397.
The Standard Replacement section lists 4 options from STANDARD MOTOR PRODUCTS, WELLS and GM GENUINE — built to original-equipment specification. STANDARD MOTOR PRODUCTS PS623 is listed in this group.
Parking Brake Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: all 2021 Blazer engines | 87868027 | 🇺🇸 US 🇨🇦 CA | JET BLACK | View on Amazon |
This table covers the Parking Brake 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.
One part is listed for the 2021 Chevrolet Blazer — GM GENUINE 87868027.
Power Seat Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AUTOTECNICA Fits: all 2021 Blazer engines | GM1322316 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Left8 Way Adjustment | View on Amazon |
| DORMAN Fits: all 2021 Blazer engines | 901271 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Left8 Way Adjustment | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ROSTRA Fits: all 2021 Blazer engines | 662584 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Left8 Way Adjustment | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: all 2021 Blazer engines | PSW149 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Connector Shape: Rectangle | View on Amazon |
This table covers the Power Seat 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 Power Seat Switch parts for the 2021 Chevrolet Blazer come from 4 brands — AUTOTECNICA, DORMAN, ROSTRA and 1 other brand. Every part fits all 3 engine options (2.0L L4 Turbocharged, 2.5L L4 and 3.6L V6).
The Economy section: 2 options from AUTOTECNICA and DORMAN. AUTOTECNICA GM1322316 is listed in this group.
Standard Replacement: 2 parts, from ROSTRA and STANDARD MOTOR PRODUCTS. A representative part number is ROSTRA 662584.
Listed part numbers: AUTOTECNICA GM1322316, DORMAN 901271 and ROSTRA 662584, plus the other parts above.
Power Window Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Popular Fits: all 2021 Blazer engines | 84699725 | 🇺🇸 US 🇨🇦 CA | Fits Front LeftLT Model | View on Amazon |
| GM GENUINE Popular Fits: all 2021 Blazer engines | 85694267 | 🇺🇸 US 🇨🇦 CA | RearJET BLACK | View on Amazon |
| GM GENUINE Fits: 2.0L L4 Turbocharged, 3.6L V6 | 85694265 | 🇺🇸 US 🇨🇦 CA | Fits Front LeftPremier | View on Amazon |
| GM GENUINE Fits: 3.6L V6 | 85694269 | 🇺🇸 US 🇨🇦 CA | Fits Front RightRS Model | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: all 2021 Blazer engines | DWS2048 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rear | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: all 2021 Blazer engines | DWS2050 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Terminal Type: Blade and Pin | View on Amazon |
| WELLS Fits: 2.5L L4 | 1S15757 | 🇺🇸 US | Rear | View on Amazon |
| WELLS Fits: 2.5L L4 | 1S15762 | 🇺🇸 US | Front Leftwith One-Touch Open/Close Windows | View on Amazon |
| WELLS Fits: 2.5L L4 | 1S15808 | 🇺🇸 US | Front Leftwith One-Touch Open Windows | View on Amazon |
| WELLS Fits: 2.5L L4 | 1S16100 | 🇺🇸 US | Front Right | View on Amazon |
This table covers the switches that command each window motor. 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.
10 Power Window Switch parts are listed for the 2021 Chevrolet Blazer, from GM GENUINE, WELLS and STANDARD MOTOR PRODUCTS. GM GENUINE 84699725 carries the "Popular" badge. 4 parts fit every engine; the other 6 are engine-specific.
Seat Heater Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ULTRA-POWER Fits: all 2021 Blazer engines | PSW149 | 🇺🇸 US 🇨🇦 CA | Seat Control SwitchPower Seat Switch | View on Amazon |
This table covers the Seat Heater 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: ULTRA-POWER PSW149.
Starter Motor Control Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: all 2021 Blazer engines | 13468934 | 🇺🇸 US 🇨🇦 CA | 4-Terminal 630 Series Single Pole Double Throw MiniFrom Block Assembly | View on Amazon |
| GM GENUINE Fits: all 2021 Blazer engines | 13455283 | 🇺🇸 US 🇨🇦 CA | Accessory | View on Amazon |
This table covers the relays that control the Starter Motor Control 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.
2 Starter Motor Control Relay parts for the 2021 Chevrolet Blazer come from GM GENUINE. Every part fits all 3 engine options (2.0L L4 Turbocharged, 2.5L L4 and 3.6L V6).
Part numbers include GM GENUINE 13468934 and GM GENUINE 13455283.
Steering Wheel Audio Control Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: all 2021 Blazer engines | 13540148 | 🇺🇸 US 🇨🇦 CA | Fits VolumeLT Model | View on Amazon |
| GM GENUINE Fits: all 2021 Blazer engines | 13540147 | 🇺🇸 US 🇨🇦 CA | Fits PresetsLT Model | View on Amazon |
| GM GENUINE Fits: all 2021 Blazer engines | 13549506 | 🇺🇸 US 🇨🇦 CA | Fits RightLT Model | View on Amazon |
This table covers the Steering Wheel Audio 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.
GM GENUINE supplies the 3 Steering Wheel Audio Control Switch parts for the 2021 Chevrolet Blazer. All of them fit every engine offered in the 2021 Blazer.
This group includes GM GENUINE 13540148, GM GENUINE 13540147 and GM GENUINE 13549506.
Traction / Stability Control Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: all 2021 Blazer engines | 84710915 | 🇺🇸 US 🇨🇦 CA | JET BLACK | View on Amazon |
This table covers the Traction / Stability 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.
One part is listed for the 2021 Chevrolet Blazer — GM GENUINE 84710915.
Trunk Lid / Tailgate Release Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: all 2021 Blazer engines | 13571354 | 🇺🇸 US 🇨🇦 CA | RearLabeled 13571354 | View on Amazon |
| GM GENUINE Fits: all 2021 Blazer engines | 84389158 | 🇺🇸 US 🇨🇦 CA | Fits LT Model or PremierJet Black | View on Amazon |
This table covers the Trunk Lid / Tailgate Release 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 Trunk Lid / Tailgate Release Switch parts for the 2021 Chevrolet Blazer come from GM GENUINE. Every part fits all 3 engine options (2.0L L4 Turbocharged, 2.5L L4 and 3.6L V6).
Part numbers include GM GENUINE 13571354 and GM GENUINE 84389158.
Turn Signal Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: all 2021 Blazer engines | 920760 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Left | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Popular Fits: all 2021 Blazer engines | 84925178 | 🇺🇸 US 🇨🇦 CA | Black | View on Amazon |
| GM GENUINE Fits: all 2021 Blazer engines | 84925176 | 🇺🇸 US 🇨🇦 CA | Black | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: all 2021 Blazer engines | CBS2427 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with Automatic High Beam | View on Amazon |
| WELLS Fits: all 2021 Blazer engines | 1S15093 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Indicator Markings Color: White | View on Amazon |
This table covers the combination / turn-signal 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.
5 Turn Signal Switch parts are listed for the 2021 Chevrolet Blazer, from GM GENUINE, DORMAN, STANDARD MOTOR PRODUCTS and 1 other brand. GM GENUINE 84925178 carries the "Popular" badge. All of them fit every engine offered in the 2021 Blazer.
Economy: 1 part, from DORMAN. A representative part number is DORMAN 920760.
The Standard Replacement section: 4 options from GM GENUINE, STANDARD MOTOR PRODUCTS and WELLS. GM GENUINE 84925178 is listed in this group.
This group includes GM GENUINE 84925178, DORMAN 920760 and GM GENUINE 84925176 and the remaining parts above.
Wiper / Washer Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: all 2021 Blazer engines | 84925179 | 🇺🇸 US 🇨🇦 CA | LABELED 84925179,84414719,84414715,84353931,84175592,23117433JET BLACK | View on Amazon |
| WELLS Fits: all 2021 Blazer engines | 1S16807 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
This table covers the Wiper / Washer 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 Wiper / Washer Switch parts for the 2021 Chevrolet Blazer come from 2 brands — GM GENUINE and WELLS. Every part fits all 3 engine options (2.0L L4 Turbocharged, 2.5L L4 and 3.6L V6).
Listed part numbers: GM GENUINE 84925179 and WELLS 1S16807.
Wiring Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: all 2021 Blazer engines | 84310952 | 🇺🇸 US 🇨🇦 CA | Connector Gender: Female | View on Amazon |
This table covers the relays that control the Wiring 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 2021 Chevrolet Blazer — GM GENUINE 84310952.
Buying Electrical Switch & Relay Parts for a 2021 Chevrolet Blazer
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: Oil Pressure Sender / Switch and Power Window Switch .
Frequently Asked Questions
How many electrical switch & relay parts fit the 2021 Chevrolet Blazer?
Our catalog currently lists 73 electrical switch & relay parts for the 2021 Chevrolet Blazer across 27 subcategories and 15 brands, covering all 3 engine options (2.0L L4 Turbocharged, 2.5L L4 and 3.6L V6). Each part is matched to the engine(s) it fits.
Do electrical switch & relay parts differ between 2021 Chevrolet Blazer engines?
Some do. 52 parts fit every engine; the other 21 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 2021 Chevrolet Blazer?
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 2021 Chevrolet Blazer 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 Chevrolet Blazer?
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 2021 Chevrolet Blazer
Electrical Switch & Relay Parts for Other Chevrolet Blazer 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.