Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1353 (HVAC SYSTEMS - MANUAL)COMPONENT LOCATORHVAC CONNECTOR END VIEWS
2003 Chevrolet TrailBlazer 4.2 S, 4WD
HVAC Connector End Views
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION HVAC Connector End Views
WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
A/C Fresh/Recirculation Switch Connector End View
| Connector Part Information |
|
|
|---|---|---|
| Pin | Wire Color | Function |
| 1 | WH/BK | Ground |
| 2 | GN/WH | Fresh Position Actuator Control |
| 3 | - | Not Used |
| 4 | RD/WH | AC Switch Feed Circuit |
| 5 | BU/WH | Recirculation Position Actuator Control |
| 6 | GN | Illumination Lamps Supply Voltage |
| 7 | WH/BK | Illumination Lamps Ground |
| 8 | GN/WH | A/C Indicator Control |
| 9 | YE | AC Request Signal Circuit |
| 10 | BK | AC Request Feed Circuit |
Defogger Mode Switch Connector End View
| Connector Part Information |
|
|
|---|---|---|
| Pin | Wire Color | Function |
| 1 | YE | AC Request Signal Circuit |
| 2 | BK | AC Request Feed Circuit |
Fresh/Recirculation Air Inlet Actuator Connector End View
| Connector Part Information |
|
|
|---|---|---|
| Pin | Wire Color | Function |
| 1 | GN/WH | Fresh Position Control |
| 2 | BU/WH | Recirculation Position Control |
Blower Motor Connector End View
| Connector Part Information |
|
|
|---|---|---|
| Pin | Wire Color | Function |
| A | BK | Blower Motor Feed Circuit |
| B | BK/WH | Blower Motor Resistor Control Circuit |
Blower Motor Resistor
| Connector Part Information |
|
|
|---|---|---|
| Pin | Wire Color | Function |
| A | RD | Ground |
| B | LT BU | Medium 1 |
| C | BK/WH | Medium 2 |
| D | WH/BK | High |
Blower Switch Connector End View
| Connector Part Information |
|
|
|---|---|---|
| Pin | Wire Color | Function |
| 1 | BU/WH | Blower Control Medium 2 |
| 2 | RD | Blower Control Medium 1 |
| 3 | WH/BK | Illumination Ground |
| 4 | BK/WH | Blower Control High |
| 5 | WH/BK | Ground |
| 6 | BU/WH | Heater Relay Control Circuit |
| 7 | - | Not Used |
| 8 | GN | Illumination Supply Voltage |
Evaporator Temperature Sensor Connector End View
| Connector Part Information |
|
|
|---|---|---|
| Pin | Wire Color | Function |
| 1 | BK/BU | Sensor High |
| 2 | BN | Sensor Low |
Fan Motor Connector End View
| Connector Part Information |
|
|
|---|---|---|
| Pin | Wire Color | Function |
| 1 | WH/RD | Fan Motor Control Circuit |
| 2 | BK/RD | Fan Motor Feed Circuit |
Fan Resistor Connector End View
| Connector Part Information |
|
|
|---|---|---|
| Pin | Wire Color | Function |
| 1 | WH/BK | Ground |
| 2 | BU/WH | Low Speed Fan Control Circuit |
Refrigerant Pressure Switch Connector End View
| Connector Part Information |
|
|
|---|---|---|
| Pin | Wire Color | Function |
| 1 | YE | Pressure Signal to PCM |
| 2 | WH/BK | Ground |
| 3 | LT GN/BK | High Speed Fan Control |
| 4 | WH/BK | Ground |
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.