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 1137 (AUTOMATIC TRANSAXLE - 4T65-E (INTRODUCTION, SERVICE & REPLACEMENT))COMPONENT LOCATORAUTOMATIC TRANSMISSION INTERNAL CONNECTOR END VIEWS
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Automatic Transmission Internal Connector End Views
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Automatic Transmission Internal Connector End Views
WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
1-2 Shift Solenoid Valve Connector, Wiring Harness Side Connector End View
| Connector Part Information |
|
||
|---|---|---|---|
| Pin | Wire Color | Circuit No. | Function |
| A | RD | 839 | Ignition 1 Voltage |
| B | L-GN | 1222 | 1-2 Shift Solenoid Valve Control |
2-3 Shift Solenoid Valve Connector, Wiring Harness Side Connector End View
| Connector Part Information |
|
||
|---|---|---|---|
| Pin | Wire Color | Circuit No. | Function |
| A | RD | 839 | Ignition 1 Voltage |
| B | YE | 1223 | 2-3 Shift Solenoid Valve Control |
Automatic Transmission Fluid Pressure Manual Valve Position Switch Connector, Wiring Harness Side
| Connector Part Information |
|
||
|---|---|---|---|
| Pin | Wire Color | Circuit No. | Function |
| A | WH | 1804 | TCC Release Switch Signal |
| B | - | - | Not Used |
Input Speed Sensor Connector, Wiring Harness Side
| Connector Part Information |
|
||
|---|---|---|---|
| Pin | Wire Color | Circuit No. | Function |
| A | D-GN | 1231 | AT ISS Low Signal |
| B | BK | 1230 | AT ISS High Signal |
Pressure Control Solenoid Valve Connector, Wiring Harness Side
| Connector Part Information |
|
||
|---|---|---|---|
| Pin | Wire Color | Circuit No. | Function |
| A | PU | 1228 | PC Solenoid Valve High Control |
| B | L-BU | 1229 | PC Solenoid Valve Low Control |
Torque Converter Clutch Pulse Width Modulated Solenoid Valve Connector, Wiring Harness Side
| Connector Part Information |
|
||
|---|---|---|---|
| Pin | Wire Color | Circuit No. | Function |
| A | RD | 839 | Ignition 1 Voltage |
| B | TN | 418 | TCC PWM Solenoid Valve Control |
Transmission Fluid Temperature Sensor Connector, Wiring Harness Side
| Connector Part Information |
|
||
|---|---|---|---|
| Pin | Wire Color | Circuit No. | Function |
| A | BN | 1227 | TFT Sensor Signal |
| B | GY | 452 | Low Reference |
Transmission Internal Mode Switch Connector, Wiring Harness Side
| Connector Part Information |
|
||
|---|---|---|---|
| Pin | Wire Color | Circuit No. | Function |
| A | OG | 1786 | Park/Neutral Signal |
| B | GY/WH | 776 | Transmission Range Signal P |
| C | YE/BK | 773 | Transmission Range Signal C |
| D | D-GN/WH | 772 | Transmission Range Signal B |
| E | RD/BK | 771 | Transmission Range Signal A |
| F | BK/WH | 1050 | Ground |
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.