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.
SYS.OK|MANUAL.DBβ LIVE
HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1391 (DATA LINK COMMUNICATION SYSTEM)COMPONENT LOCATORDATA LINK COMMUNICATIONS CONNECTORS
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Data Link Communications Connectors
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Data Link Communications Connectors
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Data Link Connector (DLC) Connector End View
| Connector Part Information |
|
||
|---|---|---|---|
| Pin | Wire Color | Circuit No. | Function |
| 1 | - | - | Not Used |
| 2 | PU | 1132 | DLC Class 2 Serial Data |
| 3 | - | - | Not Used |
| 4 | BK | 2250 | Ground |
| 5 | BK/WH | 751 | Ground |
| 6-15 | - | - | Not Used |
| 16 | OG | 640 | Battery Positive Voltage |
Splice Pack SP205 Connector End View
| Connector Part Information |
|
||
|---|---|---|---|
| Pin | Wire Color | Circuit No. | Function |
| A | PU | 1132 | DLC Class 2 Serial Data |
| B | D-GN | 1049 | PCM Class 2 Serial Data |
| C | D-GN/WH | 1133 | ATC Class 2 Serial Data (NP4/NP8) |
| D | YE | 5679 | Digital Radio Receiver Class 2 Serial Data |
| E | L-BU | 1122 | ABS/TCS Class 2 Serial Data |
| F | D-BU | 1128 | SDM Class 2 Serial Data |
| G | GY | 1036 | IPC Class 2 Serial Data |
| H | D-BU/WH | 2218 | Serial Communications Circuit |
| J | OG | 1044 | Radio Class 2 Serial Data |
| K | GY | 2289 | Rear HVAC/Audio Class 2 Serial Data |
| L | WH | 1038 | HVAC Class 2 Serial Data |
| M | L-GN | 1037 | BCM Class 2 Serial Data |
Splice Pack SP306 Connector End View (Except XUV)
| Connector Part Information |
|
||
|---|---|---|---|
| Pin | Wire Color | Circuit No. | Function |
| A | L-GN/BK | 1098 | VCIM Serial Data (UE1) |
| B | BN/WH | 1048 | Memory Seat Module Class 2 Serial Data (AAB) |
| C | L-BU | 2288 | LGM Class 2 Serial Data |
| D | - | - | Not Used |
| E | D-BU | 2272 | Amplifier Class 2 Serial Data (UQA w/Class 2 Amp) |
| F | YE/BK | 5485 | DVD Class 2 Serial Data (U42) |
| G-H | - | - | Not Used |
| J | TN | 1047 | FPDM Class 2 Serial Data |
| K | BN | 1046 | DDM Class 2 Serial Data |
| L | - | - | Not Used |
| M | D-BU/WH | 2218 | Serial Communications Circuit |
Splice Pack SP306 Connector End View (XUV)
| Connector Part Information |
|
||
|---|---|---|---|
| Pin | Wire Color | Circuit No. | Function |
| A | L-GN/BK | 1098 | VCIM Serial Data (UE1) |
| B | L-BU | 2288 | EGM Class 2 Serial Data |
| C | BN | 1046 | DDM Class 2 Serial Data |
| D | TN | 1047 | FPDM Class 2 Serial Data |
| E | D-BU | 2272 | Amplifier Class 2 Serial Data (UQA w/Class 2 Amp) |
| F | D-BU/WH | 2218 | Serial Communications Circuit |
| G | - | - | Not Used |
| H | BN/WH | 1048 | Memory Seat Module Class 2 Serial Data (AAB) |
| J | PU | 5513 | Power Roof Module Class 2 Serial Data |
| K-M | - | - | Not Used |
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:
- 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.