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 MANUALSCHEVROLET2025TRAILBLAZER LS, 1.2L ENG VIN PREPAIR AND DIAGNOSIS (SINGLE PAGE)ELECTRICALWIRING DIAGRAMSCOMPONENT CONNECTOR END VIEWS (K71-M81)COMPONENT CONNECTOR END VIEWSK73 TELEMATICS COMMUNICATION INTERFACE CONTROL MODULE X1
2025 Chevrolet Trailblazer LS, 1.2L Eng VIN P
K73 Telematics Communication Interface Control Module X1
2025 Chevrolet Trailblazer LS, 1.2L Eng VIN PSECTION K73 Telematics Communication Interface Control Module X1
Connector Part Information
|
Terminal Part Information
| Terminal Type ID | Terminated Lead | Diagnostic Test Probe | Terminal Removal Tool |
|---|---|---|---|
| I | 19370262 | EL-35616-58 (BK) | EL-38125-58 |
| II | 84729890 | J-35616-12 (BU) | J-38125-215A |
| III | Service by Cable | No Tool Required | No Tool Required |
| Pin | Size | Color | Circuit | Function | Terminal Type ID | Option |
|---|---|---|---|---|---|---|
| 1 | 0.5 | RD / BU | 3940 | Battery Positive Voltage | II | - |
| 2 - 3 | - | - | - | Not Occupied | - | - |
| 4 | 0.5 | BK | 3250 | Ground | II | - |
| 5 | - | - | - | Not Occupied | - | - |
| 6 | 0.35 | GN / BK | 2515 | Telematics Switch Supply Voltage | II | - |
| 7 - 8 | - | - | - | Not Occupied | - | - |
| 9 | 0.35 | WH / GN | 1305 | High Speed GMLAN Serial Data [-] 9 | I | - |
| 10 | 0.35 | BU / GN | 1304 | High Speed GMLAN Serial Data [+] 9 | I | - |
| 11 | 0.35 | GN / WH | 2514 | Telematics Switch Signal | I | - |
| 12 | 0.35 | WH / BU | 5986 | Serial Data Communication Enable | I | - |
| 13 | 0.35 | BK | 50 | Ground | I | - |
| 14 | 0.35 | BK / GY | 5152 | Voice Recognition Audio [-] Control | I | - |
| 15 | 0.35 | GY / YE | 5149 | Voice Recognition Audio Signal | I | - |
| 16 | 0.35 | WH / GN | 1305 | High Speed GMLAN Serial Data [-] 9 | I | - |
| 17 | 0.35 | BU / GN | 1304 | High Speed GMLAN Serial Data [+] 9 | I | - |
| 18 | - | - | - | Not Occupied | - | - |
| 19 | 0.35 | YE / VT | 2516 | Telematics Switch Green LED Indicator Control | I | - |
| 20 | - | - | - | Not Occupied | - | - |
| 21 | 0.35 | BK / BN | 654 | Cellular Telephone Microphone Low Reference | I | - |
| 22 | 0.35 | BU | 655 | Cellular Telephone Microphone Signal | I | - |
| 23 | 0.35 | GY / GN | 1102 | Low Speed GMLAN Serial Data 2 | I | - |
| 24 - 25 | - | - | - | Not Occupied | - | - |
| 26 | 0.35 | BN / WH | 2517 | Telematics Switch Red LED Indicator Control | I | - |
| 27 | - | - | - | Not Occupied | - | - |
| 28 | 0.35 | GY / WH | 7211 | Ethernet Bus 4 [+] | III | - |
| 29 | 0.35 | GY | 7210 | Ethernet Bus 4 [-] | III | - |
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.