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.
K73 Telematics Communication Interface Control Module X1
2025 Chevrolet Trailblazer ACTIV, FWDSECTION 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.