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.
Trailer Can Gateway Module
DESCRIPTION
| 1 - TGWM |
| 2 - Trailer Connector |
The Trailer CAN Gateway Module (TGWM) , if equipped, is located in the instrument panel, on the driver side of the center stack. Refer to MODULE, TRAILER CAN GATEWAY MODULE (TCGWM), REMOVAL AND INSTALLATION .
The TGWM is a security hardware device to stop unwanted access and threats to the Controller Area Network (CAN) for the vehicle. The TGWM does not contain any drivers and therefore does not directly operate or control any vehicle components.
The TGWM serves as the information bridge between the radio and the Trailer Surround View Camera Module (STIM) on a trailer, if equipped, through the 12-terminal trailer connector. Hardware security features of the TGWM are used to prevent unauthorized bus network access.
The TGWM is flash programmable. Failure to flash a newly installed TGWM will leave it in a locked mode. When in the locked mode, the TGWM will not operate and the STIM will not be able to communicate with the radio.
OPERATION
The Trailer Surround System uses multiple cameras, the STIM and TGWM to provide real-time visualization of the trailer bird's eye view and selectable views of front, rear, left and right to the radio screen.
The TGWM communicates over CAN-C.
The TGWM, located on the CAN architecture between the STIM and all other vehicle CAN modules, prevents any threat to the CAN bus systems through the STIM access point. A secure connection must be present to allow authentication between the TGWM and the STIM. The TGWM is capable of waking up with a ACC / RUN / START sense input changing state from OFF to ACC, RUN or START . The STIM receives Low Voltage Differential Signal (LVDS) data from each of the four cameras on the trailer, processes that data and broadcasts it on the CAN-IHS data bus for use by the radio and any other modules that need the input. The TGWM continuously monitors the CAN-IHS for messages from the STIM. However, when the STIM is disconnected from the 12-way connector, the TGWM ignores the loss of communication and will not set a Diagnostic Trouble Code (DTC) when the STIM stops communicating with the TGWM.
For additional information regarding the description and operation of the vehicle communication. Refer to COMMUNICATION, DESCRIPTION .
For additional information regarding the TGWM DTC information. Refer to TRAILER CAN GATEWAY MODULE (TCGWM), DIAGNOSTIC CODE INDEX .
For additional information regarding the communication diagnostics of the TGWM. Refer to COMMUNICATION - NON-DTC BASED DIAGNOSTICS .
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.