ERA Glonass Test Mode

WARNING: This page is about a different car, the 2018 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

After entering Test Mode the telematics communication interface control module will test the functionally of the keypad, LED indicator, microphone, and audio. At the end of Test Mode the module will send a Minimum Set of Data (MSD) message to the call center.

The MSD message contains control data, vehicle information, direction, position and time. When an emergency call is connected to the call center the MSD message is sent by in-band transmission by default. In the event in-band transmission is unsuccessful, Short Message Service (SMS) will be used as a backup.

To enter the Test Mode turn ignition ON and make sure the vehicle has not moved for at least 1 minute, then press and hold the TEST button for longer than 4 seconds. A series of voice prompts will instruct the user to perform certain functions. At the end of Test Mode one of two messages will be played, TEST OK or Emergency Call System Test Indicates a Failure.