ERA Glonass Two Button Assembly

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

The two button assembly may be part of the rear view mirror, or a separate, stand alone unit. The button assembly is comprised of 2 buttons and one status LED. The buttons are defined as follows:

The "SOS" button, when pressed allows the user to start a manual emergency call.
The TEST button, which has two functions. First it allows the user to cancel an emergency call before the call has been established with the call center. Second, if pressed longer than 4 seconds allows the user to enter the system test mode.

When pressed, each button completes a circuit across a resistor allowing a specific voltage to be returned to the telematics communication interface control module on the keypad signal circuit. Depending on the voltage range returned the module is able to identify which button has been pressed.

The status LED is located near the buttons on the button assembly. The LED is green when the system is ON and operating normally. When the LED is red, this indicates a system malfunction is present. When the LED is illuminated and flashing, it is an indication that a call is in progress. In the event there is a malfunction and the system is still able to make a call, the LED will flash red during the call however, the call functionally might be limited related to the issue that is present. During night mode the module provides a PWM signal to dim the brightness of the LED.

When the "SOS" button is pressed the LED will start blinking green and a voice prompt will instruct the customer to either press the "SOS" button again to continue with the emergency call, or press the "TEST" button to cancel. If the user does not press either of the buttons in a certain amount of time the module will go back into standby mode and inform the customer via a voice prompt.

In the case of a callback from the call center the LED will be solid red or green. A solid red LED indicates an emergency call related DTC has been set by the telematics communication interface control module, otherwise the LED will be solid green.

After a call to the call center the module will stay in callback mode for 20 minutes with the ignition ON of OFF and the LED will be on solid during this time. After 20 minutes there will be a voice prompt and the LED will turn off. After that the module will stay registered to the network for an additional 100 minutes.