Block Diagram
CAN abbreviations
| 30 | Battery positive (terminal 30) | A162 | Microphone |
|---|---|---|---|
| 31 | Ground (terminal 31) | B157 | Additional receiver (optional) |
| A65 | Airbag control unit SDM | W446 | Antenna amplifier |
Function Table
Wiring harness plug X1 = 32-pin
Wiring harness plug X2 = telephone antenna
| Terminal | Description | Source | Destination |
|---|---|---|---|
| X1-1 | Microphone signal line | A162 | TMS |
| X1-2 | Microphone screening | TMS | - |
| X1-3 | Additional receiver (optional) Loudspeaker signal line | TMS | B157 |
| X1-4 | Audio signal | TMS | NHU |
| X1-5 | Audio signal | TMS | NHU |
| X1-11 X1-27 CAN | Diagnosis information | DIAG TMS | TMS DIAG |
| X1-11 X1-27 CAN | Key actuation on keypad Audio data | NHU | TMS |
| X1-11 X1-27 CAN | Messages for communication with display Airbag and seat belt information | DIS | TMS |
| X1-11 X1-27 CAN | Key actuation on keypad | ECC | TMS |
| X1-11 X1-27 CAN | Messages for communication with display | TMS | DIS |
| X1-11 X1-27 CAN | Audio data | TMS | NHU |
| X1-15 | Battery positive (terminal 30) | IPBEC | TMS |
| X1-16 | Battery positive (terminal 30) | IPBEC | TMS |
| X1-17 | Microphone signal line | A162 | TMS |
| X1-18 | Additional receiver (optional) Microphone signal line | B157 | TMS |
| X1-19 | Additional receiver (optional) Signal lead screening | TMS | B157 |
| X1-20 | Additional receiver (optional) Voltage supply | TMS | B157 |
| X1-21 | Additional receiver (optional) Receiver picked up | B15 | TMS |
| X1-25 | Safety system signal line triggered | A65 | TMS |
| X1-26 | Diagnostic lead (KW82) | DIAG | TMS |
| X1-31 | Ground (terminal 31) | Ground | TMS |
| X1-32 | Ground (terminal 31) | Ground | TMS |
| X2-1 | Telephone antenna signal line | W446 | TMS |
Functional Description
In an emergency, the telematics system transmits an emergency call to the Onstar call centre.
When a safety system is triggered, the airbag control unit transmits a signal to the telematics system, which then starts the emergency call.
In order to manually trigger the emergency call, the telematics system is provided with 3 operating buttons. One on the front of the telematics system, an optionally configurable service button and a directly wired SOS button on the front of the audio system NCDC 2015.
When the emergency call has been transmitted, it is possible to communicate with he call centre via the interior loudspeaker and an external microphone, which is also used as telephone hands-free device.