Low Speed GMLAN Circuit Description
| Callout | Component Name |
|---|---|
| IO6 | RADIO: INFOTAINMENT SYSTEM - UPLEVEL HMI, ENHANCED CONNECTIVITY, EMBEDDED NAVIGATION |
| UE1 | COMMUNICATION SYSTEM: VEHICLE, ONSTAR |
| V2S | TRAILER PROVISIONS: WIRING HARNESS |
| UGN | COLL IMMINENT BRK: VEHICLE FORWARD MOVEMENT, BRAKE PREFILL and INTELLIGENT BRAKE ASSIST |
| UVZ | SENSOR: COLLISION AVOIDANCE and MITIGATION, VEHICLE REVERSE MOVEMENT |
| A45 | MEMORY: SEAT ADJUSTER, MIRROR, POWER, DRIVER, PERSONALIZATION |
| UD5 | PARK ASSIST: FRONT AND REAR |
| UD7 | PARK ASSIST: REAR |
| UFT | SIDE ACTIVE SAFETY: OBSTACLE DETECTION |
| ULS | STEERING COLUMN LOCK: MECHANICAL |
| UFL | LANE ACTIVE SAFETY: DEPARTURE WARNING |
| UGN | COLL IMMINENT BRK: VEHICLE FORWARD MOVEMENT, BRAKE PREFILL and INTELLIGENT BRAKE ASSIST |
| K31 | K31 Navigation Control Module |
| K73 | K73 Telematics Communication Interface Control Module |
| K68 | K68 Trailer Lighting Control Module |
| K9 | K9 Body Control Module |
| K84 | K84 Keyless Entry Control Module |
| T3 | T3 Audio Amplifier |
| K124 | Active Safety Control Module |
| K40D | K40D Seat Memory Control Module - Driver |
| K85 | Passenger Presence Module |
| K41 | K41 Front and Rear Parking Assist Control Module |
| B94L | B94L Side Object Sensor - Left |
| X84 | X84 Data Link Connector |
| P16 | P16 Instrument Cluster |
| K33 | K33 HVAC Control Module |
| K109 | K109 Frontview Camera Module |
| A11 | A11 Radio |
| P17 | P17 Info Display Module |
| K60 | K60 Steering Column Lock Module |
| K36 | K36 Inflatable Restraint Sensing and Diagnostic Module |
| B218R | B218R Side Object Sensor Module - Right |
Low Speed GMLAN Bus is used in applications where a high data rate is not required which allows for the use of less complex components. It is typically used for operator controlled functions where the response time requirements are slower than those required for dynamic vehicle control.
The Low Speed GMLAN Serial Data Network consists of a single wire, ground referenced bus with high side voltage drive. During on road vehicle operation data symbols (1's and 0's) are transmitted sequentially at the normal rate of 33.3 Kbit/s. For component programming only, a special high speed data mode of 83.3 Kbit/s may be used.
Unlike the high speed dual wire networks, the single wire low speed network does not use terminating resistors at either end of the network.
The data symbols to be transmitted over the bus are represented by different voltage signals on the bus. When the Low Speed GMLAN Bus is at rest and is not being driven, there is a low signal voltage of approximately 0.2 V. This represents a logic "1". When a logic "0" is to be transmitted, the signal voltage is driven higher to around 4.0 V or higher.