Low Speed GMLAN Circuit Description
| Callout | Component Name |
|---|---|
| UQS | SPEAKER SYSTEM: PREMIUM AUDIO BRANDED WITH SURROUND AMPLIFIER |
| UEU | SENSOR INDICATOR: FORWARD COLLISION ALERT |
| UFL | LANE ACTIVE SAFETY: DEPARTURE WARNING |
| UD7 | PARK ASSIST: REAR |
| BTM | SWITCH: ENGINE START, KEYLESS |
| ATH | LOCK CONTROL, ENTRY: REMOTE ENTRY, EXTENDED RANGE, PASSIVE ENTRY, ALL DOORS |
| CW1 | COUNTRY: KOREA |
| CZ2 | COUNTRY: CHINA |
| UFG | SENSOR INDICATOR: REAR CROSS TRAFFIC ALERT |
| UFT | SIDE ACTIVE SAFETY: OBSTACLE DETECTION |
| A45 | MEMORY: SEAT ADJUSTER, MIRROR, POWER, DRIVER, PERSONALIZATION |
| KA1 | HEATER SEAT FRT: DRVR and PASS |
| UE1 | COMMUNICATION SYSTEM: VEHICLE, ONSTAR |
| UWG | ENTERTAINMENT PKG: RR SEAT, DUAL DISPLAY, REM CONTROL, AUX JACK, 2 WIRELESS DUAL CHANNEL HEADPHONES |
| UWJ | ENTERTAINMENT PKG: RR SEAT, DUAL DISPLAY, REM CONTROL, AUX JACK |
| T3 | T3 Audio Amplifier |
| K109 | K109 Frontview Camera Module |
| K41R | K41R Rear Parking Assist Control Module |
| K84 | K84 Keyless Entry Control Module |
| K85 | K85 Passenger Presence Module |
| A13 | A13 Rear Audio Control Module |
| B218L | B218L Side Object Sensor Module - Left |
| K40 | K40 Seat Memory Control Module |
| K73 | K73 Telematics Communication Interface Control Module |
| X84 | X84 Data Link Connector |
| S136 | S136 Infotainment Control Touchpad |
| K33 | K33 HVAC Control Module |
| A11 | A11 Radio |
| P16 | P16 Instrument Cluster |
| P17 | P17 Info Display Module |
| A26 | A26 HVAC Controls |
| K9 | K9 Body Control Module |
| A33 | A33 Media Disc Player |
| K36 | K36 Inflatable Restraint Sensing and Diagnostic Module |
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.