Universal Asynchronous Receiver-Transmitter (UART)-Based Protocol (UBP) Communication Network
WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
The UBP communication network is a single circuit communications network, circuit 1906 (VT). The UBP communications network does not function if the wire is shorted to ground or voltage. The UBP communication network allows intermodule communication. The UBP network operates at a maximum data transfer speed of 9.6 Kbps. The UBP network circuit is regulated to approximately 12.0 volts during neutral or rested network traffic. This voltage is reduced proportional to the volume of bus messages sent.
The following modules are on the UBP network:
- Instrument cluster
- Vehicle security module (VSM)
- Electronic automatic temperature control (EATC) module (if equipped)
- Driver seat module (DSM) (if equipped)
The following fault chart describes the specific UBP network failures and their resulting symptom:
UBP NETWORK COMMUNICATION FAULT CHART
| Failure Description | Symptom |
|---|---|
| UBP circuit open | No communication |
| UBP circuit short to voltage | No communication |
| UBP circuit short to ground | No communication |
| Module loss of voltage or ground | No communication |
| Module internal failure | No communication |
The following chart describes all network messages broadcast on HS-CAN, SCP and UBP by each module, and the module(s) that receive the message:
NETWORK MODULE COMMUNICATION MESSAGE CHART
| Broadcast Message | Originating Module | Network Type | Receiving Module(s) |
|---|---|---|---|
| ABS event in progress | Anti-lock brake system (ABS) module | HS-CAN |
|
| ABS malfunction indicator request | ABS module | HS-CAN |
|
| A/C clutch request | Electronic automatic temperature control (EATC) module | UBP |
|
| A/C clutch request (gateway) | Instrument cluster | HS-CAN |
|
| A/C clutch status | PCM | HS-CAN |
|
| A/C clutch status (gateway) | Instrument cluster | UBP |
|
| Accelerator pedal position | PCM | HS-CAN |
|
| Ambient temperature | Instrument cluster | UBP |
|
| Autolamp delay command | Instrument cluster | UBP |
|
| Autolamp delay status | VSM | UBP |
|
| Autolock command | Instrument cluster | UBP |
|
| Autolock status | VSM | UBP |
|
| Barometric pressure | PCM | HS-CAN |
|
| Barometric pressure (gateway) | Instrument cluster | UBP |
|
| Brake malfunction indicator request | ABS module | HS-CAN |
|
| Brake switch status | ABS module | HS-CAN |
|
| Brake switch status | PCM | HS-CAN |
|
| Brake switch status (gateway) | Instrument cluster | UBP |
|
| Charging system status | PCM | HS-CAN |
|
| Clutch pedal position | PCM | HS-CAN |
|
| Door ajar status | VSM | UBP |
|
| Engine coolant temperature | PCM | HS-CAN |
|
| Engine coolant temperature (gateway) | Instrument cluster | UBP |
|
| Engine fail-safe cooling mode status | PCM | HS-CAN |
|
| Engine fail-safe electronic throttle control (ETC) mode status | PCM | HS-CAN |
|
| Engine fuel consumption data | PCM | HS-CAN |
|
| Engine malfunction indicator lamp (MIL) request | PCM | HS-CAN |
|
| Engine off timer | PCM | HS-CAN |
|
| Engine off timer (gateway) | Instrument cluster | UBP |
|
| Engine RPM | PCM | HS-CAN |
|
| Engine torque data | ABS module | HS-CAN |
|
| English/Metric display | Instrument cluster | UBP |
|
| Fuel cap off indicator request | PCM | HS-CAN |
|
| Fuel level input status (instant) | Instrument cluster | HS-CAN |
|
| Hazard lamp status | Instrument cluster | UBP |
|
| Ignition switch position | Instrument cluster | HS-CAN |
|
| Key fob button status | VSM | UBP |
|
| Keypad button status | VSM | UBP |
|
| Key-in-ignition status | Instrument cluster | UBP |
|
| Odometer count | PCM | HS-CAN |
|
| Parking brake status | Instrument cluster | HS-CAN |
|
| PCM VIN information | PCM | HS-CAN |
|
| Speed control indicator request | PCM | HS-CAN |
|
| Speed control deactivate switch status | PCM | HS-CAN |
|
| Tire pressure monitoring system (TPMS) status | VSM | UBP |
|
| Tire size information | ABS module | HS-CAN |
|
| Transmission overdrive indicator status | PCM | HS-CAN |
|
| Transmission selector (PRNDL) range | PCM | HS-CAN |
|
| Transmission selector (PRNDL) range (gateway) | Instrument cluster | UBP |
|
| Transmission type | PCM | HS-CAN |
|
| Vehicle speed | PCM | HS-CAN |
|
| Vehicle speed (gateway) | Instrument cluster | UBP |
|
| Wheel speed output (RF, LF, RR, LR) | ABS module | HS-CAN |
|
| Wheel speed front, average | ABS module | HS-CAN |
|
| Wheel speed rear, average | ABS module | HS-CAN |
|
| 4WD coupling mode and status | 4WD control module | HS-CAN |
|
| 4WD high indicator request | 4WD control module | HS-CAN |
|
| 4WD low indicator request | 4WD control module | HS-CAN |
|