U1900CAN Communication Bus Fault - Receive ErrorABS ModuleREFER to Section 418-00 .U1900CAN Communication Bus Fault - Receive ErrorInstrument ClusterREFER to Section 418-00 .U1900CAN Communication Bus Fault - Receive ErrorTBC ModuleREFER to Section 418-00 .
Your best bet , have a qualified technician diagnose it .
Communications NetworkVehicle communication utilizes a high speed controller area network (HS-CAN), International Standards Organization (ISO) 9141 network and universal asynchronous receiver-transmitter (UART)-based protocol (UBP) network. Information is sent to and from individual control modules that each control specific functions. All 3 networks are connected to the data link connector (DLC). The DLC can be found under the instrument panel between the steering column and the audio unit.
The 3 module communication networks are:
- High speed (HS) CAN
- ISO 9141
- UBP
ISO 9141 is for diagnostic use only while UBP and CAN allow multiple modules to communicate, or transfer data, with each other on a common network.
Module NameNetwork TypeTermination ModuleAnti-lock brake system (ABS) moduleHS-CANNoElectronic automatic temperature control (EATC) module (if equipped)UBPN/AInstrument cluster (gateway module)HS-CAN and UBPYesParking aid module (PAM) (if equipped)ISO 9141N/APowertrain control module (PCM)HS-CANYesRestraints control module (RCM)ISO 9141N/ATrailer brake control (TBC) module (if equipped)HS-CANNoVehicle security module (VSM) (if equipped)UBPN/AFour wheel drive (4WD) control module (if equipped)ISO 9141N/A
ISO 9141 Network Operation
The ISO 9141 communication network is a single wire network, used for diagnostic purposes only.
The ISO 9141 communication network is used for the following modules:
- Parking aid module
- RCM
- 4WD control module
UART-Based Protocol (UBP) Communication Network
The UBP communication network is a single wire network. In addition to scan tool communication, this network allows sharing of information between all modules on the network.
The UBP communication network is used for the following modules:
- EATC
- Instrument cluster
- Vehicle security module
HS-CAN Network Operation
The HS-CAN network uses an unshielded twisted pair cable, data bus (+) and data bus (-) circuits. In addition to scan tool communication, this network allows sharing of information between all modules on the network.
The HS-CAN is a high speed communication network used for the following modules:
- ABS module
- Instrument cluster
- PCM
- Trailer brake control module
Network Termination
The CAN network uses a network termination circuit to improve communication reliability. The network termination of the CAN bus takes place inside the termination modules by termination resistors. Termination modules are located at either end of the bus network. As network messages are broadcast, in the form of voltage signals, the network voltage signals are stabilized by the termination resistors. Each termination module has a 120 ohm resistor across the positive and negative bus connection in the termination module. With two termination modules on each network, and the 120 ohm resistors located in a parallel circuit configuration, the total network impedance, or total resistance is 60 ohms.
Network termination improves bus message reliability by:
- stabilizing bus voltage.
- eliminating electrical interference.
Gateway Module
The instrument cluster is the gateway module, translating HS-CAN to MS-CAN and vice versa. This information allows a message to be distributed throughout both networks. The instrument cluster is the only module on this vehicle that has this ability.
All you need to do is find out which module isn't communicating
Communication Network Diagnostic Trouble Codes (DTC) Index NOTE: DTC U1900 will set in a module that is reporting a communication fault from another module on the data bus. The module that reports the fault is not the problem module.DTCDescriptionSourceActionU0073Control Module Communication Buss OffABS moduleDTC U0073 indicates the module could not communicate on the network at a point in time. The fault is not currently present. CLEAR the DTC. REPEAT the network test with scan tool.U0073Control Module Communication Buss OffInstrument clusterDTC U0073 indicates the module could not communicate on the network at a point in time. The fault is not currently present. CLEAR the DTC. REPEAT the network test with can tool.U1900CAN Communication Bus Fault-Recieve ErrorABS moduleFor module that failed network test, GO to Symptom Chart .U1900CAN Communication Bus Fault-Recieve ErrorInstrument clusterFor module that failed network test, GO to Symptom Chart .U1900CAN Communication Bus Fault-Receive ErrorTBC moduleFor module that failed network test, GO to Symptom Chart .U1950UBP Communication Bus FaultVehicle security moduleFor module that failed network test, GO to Symptom Chart .U2023Fault Received From External NodeInstrument clusterRETRIEVE and FOLLOW non-network DTCs from other modules. REFER to Section 419-10 .U2226UBP Invalid Data From Node ID $10 (PCM)Vehicle security moduleRETRIEVE and FOLLOW non-network DTCs from the PCM. REFER to Powertrain Control/Emissions Diagnosis (PC/ED) manual.All other DTCs--REFER to Section 419-10 .
