System Diagram
| Module Name | Network Type | Termination Module |
|---|---|---|
| ABS module | HS-CAN | No |
| Accessory Protocol Interface Module (APIM) | HS-CAN | No |
| I-CAN | No | |
| Accessory Protocol Interface Module (APIM) (8-inch touchscreen) (if equipped) | HS-CAN | No |
| MS-CAN | No | |
| I-CAN | No | |
| Audio Front Control Module (ACM) | I-CAN | Yes |
| Audio Digital Signal Processing (DSP) module (if equipped) | I-CAN | No |
| Body Control Module (BCM) | HS-CAN | Yes |
| MS-CAN | Yes | |
| HVAC module | MS-CAN | No |
| Driver Door Module (DDM) (if equipped) | MS-CAN | No |
| Driver Seat Module (DSM) (if equipped) | MS-CAN | No |
| Front Controls Interface Module (FCIM) | I-CAN | No |
| Front Control/Display Interface Module (FCDIM) | I-CAN | No |
| Global Positioning System Module (GPSM) (if equipped) | MS-CAN | No |
| Headlamp Control Module (HCM) (if equipped) | MS-CAN | No |
| Image Processing Module - B (IPM-B) (if equipped) | MS-CAN | No |
| Instrument Panel Cluster (IPC) (gateway module) | MS-CAN | Yes |
| I-CAN | Yes | |
| Liftgate/Trunk Module (LTM) | MS-CAN | No |
| Occupant Classification System Module (OCSM) | HS-CAN | No |
| Parking Aid Module (PAM) (if equipped) | HS-CAN | No |
| Passenger Door Module (PDM) | MS-CAN | No |
| PCM | HS-CAN | Yes |
| Power Steering Control Module (PSCM) | HS-CAN | No |
| Remote Function Actuator (RFA) module (if equipped) | MS-CAN | No |
| Restraints Control Module (RCM) | HS-CAN | No |
| Steering Angle Sensor Module (SASM) | HS-CAN | No |
| Side Obstacle Detection Control Module - Left (SOD-L) (if equipped) | MS-CAN | No |
| Side Obstacle Detection Control Module - Right (SOD-R) (if equipped) | MS-CAN | No |
| Trailer Module (TRM) (if equipped) | MS-CAN | No |
MODULE NETWORK CHART
Network Termination
The Controller Area Network (CAN) uses network termination to improve communication reliability. Termination modules are located at both ends of the 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 an internal 120 ohm resistor that bridges across the positive and negative bus connection. With two 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 Body Control Module (BCM) and Instrument Panel Cluster (IPC) are the gateway modules.
The BCM translates messages on the HS-CAN to the MS-CAN and vice versa. The IPC translates messages on the MS-CAN to the I-CAN and vice versa.
This allows a message to be distributed through all three networks. The BCM and IPC are the only modules on this vehicle that have this ability.
High Speed Controller Area Network (HS-CAN)
The HS-CAN operates at a maximum data transfer speed of 500 Kbps and is designed for real time powertrain information transfer and control.
Modules on the HS-CAN communicate using bussed messages. The HS-CAN uses an unshielded twisted pair cable, data bus (+) and data bus (-) circuits. In addition to scan tool communication, the HS-CAN allows sharing of information between all modules on the network.
Medium Speed Controller Area Network (MS-CAN)
The MS-CAN operates at a maximum data transfer speed of 125 Kbps and is designed for general information transfer.
Modules on the MS-CAN communicate using bussed messages. The MS-CAN uses an unshielded twisted pair cable, data bus (+) and data bus (-) circuits. In addition to scan tool communication, the MS-CAN allows sharing of information between all modules on the network.
Infotainment Controller Area Network (I-CAN)
The I-CAN operates at a maximum data transfer speed of 500 Kbps and is designed for real time audio and multimedia information transfer and control.
Modules on the I-CAN communicate using bussed messages. I-CAN uses an unshielded twisted pair cable, data bus (+) and data bus (-) circuits. The I-CAN allows sharing of information between all modules on the network.
The IPC is used as a gateway module for the messages to transfer between the scan tool and the modules on the I-CAN.
Controller Area Network (CAN) Fault Tolerance
Note. The oscilloscope traces below are from the Integrated Diagnostic System (IDS) oscilloscope taken using the IDS pre-configured CAN settings. The traces are for both data (+) and data (-) taken simultaneously (2-channel) at a sample rate of 1 mega-sample per second (1MS/s) or greater.
Traces below are viewed at 500mV per division (vertical axis) and 20 microseconds (20μs) per division (horizontal axis). Readings taken with a different oscilloscope vary from those shown in illustration. Compare any suspect readings to a known good vehicle.
CAN Circuits Shorted Together
In the event that the data (+) and data (-) circuits become shorted together, the signal stays at base voltage (2.5V) continuously and all communication capabilities are lost.
CAN (+) Circuit Shorted To Ground
In the event that the data (+) circuit becomes shorted to ground, both the data (+) and data (-) circuits are pulled low (0V) and all communication capabilities are lost.
CAN (-) Circuit Shorted To Ground
In the event that the data (-) circuit becomes shorted to ground, the data (-) circuit is pulled low (0V) and the data (+) circuit reaches near-normal peak voltage (3.0V) during communication but falls to 0V instead of normal base voltage (2.5V). Communication may continue but at a degraded level.
CAN (+) Circuit Shorted To Battery Voltage
In the event that the data (+) circuit becomes shorted to battery voltage, the data (+) circuit is pulled high (12V) and the data (-) circuit falls to abnormally high voltage (above 5V) during communication and reaches battery voltage (12V) for peak voltage. Communication may continue but at a degraded level.
CAN (-) Circuit Shorted To Battery Voltage
In the event that the data (-) circuit becomes shorted to battery voltage, both the data (+) and data (-) circuits are pulled high (12V) and all communication capabilities are lost.
CAN Circuit Signal Corruption
Rhythmic oscillations, inductive spikes or random interference can disrupt the network communications. The corruption signal source may be outside electrical interference such as motors or solenoids or internal interference generated from a module on the network. In some cases, an open in either the data (+) or data (-) circuit to a network module may cause the module to emit interference on the one circuit which is still connected. The trace shown in illustration is an example of a "sawtooth" pattern transmitted from a module with one open network circuit.
Other corruptions may be present when a module is intermittently powered up and down. The module on power up may initiate communication out of sync with other modules on the network causing momentary communication outages.
Controller Area Network (CAN) Multiplex Messages
Modules on the CAN utilize simultaneous communication of 2 or more messages on the same network circuits. The following chart summarizes the messages sent and received on the network.
Note. This chart describes the specific HS-CAN, MS-CAN and I-CAN messages broadcast by each module, and the module(s) that receive the message.
| Broadcast Message | Originating Module | Network Type | Receiving Module(s) |
|---|---|---|---|
| A/C request | BCM | HS-CAN | PCM |
| ABS module active | ABS module | HS-CAN | PCM PAM PSCM RCM |
| ABS module warning indicator request | BCM | MS-CAN | IPC |
| Accelerator pedal position | PCM | HS-CAN | ABS module BCM HCM OCSM RCM |
| Accelerator pedal position (gateway) | BCM | MS-CAN | HVAC module IPC |
| ACM CD data | ACM | I-CAN | FCDIM APIM IPC |
| ACM configuration | ACM | I-CAN | IPC APIM FCDIM Audio DSP module |
| ACM configuration (gateway) | IPC | MS-CAN | BCM |
| ACM configuration (gateway) | BCM | HS-CAN | PAM |
| ACM radio function | ACM | I-CAN | FCDIM APIM IPC |
| ACM status | ACM | I-CAN | IPC FCDIM Audio DSP module APIM |
| Air ambient temperature | PCM | HS-CAN | BCM HCM PAM |
| Air ambient temperature (gateway) | BCM | MS-CAN | IPC HVAC module |
| Air ambient temperature filtered actual | BCM | MS-CAN | IPC DDM PDM LTM |
| Air bag deployment status | RCM | HS-CAN | APIM |
| Air bag indicator status | IPC | MS-CAN | BCM |
| Air bag warning indicator status | BCM | HS-CAN | RCM |
| Ambient light level | BCM | MS-CAN | IPC |
| Ambient light setting | BCM | MS-CAN | IPC |
| Audio mute request | BCM | MS-CAN | IPC |
| Audio button status | FCIM | I-CAN | APIM |
| Audio button status | FCDIM | I-CAN | APIM |
| Audio display request mode | FCDIM | I-CAN | APIM |
| Audio mode and setting request | FCDIM | I-CAN | ACM |
| Audio settings | ACM | I-CAN | APIM |
| Audio source request | ACM | I-CAN | IPC FCDIM Audio DSP module APIM |
| Audio source select | FCDIM | I-CAN | APIM |
| Audio status | APIM | I-CAN | FCDIM |
| Audio volume and mode status | Audio DSP module | I-CAN | APIM FCDIM |
| Audio volume command | Audio DSP module | I-CAN | APIM FCDIM |
| AWD service required display | BCM | MS-CAN | IPC |
| AWD status | BCM | MS-CAN | IPC |
| AWD service required | PCM | HS-CAN | BCM RCM |
| AWD service required (gateway) | BCM | MS-CAN | IPC |
| AWD status | PCM | HS-CAN | BCM ABS module |
| AWD lock torque data | PCM | HS-CAN | BCM |
| AWD lock torque data (gateway) | BCM | MS-CAN | IPC |
| AWD wheel torque data | PCM | HS-CAN | BCM ABS module |
| AWD wheel torque data (gateway) | BCM | MS-CAN | IPC |
| Battery charge indicator | BCM | MS-CAN | IPC |
| Battery current | BCM | HS-CAN | PCM |
| Battery state of charge | IPC | I-CAN | APIM FCDIM |
| Beltminder status | IPC | I-CAN | ACM Audio DSP module |
| Beltminder audio status | Audio DSP module | I-CAN | APIM FCDIM |
| Bezel test status | FCIM | I-CAN | APIM |
| Bezel test status | Audio DSP module | I-CAN | APIM FCDIM |
| Bezel test request | FCDIM | I-CAN | ACM Audio DSP module |
| BLIS® alert | BCM | MS-CAN | DDM PDM |
| BLIS® system status | BCM | MS-CAN | IPC |
| BLIS® status, driver side | DDM | MS-CAN | BCM |
| BLIS® status, driver side | BCM | MS-CAN | IPC |
| BLIS® status, passenger side | PDM | MS-CAN | BCM |
| BLIS® status, passenger side | BCM | MS-CAN | IPC |
| Brake fluid level low | BCM | MS-CAN | IPC |
| Brake On/Off switch | PCM | HS-CAN | OCSM ABS module HCM BCM RCM |
| Brake pedal applied | PCM | HS-CAN | BCM |
| Brake (red) warning indicator request | BCM | MS-CAN | IPC |
| Bulb failure indication | BCM | MS-CAN | IPC |
| Call data | APIM | I-CAN | FCDIM |
| Camera commands | FCDIM | I-CAN | IPC |
| Camera commands (gateway) | IPC | MS-CAN | IPM-B |
| Camera status display | BCM | MS-CAN | IPC |
| Camera status | IPM-B | MS-CAN | IPC |
| Car mode | BCM | MS-CAN | DDM PDM HVAC module IPC RFA module LTM TRM |
| CD changer data | FCDIM | I-CAN | ACM |
| CD load/eject | FCDIM | I-CAN | ACM |
| Central lock status | BCM | MS-CAN | RFA module DDM IPC LTM |
| Charge voltage request | BCM | HS-CAN | PCM |
| Charging system indicator request | BCM | MS-CAN | IPC |
| Child lock command | BCM | MS-CAN | DDM PDM |
| Chime request | IPC | I-CAN | ACM Audio DSP module |
| Chime request | ACM | I-CAN | Audio DSP module |
| Climate control requests | IPC | MS-CAN | HVAC module |
| Climate control status | HVAC module | MS-CAN | IPC |
| Climate control status (gateway) | IPC | I-CAN | FCDIM APIM |
| Cruise control setting | PCM | HS-CAN | BCM |
| Climate control remote start requests | HVAC module | MS-CAN | IPC |
| Cross traffic command | IPC | MS-CAN | BCM |
| Cross traffic status | BCM | MS-CAN | IPC |
| Cruise control status (gateway) | BCM | MS-CAN | IPC |
| Date and time | IPC | I-CAN | APIM FCDIM |
| Date and time adjustment request | FCDIM | I-CAN | IPC |
| Date and time adjustment request (gateway) | IPC | MS-CAN | BCM |
| Day/night status | IPC | I-CAN | APIM FCIM |
| Defrost request | HVAC module | MS-CAN | BCM |
| Dimmer switch position | BCM | MS-CAN | IPC |
| Display language request | FCDIM | I-CAN | IPC |
| Display set volume request | FCDIM | I-CAN | ACM Audio DSP module |
| Door ajar status | IPC | I-CAN | FCDIM APIM |
| Door lock status | IPC | I-CAN | FCDIM APIM |
| Door lock status request | BCM | MS-CAN | DDM PDM |
| Door status | BCM | MS-CAN | RFA module DDM LTM |
| Door ajar status | BCM | HS-CAN | ABS module |
| Driver safety belt status | RCM | HS-CAN | BCM PCM |
| Drivers door latch status | DDM | MS-CAN | BCM |
| Drivers window position | DDM | MS-CAN | BCM HVAC module |
| ECall confirmation | APIM | HS-CAN | RCM BCM |
| ECall notification | RCM | HS-CAN | APIM |
| Econometer data | PCM | HS-CAN | BCM |
| Econometer data (gateway) | BCM | MS-CAN | IPC |
| EPAS display | BCM | MS-CAN | IPC |
| Emergency braking event | ABS module | HS-CAN | BCM |
| Engine coolant temperature | PCM | HS-CAN | BCM |
| Engine coolant temperature (gateway) | BCM | MS-CAN | IPC HVAC module |
| Engine coolant temperature fault reporting | BCM | MS-CAN | IPC |
| Engine oil life reset | IPC | MS-CAN | BCM |
| Engine oil life reset (gateway) | BCM | HS-CAN | PCM |
| Engine RPM | PCM | HS-CAN | BCM ABS module |
| Engine RPM (gateway) | BCM | MS-CAN | IPC HVAC module HCM |
| Engine service indication | PCM | HS-CAN | BCM |
| Engine service indication (gateway) | BCM | MS-CAN | IPC |
| Engine state | PCM | HS-CAN | BCM |
| Evaporator temperature setting | HVAC module | MS-CAN | BCM |
| English/metric equivalent | BCM | HS-CAN | PCM |
| Exterior light switch position | BCM | HS-CAN | HCM |
| FCIM button state | FCIM | I-CAN | ACM APIM Audio DSP module |
| FCIM button status | FCIM | I-CAN | APIM |
| FCDIM configuration | FCDIM | I-CAN | ACM |
| Fog lamp indicator request | BCM | MS-CAN | IPC |
| Front passenger safety belt buckle status | RCM | HS-CAN | OCSM BCM |
| Front washer command | BCM | MS-CAN | IPC HVAC module |
| Fuel level status | BCM | HS-CAN | PCM |
| Fuel level status | BCM | MS-CAN | IPC |
| Fuel level status (gateway) | IPC | I-CAN | APIM |
| Fuel pump cutoff request | RCM | HS-CAN | BCM |
| Fuel pump ON/OFF | PCM | HS-CAN | BCM |
| Gear lever position | IPC | I-CAN | ACM APIM Audio DSP module FCDIM |
| GPS data | GPSM | MS-CAN | IPC APIM |
| Headlamp control status | HCM | HS-CAN | BCM |
| Headlamp control status (gateway) | BCM | MS-CAN | IPC |
| High beam indicator request | BCM | MS-CAN | IPC |
| Hill start assist status | ABS module | HS-CAN | PCM |
| Home safe light indication request | BCM | MS-CAN | IPC |
| Hood ajar status | BCM | HS-CAN | ABS module |
| Ignition key position power mode | IPC | I-CAN | ACM APIM Audio DSP module FCIM FCDIM |
| Ignition key position power mode | BCM | MS-CAN | RFA module DDM PDM DSM IPC TRM IPM-B |
| Ignition key position power mode | BCM | HS-CAN | ABS module PCM HCM PAM PSCM RCM SASM |
| Ignition key type | IPC | MS-CAN | BCM RFA module |
| Ignition key type (gateway) | BCM | HS-CAN | PAM ABS module |
| Ignition status | BCM | MS-CAN | IPC GPSM |
| Ignition status (gateway) | IPC | I-CAN | APIM ACM Audio DSP module FCIM FCDIM |
| Illumination dimming level | IPC | MS-CAN | BCM HVAC module |
| Illumination dimming level | BCM | MS-CAN | IPC DDM PDM IPM-B |
| Illumination dimming level (gateway) | IPC | I-CAN | FCDIM FCIM APIM |
| Illumination dimming level | BCM | HS-CAN | PCM PAM RCM |
| Intelligent access central lock command | RFA module | MS-CAN | BCM LTM |
| Intelligent access indication | BCM | MS-CAN | IPC |
| Intelligent access key status | RFA module | MS-CAN | BCM |
| Intelligent access system status | RFA module | MS-CAN | BCM |
| Key warning indication | BCM | MS-CAN | IPC |
| Language display | IPC | I-CAN | APIM FCDIM |
| Left rear window position | DDM | MS-CAN | BCM HVAC module |
| Liftgate ajar status | BCM | HS-CAN | ABS module |
| Light switch position | BCM | MS-CAN | IPC |
| Load shed level | IPC | I-CAN | APIM |
| Main light switch position | BCM | MS-CAN | IPC |
| Memory seat position | DSM | MS-CAN | DDM PDM IPC |
| MIL request | PCM | HS-CAN | BCM RCM |
| MIL request (gateway) | BCM | MS-CAN | IPC |
| MyKey® Identification | BCM | MS-CAN | IPC |
| MyKey® reset request | BCM | MS-CAN | IPC |
| Mirror position load request | DSM | MS-CAN | DDM PDM |
| Mirror position store request | DSM | MS-CAN | DDM PDM |
| Multifunction display configuration | FCDIM | I-CAN | ACM |
| MyKey® speed limit configuration | BCM | HS-CAN | PCM |
| MyKey® volume limit status | IPC | I-CAN | Audio DSP module ACM |
| MyKey® volume limit mode | ACM | I-CAN | APIM FCDIM |
| MyKey® volume limit status | Audio DSP module | I-CAN | APIM FCDIM |
| Navigation data | IPC | I-CAN | APIM |
| Navigation request | FCDIM | I-CAN | ACM |
| Navigation request audio setting | FCDIM | I-CAN | ACM Audio DSP module |
| Neutral tow status | PCM | HS-CAN | BCM |
| Neutral tow status (gateway) | BCM | MS-CAN | IPC |
| OCS calibration data | OCSM | HS-CAN | RCM |
| OCS fault status | OCSM | HS-CAN | RCM |
| OCS sensor data | OCSM | HS-CAN | RCM |
| OCS serial number | OCSM | HS-CAN | RCM |
| Odometer master value | BCM | HS-CAN | PCM ABS module |
| Odometer master value | IPC | MS-CAN | DDM PDM BCM |
| Oil change indicator | PCM | HS-CAN | BCM |
| Oil pressure warning | PCM | HS-CAN | BCM |
| Oil pressure warning (gateway) | BCM | MS-CAN | IPC |
| Oil change indicator | BCM | MS-CAN | IPC |
| Outer mirror defrost command | BCM | MS-CAN | DDM PDM |
| Outside air temperature status | IPC | I-CAN | APIM Audio DSP module FCIM FCDIM |
| Park brake indication | BCM | MS-CAN | IPC |
| Parking aid active | PAM | HS-CAN | BCM |
| Parking aid active (gateway) | BCM | MS-CAN | IPC IPM-B |
| Parking aid disable status | PAM | HS-CAN | BCM |
| Parking aid disable status (gateway) | BCM | MS-CAN | IPC IPM-B |
| Parking aid range to object | PAM | HS-CAN | BCM |
| Parking aid range to object (gateway) | BCM | MS-CAN | IPC IPM-B |
| Parking aid rear camera settings | IPC | MS-CAN | IPM-B |
| Parking brake actual | BCM | HS-CAN | ABS module PCM |
| PRNDL park position indicator | IPC | MS-CAN | BCM |
| Passenger detect status | BCM | MS-CAN | IPC |
| Passenger mirror command | DDM | MS-CAN | PDM |
| Passenger window command | DDM | MS-CAN | PDM |
| Passenger window position | PDM | MS-CAN | BCM HVAC module |
| Passengers door latch status | PDM | MS-CAN | BCM |
| Passenger door lock request | PDM | MS-CAN | BCM |
| PATS indication | BCM | MS-CAN | IPC |
| Passive key out of vehicle | RFA module | MS-CAN | BCM IPC |
| Passive key sensor confirm | BCM | MS-CAN | RFA module |
| Passive key liftgate status | RFA module | MS-CAN | IPC LTM |
| Passive key status | BCM | MS-CAN | IPC |
| Passive key warning indicator | RFA module | MS-CAN | BCM IPC |
| Passive liftgate release command | LTM | MS-CAN | RFA module |
| Passive liftgate request | BCM | MS-CAN | LTM |
| Position light indication | BCM | MS-CAN | TRM IPC |
| Parking assist distance sensor data | IPC | I-CAN | APIM FCDIM |
| Parking brake warning | IPC | I-CAN | APIM |
| Power pack status | PCM | HS-CAN | BCM ABS module |
| Power system status | BCM | MS-CAN | IPC |
| Puddle lamp activation | BCM | MS-CAN | DDM PDM |
| RCM serial number | RCM | HS-CAN | ABS module |
| Rear defrost status | BCM | MS-CAN | HVAC module |
| Rear door latch status | DDM | MS-CAN | BCM |
| Rear passenger safety belt buckle status | RCM | HS-CAN | BCM |
| Rear window disable command | DDM | MS-CAN | PDM BCM |
| Restraint impact event status | RCM | HS-CAN | BCM OCSM |
| Reverse gear | BCM | MS-CAN | DDM PDM GPSM IPC TRM |
| Remote battery status | BCM | MS-CAN | IPC |
| Remote start command | BCM | MS-CAN | HVAC module |
| RKE lock command (with intelligent access) | RFA module | MS-CAN | BCM DDM PDM |
| RKE settings | BCM | MS-CAN | RFA module |
| RKE data (with intelligent access) | RFA module | MS-CAN | BCM |
| Roll stability control mode | ABS module | HS-CAN | PSCM |
| Safety belt status | BCM | MS-CAN | IPC |
| Rear view camera display settings | FCDIM | I-CAN | IPC |
| Rear view camera status | IPC | I-CAN | APIM FCDIM |
| Satellite radio error status | ACM | I-CAN | APIM FCDIM |
| Satellite radio status | ACM | I-CAN | APIM FCDIM |
| Satellite radio data | ACM | I-CAN | IPC FCDIM APIM |
| Selected display language | APIM | I-CAN | IPC |
| Selected display language (gateway) | IPC | I-CAN | APIM FCDIM |
| Safety belt event status | RCM | HS-CAN | APIM |
| Selector lever (PRNDL) status | BCM | MS-CAN | PDM DDM HVAC module IPC LTM TRM |
| Selector lever (PRNDL) status (gateway) | IPC | I-CAN | APIM ACM Audio DSP module FCDIM |
| Set point volume | FCIM | I-CAN | ACM Audio DSP module |
| Set volume | FCIM | I-CAN | ACM Audio DSP module |
| Stability control brake active | ABS module | HS-CAN | PCM PAM PSCM RCM |
| Stability control mode request | BCM | HS-CAN | ABS module |
| Stability-traction control disabled indicator request | ABS module | HS-CAN | BCM PCM |
| Stability-traction control disabled indicator request (gateway) | BCM | MS-CAN | IPC |
| Stability-traction control indication | ABS module | HS-CAN | BCM RCM |
| Stability-traction control indication (gateway) | BCM | MS-CAN | IPC |
| Stability-traction control disable | IPC | MS-CAN | BCM |
| Start/stop button indicator | PCM | HS-CAN | BCM |
| Start/stop display message | BCM | MS-CAN | IPC |
| Steering angle status | SASM | HS-CAN | PCM ABS BCM HCM PAM PSCM |
| Steering angle status | BCM | MS-CAN | IPM-B |
| Steering angle counter | PAM | HS-CAN | PSCM |
| Steering wheel switch data | IPC | I-CAN | ACM |
| Steering wheel switch data | FCDIM | I-CAN | APIM |
| Stoplamp activation | BCM | MS-CAN | TRM |
| Stoplamp request | ABS module | HS-CAN | BCM |
| SYNC® alerts | APIM | I-CAN | ACM Audio DSP module |
| Temperature display units | APIM | I-CAN | IPC |
| Tire pressure data | RFA module | MS-CAN | BCM |
| Tire pressure data (gateway) | BCM | MS-CAN | IPC |
| Tire pressure data (gateway) | BCM | HS-CAN | APIM |
| Tire pressure indication | BCM | MS-CAN | IPC |
| TPMS command | PCM | MS-CAN | RFA module |
| Torsion bar torque | PSCM | HS-CAN | PAM ABS module |
| Traction control brake active | ABS module | HS-CAN | PCM PSCM RCM |
| Traction control mode | ABS module | HS-CAN | PCM PAM PSCM RCM |
| Trailer lamp connection status | TRM | MS-CAN | BCM IPM-B IPC |
| Trailer lamp connection status (gateway) | BCM | HS-CAN | ABS module PCM PAM |
| Transmission gear display | PCM | HS-CAN | BCM |
| Transmission gear display (gateway) | BCM | MS-CAN | IPC |
| Transmission gear position | PCM | HS-CAN | ABS module |
| Transmission gear lever position | PCM | HS-CAN | ABS module BCM HCM OCSM PAM RCM |
| Transmission in reverse | PCM | HS-CAN | BCM ABS module HCM PAM OCSM PSCM |
| Transmission message request | PCM | HS-CAN | BCM |
| Transmission mode display | PCM | HS-CAN | BCM |
| Transmission mode display (gateway) | BCM | MS-CAN | IPC |
| Trailer lamp check | TRM | MS-CAN | BCM IPC |
| Trailer module connect status | IPC | I-CAN | APIM FCDIM |
| Transmission mode display actual | PCM | HS-CAN | BCM |
| Transmission mode display actual (gateway) | BCM | HS-CAN | IPC |
| Transmission neutral tow mode status | PCM | HS-CAN | BCM |
| Transmission park lock control | BCM | MS-CAN | IPC |
| Transmission service required | PCM | HS-CAN | BCM |
| Transmission service required (gateway) | BCM | MS-CAN | IPC |
| Transmission shift indicator | PCM | HS-CAN | BCM |
| Transmission shift indicator (gateway) | BCM | MS-CAN | IPC |
| Transmission shift mode | PCM | HS-CAN | BCM |
| Transmission shift mode (gateway) | BCM | MS-CAN | IPC |
| Transmission upshift indication request | BCM | MS-CAN | IPC |
| Transmission torque data | PCM | HS-CAN | ABS module |
| Transport mode | BCM | HS-CAN | PSCM PCM PAM ABS module PSCM |
| Transport mode | BCM | MS-CAN | IPC |
| Turn indicator command | BCM | MS-CAN | IPC DDM PDM TRM |
| Vehicle configuration data | BCM | HS-CAN | PCM HCM PAM PSCM RCM |
| Vehicle speed | ABS module | HS-CAN | PSCM BCM |
| Vehicle speed (gateway) | BCM | MS-CAN | IPC DDM PDM LTM |
| Vehicle speed (gateway) | IPC | I-CAN | ACM FCDIM |
| Vehicle trip display units | APIM | I-CAN | IPC |
| Vehicle yaw rate | RCM | HS-CAN | BCM |
| Vehicle yaw rate (gateway) | BCM | MS-CAN | GPSM |
| Vehicle yaw rate | ABS module | HS-CAN | PCM PSCM PAM |
| Washer fluid level low | BCM | MS-CAN | IPC |
| Wheel measurement | ABS module | HS-CAN | BCM PCM PAM PSCM |
| Wheel rotation count | ABS module | HS-CAN | BCM PAM |
| Wheel rotation count (gateway) | BCM | MS-CAN | IPC |
| Washer rear command | BCM | MS-CAN | IPC |
| Wheel rotation count front | ABS module | HS-CAN | BCM PAM |
| Wheel rotation count front (gateway) | BCM | MS-CAN | IPC |
| Wheel rotation direction | ABS module | HS-CAN | BCM PAM PCM |
| Wheel rotation direction (gateway) | BCM | MS-CAN | GPSM |
| Wheel speed data | BCM | MS-CAN | IPC GPSM |
| Wheel speed data (gateway) | IPC | I-CAN | FCDIM |
| Wiper speed information | BCM | MS-CAN | HVAC module |
COMMUNICATION MESSAGE CHART
SPECIAL TOOLS Fluke 77-IV Digital Multimeter FLU77-4 or equivalent Vehicle Communication Module (VCM) and Integrated Diagnostic System (IDS) software with appropriate hardware, or equivalent scan tool Flex Probe Kit NUD105-R025D or equivalent
Scheme 83
Scheme 84
Scheme 85
Possible Sources
- Fuse
- Wiring, terminals or connectors
- PCM
- Fuse
- Wiring, terminals or connectors
- ABS module
- Fuse
- Wiring, terminals or connectors
- BCM
- Fuse
- Wiring, terminals or connectors
- IPC
- Fuse
- Wiring, terminals or connectors
- PSCM
- Fuse
- Wiring, terminals or connectors
- Case ground
- RCM
- Fuse
- Wiring, terminals or connectors
- OCSM
- Fuse
- Wiring, terminals or connectors
- SASM
- Fuse
- Wiring, terminals or connectors
- PAM
- Fuse
- Wiring, terminals or connectors
- RFA module
- Fuse
- Wiring, terminals or connectors
- APIM
- Fuse
- Wiring, terminals or connectors
- ACM
- Fuse
- Wiring, terminals or connectors
- FCIM
- Fuse
- Wiring, terminals or connectors
- FCDIM
- Fuse
- Wiring, terminals or connectors
- GPSM
- Fuse
- Wiring, terminals or connectors
- BCM
- SOD-L
- SOD-R
- Fuse
- Wiring, terminals or connectors
- DSM
- Fuse
- Wiring, terminals or connectors
- HVAC module
- Fuse
- Wiring, terminals or connectors
- DSP
- Fuse
- Wiring, terminals or connectors
- HCM
- Fuse
- Wiring, terminals or connectors
- DDM
- Fuse
- Wiring, terminals or connectors
- PDM
- Fuse
- Wiring, terminals or connectors
- LTM
- Fuse
- Wiring, terminals or connectors
- IPM-B
- Fuse
- Wiring, terminals or connectors
- TRM
- Wiring, terminals or connectors
- ABS module
- APIM (if equipped)
- BCM
- HCM (if equipped)
- OCSM
- PAM (if equipped)
- PCM
- PSCM
- RCM
- SASM
- Wiring, terminals or connectors
- APIM (if equipped)
- BCM
- DDM (if equipped)
- DSM (if equipped)
- GPSM (if equipped)
- HVAC module
- IPM-B (if equipped)
- IPC
- LTM (if equipped)
- PDM (if equipped)
- RFA module (if equipped)
- Trailer module (TRM) (if equipped)
- Wiring, terminals or connectors
- APIM (if equipped)
- ACM
- Audio DSP module (if equipped)
- FCIM
- FCDIM (if equipped)
- IPC
- Fuse
- Wiring, terminals or connectors
- Data Link Connector (DLC)
- Scan tool
A loss of ground or poor ground at the DLC may result in HS-CAN, MS-CAN or I-CAN faults while the scan tool is connected.