Information Bus: Description and Operation

COMMUNICATIONS NETWORK

Powertrain Control Module (PCM)
The PCM uses the high speed controller area network (CAN) for communication with the diagnostic tool and other modules on the high speed CAN. The PCM controls the engine for better fuel economy, emissions control, failure mode detection and storage, and all passive anti-theft system (PATS) functions.

Check the high speed CAN circuits between the PCM C175b and the data link connector (DLC) C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the high speed CAN, damage to the DLC C251, damage to the PCM C175b, or a problem in the in-line connector.

Transmission Control Module (TCM) - 6-Speed Transaxle
The TCM (if equipped) uses the high speed CAN for communication with the diagnostic tool and other modules on the high speed CAN. The TCM controls transaxle shifting, the electronic pressure control solenoid, and the torque converter clutch.

Check the high speed CAN circuits between the TCM C1533 and the DLC C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the high speed CAN, damage to the DLC C251, damage to the TCM C1533, or a problem in the in-line connector.

Transmission Control Module (TCM) - FNR5 Transaxle
The TCM (if equipped) uses the high speed CAN for communication with the diagnostic tool and other modules on the high speed CAN. The TCM controls transaxle shifting, the electronic pressure control solenoid, and the torque converter clutch.

Check the high speed CAN circuits between the TCM C2352b and the DLC C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the high speed CAN, damage to the DLC C251, damage to the TCM C2352b, or a problem in the in-line connector.

Anti-Lock Brake System (ABS) Module
The ABS module uses the high speed CAN for communication with the diagnostic tool and other modules on the high speed CAN. The ABS module controls the brake pressure to the 4 wheels to keep the vehicle under control while braking.

Check the high speed CAN circuits between the ABS module C135 and the DLC C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the high speed CAN, damage to the DLC C251, damage to the ABS module C135, or a problem in the in-line connector.

Restraint Control Module (RCM)
The RCM uses the high speed CAN for communication with the diagnostic tool and other modules on the high speed CAN. The RCM controls the deployment of the air bags based on sensor input.

Check the high speed CAN circuits between the RCM C310b and the DLC C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the high speed CAN, damage to the DLC C251, damage to the RCM C310b, or a problem in the in-line connector.

Occupant Classification Sensor
The occupant classification sensor uses the high speed CAN for communication with the diagnostic tool and other modules on the high speed CAN. The occupant classification sensor provides the status of the front passenger seat occupant to the RCM system controlling the deployment of the passenger air bag based on sensor input.

Check the high speed CAN circuits between the occupant classification sensor C3159 and the DLC C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the high speed CAN, damage to the DLC C251, damage to the occupant classification sensor C3159, or a problem in the in-line connector.

Instrument Cluster
The instrument cluster uses both the high speed CAN and the medium speed CAN. The instrument cluster displays a variety of vehicle system(s) status.

Check the CAN circuits between the instrument cluster C220 and the DLC C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the CAN, damage to the DLC C251, damage to the instrument cluster C220, or a problem in the in-line connector.

Smart Junction Box (SJB)
The SJB uses the medium speed CAN for communication with the diagnostic tool and other modules on the medium speed CAN. The SJB is equipped on all vehicles and is a combination of a multifunction module and an interior power junction box. The SJB controls multiple systems, which include:
- warning chimes
- illuminated entry
- exterior lamps
- backlighting
- horn
- interior lamps
- power door locks
- smart locks
- remote keyless entry (RKE) keypad
- RKE system
- front windshield wiper
- heated rear window

Check the medium speed CAN circuits between the SJB C2280d and the DLC C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the medium speed CAN, damage to the DLC C251, or damage to the SJB C2280d.

Driver Door Module (DDM)
The DDM (if equipped) uses the medium speed CAN for communication with the diagnostic tool and other modules on the medium speed CAN. The DDM stores the driver's seat and mirror positions for recall.

Check the medium speed CAN circuits between the DDM C568a and the DLC C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the medium speed CAN, damage to the DLC C251, or damage to the DDM C568a.

Driver Seat Module (DSM)
The DSM module (if equipped) uses the medium speed CAN for communication with the diagnostic tool and other modules on the medium speed CAN. The DSM controls the position of the power driver seat, and the power outside rear view mirrors.

Check the medium speed CAN circuits between the DSM C3299c and the DLC C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the medium speed CAN, damage to the DLC C251, or damage to the DSM C3299c.

Climate Controlled Seat Module
The climate controlled seat module (if equipped) uses the medium speed CAN for communication with the diagnostic tool and other modules on the medium speed CAN. The climate controlled seat module controls the heating and cooling elements in the seat for passenger comfort.

Check the medium speed CAN circuits between the climate controlled seat module C3305c and the DLC C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the medium speed CAN, damage to the DLC C251, or damage to the climate controlled seat module C3305c.

Climate Control Assembly
Both the dual automatic temperature control (DATC) module and the electronic automatic temperature control (EATC) module are referred to as the climate control assembly. The climate control assembly uses the medium speed CAN for communication with the diagnostic tool and other modules on the medium speed CAN. The climate control assembly controls the automatic climate functions that maintain the vehicle interior temperature at a constant setting.

Check the medium speed CAN circuits between the DATC module C2356a or EATC module C228a and the DLC C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the medium speed CAN, damage to the DLC C251, or damage to the climate control assembly connector.

Audio Unit (Base Audio and Audiophile)
The audio unit uses the medium speed CAN for communication with the diagnostic tool and other modules on the medium speed CAN.

Check the medium speed CAN circuits between the audio unit C290b and the DLC C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the medium speed CAN, damage to the DLC C251, or damage to audio unit C290b.

Audio Unit (THXII with Navigation)
The audio unit (THXII with navigation, if equipped), uses the medium speed CAN for communication with the diagnostic tool and other modules on the medium speed CAN.

Check the medium speed CAN circuits between the audio unit C240c and the DLC C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the medium speed CAN, damage to the DLC C251, or damage to audio unit C240c.

Digital Signal Processing Module
The digital signal processing module (if equipped) uses the medium speed CAN for communication with the diagnostic tool. The digital signal processing module works with the audio unit allowing the listener expanded signal manipulation and audio control.

Check the medium speed CAN circuits between the digital signal processing module C4326a and the DLC C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the medium speed CAN, damage to the DLC C251, or damage to digital signal processing module C4326a.