Instrument Cluster
The instrument cluster is on the CAN. It is an analog face cluster with a digital odometer. The instrument cluster displays a variety of information. Check the communications network circuits 1827 (WH/LG) and 1828 (PK/LG) between the instrument cluster C220a 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 C220a, or a problem in the in-line connector. For additional information, refer to INSTRUMENT CLUSTER .
Powertrain Control Module (PCM)
The PCM is on the CAN. The PCM controls the engine for better fuel economy, emissions control, failure mode detection and storage. If one of the communications network circuits become shorted to ground or voltage, or if some but not all termination resistors are lost, communications can continue. Check the communications network circuits 1827 (WH/LG) and 1828 (PK/LG) between the PCM C175 (gasoline) or PCM C176a (diesel) 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 PCM C175 (gasoline), damage to the PCM C176a (diesel) or a problem in the in-line connector. For additional information, See INTRODUCTION - GASOLINE and/or INTRODUCTION -- 6.0L DIESEL articles.
Restraint Control Module (RCM)
The RCM is on the ISO 9141 communications network. The RCM controls the deployment of the air bags based on sensor input. The ISO 9141 communications network does not function if the circuit is shorted to ground or battery voltage. Check the communications network circuit 70 (LB/WH) between the RCM C310a and the DLC C251. The total resistance value must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the ISO 9141 communications network, damage to the DLC C251, damage to the RCM C310a, or a problem in the in-line connector. For additional information, refer to SUPPLEMENTAL RESTRAINT SYSTEM .
Vehicle Security Module
The vehicle security module is on the ISO 9141 communications network. The vehicle security module controls the remote keyless entry (RKE) function as well as the power door locks. The ISO 9141 communications network does not function if the circuit is shorted to ground or battery voltage. Check the communications network circuit 70 (LB/WH) between the vehicle security module C203b and the DLC C251. The total resistance value must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the ISO 9141 communications network, damage to the DLC C251, damage to the vehicle security module C203b, or a problem in the in-line connector. For additional information, refer to MULTIFUNCTION ELECTRONIC MODULES .