Principles of Operation

Principles of Operation

There are three module communication networks connected to the data link connector (DLC), controller area network, (CAN), standard corporate protocol (SCP), and international standards organization (ISO). CAN and SCP are unshielded twisted pair cable; data bus + and data bus -, while ISO is a single wire system. The networks can be connected to the Jaguar approved diagnostic system or scan tool by the DLC.

The SCP communication network remains operational even with the severing of one of the bus wires. Communications will also continue if one of the bus wires is shorted to ground or battery positive voltage (B+), or if some, but not all, termination resistors are lost.

The ISO network, however, will not function if the circuit is damaged.

The fourth module communication network is domestic data bus (D2B), which is a fibre optic system.

The D2B network is diagnosed from the ICE head unit via the SCP network for DTCs, and by the use of the optical bus tester for diagnosis of the optical ring.

Modules may log DTCs if power supply or ground is interrupted. Supply and ground tests are in this section under the DTC number flagged, or by module name in the power supply and ground table.

The instrument cluster (also known as an instrument cluster module or ICM) is connected to the CAN and SCP communication networks, and forms a "gateway" between the networks. The networks share information, allowing sensors to serve more than one network.