Data Link Connector

The vehicle is supplied with numerous electronic control units that perform a self diagnosis function. Connecting to these control units via diagnostic equipment allows you to read the self-diagnosis information (parameters, errors) or carry out available active diagnostics. All the diagnosis lines flow into the EOBD connector (European On Board Diagnosis) which conforms with Directive 98/69/EC - ISO standard J1962 - located under the dashboard near the Body Control Module (BCM). On the same connector it is possible to diagnose all nodes (control units) connected both to the low transmission speed CAN-B for the management of standard body functions and to the high-transmission speed CAN-C for dynamic vehicle controls (bus CAN-H and CAN-L).

The 4x4 control unit also has an additional diagnosis connection, located next to the control unit itself.

Fig 1: DLC Connector Terminal Identification

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DLC multiple diagnosis connector 

The three networks are positioned in the multiple diagnosis connector in the following pins:

• Pin 3 - CAN-BH High
• Pin 11 - CAN-BH Low
• Pin 12 - CAN-C2 High
• Pin 13 - CAN-C2 Low
• Pin 14 - CAN-C1 Low
• Pin 6 - CAN-C1 High

Fig 2: DLC Location

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DLC multiple diagnosis connector position 

Digital network voltage levels 

CAN-C1 

Fig 3: Checking Voltage On CAN-C1 (High +)

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Fig 4: Checking Voltage On CAN-C1 (Low -)

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CAN-C2 

Fig 5: Checking Voltage On CAN-C2 (High +)

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Fig 6: Checking Voltage On CAN-C2 (Low -)

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CAN-BH 

Fig 7: Checking Voltage On CAN-BH (High +)

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Fig 8: Checking Voltage On CAN-BH (Low -)

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Fig 9: CAN System Waveform - Key Off

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The CAN-C1, CAN-C2 and CAN-BH enter Sleep mode approximately 10-12 seconds after the key is turned to OFF. The networks "wake up" with the key at OFF when one of the vehicle's doors passes from "Closed" status to "Open" status.

The ACC module is connected to the Half module via a dedicated CAN-C line. The reason behind the dedicated data transmission line between the two modules is the continuous exchange of information between them during operation of the cruise control and of the FCW function.

Electrical continuity of the networks 

Fig 10: Checking Resistance On CAN-C1 Circuit - (Pin 14 And Pin 6)

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Fig 11: Checking Resistance On CAN-C2 Circuit - (Pin 12 And Pin 13)

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Fig 12: Checking Resistance On CAN-BH Circuit - (Pin 11 And Pin 3)

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The three digital networks CAN-C1, CAN-C2 and CAN-BH have 120-ohm terminal resistors. The electrical continuity of the networks can be checked directly via the diagnosis connector by setting the multimeter to the Ohm function. When the network is electrically continuous, the value that the operator needs to read on the display is approximately 60 ohms for all three networks.

The central diagnostic socket receives a direct battery power supply from the line protected by a fuse located in the BCM. The BCM receives a direct power supply from the battery through the line protected by maxi fuse in the engine compartment junction unit. The BCM receives an ignition-operated power supply (INT). This signal is used, amongst other things, to "wake up the network".