ISO11898 - DIN plug only !

The Haldex Can bus uses 4 wires, 2 are for power supply, 2 for the communication (CAN High and CAN Low)

It can be used for ECU extensions, diagnostic or telematic.

The main use with 3rd party devices, is communication purpose. Only communication wires and B- may be used in this case : you can check if ECU CAN High/Low average voltage is Ok, and also B- on the DIN connector.

Some other devices may only use B+/B- on this connector.

Test points

Condition

Required value

Measured value

Comments

DIN plug

1 / 2

Power ON

B+

If the measured value is below B+, it can indicate a resistance in the wiring

Next steps :

check for oxidation marks in the connectors
check the continuity of the wires with ohmmeter (R<5Ω for correct operation)

DIN plug

3 / 2

Power ON

0V < V < 5V

The average voltage of CAN High wire is around 2.5V

Next steps :

check for oxidation marks in the connectors
check the continuity of the wires with ohmmeter (R<5Ω for correct operation)

DIN plug

4 / 2

Power ON

0V < V < 5V

The average voltage of CAN Low wire is around 2.5V

Next steps :

check for oxidation marks in the connectors
check the continuity of the wires with ohmmeter (R<5Ω for correct operation)