DIAGN/CAN to TPMS RCU

Find here extended description, connector views, and help for diagnostic as well !

Description

  • To connect a TPMS Receiver Control Unit (RCU) to the DIAGN/CAN socket of the ECU.
  • TPMS system allows to connect up to 2 Reciever Control Units (RCU). Depending of the vehicle type and Haldex Can Bus layout, the corresponding cable should be used.
  • ID is determined by voltage on pin 8, CAN resistor is located in the RCU. Both options are realised with shunts in the FCI plug.
  • Conforms to IP67 when mated with ECU or DIAGN/CAN splitter and TPMS RCU
  • Cable insulation material : PVC

 

814 040 0xx - Rear unterminated - Without CAN resistor, RCU ID 3 - Blue label

4 Pole AUX to Female FCI Blue.png

814 040 1xx - Front unterminated - Without CAN resistor, RCU ID 2 - Yellow label

4 Pole AUX to Female FCI YELLOW.png

814 040 2xx - Front terminated - With CAN resistor, RCU ID 2 - Red label

4 Pole AUX to Female FCI RED.png

DIAGN/CAN plug

Can Plug ok.png

Pin Description Color Section (mm2)
1 B+ Red 0.75
2 CAN High Green 0.75
3 CAN Low Yellow 0.75
4 B- Blue 0.75

 "A" indicate the clip side

FCI plug

FCI plug.png

Pin Description Color Section (mm2)

1

TPMS cable logo.png

5V CAN High Green 0.75
2 Not used - -

3

TPMS cable logo.png

5V CAN Low Yellow 0.75

4

TPMS cable logo red.png

CAN resistor

(only for 814 040 2xx)

- -
5 Not used - -

6

TPMS cable logo red.png

5V CAN High bridge

(only for 814 040 2xx)

- -

7

TPMS cable logo.png

B+ Red 0.75

8

TPMS cable logo yellow red.png

ID Pin

(Not for 814 040 0xx, see comment)

- -

9

TPMS cable logo.png

B- Blue 0.75
10 not used - -

Diagnostic

TPMS is an extension of EB+/U-ABS, using the Haldex Can Bus for the power supply and the communication.

The supply of the RCU must be checked if the communication between ECU and TPMS RCU is not Ok.

Test points Condition Required value Mesured value Comments

FCI plug

 7 - 9

Power ON

B+  

If the mesured 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)

 

FCI plug

1 - 9

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)

FCI plug

3 - 9

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)

FCI plug

4 - 6

Power OFF

For 814 040 2xx, R < 5Ω

 

This link inside the connector activate the CAN Bus resistor inside the TPMS RCU

FCI plug

8 - 9

Power OFF

For 814 040 0xx, R > 5MΩ

For 814 040 1xx and 2xx, R < 5Ω

 

This link inside the plug gives a specific ID to identify the TPMS RCU ID