Communication For Initializing Impossible

Detecting condition: 

Defective harness connector

Trouble symptom: 

Communication is impossible between VDC and Subaru Select Monitor.

Wiring diagram: 

Vehicle dynamics control system Ref. to WIRING SYSTEM (CROSSTREK MODEL (HEV))>VEHICLE DYNAMICS CONTROL SYSTEM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK IGNITION SWITCH  .

   Is the ignition switch ON?

   Yes:  Go to  2.

   No:  Turn the ignition switch to ON, and select the [Brake Control] using the Subaru Select Monitor.

2. CHECK BATTERY  .
   1. Turn the ignition switch to OFF.
   2. Measure the battery voltage.

   Is the voltage 11 V or more?

   Yes:  Go to  3.

   No:  Charge or replace the battery. Ref. to STARTING/CHARGING SYSTEMS (H4DO(HEV))>BATTERY .

3. CHECK BATTERY TERMINAL  .

   Is there poor contact at battery terminal?

   Yes:  Replace or tighten the battery terminal.

   No:  Go to  4.

4. CHECK INSTALLATION OF VDCCM AND H/U CONNECTOR  .

   Turn the ignition switch to OFF.

   Is the VDCCM and H/U connector inserted into VDCCM and H/U until the clamp locks onto it?

   Yes:  Go to  5.

   No:  Insert VDCCM and H/U connector into VDCCM and H/U.

5. CHECK LAN SYSTEM  .

   Check the LAN system. Ref. to LAN SYSTEM (DIAGNOSTICS) (HEV)>BASIC DIAGNOSTIC PROCEDURE .

   Is the check result OK?

   Yes:  Go to  6.

   No:  Perform the diagnosis for LAN system.

6. CHECK SUBARU SELECT MONITOR COMMUNICATION  .
   1. Turn the ignition switch to ON.
   2. Check whether communication to VDC system can be executed normally.

   Is the [Select Function] screen displayed?

   Yes:  Check the DTC in VDC system. Ref. to BRAKE CONTROL (DIAGNOSTICS) (HEV)>DIAGNOSTIC TROUBLE CODE (DTC) .

   No:  Go to  7.

7. CHECK SUBARU SELECT MONITOR COMMUNICATION  .

   Connect the Subaru Select Monitor to another vehicle to check whether the communication for initializing can be executed normally.

   Does the Subaru Select Monitor communicate normally?

   Yes:  Go to  8.

   No:  Repair or replace the Subaru Select Monitor.

8. CHECK POWER SUPPLY CIRCUIT  .
   1. Turn the ignition switch to ON. (Engine OFF)
   2. Measure the ignition power supply voltage between VDCCM and H/U connector and chassis ground.

      Connector and terminal 

      (B310) No. 1 (+) - Chassis ground (-):

      (B310) No. 30 (+) - Chassis ground (-):

      (B310) No. 35 (+) - Chassis ground (-):

   Is the voltage 10 - 15 V?

   Yes:  Go to  9.

   No:  Repair open circuit in harness between VDCCM and H/U and battery.

9. CHECK HARNESS CONNECTOR BETWEEN VDCCM AND H/U AND CHASSIS GROUND  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the connector from the VDCCM and H/U.
   3. Measure the resistance of harness between VDCCM and H/U connector and chassis ground.

      Connector and terminal 

      (B310) No. 14 - Chassis ground:

   Is the resistance less than 10 Ω?

   Yes:  Go to  10.

   No:  Repair the open circuit of VDCCM and H/U ground circuit and poor contact of connector.

10. CHECK POOR CONTACT OF CONNECTOR  .

    Is there poor contact of control module power supply, ground circuit and data link connector?

    Yes:  Repair the connector.

    No:  Replace the VDCCM and H/U. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM & H/U) .