Communication For Initializing Impossible: Wiring Diagram

Fig 1: Subaru Select Monitor - Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

Step	Check	Yes	No
1 CHECK IGNITION SWITCH.	Is the ignition switch ON?	Go to step 2.	Turn the ignition switch to ON, and select VDC mode using Subaru Select Monitor.
2 CHECK BATTERY. Turn the ignition switch to OFF. Measure the battery voltage.	Is the voltage 11 V or more?	Go to step 3.	Charge or replace the battery.
3 CHECK BATTERY TERMINAL.	Is there poor contact at battery terminal?	Repair or tighten the battery terminal.	Go to step 5 .
4 CHECK INSTALLATION OF VDCCM&H/U CONNECTOR. Turn the ignition switch to OFF.	Is the VDCCM&H/U connector inserted into VDCCM&H/U until the clamp locks onto it?	Go to step 5.	Insert VDCCM&H/U connector into VDCCM&H/U.
5 CHECK LAN SYSTEM. Perform the diagnosis for LAN system. Refer to BASIC DIAGNOSTIC PROCEDURE .	Is there any fault in LAN system?	Perform the diagnosis according to DTC for LAN system. Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) .	Go to step 6 .
6 CHECK SUBARU SELECT MONITOR COMMUNICATION. Turn the ignition switch to ON. Check whether communication to VDC system can be executed normally.	Is the system name displayed on Subaru Select Monitor?	Check the DTC in VDC system. Refer to READ DIAGNOSTIC TROUBLE CODE (DTC) .	Go to step 7 .
7 CHECK POWER SUPPLY CIRCUIT. Turn the ignition switch to ON. (engine OFF) Measure the ignition power supply voltage between VDCCM&H/U connector and chassis ground. Connector & terminal (B310) No. 4 (+) - Chassis ground (-): (B310) No. 1 (+) - Chassis ground (-): (B310) No. 26 (+) - Chassis ground (-):	Is the voltage 10 - 15 V?	Go to step 8.	Repair open circuit in harness between VDCCM&H/U and battery.
8 CHECK HARNESS CONNECTOR BETWEEN VDCCM&H/U AND CHASSIS GROUND. Turn the ignition switch to OFF. Disconnect the connector from the VDCCM&H/U. Measure the resistance of harness between VDCCM&H/U connector and chassis ground. Connector & terminal (B310) No. 14 - Chassis ground:	Is the resistance less than 10 Ω?	Go to step 9.	Repair the open circuit of VDCCM&H/U ground circuit and poor contact of connector.
9 CHECK POOR CONTACT OF CONNECTOR.	Is there poor contact of control module power supply, ground circuit and data link connector?	Repair the connector.	Replace the VDCCM&H/U. Refer to VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM&H/U) .