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Is the ignition switch turned ON?
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Turn the ignition switch to ON, and select VDCCM mode using Subaru Select Monitor.
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2.CHECK BATTERY.
1) Turn the ignition switch to OFF.
2) Measure the battery voltage.
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Is the voltage 11 V or more?
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Charge or replace the battery.
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3.CHECK BATTERY TERMINAL.
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Is there poor contact at the battery terminal?
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Repair or tighten the battery terminal.
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4.CHECK SUBARU SELECT MONITOR COMMUNICATION.
1) Turn the ignition switch to ON.
2) Using the Subaru Select Monitor, check whether communication to other systems can be executed normally.
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Are the system name and year displayed on Subaru Select Monitor?
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5.CHECK SUBARU SELECT MONITOR COMMUNICATION.
1) Turn the ignition switch to OFF.
2) Disconnect the VDCCM connector.
3) Check whether communication to other systems can be executed normally.
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Are the system name and model year displayed on Subaru Select Monitor?
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6.CHECK HARNESS CONNECTOR BETWEEN EACH CONTROL MODULE AND DATA LINK CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the VDCCM connector.
3) Measure the resistance between data link connector and chassis ground.
Connector & terminal
(B40) No. 7 — Chassis ground:
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Is the resistance 1 MΩ or more?
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Repair the harness and connector between each control module and data link connector.
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7.CHECK OUTPUT SIGNAL FOR VDCCM.
1) Turn the ignition switch to ON.
2) Measure the voltage between data link connector and chassis ground.
Connector & terminal
(B40) No. 7 (+) — Chassis ground (−):
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Is the voltage 1 V or more?
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Repair the harness and connector between each control module and data link connector.
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8.CHECK HARNESS CONNECTOR BETWEEN VDCCM AND DATA LINK CONNECTOR.
Measure the resistance between VDCCM connector and data link connector.
Connector & terminal
(B310) No. 38 — (B40) No. 7:
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Is the resistance less than 0.5 Ω?
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Repair the harness and connector between VDCCM and data link connector.
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9.CHECK INSTALLATION OF VDCCM CONNECTOR.
Turn the ignition switch to OFF.
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Is the VDCCM connector inserted into the VDCCM until the clamp is secured?
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Insert the VDCCM connector into the VDCCM until the clamp is secured.
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10.CHECK POWER SUPPLY CIRCUIT.
1) Turn the ignition switch to ON (engine is OFF).
2) Measure the ignition power supply voltage between the VDCCM connector and chassis ground.
Connector & terminal
(B310) No. 28 (+) — Chassis ground (−):
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Is the voltage 10 V or more?
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Repair open circuit of harness between VDCCM and battery.
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11.CHECK HARNESS CONNECTOR BETWEEN VDCCM AND CHASSIS GROUND.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from VDCCM and transmission.
3) Measure the resistance of the harness between VDCCM and chassis ground.
Connector & terminal
(B310) No. 1 — Chassis ground:
(B310) No. 55 — Chassis ground:
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Is the resistance less than 1 Ω?
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Repair the open circuit of the harness between the VDCCM and inhibitor switch connector, and the poor contact of connector.
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12.CHECK THE POOR CONTACT OF CONNECTOR.
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Is there poor contact in control module power supply, ground line and in the data link connector?
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Replace the VDCCM. 
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