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Is the ignition switch ON?
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Turn the ignition switch to ON, and select VDC 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 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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Is the system name 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&H/U connector.
3) Turn the ignition switch to ON.
4) Check whether communication to other systems can be executed normally.
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Is the system name displayed on Subaru Select Monitor?
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Replace the VDCCM&H/U. 
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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 connectors from VDCCM&H/U, ECM, TCM, power steering CM, airbag CM and body integrated unit.
CAUTION:
When disconnecting the connector from airbag CM, always follow the precautions on AB section.
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 HARNESS CONNECTOR BETWEEN VDCCM&H/U AND DATA LINK CONNECTOR.
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 less than 1 V?
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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&H/U AND DATA LINK CONNECTOR.
Measure the resistance between VDCCM&H/U connector and data link connector.
Connector & terminal
(B310) No. 7 — (B40) No. 7:
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Is the resistance less than 1 Ω?
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Repair harness and connector between VDCCM&H/U and data link connector.
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9.CHECK INSTALLATION OF VDCCM&H/U CONNECTOR.
Turn the ignition switch to OFF.
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Is the VDCCM&H/U connector inserted into VDCCM&H/U until the clamp locks onto it?
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Insert VDCCM&H/U connector into VDCCM&H/U.
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10.CHECK POWER SUPPLY CIRCUIT.
1) Turn the ignition switch to ON. (engine OFF)
2) Measure the ignition power supply voltage between VDCCM&H/U connector and chassis ground.
Connector & terminal
(B310) No. 28 (+) — Chassis ground (−):
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Is the voltage 10 — 15 V?
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Repair open circuit in harness between VDCCM&H/U and battery.
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11.CHECK HARNESS CONNECTOR BETWEEN VDCCM&H/U AND CHASSIS GROUND.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the VDCCM&H/U.
3) Measure the resistance of harness between VDCCM&H/U connector and chassis ground.
Connector & terminal
(B310) No. 25 — Chassis ground:
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Is the resistance less than 10 Ω?
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Repair the open circuit of VDCCM&H/U ground harness and poor contact of connector.
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12.CHECK POOR CONTACT OF CONNECTOR.
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Is there poor contact of control module power supply, ground circuit and data link connector?
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Replace the VDCCM only.
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