1) Turn the ignition switch to OFF.
2) Disconnect the connector from the VDCCM&H/U.
3) Measure the resistance between VDCCM&H/U and chassis ground.
Connector & terminal
(B310) No. 25 — Chassis ground:
Is the resistance less than 0.5 Ω?
Repair the VDCCM&H/U ground harness.