CHECK HARNESS.

1) Disconnect the power supply CM connector (B420).

2) Measure the voltage between the power supply CM connector and chassis ground.

Connector & terminal

(B420) No. 12 (+) — Chassis ground (−):
(B420) No. 33 (+) — Chassis ground (−):

QUESTION
Is the voltage 10 V or more?
Yes	No
	Repair the open or shorted circuit of harness.