CHECK VDCCM&H/U INPUT VOLTAGE.

1) Disconnect the connector from the VDCCM&H/U.

2) Run the engine at idle.

3) Operate devices such as headlights, air conditioner, defogger, etc. which produce an electrical load.

4) Measure the voltage between VDCCM&H/U connector and chassis ground.

Connector & terminal

(B310) No. 28 (+) — Chassis ground (−):

QUESTION

Is the voltage 10 — 15 V?

Yes No

Repair the power supply circuit.