CHECK POWER SUPPLY CM.

1) Connect the power supply CM connector.

2) Using a tester, measure the voltage between the power supply CM connector and chassis ground when the ignition is turned to OFF and to ON.

Connector & terminal

(B420) No. 34 (+) — Chassis ground (−):

(B420) No. 35 (+) — Chassis ground (−):

QUESTION

Did the voltage change from 1 V or less to → + B - 2 V or more?

Yes No

System is normal.

Replace the power supply CM.