CHECK HARNESS.

1) Turn the ignition switch to ON.

2) Using the tester, measure the voltage between terminals of data link connector and chassis ground.

Connector & terminal

(B40) No. 6 (+) — Chassis ground (−):
(B40) No. 14 (+) — Chassis ground (−):

QUESTION
Is the voltage 6 V or more?
Yes	No
	Replace the body integrated unit.