CHECK HARNESS.

1) Install the rear fog light relay.

2) Measure the voltage between body integrated unit connector and chassis ground.

Connector & terminal

(B279) No. 18 (+) — Chassis ground (−):

QUESTION

Does the voltage change from 8 V or more → less than 1.5 V, when the headlight switch is ON and rear fog light switch is ON.

Yes No

Temporary poor contact occurs.