CHECK HARNESS.

1) Turn the ignition switch to OFF.

2) Using a tester, check continuity between the power supply CM and stop light switch.

Connector & terminal

5 door model

(B420) No. 1 — (B65) No. 2:
(B65) No. 1 — F/B fuse No. 8:

4 door model

(B420) No. 1 — (B65) No. 4:
(B65) No. 3 — F/B fuse No. 8:

QUESTION
Is there continuity?
Yes	No
Replace the power supply CM.	Repair or replace the harness.