CHECK HARNESS.

1) Turn the ignition switch to OFF.

2) Disconnect the PTC heater connector.

3) Use a tester to measure the resistance between the relay holder and PTC heater.

(F9) No. 6 — (B461) No. 2:

(F9) No. 6 — (B462) No. 2:

(B473) No. 5 — (B470) No. 2:

(B473) No. 10 — (B471) No. 1:

(B473) No. 15 — (B471) No. 3:

QUESTION

Is the resistance less than 10 Ω?

Yes No

Repair or replace the harness.