Test H: The Defrost System Is Inoperative

PINPOINT TEST H: THE DEFROST SYSTEM IS INOPERATIVE

H1-H3:

H3-H6:

H6-H8:

H8-H10:

H11-H12:

Normal Operation
With the key in the START or RUN position and the rear window heater switch turned to the on position, the rear window defrost relay is energized providing voltage to the rear window defrost grid on circuit 15S-HB19 (GN/BU), the LH exterior rear view mirror on circuit 15S-HB35 (GN/BK) and the RH exterior rear view mirror on circuit 15S-HB36 (GN/OG). On 3-door and 5-door models, the rear window defrost grid is connected directly to ground. For all other models, the rear window defrost grid is connected to ground through circuit 31-HB19 (BK). The LH exterior rear view mirror is grounded through circuit 31-HB35 (BK). The RH exterior rear view mirror is grounded through circuit 31-HB36 (BK).

Possible Causes
- fuse(s)
- circuit 15-DA1 (GN/YE) open
- circuit 15S-HB19 (GN/BU) open
- circuit 30-DA1 (RD) open
- circuit 31-HB19 (BK) open
- circuit 31S-HB31 (BK/OG) open
- heated rear window relay
- smart junction box (SJB)
- heater control module
- rear window defrost grid