Test E: The Defrost System Is Inoperative

PINPOINT TEST E: THE DEFROST SYSTEM IS INOPERATIVE

E1-E2:

E3-E5:

E5 Continued:

E6:

E7-E9:

E9-E11:

E11-E12:

E12-E13:

Normal Operation
The heated rear window is controlled by the driver door module (DDM). The ignition switch must be in RUN for the DDM to operate. When the rear window defrost switch is pressed, the DDM provides a ground for the rear window defrost relay coil through circuit 688 (GY/LB). The rear window defrost relay coil is energized, providing battery voltage to the antenna module on circuit 186 (BN/LB). The antenna module then supplies voltage and ground to the heated rear window grid.

Possible Causes
- Fuse(s)
- Circuit 57 (BK) open
- Circuit 185 (BK) open
- Circuit 186 (BN/LB) open or short to ground
- Circuit 640 (RD/YE) open
- Circuit 688 (GY/LB) open or short to voltage
- Circuit 1010 (DB/OG) open.
- Rear window defrost relay
- Rear window defrost switch
- Heated rear window grid
- Antenna module
- DDM