Test I: The Defrost System Is Inoperative - Heated Wiper Park

PINPOINT TEST I: THE DEFROST SYSTEM IS INOPERATIVE - HEATED WIPER PARK

I1-I2:

I2-I3:

I3-I4:

I5-I6:

I6-I7:

I7 Continued:

Normal Operation
The heated wiper park relay is supplied voltage by the through circuits 30-HB8 (RD/OG). When the ambient temperature falls below 3°C (38°F), the digital automatic temperature control (DATC) module grounds circuit 91S-HB7 (BN/RD), closing the heated wiper park relay. This allows voltage to flow through circuit 30S-HB42 (RD/YE) to the heated wiper park grids in the windshield.

Possible Causes
- fuse
- circuit 30-HB8 (RD/OG) open
- circuit 30S-HB42 (RD/YE) open
- circuit 31-HB42 (BK/YE) open
- circuit 91S-HB7 (BN/RD) open
- heated wiper park relay
- DATC module
- heated wiper park grids