Test G: The Defrost System Is Inoperative

PINPOINT TEST G: THE DEFROST SYSTEM IS INOPERATIVE

G1-G3:

G4-G6:

G6-G8:

G8-G9:

G9-G10:

G10-G11:

Normal Operation
The heated rear window operates only when the engine is running. The heated rear window relay coil is grounded by the REM when the module receives a SCP bus signal from the DATC module to turn on the heated rear window. The heated rear window relay has battery voltage to it at all times on circuits 30-HB23A (RD/WH) and 30-HB23B (RD/WH). When the REM grounds the relay coil and closes the relay, it supplies voltage to the heated rear window over circuit 15S-DA13 (GN/YE) to circuit 15S-HB19A (GN/BU) through the heated rear window capacitor jumper circuit, then to circuit 15S-HB19 (GN/BU).

Possible Causes
- circuit 15S-DA13 (GN/YE), 15S-HB19 (GN/BU) open
- heated rear window relay
- BJB
- DATC module
- REM
- heated rear window capacitor jumper circuit