Test M
PINPOINT TEST M: THE DEFROST SYSTEM IS INOPERATIVETest M1:
Test M2-M4:
Test M5-M6:
Test M7-M8:
Test M9:
Test M10-M11:
Normal Operation
The heated rear window will operate only when the engine is running. The heated rear window relay coil is grounded by the rear electronic module (REM) when the module receives a SCP bus signal from the dual automatic temperature control (DATC) module to turn on the heated rear window. The heated rear window relay has battery power 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 power 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
- battery junction box (BJB)
- DATC module
- REM
- heated rear window capacitor jumper circuit