Test E: The Defrost System Will Not Shut Off Automatically

PINPOINT TEST E: THE DEFROST SYSTEM WILL NOT SHUT OFF AUTOMATICALLY

E1-E3:

E3-E4:

Normal Operation
When the rear defrost switch on the climate control assembly is pressed, a signal is sent to the smart junction box (SJB) to ground circuit 1389 (WH). This closes the heated rear window relay, allowing voltage to be supplied to the heated rear window grid through circuit 186 (BN/LB). The heated rear window grid is grounded by circuit 1205 (BK).

Possible Causes
- Circuit 186 (BN/LB) short to voltage
- Circuit 1389 (WH) short to ground
- Heated rear window switch
- Heated rear window relay
- Smart junction box (SJB)