Cause of malfunction | Elimination Method |
Individual filaments of the heating element do not heat up | |
Thread break | Replace glass with heating element |
None of the threads get hot | |
Faulty switch, relay, rear window heating fuse, damaged wires, oxidized or badly connected tips, disconnected contact from the glass heating element | Faulty switch, relay, fuse, wires replace. Clean, crimp terminals. If the terminal is soldered from the heating element, replace the glass with the heating element |