Checking the wires and components
Check the wire between relay 2/82 #3 and the broad flat pin on the red radio aerial amplifier in the left D-pillar for an open circuit as described in Open-circuit, permanent faults and a short circuit to ground as described in Short-circuit to ground, permanent faults .
Check the copper tab between the red radio aerial amplifier in the left D-pillar and the rear window heating elements for an open circuit as described in Open-circuit, permanent faults and a short circuit to ground as described in Short-circuit to ground, permanent faults .
Check the grounding of the heating elements in the right D pillar to the ground point for an open circuit, as described in Open-circuit, permanent faults .
Check the heating elements for an open circuit, as described in Open-circuit, permanent faults . Test between the copper tabs in the left and right D pillar.
HINT: An open circuit can only be detected if none of the heating elements work.
If only a few of the heating elements are defective they can be identified by activating the heated rear window and then breathing on the rear window heating elements one at a time. The mist disappears faster from a heating element that is working.
Do the necessary corrective action.
Additional information:
- For information about signals and other values, see Signal specification and Signal specification
- To access the radio aerial amplifier, see Windshield antenna and amplifier .
- To replace the rear window, see Rear window removal .
- Fault-free heating elements have a resistance of 0.41 ohm at 20°C (68°F). If the resistance is higher then one or more heating element is defective.