- Start the engine.
- Turn the rear window defogger ON.
- Connect a test lamp to a good ground.
Important: The test lamp brilliance will decrease proportionately to the increased resistance
in the grid line as the probe is moved from the battery positive bus wire to the
ground bus wire. The test lamp brilliance may vary from one window to another.
- Move the test lamp probe from zone 5 to zone 1 along each grid
line.
• | If the test lamp goes out, locate the open
in that grid line. Test every grid line in at least 2 places (1, 3)
to eliminate the possibility of bridging an open (2) in the grid line. |
- If an open is located, replace the rear window. Refer to
Rear Window Replacement
.