- Start the engine.
- Activate the rear window defogger system.
- 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, test the grid line
in at least 2 places (1,3) to eliminate the possibility of bridging the open
(2) in the grid line. |
- If an open (2) is located, replace the rear window. Refer
to
Rear Window Replacement
.