- Start the engine.
- Turn the rear window defogger ON.
Important: The test lamp brilliance will decrease proportionately to the increased resistance
in the grid line as the test lamp is moved from the battery positive bus wire to
the ground bus wire. The test lamp brilliance may vary from one window to another.
- Probe each grid line in each zone (1, 2, 3, 4, 5)
with a test lamp connected to a good ground.
| • | If the test lamp shows full brilliance at both ends of the grid lines,
inspect for an open or poor connection in the ground circuit of the rear window
defogger grid. Refer to
Circuit Testing
and
Wiring Repairs
in Wiring Systems. |
| • | 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 the open (2) in the grid line. |
- If an open is located, replace the rear window. Refer to
Folding Top Rear Window Replacement
in Roof.
