- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
Did you check voltage and ground at rear defog connector, purple wire should be voltage, black wire is ground. Check to see what your missing, defog turned on. If you have good voltage and ground, then suspect a break in the defog grid. If you can locate the break, the auto store should have some stuff you can paint over the break to allow continuity for the grid.
Also, you should be able to check grid continuity, ohms test. If no continuity, something wrong with grid.
Here is partial diagram.
Have you done any testing? If not, find the connector for rear defogger grid, probably in the trunk, somewhere. The purple wire is voltage, the black wire is ground. Turn on defogger, use a testlite between terminals, if the lite comes on, the problem should be with the defogger grid, itself. You can check for continuity in the defogger grid. If no continuity, there is a break in the grid, If you can find the break in the grid, the auto store should have this stuff that you can paint over the break allowing continuity in the grid.
or rear defog
the rear is a heater element, it has 2 wire terminals
if 12vdc is not present there, the relay feed is bad.
if 12vdc is present there the heater grid is open
got a voltmeter? (any kind, dmm, dvm, any)
You want to make sure to pull the little plastic pieces up by the rear window to check the plug. if the relay and fuse don't fix your problem. Take a multi-meter and set it to 20 VDC and just probe the ends of the connector[s] for proper voltage.
The rear defogger is controlled by the Electronic Time and Alarm Control Module (ETACM). It receives a signal from the switch, and if the car is running, turns on the rear window defogger. Most frequently the problem is a blown 30A defogger fuse. Other common problems are the defogger switch itself or the switch not being plugged in properly, but there can also be a bad defogger relay, defective ETACM, or wiring issue. If you're capable of doing some electrical diagnosis, I'd encourage you to register for a free account at www.hmaservice.com (requires Internet Explorer and Adobe SVG Viewer) and print the schematic from the site. Also, does the indicator lamp come on when you depress the defogger button,I hope this help you in the right direction now you know how it works
A common thing to fial on these- assumning the grid is ok, and wires are still attched to grid, is the rear def / antenna module. It is behind rt. rear quarter trim panel. The modules burn up, and also melt the connector. the module and connector would need to be replaced.