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Rear defrost grid no-go, but fuses/switch fine-what's up?
Posted 24 November 2003 - 02:33 PM
Rear window defrost grid ('87 GL Wagon) does not defrost. Hooked a multimeter at the right and left connectors after removing them from grid on window. There is no voltage across these two connectors.
However, the dual 15amp fuses are fine at the fuse box and the switch lights up, as does the glyph on the dashboard.
Is there any other fuse/? I ought to be looking at? This seems so simple: all electrics are "there" but no joy at the rear glass.
Posted 24 November 2003 - 04:24 PM
Do you hear any sound of a click, other than the switch when you push it? If not, I'd bet it's the relay.
Posted 24 November 2003 - 04:28 PM
Or, if someone has an electrical diagram I can go at that...
Posted 24 November 2003 - 05:11 PM
Posted 24 November 2003 - 05:13 PM
I have fixed my Targa rear grid using the paste you refer to. That does take a bit of skill!
Posted 25 November 2003 - 02:37 PM
So last call - does anyone know if there is a relay I ought to be looking for? The '88 manual's electrical diagrams don't seem to show anything...
Posted 25 November 2003 - 03:59 PM
It's power is fed by fuses 17 and 18 in parallel
The relay coil and the dash indicator are powered by fuse 12.
You do not say what fuel system your car has
Why would that matter??
A Carb car in 87 with 4wd has no ECU
Others fuel systems do
The relay mounting may be different as they are above the ECU on fuel injected cars.
The relays will be mounted in clusters somewhere up above the st. col.
The one you are looking for has these colored wires
Relays may be interchanged to prove one is toast
here is what you are looking for
Sure hope this helps, would not want you fogged in.
I can scan the diagram for you if need be, email me
Posted 25 November 2003 - 04:09 PM
So I should look somewhere above the steering column? Are the relays easy to get to (you'd think so!).
I'll poke around this afternoon and see what comes up.
Posted 25 November 2003 - 04:56 PM
try again using normal email
neper at westol.com
Posted 26 November 2003 - 08:59 AM
The relays on the carb'd model sit just above the driver's left knee, above the fuses, in a small rack that features half-round clips that hold the circular upper section of the relay.
You will need to remove the lower panel, below the steering wheel. Three screws sit vertically into the panel above it, and three plastic screw-type "flower" holders must be removed on the lower section of the panel. Unplug an electrical block connection to have the panel fully away from the area, and reach up and left to access the relays.
The color coding matched exactly what was referenced by Skip.
To test a relay, you can swap out a known good one. Otherwise, I do not know what the resistance, etc. needs to be as I combed my manuals and there is no testing procedure for the relay.
Many thanks for you help,
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