Component Tests and General Diagnostics

INSPECTION




1. INSPECT DEFOGGER SWITCH CONTINUITY
Check that is continuity exists between terminals 2 and 6.
If continuity is not as specified, check the bulb.




2. INSPECT DEFOGGER TIMER OPERATION
a. Connect the positive (+) lead from the battery to terminal 4 and the negative (-) lead to terminal 3.
b. Connect the positive (+) lead from the battery to terminal 5 through a 3.4-W tester bulb.
c. Push the defogger switch ON, check that the indicator light and test bulb light up for 12 to 18 minutes, then the indicator light and test bulb light goes out.
If operation is not as specified, replace the switch.







3. INSPECT DEFOGGER TIMER CIRCUIT
Disconnect the connector from the switch and inspect the connector on the wire harness side, as shown in the table.
If the circuit is not as specified, replace the switch.







4. INSPECT DEFOGGER RELAY CONTINUITY
If continuity is not as specified, replace the relay.




5. w/ Heater:
INSPECT MIRROR DEFOGGER
a. Connect the positive (+) lead from the battery to terminal 4 and the negative (-) lead to terminal 6.
b. Check that the mirror becomes warm.

HINT: It takes short time for the mirror to become warm.




6. INSPECT DEFOGGER WIRE

NOTE:
- When cleaning the glass, use a soft, dry cloth, and wipe the glass in the direction of the wire. Take care not to damage the wires.
- Do not use detergents or glass cleaners with abrasive ingredients.
- When measuring voltage, wind a piece of tin foil around the top of the negative probe and press the foil against the wire with your finger, as shown.







a. Turn the ignition switch ON.
b. Turn the defogger switch ON.
c. Inspect the voltage at the center of each heat wire, as shown.






HINT: If there is approximately 10 V, the wire is broken between the center of the wire and the positive (+) end. If there is no voltage, the wire is broken between the center of the wire and ground.

d. Place the voltmeter positive (+) lead against the defogger positive (+) terminal.
e. Place the voltmeter negative (-) lead with the foil strip against the heat wire at the positive (+) terminal end and slide it toward the negative (-) terminal end.
f. The point where the voltmeter deflects from zero to several V is the place where the heat wire is broken.

HINT: If the heat wire is not broken, the voltmeter indicates 0 V at the positive (+) end of the heat wire but gradually increases to about 12 V as the meter probe is moved to the other end.




7. IF NECESSARY, REPAIR DEFOGGER WIRE
a. Clean the broken wire tips with grease, wax and silicone remover.
b. Place the masking tape along both sides of the wire to be repaired.
c. Thoroughly mix the repair agent (Dupont paste No. 4817).




d. Thoroughly mix the repair agent (Dupont paste No.4817 or equivalent).
e. Using a fine tip brush, apply a small amount to the wire.
f. After a few minutes, remove the masking tape.
g. Do not repair the defogger wire for at least 24 hours.