Component Tests and General Diagnostics

INSPECTION




1. A/C control panel assembly:
INSPECT DEFOGGER SWITCH OPERATION
a. Connect the positive (+) lead from the battery to terminal 42 and negative (-) lead to terminal 30.
b. Connect the positive (+) lead from the battery to terminal 36 through a 1.4 W test bulb.




c. Turn the defogger switch ON and check that the test bulb and indicator light turn ON, then turn OFF after approx. 15 minutes.
If operation is not as specified, proceed to inspect the A/C control assembly.







2. INSPECT DEFOGGER SWITCH CIRCUIT
Disconnect the connector from the switch and inspect the connector on wire harness side.
If the circuit is not as specified, inspect the circuits connected to other parts.







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

4. INSPECT DEFOGGER RELAY CIRCUIT




5. w/o Driving Position Memory (Driver's door):
INSPECT MIRROR DEFOGGER OPERATION
a. Connect the positive (+) lead from the battery to terminal 1 and the negative (-) lead to terminal 2.
b. Check that the mirror becomes warm.

HINT: It will take a short time for the mirror to become warm.

If the mirror does not become warm, replace the mirror assembly.




6. w/o Driving Position Memory (Passenger's door):
INSPECT MIRROR DEFOGGER OPERATION
a. Connect the positive (+) lead from the battery to terminal 6 and the negative (-) lead to terminal 4.
b. Check that the mirror becomes warm.

HINT: It will take a short time for the mirror to become warm.

If the mirror does not become warm, replace the mirror assembly.




7. w/ Driving Position Memory:
INSPECT MIRROR DEFOGGER OPERATION
a. Connect the positive (+) lead from the battery to terminal 2 and the negative (-) lead to terminal 1.
b. Check that the mirror becomes warm.

HINT: It will take a short time for the mirror to become warm.

If the mirror does not become warm, replace the mirror assembly.







8. w/o Driving Position Memory (Driver's door):
INSPECT MIRROR DEFOGGER CIRCUIT
Disconnect the connector from the outside mirror and inspect the connector on the wire harness side.
If the circuit is not as specified, inspect the circuits connected to other parts.







9. w/o Driving Position Memory (Passenger's door):
INSPECT MIRROR DEFOGGER CIRCUIT
Disconnect the connector from the outside mirror and inspect the connector on the wire harness side.
If the circuit is not as specified, inspect the circuits connected to other parts.







10. w/ Driving Position Memory:
INSPECT MIRROR DEFOGGER CIRCUIT
Disconnect the connector from the outside mirror and inspect the connector on the wire harness side.
If the circuit is not as specified, inspect the circuits connected to other parts.




11. 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.

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 voltage increases to approx. 12 V as the meter probe moves to the other end.




12. 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 for repair.
c. Thoroughly mix the repair agent (Dupont paste No. 4817).




d. Using a fine tip brush, apply a small amount of the agent to the wire.
e. After a few minutes, remove the masking tape.
f. Do not repair the defogger wire for at least 24 hours.