Toyota 4Runner: Window Defogger Wire

Toyota 4Runner Service Manual / Vehicle Exterior / Window / Glass / Window Defogger Wire

On-vehicle Inspection

ON-VEHICLE INSPECTION

PROCEDURE

1. INSPECT BACK WINDOW GLASS (DEFOGGER WIRE)

NOTICE:

When cleaning the glass, wipe the glass along the wire using a soft, dry cloth. Take care not to damage the defogger wires.
Do not use detergents or glass cleaners that have abrasive ingredients.
When measuring voltage, wrap a piece of tin foil around the tip of the negative (-) tester probe and press the foil against the wire with your finger as shown in the illustration.

Text in Illustration

*1	Defogger Wire
*2	Tin Foil
*3	Tester Probe

(a) Turn the ignition switch to ON.

(b) Turn the defogger switch on.

Standard Voltage:

Voltage	Criteria
Approx. 5 V	Wire is not broken
Approx. 10 or 0 V	Wire is broken

Text in Illustration

Center

HINT:

If there is approximately 10 V, the wire may be faulty between the center of the wire and the wire end on the battery side. If there is no voltage, the wire may be faulty between the center of the wire end and the wire end on the ground side.

(d) Place the voltmeter positive (+) lead against the defogger wire on the battery side.

(e) Place the voltmeter negative (-) lead with the foil strip against the wire on the ground side.

(f) Slide the positive (+) lead from the battery side to the ground side.

(g) The point where the voltage drops from approximately 10 V to 0 V is where the defogger wire is broken.

HINT:

If the defogger wire is not broken, the voltmeter indicates 0 V at the positive (+) end of the defogger wire and gradually increases to approximately 12 V as the meter probe moves to the other end.

Text in Illustration

*a	Ground Side
*b	Foil Strip
*c	Approximately 10 V
*d	0 V
*e	Broken Wire
*f	Battery Side

Repair

REPAIR

PROCEDURE

1. REPAIR DEFOGGER WIRE

(a) Clean the broken wire tips with grease, wax and silicone remover.

(b) Place masking tape along both sides of the wire.

DuPont paste:

No. 4817 or equivalent

Text in Illustration

*a	Repair Point
*b	Masking Tape
*c	Broken Wire

(d) Using a fine tip brush, apply a small amount of the agent to the wire.

Text in Illustration

*a	Fine Tip Brush
*b	Repair Point

(e) After a few minutes, remove the masking tape.

NOTICE:

Do not allow electricity to flow in the defogger wire for at least 24 hours.

Rear Window Defogger System does not Operate

DESCRIPTION When the back door power window is fully closed and the rear window defogger switch is turned on, a rear window defogger activation request signal is sent via the LIN communication li ...

Windshield Deicer System

...

Other materials about Toyota 4Runner:

Operation Check
OPERATION CHECK NOTICE: Perform initialization before performing the operation check. 1. CHECK AUTO OPERATION HINT: When pressing the switch for 0.3 seconds or less, the roof glass moves but auto operation does not operate. (a) Turn the ignition switch ...

Jam Protection Function does not Operate
DESCRIPTION This problem may occur in all door windows. The jam protection function operates within a specified range during the manual up or auto up operation. PROCEDURE 1. PERFORM INITIALIZATION (a) ...