Toyota CH-R Service Manual: Window Defogger Wire

Toyota CH-R Service Manual / Window / Glass / Window Defogger Wire

Precaution

PRECAUTION

IGNITION SWITCH EXPRESSIONS

(a) The type of ignition switch used on this model differs depending on the specifications of the vehicle. The expressions listed in the table below are used in this section.

Expression

Ignition Switch (Position)

Engine Switch (Condition)

Ignition Switch off

LOCK

Off (Lock)

Ignition Switch ACC

ACC

On (ACC)

Ignition Switch ON

ON

On (IG)

Engine Start

START

On (Start)

On-vehicle Inspection

ON-VEHICLE INSPECTION

PROCEDURE

1. INSPECT BACK DOOR 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.

*a

Defogger Wire

*b

Tin Foil

*c

Tester Probe

(a) Turn the ignition switch to ON.

(b) Turn the defogger switch on.

*a

Center

(c) Measure the voltage at the center of each defogger wire as shown in the illustration.

Standard Voltage:

Voltage

Criteria

Approximately 5 V

Wire is not broken

Approximately 10 or 0 V

Wire is broken

*a

Ground Side

*b

Foil Strip

*c

Approximately 10 V

*d

0 V

*e

Broken Wire

*f

Battery Side

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's positive (+) lead against the defogger wire on the battery side.

(e) Place the voltmeter's 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.

Repair

REPAIR

PROCEDURE

1. REPAIR BACK DOOR GLASS

*1

Broken Wire

*2

Masking Tape

*a

Repair Point

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

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

(c) Thoroughly mix the repair agent.

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

*1

Fine Tip Brush

*a

Repair Point

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

NOTICE:

Do not repair the defogger wire again for at least 24 hours.

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