Toyota Tundra. Manual — part 763

Fig. 197: Identifying P9 And P10 Defogger Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b. Remove the defogger relay from the engine room relay block.

c. Measure the resistance according to the value(s) in the table below.

Standard resistance

HARNESS AND CONNECTOR (REAR WINDOW DEFOGGER - DEFOGGER RELAY
AND BODY GROUND) TESTER CONNECTION SPECIFIED CONDITION

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

Tester Connection

Condition Specified Condition

P9-1 - Defogger relay terminal 3

Always

Below 1 ohms

P10-1 - Body ground

Defogger relay terminal 4 - Body ground

P9-1 - Body ground

Always

10 kohms or higher

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Windshield/WindowGlass - Tundra

7. CHECK AIR CONDITIONING AMPLIFIER (OPERATION)

a. Temporarily replace the air conditioning amplifier with a new or normally functioning one (see

AIR CONDITIONING AMPLIFIER ).

b. Check that the malfunction disappears.

OK: Malfunction disappears.

NG: REPAIR REAR WINDOW DEFOGGER (see REPAIR )

OK: END (AIR CONDITIONING AMPLIFIER IS DEFECTIVE)

WINDOW DEFOGGER WIRE (FOR CREWMAX)

ON-VEHICLE INSPECTION

1. INSPECT BACK WINDOW GLASS (DEFOGGER WIRE)

a. Turn the engine switch on (IG).

b. Turn the defogger switch on.

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

Standard voltage

BACK WINDOW GLASS (DEFOGGER WIRE) VOLTAGE REFERENCE CHART

NOTE:



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.

Fig. 198: Identifying Tester Probe, Tin Foil And Electrical Antenna
Wire
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Windshield/WindowGlass - Tundra

Fig. 199: Measuring Voltage At Center Of Defogger Wire
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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.

Fig. 200: Identifying Faulty Wire Between Center Of Wire And Wire End On Battery Side
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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.

Voltage

Criteria

Approx. 5 V

Wire is not broken

Approx. 10 or 0 V

Wire is broken

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Windshield/WindowGlass - Tundra

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

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.

Fig. 201: Placing Masking Tape Along Both Sides Of Wire
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

c. Thoroughly mix the repair agent.

DuPont paste:

No. 4817 or equivalent

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

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Windshield/WindowGlass - Tundra