TOYOTA RAV4 1996 Service Repair Manual

Fig. 9: Identifying Defogger Switch Terminals (Camry, Camry Solara, 1999 Celica, Corolla, Sienna,
Tercel & 4Runner)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
1999 Celica
1. Backprobe defogger switch terminal No. 5 with positive voltmeter lead and terminal No. 4 with negative
lead. See Fig. 9
. Ensure battery voltage exists with defogger switch in OFF position. Turn defogger
switch to ON position. Ensure indicator light is on and less than one volt exists. If voltage is not as
specified, replace switch.
2. Terminals No. 2 and 6 are for bulb illumination. Using an ohmmeter, check for continuity between switch
terminals No. 2 and 6. See Fig. 9
. Continuity should exist at all times.
3. If defogger switch is equipped with timer, ensure defogger switch turns off and battery voltage is again
present after 12-18 minutes. If defogger switch does not operate as specified, replace switch.
2000 Celica
1. Disconnect defogger switch 10-pin connector. Connect a jumper wire between battery positive and
defogger switch terminal No. 1. See Fig. 2
. Connect another jumper wire between ground and terminal
No. 3.
2. Connect a 3.4-watt test light between battery positive and defogger switch terminal No. 5. Turn defogger
switch to ON position. Test light and indicator light should illuminate on for 12-18 seconds, then turn off.
If operation is not as specified, replace defogger switch.
Corolla (With Timer)
Disconnect defogger switch 6-pin connector. Connect fused jumper between battery positive lead and terminal
No. 2 and battery negative lead to terminal No. 3 (switch side). Connect a 3.4-watt test light between terminal
No. 6 and battery voltage. See Fig. 10 . Push defogger switch to ON position. Ensure test light and indicator

1999 Toyota RAV4
1999-2000 ACCESSORIES & EQUIPMENT Rear Window & Mirror Defoggers
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light come on for 12-18 minutes and then goes out. If switch does not operate as specified, replace switch.
Fig. 10: Testing Defogger Switch With Timer (Corolla & Tercel)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Corolla (Without Timer)
Disconnect defogger switch 6-pin connector. With defogger switch on, ensure continuity exists between
terminals No. 3 and 6. See Fig. 9
. With switch off, continuity should not exist between any terminals. Check
continuity between terminals No. 1 and 4 (light bulb). Continuity should exist at all times. If continuity is not as
specified, replace switch.
ECHO (With Timer)
1. Disconnect defogger switch 4-pin connector. Connect a jumper wire between battery positive terminal
and defogger switch terminal No. 3. See Fig. 11
. Connect another jumper wire between ground and
terminal No. 4.
2. Connect a 3.4-watt test light between battery positive and terminal No. 2. Turn defogger switch to ON
position. Indicator light and test light should come on, then turn off after 12-18 minutes. Replace switch i
f
operation is not as specified.
ECHO (Without Timer)

1999 Toyota RAV4
1999-2000 ACCESSORIES & EQUIPMENT Rear Window & Mirror Defoggers
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1. Disconnect defogger switch 4-pin connector. Check continuity between defogger switch terminals No. 3
and 4. See Fig. 11
. Continuity should exist with defogger switch in ON position.
2. Check continuity between terminals No. 2 and 3 (LED circuit). Continuity should exist. With defogger
switch in OFF position, continuity should not exist between any terminals. Replace switch if continuity is
not as specified.
Fig. 11: Identifying Defogger Switch Harness Connector Terminals (ECHO)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Land Cruiser
1. Remove climate control (A/C-heater control) panel. Connect (backprobe) DVOM negative lead to
connector C9 terminal No. 22. Connect DVOM positive lead to connector C9 terminals No. 2 and 12, and
connector C7 terminal No. 8. See Fig. 12
. Turn ignition switch to ON position and measure voltage.
2. With defogger switch OFF, voltage should be about 12 volts. Turn defogger switch ON and ensure DEF
switch indicator is illuminated. Voltage should be less than one volt for about 15 minutes. After 15
minutes, defogger switch should turn off and voltage should be about 12 volts. Replace defogger switch i
f
voltage is not as specified is not as specified.

1999 Toyota RAV4
1999-2000 ACCESSORIES & EQUIPMENT Rear Window & Mirror Defoggers
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Fig. 12: Identifying Front A/C-Heater Control Assembly Terminals (Land Cruiser)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
MR2
1. Disconnect defogger switch 14-pin connector. Connect a jumper wire between battery positive and
defogger switch terminal No. 1. See Fig. 3
. Connect another jumper wire between ground and terminal
No. 4.
2. Connect a 3.4-watt test light between battery positive and terminal No. 12. Turn defogger switch on.
Indicator and test light should turn on, then turn off after 12-18 minutes. Replace defogger switch if
operation is not as specified.
RAV4
1. Remove rear defogger switch. Check continuity between specified switch terminals. See DEFOGGER
SWITCH CONTINUITY TEST (RAV4) table. See Fig. 13 . If continuity is not as specified, replace
switch.
DEFOGGER SWITCH CONTINUITY TEST (RAV4)
Switch Position(1) Terminals No.Continuity
OFFNoneNo
ON3, 5 & 8Yes
ON (Illumination)3 & 5Yes
Illumination2 & 6Yes
(1)See Fig. 13 .

1999 Toyota RAV4
1999-2000 ACCESSORIES & EQUIPMENT Rear Window & Mirror Defoggers
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Fig. 13: Identifying Defogger Switch Terminals (RAV4)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Sienna
1. Remove defogger switch. Terminals No. 1 and 4 are for bulb illumination. Check continuity between
defogger switch terminals No. 1 and 3. See Fig. 9
. Continuity should exist at all times. If continuity does
not exist, check illumination bulb.
2. Connect a jumper wire between battery positive and terminal No. 2. Connect another jumper wire
between ground and terminal No. 4. Connect a 3.4-watt test light between battery positive and terminal
No. 6. Turn defogger on. Ensure test light comes on for 12-18 minutes and then goes out. If switch does
not operate as specified, replace switch.
Tercel
1. Remove defogger switch. Terminals No. 1 and 4 are for bulb illumination. Check continuity between
defogger switch terminals No. 1 and 4. See Fig. 9
. If continuity exists, go to next step. If continuity does
not exist, check illumination bulb.
2. On models without timer, check continuity between defogger switch terminals No. 2, 3 and 6 with switch
in ON position. See Fig. 9
. With defogger switch off, continuity should not exist between any terminals.
If continuity is not as specified, replace defogger switch and retest system.
3. On models with timer, connect jumper wire between battery positive lead and defogger switch terminal
No. 2. Connect another jumper wire between ground and terminal No. 3. Connect a 3.4-watt test light
between battery positive and terminal No. 6. See Fig. 10
. Turn defogger switch to ON position. Ensure
indicator light and test light come on for 12-18 minutes and then go out. If defogger switch with timer
does not operate as specified, replace switch.
4Runner

1999 Toyota RAV4
1999-2000 ACCESSORIES & EQUIPMENT Rear Window & Mirror Defoggers
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Sunday, November 22, 2009 10:55:10 AMPage 17 © 2005 Mitchell Repair Information Company, LLC.

Disconnect defogger switch 10-pin connector. Check continuity between defogger switch terminals No. 7 and
10. See Fig. 14
. With defogger switch in ON position, continuity should exist. If continuity is not as specified,
replace integration control panel.
Fig. 14: Identifying Defogger Switch Terminals (4Runner)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
REARVIEW MIRROR DEFOGGER
1999 Avalon
Locate and disconnect outside rearview mirror 6-pin connector. Connect a jumper wire between battery positive
and terminal No. 6 (Black/Red wire). Connect another jumper wire between ground and terminal No. 4
(White/Black wire). After a short time, ensure mirror becomes warm. If mirror does not become warm, replace
mirror assembly.
2000 Avalon (With Memory)
Disconnect outside rearview mirror harness connector. Connect a jumper wire between battery positive and
rearview mirror connector terminal No. 5 (Black wire). Connect another jumper wire between ground and
rearview mirror connector terminal No. 10 (White/Black wire). After a short time, mirror should warm. If
mirror does not warm, replace mirror assembl
y.

1999 Toyota RAV4
1999-2000 ACCESSORIES & EQUIPMENT Rear Window & Mirror Defoggers
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2000 Avalon (Without Memory)
Disconnect outside rearview mirror harness connector. Connect a jumper wire between battery positive and
rearview mirror connector terminal No. 3 (Black wire). Connect another jumper wire between ground and
rearview mirror connector terminal No. 6 (White/Black wire). After a short time, mirror should warm. If mirror
does not warm, replace mirror assembly.
Camry & Camry Solara
Locate and disconnect outside rearview mirror 6-pin connector. Connect a jumper wire between battery positive
and Black/Yellow wire at mirror connector. See WIRING DIAGRAMS
. Connect another jumper wire
between ground and White/Black wire at mirror connector. After a short time, ensure mirror becomes warm. If
mirror does not become warm, replace mirror assembly.
Land Cruiser
Locate and disconnect outside rearview mirror 16-pin connector. Connect a jumper wire between battery
positive and terminal No. 5 (Red/White wire). Connect another jumper wire between ground and terminal No.
12 (White/Black wire). After a short time, ensure mirror becomes warm. If mirror does not become warm,
replace mirror assembly.
Sienna
Locate and disconnect outside rearview mirror 6-pin connector. Connect a jumper wire between battery positive
and terminal No. 6 (Black/White wire). Connect another jumper wire between ground and terminal No. 4
(White/Black wire). See WIRING DIAGRAMS
. After a short time, ensure mirror becomes warm. If mirror
does not become warm, replace mirror assembly.
4Runner
Locate and disconnect mirror 6-pin connector. Connect a jumper wire between battery positive and terminal No.
3 (Green/Black wire). Connect another jumper wire between ground and terminal No. 2 (White/Black wire).
After a short time, ensure mirror becomes warm. If mirror does not become warm, replace mirror assembly.
DEFOGGER RELAY
2000 Avalon
Check continuity between terminals No. 3 and 4. See Fig. 15 . Continuity should exist. Using jumper wires,
apply battery voltage between terminals No. 3 and 4. Check continuity between terminals No. 1 and 2.
Continuity should exist. Remove jumper wires. Continuity should not exist. Replace relay if continuity is not as
specified.

1999 Toyota RAV4
1999-2000 ACCESSORIES & EQUIPMENT Rear Window & Mirror Defoggers
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Sunday, November 22, 2009 10:55:10 AMPage 19 © 2005 Mitchell Repair Information Company, LLC.

Fig. 15: Testing Defogger Relay (2000 Avalon)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Tercel
1. Using an ohmmeter, ensure continuity exists between terminals No. 1 and 3. See Fig. 16 . Continuity
should not exist between terminals No. 2 and 4. If continuity is not as specified, replace relay.
2. Connect battery positive lead to terminal No. 1 and battery negative lead to terminal No. 3. Continuity
should exist between terminals No. 2 and 4. If operation is not as specified, replace rela
y.

1999 Toyota RAV4
1999-2000 ACCESSORIES & EQUIPMENT Rear Window & Mirror Defoggers
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Fig. 16: Testing Defogger Relay (Tercel)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Except Tercel & 2000 Avalon
1. Using an ohmmeter, ensure continuity exists between terminals No. 1 and 2. See Fig. 17 or Fig. 18 .
Continuity should not exist between terminals No. 3 and 5. If continuity is not as specified, replace relay.
2. Connect battery positive lead to terminal No. 1 and battery negative lead to terminal No. 2. Continuity
should exist between terminals No. 3 and 5. If operation is not as specified, replace rela
y.
NOTE: Testing for Land Cruiser mirror heater relay is the same as testing for defogger
relay.

1999 Toyota RAV4
1999-2000 ACCESSORIES & EQUIPMENT Rear Window & Mirror Defoggers
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Sunday, November 22, 2009 10:55:10 AMPage 21 © 2005 Mitchell Repair Information Company, LLC.

Fig. 17: Testing Defogger Relay (1999 Avalon & 1999 Celica)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Fig. 18: Testing Defogger Relay (Camry, Camry Solara, 2000 Celica, Corolla, ECHO, Land Cruiser,
MR2, Sienna & 4Runner)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
GRID FILAMENT TEST
NOTE: When testing grid wires with voltmeter, wrap aluminum foil around end of test
probe, then press foil to grid wire. This will prevent probe from damaging grid

1999 Toyota RAV4
1999-2000 ACCESSORIES & EQUIPMENT Rear Window & Mirror Defoggers
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Sunday, November 22, 2009 10:55:10 AMPage 22 © 2005 Mitchell Repair Information Company, LLC.