warning light TOYOTA RAV4 1996 Service Workshop Manual

least 20 seconds. Turn ignition switch to ACC or ON position. Wait at least 20 seconds. Retrieve DTCs.
See RETRIEVING CODES
under DIAGNOSIS & TESTING. If DTC 73/B0135 is not displayed,
system is functioning properly at this time. Check for intermittent fault. See AIR BAG WARNING
LIGHT INTERMITTENT . If DTC 73/B0135 is displayed, replace driver-side seat belt pretensioner.
DTC 74/B0136: OPEN IN DRIVER-SIDE SEAT BELT PRETENSIONER SQUIB CIRCUIT
Description
The driver-side seat belt pretensioner squib circuit consists of the air bag sensor assembly and driver-side seat
belt pretensioner. The squib circuit causes the driver-side seat belt pretensioner to deploy when deployment
conditions are satisfied.
Possible Causes
DTC 74/B0136 could be caused by an open in Yellow/Black (circuit PL+) or Yellow (circuit PL-) wires in
driver-side seat belt pretensioner squib circuit, driver-side seat belt pretensioner squib malfunction or air bag
sensor assembly malfunction.
Diagnostic Procedure
1. Disable air bag system. See DISABLING SYSTEM under DISABLING & ACTIVATING AIR BAG
SYSTEM.
2. Measure resistance between Yellow/Black wire (circuit PL+) and Yellow wire (circuit PL-) of air bag
sensor assembly side of driver-side seat belt pretensioner squib harness connector. See WIRING
DIAGRAMS . If resistance is more than one ohm, repair or replace harness or connector between seat
belt pretensioner and air bag sensor assembly. If resistance is less than one ohm, go to next step.
3. Reconnect air bag sensor assembly connector C19 to air bag sensor assembly. Connect jumper wire
between Yellow/Black wire (circuit PL+) and Yellow wire (circuit PL-) of air bag sensor assembly side
of driver-side seat belt pretensioner squib harness connector. Connect negative battery cable. Wait at least
2 seconds. Turn ignition switch to ACC or ON position. Wait at least 20 seconds. Clear DTCs. See
CLEARING CODES
under DIAGNOSIS & TESTING. Turn ignition switch to LOCK position. Wait at
least 20 seconds. Turn ignition switch to ACC or ON position. Wait at least 20 seconds. Retrieve DTCs.
See RETRIEVING CODES
under DIAGNOSIS & TESTING. If DTC 74/B0136 is not displayed, go to
next step. If DTC 74/B0136 is displayed, replace air bag sensor assembly.
4. Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds.
Reconnect driver-side seat belt pretensioner connector. Connect negative battery cable. Wait at least 2
seconds. Turn ignition switch to ACC or ON position. Wait at least 20 seconds. Clear DTCs. See
CLEARING CODES
under DIAGNOSIS & TESTING. Turn ignition switch to LOCK position. Wait at
least 20 seconds. Turn ignition switch to ACC or ON position. Wait at least 20 seconds. Retrieve DTCs.
See RETRIEVING CODES
under DIAGNOSIS & TESTING. If DTC 74/B0136 is not displayed,
system is functioning properly at this time. Check for intermittent fault. See AIR BAG WARNING
LIGHT INTERMITTENT . If DTC 74/B0136 is displayed, replace driver-side seat belt pretensioner. NOTE: During testing, if DTCs other than DTC 74/B0136 are displayed, disregard them.

1999 Toyota RAV4
AIR BAG RESTRAINT SYSTEM 1999 Toyota
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1999-2000 DRIVE AXLES
Center Differential Lock
DESCRIPTION & OPERATION
CENTER DIFFERENTIAL LOCK SYSTEM
The center differential lock system enables vehicle to have enough traction to move when one of the 4 wheels,
both front wheels or both rear wheels are off the ground or on a slippery surface.
Center differential lock system consists of control switch, differential lock control solenoids, differential lock
actuator, indicator switch, and integration relay. See Fig. 1
.
With control switch off, the center differential lock indicator light on instrument panel is off, along with
vacuum switching valves No. 1 and 2. Vacuum switching valve No. 1 draws vacuum from vacuum tank to
chamber "A" of the vacuum actuator. Vacuum switching valve No. 2 draws atmospheric air to chamber "B".
Under these conditions, the vacuum actuator diaphragm moves the rod, which moves the locking sleeve shift
fork and shaft, which causes the locking sleeve to disengage from the case. See Fig. 2
. During this time, the
center differential warning buzzer will sound. When the locking sleeve is completely disengaged, the warning
buzzer will turn off (free position).

1999 Toyota RAV4
1999-2000 DRIVE AXLES Center Differential Lock

1999 Toyota RAV4
1999-2000 DRIVE AXLES Center Differential Lock
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Fig. 2: Center Differential Lock System Schematic
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
TROUBLE SHOOTING
CENTER DIFFERENTIAL LOCK SYSTEM
1. Raise vehicle off ground so all 4 wheels can rotate. Apply parking brake and start engine. Turn center
differential lock system on.
2. Depress clutch pedal and shift into 2nd gear. With engine idling, gradually engage the clutch and ensure
engine stalls.
3. With parking brake and engine on, turn center differential lock system off. Depress clutch pedal and shift
into 2nd gear. With engine idling, gradually engage the clutch and ensure front wheels rotate.
CENTER DIFFERENTIAL LOCK INDICATOR LIGHT
Turn ignition on. Ensure indicator light is off with center differential lock system off, and on with system on.
WARNING BUZZER
1. Start en
gine and ensure warning buzzer does not sound when center differential lock switch is turned on.
NOTE: If the buzzer continues to sound, point the wheels straight ahead, accelerate or
decelerate, or drive the vehicle in reverse to stop the buzzer.

1999 Toyota RAV4
1999-2000 DRIVE AXLES Center Differential Lock
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1999-2000 STARTING & CHARGING SYSTEMS
Generators & Regulators
DESCRIPTION & OPERATION
The generator is a small, high RPM, high performance type with an internal Integrated Circuit (IC) voltage
regulator which controls charging system voltage. A transistor inside IC regulator controls generator voltage
output to maintain a constant voltage. Charging system voltage is maintained within an operating range of 13.2-
15.1 volts. See GENERATOR REGULATED OUTPUT SPECIFICATIONS
table under NO-LOAD TEST
under ON-VEHICLE TESTING for specific model operating ranges. For generator rated ampere output, see
GENERATOR RATED AMPERE OUTPUT SPECIFICATIONS
table.
When ignition is turned on, battery voltage flows from generator terminal "L" through IC regulator to ground,
causing discharge warning light to come on. When engine starts, generator RPM increases, which increases
generator output voltage. When generator output voltage is greater than battery voltage, voltage to recharge
battery flows from terminal "B". At the same time, voltage at terminal "L" increases and the potential difference
between battery and terminal "L" ceases, causing discharge warning light to go off.
GENERATOR RATED AMPERE OUTPUT SPECIFICATIONS
ADJUSTMENTS
NOTE: This article also applies to Lexus LX470. For Lexus LX470, refer to Land
Cruiser, unless otherwise indicated.
ApplicationAmperes
Avalon, Camry, Camry Solara & Corolla80
Celica
A/T80
M/T70
Land Cruiser80 Or 100
RAV490
Sienna100
Tacoma
4-Cylinder70
V690 Or 100
Tundra
V670 Or 80
V870 Or 100
4Runner
4-Cylinder70
V660

1999 Toyota RAV4
1999-2000 STARTING & CHARGING SYSTEMS Generators & Regulators

1999 Toyota RAV4
1999-2000 STARTING & CHARGING SYSTEMS Generators & Regulators
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1999 ACCESSORIES & EQUIPMENT
Cruise Control Systems - RAV4
DESCRIPTION
Cruise control system consists of cruise control Electronic Control Unit (ECU), actuator and cables, speed
sensor, cruise control switch, stoplight switch, clutch switch (M/T), park/neutral position switch (A/T) and
related wirin
g. See Fig. 1 . The system allows vehicle to cruise at a desired speed greater than 25 MPH. WARNING:Deactivate air bag system before performing any service operation. See
AIR BAG RESTRAINT SYSTEMS article. DO NOT apply electrical power to
any component on steering column without first deactivating air bag
system. Air bag may deploy.

1999 Toyota RAV4
1999 ACCESSORIES & EQUIPMENT Cruise Control Systems - RAV4

1999 Toyota RAV4
1999 ACCESSORIES & EQUIPMENT Cruise Control Systems - RAV4
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DIAGNOSIS, perform next test listed.
2. Check wiring harness and connectors between cruise control ECU and DLC No. 1, and between DLC No.
1 and ground. Repair as necessary and retest system. If harness and connectors are okay, replace cruise
control ECU and retest system.
Fig. 2: Identifying DLC No. 1 Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
SELF-DIAGNOSTIC SYSTEM
DIAGNOSTIC PROCEDURE
When cruise control functions are canceled, CRUISE indicator light will blink 5 times, indicating 2-digit
trouble code(s) are stored in cruise control ECU memory. Retrieve trouble code(s). See RETRIEVING
TROUBLE CODES . Perform appropriate DTC test under DIAGNOSTIC TESTS . See DIAGNOSTIC
WARNING:Deactivate air bag system before performing any service operation. See
AIR BAG RESTRAINT SYSTEMS article. DO NOT apply electrical power to
any component on steering column without first deactivating air bag
system. Air bag may deploy.

1999 Toyota RAV4
1999 ACCESSORIES & EQUIPMENT Cruise Control Systems - RAV4
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SWITCHES
SWITCHES
MISCELLANEOUS
MISCELLANEOUS
VSV (EVAP)On left side of engine compartment. See Fig. 2 .
VSV (Vapor Pressure Sensor)On left side of engine compartment. See Fig. 2 .
ComponentComponent Location
A/C Triple Pressure Switch (A/C Dual & Single
Pressure Switch)On left front corner of engine compartment. See Fig. 3 .
A/C Water Temperature SwitchOn center front engine compartment, behind front
bumper. See Fig. 3
.
A/T Fluid Temperature SwitchOn left front of engine compartment, on transmission.
See Fig. 3
.
Back-Up Light Switch (M/T)On left side of engine compartment, on transmission.
See Fig. 3
.
Brake Fluid Level Warning SwitchOn left side of engine compartment, near strut tower.
See Fig. 3
.
Center Differential Lock Warning Buzzer
SwitchOn center of engine compartment, near center
differential lock. See Fig. 3
.
Clutch Start Switch (M/T)Under left side of dash, at clutch pedal bracket.
Cruise Control Clutch SwitchUnder left side of dash, at clutch pedal bracket.
Oil Pressure SwitchOn lower left side of engine. See Fig. 2 .
Park/Neutral Position Switch (A/T)On lower left front side of engine compartment, on
transmission. See Fig. 2
.
Parking Brake SwitchUnder console, on parking brake assembly.
Retractor SwitchIn driver's side seat belt buckle.
Stoplight SwitchUnder left side of dash, at brake pedal bracket.
ComponentComponent Location
Blower ResistorBehind right side of dash.
Data Link Connector (DLC) No. 1On right side, middle of engine compartment. See Fig. 3 .
Data Link Connector (DLC) No. 3Under center, left side of dash.
Ignition Coil & Ignitor No. 1On left rear of engine. See Fig. 2 .
Ignition Coil & Ignitor No. 2On left rear of engine.
Junction Connectors No. 1 & 2Behind left kick panel.
Junction Connectors No. 3 & 4Behind combination meter assembly.
Junction Connector No. 5Under center top of dash.
Junction Connectors No. 6 & 7Behind center of dash.
Junction Connectors No. 8, 9 & 10Behind right side of dash.

1999 Toyota RAV4
1999 TOYOTA RAV4
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1999-2000 ACCESSORIES & EQUIPMENT
Instrument Panels - Trucks
DESCRIPTION & OPERATION
GAUGES
Standard instrument clusters contain fuel and temperature gauges with telltale warning lights. Some optional
instrument panels are equipped with a tachometer, oil pressure gauge and voltmeter. Gauge internal operating
components use either a 2-terminal bimetallic strip type or a 3-terminal coil type. The 2-terminal type gauges
are generally used on clusters without tachometers.
SWITCHES
All models contain hazard warning switch on instrument panel. All models use a combination switch for
headlight, turn signal, wiper/washer, and cruise control switches. Combination switch is mounted on steering
column. For testing and/or removal and installation procedures for combination switch components, see
appropriate STEERING COLUMN SWITCHES article.
COMPONENT TESTS
A/T OIL TEMPERATURE SWITCH
RAV4
1. Turn ignition switch to OFF position. Disconnect A/T oil temperature switch 1-pin connector. Switch is
located on side of transaxle, near park/neutral position switch. Remove A/T oil temperature switch. Place
probe end of switch and thermometer in a container of water.
2. Connect an ohmmeter between switch terminal and switch body. Heat water and check for continuity.
With temperature at 284-302°F (140-150°C), continuity should exist. If continuity does not exist, replace
switch.
A/T OIL TEMPERATURE WARNING LIGHT
RAV4
Disconnect A/T oil temperature switch connector. Switch is located on side of transaxle, near park/neutral
position switch. Using a jumper wire, connect switch connector terminal to ground. Turn ignition switch to ON
position. A/T oil temperature warning light should be on. If warning light is off, check bulb and wiring harness.
Repair as necessary. WARNING:Deactivate air bag system before performing any service operation. See
AIR BAG RESTRAINT SYSTEMS article. DO NOT apply electrical power to
any component on steering column without first deactivating air bag
system. Air bag may deploy.

1999 Toyota RAV4
1999-2000 ACCESSORIES & EQUIPMENT Instrument Panels - Trucks

1999 Toyota RAV4
1999-2000 ACCESSORIES & EQUIPMENT Instrument Panels - Trucks
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BRAKE FLUID LEVEL SWITCH
Remove cap and strainer from brake fluid reservoir. Disconnect brake fluid level switch connector. Check for
continuity between brake fluid level switch terminals. With reservoir full (float up), continuity should not exist.
With reservoir empty (float down), continuity should exist. If continuity is not as specified, replace brake fluid
level switch.
BRAKE WARNING LIGHT
Disconnect brake fluid warning switch connector. Release parking brake. Using a jumper wire, connect brake
fluid warning switch connector terminals together. Turn ignition switch to ON position. Brake warning light
should be on. If brake warning light is off, check bulb and wiring harness. Repair as necessary.
BULB CHECK RELAY
Tacoma & 4Runner
1. Bulb check relay is located on back of instrument cluster. See Fig. 5 . Turn ignition switch to OFF
position. Remove instrument cluster. Using a jumper wire, connect negative battery terminal to bulb
check relay terminal "B". See Fig. 1
.
2. Using another jumper wire, connect a 12-volt, 1.4-watt test light between positive battery terminal and
bulb check relay terminal "C". Test light should be off. Connect another jumper wire between positive
battery terminal and bulb check relay terminal "A". Test light should be on. If test light does not
illuminate as specified, replace relay.

1999 Toyota RAV4
1999-2000 ACCESSORIES & EQUIPMENT Instrument Panels - Trucks
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Fig. 8: Identifying Fuel & Temperature Gauge Terminals (4Runner)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
FUEL GAUGE & WARNING LIGHT

1999 Toyota RAV4
1999-2000 ACCESSORIES & EQUIPMENT Instrument Panels - Trucks
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