warning light TOYOTA RAV4 1996 Service Repair Manual

1999-2000 BRAKES
Anti-Lock - RAV4
DESCRIPTION
Anti-Lock Brake System (ABS) consists of hydraulic actuator, solenoids, pump motor, ABS Electronic Control
Unit (ECU), relays, deceleration sensor (4WD) and wheel speed sensors. See Fig. 1
.
An ABS warning light is located on the instrument cluster. Warning light comes on for 3 seconds as a bulb test
when ignition is turned on. A primary check is performed after each engine start and initial vehicle speed
exceeds 6 MPH. An actuator noise is heard as vehicle is started or as speed exceeds 6 MPH. This is normal.
Anti-lock systems remains active until vehicle speed drops below 3 MPH.

1999 Toyota RAV4
1999-2000 BRAKES Anti-Lock - RAV4

1999 Toyota RAV4
1999-2000 BRAKES Anti-Lock - RAV4
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If cause of faulty operation cannot be located with basic diagnosis, ABS electronic control system must be
checked. See DIAGNOSIS & TESTING
.
When ignition is turned on, ABS warning light should come on, then go out after 3 seconds. If ABS warning
light does not operate as specified, go to ABS WARNING LIGHT under DIAGNOSIS & TESTING
.
DIAGNOSIS & TESTING
RETRIEVING DIAGNOSTIC TROUBLE CODES
ABS Warning Light Diagnostics
1. Ensure battery voltage is 12 volts. Turn ignition switch to ON position. ABS warning light should
illuminate, then go out after 3 seconds. If ABS warning light does not illuminate, check fuse, bulb, and
wiring harness. See ABS WARNING LIGHT
.
2. Remove short pin from DLC1. DLC1 is located in engine compartment, on left side of engine. See Fig.
2 . Using a jumper wire, jumper DLC1 terminals Tc and E1 . If a malfunction is detected, ABS warning
light will begin to flash a 2-digit Diagnostic Trouble Code (DTC). First number of blinks will equal first
digit in DTC. After a 1.5-second pause, second number of blinks will equal second digit in DTC.
3. If 2 or more DTCs are stored, there will be a 2.5-second pause between each DTC. After all DTCs are
flashed, there will be a 4 second pause and all DTCs will repeat. If ABS system is functioning properly,
ABS warning light will blink 2 times per second. For code definitions, see DTC DEFINITIONS
. For
DTC diagnosis, see DIAGNOSTIC TESTS
.
4. After replacing or repairing components, clear DTCs. If battery cables were disconnected during repairs,
all DTCs will be erased. If battery cables were not disconnected during repairs, see CLEARING DTCS
.
DTC DEFINITIONS NOTE: DO NOT start engine when retrieving DTCs.
NOTE: Speed sensor diagnostics and code retrieval use different DLC1 terminals to
access DTCs. If a speed sensor or speed sensor circuit problem is suspected,
see SPEED SENSOR DIAGNOSTICS
.
DTCCircuit/Malfunction
ABS-Related DTCs (1)
11 Open In ABS Solenoid Relay Circuit
12 Short In ABS Solenoid Relay Circuit
13 Open In ABS Pump Motor Relay Circuit
14 Short In ABS Pump Motor Relay Circuit
21 Open/Shorted RF Solenoid, Defective ABS
Actuator
22 Open/Shorted LF Solenoid, Defective ABS
Actuator

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1999-2000 BRAKES Anti-Lock - RAV4
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Fig. 2: Identifying DLC1 Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
CLEARING DIAGNOSTIC TROUBLE CODES
Remove short pin from DLC1. DLC1 is located in engine compartment on left side of engine. See Fig. 2
. Using
a jumper wire, jumper DLC1 terminals Tc and E
1 . Turn ignition on. With vehicle stopped, depress brake pedal
8 or more times within 5 seconds. DTCs are now erased. Ensure ABS warning light blinks 2 times per second.
Remove jumper wire. Reconnect short pin.
SPEED SENSOR DIAGNOSTICS
1. Ensure battery voltage exists. Turn ignition on. Ensure ABS warning light illuminates, then goes out after
about 3 seconds. If ABS warning light does not illuminate, check fuse, bulb and wiring harness. See ABS
WARNING LIGHT .
2. Turn ignition off. Using a jumper wire, jumper terminals Ts and E
1 of DLC1. DLC1 is located in engine
compartment on left side of en
gine. See Fig. 2. Start engine. Ensure ABS warning light blinks 4 times
.SENSOR DIAGNOSTICS

NOTE: While diagnosing speed sensors, brake system functions as a conventional
system.

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1999-2000 BRAKES Anti-Lock - RAV4
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per second. If ABS light does not blink, go to ABS WARNING LIGHT. If ABS warning light blinks,
go to next step.
3. Drive vehicle straight ahead above 28 MPH for several seconds. Stop vehicle. Jumper terminals Tc and
E
1 of DLC1. See Fig. 2 . If all sensors are okay, a normal DTC is displayed (ABS warning light blinks 2
times a second). If a malfunction is detected, ABS warning light will begin to flash a 2-digit DTC. First
number of blinks will equal first digit in a DTC. After a 1.5-second pause, second number of blinks will
equal second digit in a DTC.
4. If 2 or more DTCs are stored, there will be a 2.5-second pause between each DTC. After all DTCs are
flashed, there will be a 4 second pause and all DTCs will repeat.
5. Record DTCs. Turn ignition off. Repair as necessary. See DTC DEFINITIONS
. Remove jumper wire
from DLC1. Clear DTCs. See CLEARING DTCS
.
ABS WARNING LIGHT
Circuit Description
If ABS ECU detects a system malfunction, ABS ECU illuminates ABS warning light while at the same time
prohibiting ABS control. At this time, ABS ECU records a DTC in memory. After removing short pin from
DLC1, connecting terminals Tc and E
1 of DLC1 causes ABS warning light to blink and output a DTC. See Fig.
2 .
Diagnostic Procedure
1. If ABS warning light stays on, go to step 3 . If ABS warning light does not illuminate, check fuse, light
bulb and wiring. Repair or replace as necessary. If bulb is okay, diagnose combination meter (instrument
panel). See appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. If no
problems were found, go to next step.
2. Check ABS control relay. See SOLENOID RELAY SECTION
under ABS CONTROL RELAY under
COMPONENT TESTS. Replace as necessary. If ABS control relay is okay, go to next step.
3. Retrieve DTCs. See RETRIEVING DTCS
under DIAGNOSIS & TESTING. If DTC is present, perform
appropriate test under DIAGNOSTIC TESTS. If DTC is not present, and ABS warning light goes off
when short pin is removed, go to next step. If ABS warning light does not turn off, check for short circuit
in wiring harness between ABS warning light, DLC1 and ABS ECU. Repair as necessary. See WIRING
DIAGRAMS .
4. Check ABS control relay. See SOLENOID RELAY SECTION
under ABS CONTROL RELAY under
COMPONENT TESTS. Replace relay as necessary. If relay is okay, check for short circuit in wiring
harness between DLC1 and ABS control relay. Repair as necessary. See WIRING DIAGRAMS
.
TC TERMINAL
Circuit Description
Connecting terminals Tc and E1 of DLC1 causes ABS warning light to blink and output a DTC. See Fig. 2 .
Diagnostic Procedure

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Turn ignition on. Measure voltage between terminals Tc and E1of DLC1. If voltage is 10-14 volts, circuit is
okay. If ABS warning light does not blink even after terminals are connected, malfunction may exist in ABS
ECU. If voltage is not 10-14 volts, check for open or short circuit in wiring harness between ABS actuator and
DLC1, or between ground and DLC1. See WIRING DIAGRAMS
. Repair as necessary. If wiring harness is
okay, replace ABS ECU.
TS TERMINAL
Circuit Description
Sensor check circuit detects abnormalities in speed sensor signal which cannot be detected when checking for
DTCs. Connecting terminals Ts and E
1 of DLC1 in engine compartment starts DTC check. See Fig. 2 .
Diagnostic Procedure
Turn ignition on. Measure voltage between terminals Ts and E1 of DLC1. If voltage is 10-14 volts, circuit is
okay. If ABS warning light does not blink even after terminals are connected, malfunction may exist in ABS
ECU. If voltage is not 10-14 volts, check for open or short circuit in wiring harness between ABS ECU and
DLC1, or between ground and DLC1. See WIRING DIAGRAMS
. Repair as necessary. If wiring harness is
okay, replace ABS ECU.
ABS ECU PIN VOLTAGES
ABS circuits and harness can be tested by backprobing ABS ECU connectors and comparing measured voltages
with ABS ECU standard values chart. See Fig. 3
.

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SYMPTOM TESTS
ABS LIGHT ON: ABS ECU MALFUNCTION
Circuit Description
This circuit is the power source for ABS ECU and actuator.
DTC Detecting Condition
If voltage at ABS ECU terminal IG1 remains more than 17 volts, this DTC will set. If a malfunction occurs in
power source circuit, ABS ECU cuts off current to ABS control relay and prohibits ABS control.
Diagnostic Procedure
1. Retrieve DTCs. See RETRIEVING DTCS under DIAGNOSIS & TESTING. If DTC is output using
ABS warning light, perform appropriate test under DIAGNOSTIC TESTS
. If ABS warning light does
not operate normally, go to next step. If ABS warning light operates normally (lights blink 2 times per
second and no DTCs are present), check ABS control (solenoid) relay. See SOLENOID RELAY
SECTION under ABS CONTROL RELAY under COMPONENT TESTS. Check for short circuit in
ABS Inoperative (1)
Is OutputCODES
IG Power Source CircuitDTC 41
Speed Sensor CircuitDTCS 31, 32, 33 & 34: SPEED SENSOR
CIRCUIT
Check ABS Actuator (2) ACTUATOR CHECK
ABS Operates
Intermittently
(1)
Check DTC, Confirm Normal DTC
Is OutputRETRIEVING DIAGNOSTIC TROUBLE
CODES
Speed Sensor CircuitDTCS 31, 32, 33 & 34: SPEED SENSOR
CIRCUIT
Stoplight Switch CircuitDTC 49: STOPLIGHT SWITCH
CIRCUIT
Check ABS Actuator (2) ACTUATOR CHECK
ABS Warning Light
AbnormalABS Warning Light CircuitABS WARNING LIGHT
ABS ECUABS LIGHT ON: ABS ECU
MALFUNCTION
Unable To Perform
DTC Check
(1)
ABS Warning Light CircuitABS WARNING LIGHT
Tc Terminal CircuitTc TERMINAL
Unable To Do Speed
Sensor DiagnosticsTs Terminal CircuitTs TERMINAL
ABS ECUABS LIGHT ON: ABS ECU
MALFUNCTION
(1)If all circuits check okay and problem is still occurring, replace ABS ECU.
(2)If actuator check is abnormal, check for hydraulic leakage, perform visual inspection.

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1999-2000 BRAKES Anti-Lock - RAV4
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wiring harness between ABS control relay and DLC1. Repair or replace as necessary. See WIRING
DIAGRAMS .
2. If ABS warning light is on, go to next step. If ABS warning light is off, check for open or short circuit in
wiring harness between ECU-IG fuse and ABS ECU. Repair as necessary. See WIRING DIAGRAMS
.
3. Start engine and check charging system voltage. If voltage is 10-16 volts, go to next step. If voltage is not
10-16 volts, diagnose charging system. Repair as necessary.
4. Turn ignition off. Disconnect appropriate ABS ECU connector supporting IG1 terminal. See Fig. 3
. Turn
ignition switch to ON position. Ensure ABS warning light turns off. If light turns off, replace ABS ECU.
If light does not turn off, check for short circuit in wiring harness between combination meter (instrument
panel) and ABS ECU, or between combination meter and DLC1. Repair as necessary. See WIRING
DIAGRAMS .
DIAGNOSTIC TESTS
DTC 11 & DTC 12: ABS CONTROL (SOLENOID) RELAY CIRCUIT
Circuit Description
This relay supplies power to each ABS solenoid. After ignition switch is turned to ON position, if initial check
is okay, this relay turns on. If malfunction occurs in ABS control relay circuit, ABS ECU cuts off current to
ABS control relay and prohibits ABS control.
DTC Detecting Condition
Detection of following conditions may set DTC 11 or DTC 12 if condition occurs for .2 seconds or more:
If voltage at ABS control relay connector terminal A9-1 is less than 1.5 volts and voltage at connector
terminal A9-5 is zero volts, DTC 11 may set.
If voltage at ABS control relay connector terminal A9-1 is 10-14 volts and voltage at connector terminal
A9-5 is 10-14 volts, DTC 12 may set.
Diagnostic Procedure
1. Disconnect ABS control relay 6-pin connector A9, located in engine compartment at front of vehicle. See
Fig. 1
. Measure voltage between connector terminals A9-2 and A9-6. See Fig. 4 . If voltage is 10-14
volts, go to next step. If voltage is not 10-14 volts, repair wiring harness between ground, battery and
ABS control relay.
2. Measure resistance between ABS control relay terminal A9-5 and appropriate ABS ECU terminals. See
ABS ECU
-TO-ACTUATOR CIRCUIT IDENTIFICATION/RESISTANCE VALUES . See Fig. 3 .
If resistance on every circuit is between 26-40 ohms, go to next step. If resistance is not as specified,
check for open or short circuit in appropriate wiring between ABS control relay, ABS actuator and ABS
ECU. See WIRING DIAGRAMS
. Repair as necessary. If wiring is okay, replace ABS actuator.
ABS ECU-TO-ACTUATOR CIRCUIT IDENTIFICATION/RESISTANCE VALUES
CircuitABS ECU
Connector/TerminalWire Color

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DTC 44: DECELERATION SENSOR CIRCUIT (4WD MODELS ONLY)
Circuit Description
Deceleration sensor detects vehicle deceleration. Sensor signal is used in ABS control. If sensor functions
abnormally, ABS warning light will illuminate, but ABS will still operate.
DTC Detecting Conditions
Detection of the following conditions may set DTC 44:
On 2-door models, with ignition switch in ON position, and output voltage of terminals GL1 or GL2
remains 0.5 volts or less or 4.5 volts or more for more than one minute, DTC 44 will set.
On 2-door models, at vehicle speed of zero MPH, if outputs of terminals GL1 and GL2 remain
abnormally different for one minute or more, DTC 44 will set.
On 2-door models, if after ignition switch is turned to ON position, voltage at terminal VGS is 4.4 volts
or less, or 5.5 volts or more, and voltage continues for 1.2 seconds or more, DTC 44 will set.
On 4-door models, if an open or short circuit is detected in circuits GS1 or GS2 for one second, DTC 44
will set.
On 4-door models, after ignition switch is turned to ON position, a test signal is output at terminal GST.
During this time, if a trouble signal is detected for 0.5 seconds, DTC 44 will set.
Diagnostic Procedure
1. Check for open or short circuit in wiring harness between deceleration sensor and ABS ECU. Repair as
necessary. See WIRING DIAGRAMS
. If wiring harness is okay, go to next step.
2. Turn ignition off. Remove ABS ECU. Do not disconnect electrical connectors. Disconnect deceleration
sensor connector. Turn ignition switch to ON position. On 4-door models, go to next step. On 2-door
models, measure voltage between ground and terminals GL1, GL2 and VGS at ABS ECU harness
connector. See Fig. 3
. Voltage should be 0.5-4.5 volts at terminals GL1 and GL2. Voltage should be 4.5-
5.5 volts at terminal VGS. If voltage is as specified, check deceleration sensor. See DECELERATION
SENSOR CHECK under COMPONENT TESTS. If voltage is not as specified, replace ABS ECU.
3. On 4-door models, measure voltage between ground and terminals GS1, GS2 and GST at ABS ECU
harness connector. See Fig. 3
. Voltage should be 4-6 volts or 7-11 volts at terminal GS1. Voltage should
be 4-6 volts at terminal GS2. Voltage at terminal GST should pulse from 12 volts for 0.5 seconds to zero
volts, with a 1.5 second pause between pulses. If voltage is as specified, check deceleration sensor. See
DECELERATION SENSOR CHECK
under COMPONENT TESTS. If voltage is not as specified,
replace ABS ECU.
DTC 49: STOPLIGHT SWITCH
DTC Detection Condition
Detection of the following condition may set DTC 49:
Voltage at ABS ECU terminal STP is 1.2-1.7 volts and continues for 0.3 seconds or more.

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1. Check charging system voltage. Ensure 10-14 volts is present. If charging system voltage is okay, go to
next step. If charging system voltage is not okay, check and repair charging system.
2. Turn ignition switch to ON position. Ensure ABS warning light comes on, then goes out after 3 seconds.
If ABS warning light does not illuminate, check fuse, bulb, and wiring harness. See ABS WARNING
LIGHT under DIAGNOSIS & TESTING. Turn ignition off.
3. Using a jumper wire, jumper terminals Ts and E
1 of DLC1. DLC1 is located in engine compartment on
left side of engine. See Fig. 2
. Ensure ABS warning light blinks 4 times per second. If ABS light does
not blink, go to ABS WARNING LIGHT
under DIAGNOSIS & TESTING. If ABS warning light
blinks, go to next step.
4. Using a floor jack, slowly jack up rear of vehicle. On vehicles with 215/70R16 tires, raise vehicle to a
height of 25.59-27.95" (650-710 mm). On vehicles with 235/60R16 tires, raise vehicle to a height of
26.38-28.74" (670-730 mm). If ABS warning light illuminates at specified height, check deceleration
sensor installation. If installation is okay, replace deceleration sensor. Lower vehicle.
5. Using a floor jack, slowly jack up front of vehicle. On vehicles with 215/70R16 tires, raise vehicle to a
height of 21.20-23.56" (550-610 mm). On vehicles with 235/60R16 tires, raise vehicle to a height of
22.44-24.80" (570-630 mm). If ABS warning light illuminates at specified height, check deceleration
sensor installation. If installation is okay, replace deceleration sensor. Lower vehicle.
6. Drive vehicle straight ahead at speed of 13 MPH or more. Lightly depress brake pedal. Ensure ABS
warning light pattern is normal (light blinks 4 times per second).
7. While driving vehicle straight ahead at speed of 13 MPH or more, moderately depress brake pedal.
Ensure ABS warning light illuminates in a solid pattern (light does not blink) while braking.
8. While driving vehicle straight ahead at speed of 13 MPH or more, firmly depress brake pedal. Ensure
ABS warning light illumination pattern changes from a solid pattern (light does not blink) to a normal
pattern (light blinks 4 times per second), then back to a solid pattern while braking.
9. If ABS warning light does not illuminate as described in steps 6 -8 , check deceleration sensor
installation. If installation is okay, replace deceleration sensor. Stop vehicle and turn ignition off. Remove
jumper wire from DLC1.
REMOVAL & INSTALLATION
ACTUATOR
Removal & Installation
Turn ignition off. Disconnect brakelines attached to actuator. Remove power steering hose retaining bracket
bolt and power steering reservoir. Disconnect actuator electrical connectors. Remove bolts, nuts and washers.
Remove actuator assembly. Remove actuator from actuator bracket. Remove cushions and holders from NOTE: When measuring vehicle height in following steps, measure at center of
lower body of vehicle.
WARNING:Hydraulic system may be under high pressure. Use caution when opening
hydraulic system.

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The air bag sensor, which deploys air bags, contains a back-up power supply, safing sensor and diagnostic code
memory. Spiral cable (clockspring) maintains a complete circuit to the steering wheel pad.
SYSTEM OPERATION CHECK
Turn ignition switch to ACC or ON position. Air bag warning light in instrument cluster should come on for
about 6 seconds and then go out. If light does not respond as specified, SRS is malfunctioning and needs repair.
See DIAGNOSIS
.
SERVICE PRECAUTIONS
Observe the following precautions when working on SRS:
Before servicing any SRS or steering column component, disable SRS. See DISABLING &
ACTIVATING AIR BAG SYSTEM . Failure to disable system could result in accidental air bag
deployment and personal injury.
When diagnosing SRS, always check for diagnostic codes before disconnecting battery.
After ignition switch is turned to LOCK position and negative battery cable is disconnected, wait at least
90 seconds before working on SRS. SRS is equipped with a back-up power source that may allow air bag
to deploy within 90 seconds of disconnecting negative battery cable.
In a minor collision in which air bags do not deploy, steering wheel pad must be inspected.
NEVER use air bag parts from another vehicle. Replace air bag parts with new parts.
Air bag sensor assembly contains mercury. After replacement, DO NOT destroy the old part. When
scrapping vehicle or replacing air bag sensor assembly, remove air bag sensor assembly and dispose of as
toxic waste.
Never disassemble or repair system components. Replace cracked, dented or otherwise damaged system
components.
Remove air bag sensor if shocks are likely to be applied to the sensor during repairs.
When diagnosing electrical circuits, use a Digital Volt/Ohmmeter (DVOM) with high impedance (10,000
ohms minimum).
Information labels are attached to air bag components. Follow all notices on labels.
After servicing SRS, check air bag warning light to ensure system is functioning properly. See SYSTEM
OPERATION CHECK .
Always wear safety glasses when servicing or handling an air bag.
When placing a live air bag on a bench or other surface, always face air bag and trim cover up, away from
surface. This will reduce motion of module if accidentally deployed.
After deployment, air bag surface may contain deposits of sodium hydroxide which irritates skin. During
clean-up, always wear safety glasses, rubber gloves and long-sleeved shirt. After clean-up, wash hands
using mild soap and water.
When carrying a live air bag module, trim cover must be pointed away from your body to minimize
injury in case of accidental deployment.
If SRS is not fully functional for any reason, vehicle should not be driven until system is repaired and
a
gain becomes operational. DO NOTremove bulbs, modules, sensors or other components or in any way

1996 Toyota 4Runner
AIR BAG RESTRAINT SYSTEM 1996 ACCESSORIES/SAFETY EQUIPMENT Toyota Air Bag Restraint System
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