sensor TOYOTA RAV4 1996 Service Service Manual

REMOVAL & INSTALLATION
AIR BAG SENSOR ASSEMBLY
Removal & Installation
1. Before proceeding, see SERVICE PRECAUTIONS . Air bag sensor assembly is located on the floor
inside center console box. See Fig. 10
. Turn ignition switch to LOCK position. Disconnect negative
battery cable. Wait at least 90 seconds.
2. Remove shift lever and boot. Ash tray and console box hole cover. Remove console box. Remove 4 Torx
screws retaining air bag sensor assembly. Remove air bag sensor assembly.
3. To install, reverse removal procedure. Tighten air bag sensor assembly Torx screws to specification. See
TORQUE SPECIFICATIONS
. Check AIR BAG warning light to ensure system is functioning
properl
y. See SYSTEM OPERATION CHECK. WARNING:Failure to follow service precautions may result in air bag deployment and
personal injury. See SERVICE PRECAUTIONS
. After component
replacement, check system operation. See SYSTEM OPERATION CHECK
.

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Fig. 10: Removing Air Bag Sensor Assembly
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
DRIVER-SIDE AIR BAG MODULE
Removal & Installation
1. Before proceeding, see SERVICE PRECAUTIONS . Ensure front wheels are in straight-ahead position.
Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds.
Working from back of steering wheel, loosen air bag module mounting Torx screws until groove around
screw circumference catches on screw case. See Fig. 11
.
2. Pull drive
r-side air bag module from steering wheel and disconnect driver-side air bag module connector.
NOTE: If steering wheel horn button contact plate is deformed, replace steering wheel
assembly.

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Place driver-side air bag module on a flat surface with pad side facing up.
3. To install, reverse removal procedure. Ensure front wheels are in straight-ahead position and spiral cable
is properly aligned. See SPIRAL CABLE under ADJUSTMENTS
. Tighten driver-side air bag module
mounting screws to specification. See TORQUE SPECIFICATIONS
. Check AIR BAG warning light
to ensure system is functioning properly. See SYSTEM OPERATION CHECK
.
Fig. 11: Removing Driver
-Side Air Bag Module
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
FRONT AIR BAG SENSOR
Removal & Installation
1. Before proceeding, see SERVICE PRECAUTIONS . Turn ignition switch to LOCK position.
Disconnect negative battery cable. Wait at least 90 seconds. The front air bag sensors are mounted inside
right and left front side members.
2. For left front air ba
g sensor, remove left front end panel and headlight. See Fig. 12 . Disconnect front air

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bag sensor connector with sensor installed. Remove inner fender panel. Remove 3 bolts and move air
intake resonator aside. Remove 2 mounting bolts and remove sensor.
3. For right front air bag sensor, remove right front end panel and headlight. See Fig. 12
. Disconnect front
air bag sensor connector with sensor installed. Remove 2 mounting bolts and remove sensor.
4. To install, reverse removal procedure. Tighten front air bag sensor mounting screws to specification. See
TORQUE SPECIFICATIONS
. Check AIR BAG warning light to ensure system is functioning
properly. See SYSTEM OPERATION CHECK
.
Fig. 12: Removing Front Air Bag Sensors

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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1. Before proceeding, see SERVICE PRECAUTIONS . Ensure front wheels are in straight-ahead position.
Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds.
Remove steering wheel. See STEERING WHEEL
.
2. Remove lower finish panel and instrument panel lower insert. Remove upper and lower steering column
covers. Disconnect and remove combination switch with spiral cable attached. Remove heater-to-register
duct. Match mark steering shaft and steering gear shaft for reassembly performance. Remove steering
column.
3. To install, reverse removal procedure. Tighten fasteners to specification. See TORQUE
SPECIFICATIONS . Check AIR BAG warning light to ensure system is functioning properly. See
SYSTEM OPERATION CHECK
.
STEERING WHEEL
Removal & Installation
1. Before proceeding, see SERVICE PRECAUTIONS . Ensure front wheels are in straight-ahead position.
Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds.
Remove driver-side air bag module. See DRIVER
-SIDE AIR BAG MODULE .
2. Remove steering wheel nut. Match mark steering wheel and steering column for reassembly reference.
Using appropriate puller, remove steering wheel.
3. To install, reverse removal procedure. Ensure front wheels are in straight-ahead position and spiral cable
is properly aligned. See SPIRAL CABLE under ADJUSTMENTS
. Tighten steering wheel nut and
driver-side air bag module screws to specification. See TORQUE SPECIFICATIONS
. Check AIR
BAG warning light to ensure system is functioning properly. See SYSTEM OPERATION CHECK
.
SYSTEM OPERATION CHECK
Turn ignition switch to ACC or ON position. AIR BAG warning light should come on for about 6 seconds and
then go out. If AIR BAG warning light does not operate as specified, see DIAGNOSIS & TESTING
.
DIAGNOSIS & TESTING
AIR BAG WARNING LIGHT CHECK
Turn ignition switch to ACC or ON position. If air bag warning light comes on for about 6 seconds and then
goes off, system is functioning properly. If AIR BAG warning light comes on and stays on (or flashes),
Diagnostic Trouble Code (DTC) is stored in air bag sensor assembly. Go to RETRIEVING CODES
. If AIR
BAG warning light responds in any other way, go to DIAGNOSTIC TESTS
.
RETRIEVING CODES
CAUTION: System may be damaged if jumper wire is incorrectly connected across
terminals of Data Link Connector (DLC1). Use Diagnosis Check Wire
(09843-18020) when connecting terminals of DLC1.

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Using Diagnosis Check Wire
1. Turn ignition switch to ACC or ON position. Wait about 20 seconds. Using Diagnosis Check Wiring
(09843-18020), connect terminals Tc and E1 of Data Link Connector (DLC1). See Fig. 14
. DLC1 is
located forward of right (passenger-side) front strut tower.
2. If AIR BAG warning light flashes 2 times per second, system is normal (normal code). If AIR BAG
warning light does not flash Diagnostic Trouble Codes (DTCs) or flashes DTCs without DLC1
connection, proceed to DTCS NOT DISPLAYED
under DIAGNOSTIC TESTS or DTCS
CONTINUOUSLY DISPLAYED under DIAGNOSTIC TESTS. If AIR BAG warning light is on
continuously and DTC is normal (flashes 2 times per second), source voltage is low. Go to SOURCE
VOLTAGE DROP under DIAGNOSTIC TESTS.
3. If AIR BAG warning light flashes, count number of flashes to determine DTCs that are set. For example,
DTC 12 is: FLASH, 1.5-second pause, FLASH, FLASH. If more than one DTC is displayed, a 2.5-
second pause will occur between each DTC. Lowest numbered DTC will be displayed first, followed by
next higher number DTC until all DTCs have been displayed.
4. After all DTCs are displayed, a 4-second pause will occur, and DTC display will be repeated. See
appropriate DTC under DIAGNOSTIC TESTS. After repairing, clear DTCs. See CLEARING CODES
.
Using Toyota Hand-Held Tester
Install Toyota hand-held tester to DLC1 or DLC3. DLC1 is located forward of right (passenger-side) front strut
tower. See Fig. 14
. DLC3 is located under left side of instrument panel, to right of steering column. Read DTC
by following prompts on tester. See tester operator's manual for instructions. NOTE: If DTCs other than those listed under DIAGNOSTIC TESTS
are displayed,
replace the air bag sensor assembly. If the air bag warning light does not
function as described, proceed to appropriate test under DIAGNOSTIC TESTS
.

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cleared.
Using Toyota Hand-Held Tester
Connect Toyota hand-held tester to DLC1 or DLC3. Clear DTCs by following prompts on tester. See tester
operator's manual for instructions.
RELEASING SHORTING SPRING
1. Air bag squib circuit consists of circuit between air bag sensor assembly and air bag. If voltage is
accidentally applied across squib circuit (as when testing, for example), air bag will deploy.
2. To prevent accidental deployment, squib circuit connectors contain a spring-loaded shorting bar (shorting
spring). When squib circuit connector is disconnected, shorting spring automatically shorts squib circuit
positive and negative circuits together. This prevents air bag deployment if voltage is accidentally applied
across squib circuit.
3. When connector halves are attached, shorting bar is in released position (no continuity exists between
terminals). When connector is disconnected, shorting bar is engaged (continuity exists between
terminals).
4. Some testing procedures require shorting spring to be in released position with connector disconnected
(this is opposite of its normal position). To hold shorting spring in released position, obtain a piece of
paper that is same thickness as male terminal blade that slides under shorting spring when the connector
is connected. See Fig. 15
.
5. With squib circuit connector disconnected, insert paper into female terminal, sliding it under shorting
sprin
g. This lifts spring, breaking circuit and allowing test procedure to be performed. NOTE: Perform this procedure only if you were sent here from DIAGNOSTIC TESTS.
CAUTION: If paper thicker than male terminal is used, connector terminal could
be damaged. Damaged connector terminal could result in system
fault. Always use paper that is same thickness as male terminal.

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Fig. 15: Releasing Shorting Spring
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
DIAGNOSTIC TESTS
AIR BAG WARNING LIGHT DOES NOT ILLUMINATE
Description
AIR BAG warning light is located in instrument cluster. When air bag system is normal, AIR BAG warning
light illuminates for about 6 seconds after ignition switch is turned from LOCK to ACC or ON position, and
turns off automatically. If a malfunction is present in air bag system, AIR BAG warning light illuminates to
inform operator of malfunction. When Data Link Connector 1 (DLC1) terminals Tc and E1 are connected
together, a Diagnostic Trouble Code (DTC) is displayed by flashing AIR BAG warning light.
Diagnostic Procedure
1. Remove SRS-B fuse and check continuity across fuse blades. SRS-B fuse is located in instrument panel
fuse block under left side of instrument panel. If fuse is faulty, go to step 4). If fuse is okay, reinstall fuse
and go to next step.
2. Disable air bag system. See DISABLING SYSTEM
under DISABLING & ACTIVATING AIR BAG
SYSTEM. Reconnect negative battery cable. Turn ignition switch to ACC or ON position. Measure
voltage between ground and harness side of air bag sensor assembly connector C20, terminal No. 3
(circuit LA, Black/Yellow wire). See Fig. 16
. If 10-14 volts is not present, repair AIR BAG warning
light bulb or circuit. If 10-14 volts is present, go to next step.
3. Turn ignition switch to LOCK position. Disconnect negative battery cable. Reconnect 3 air bag sensor
assembly connectors. Leave air bag modules, pretensioners and front air bag sensors disconnected.
Reconnect negative battery cable and wait at least 2 seconds. Turn ignition switch to ACC or ON
position. If AIR BAG warning light illuminates, system operation is normal. If AIR BAG warning light
does not come on, check for poor connection at air bag sensor assembly connector C20, terminal No. 3
(Black/Yellow wire). If connection is oka
y, replace air bag sensor assembly. WARNING:Failure to follow service precautions may result in air bag deployment and
personal injury. See SERVICE PRECAUTIONS
. After component
replacement, check system operation. See SYSTEM OPERATION CHECK
.
CAUTION: Ensure ignition switch is in LOCK position before disconnecting or
connecting negative battery cable. If ignition switch is in ACC or ON
position when negative battery cable is disconnected or connected, air
bag sensor may be damaged. To prevent damage to connector terminals,
DO NOT probe terminal ends. Instead, backprobe terminals (probe
terminal where wire enters harness connector).
NOTE: In the following tests, the term squib connector and module connector may be
used interchangeably.

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4. Recheck SRS-B fuse. If fuse is blown, check harness between SRS-B fuse and AIR BAG warning light.
If fuse is okay, check for intermittent fault. See AIR BAG WARNING LIGHT INTERMITTENT
.
Fig. 16: Identifying Air Bag Sensor Assembly Connectors

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
AIR BAG WARNING LIGHT IS ILLUMINATED WITH IGNITION OFF
Description
AIR BAG warning light is located in instrument cluster. When air bag system is normal, AIR BAG warning
light illuminates for about 6 seconds after ignition switch is turned from LOCK to ACC or ON position, and
turns off automatically. If a malfunction is present in air bag system, AIR BAG warning light illuminates to
inform operator of malfunction. When Data Link Connector 1 (DLC1) terminals Tc and E1 are connected
together, a Diagnostic Trouble Code (DTC) is displayed by flashing AIR BAG warning light.
Diagnostic Procedure
Disable air bag system. See DISABLING SYSTEM under DISABLING & ACTIVATING AIR BAG
SYSTEM. Reconnect negative battery cable. Perform SYSTEM OPERATION CHECK
. If AIR BAG
warning light does not illuminate, replace air bag sensor assembly. If AIR BAG warning light is still
illuminated, repair AIR BAG warning light circuit Black/Yellow wire or circuit AB (Black/Yellow wire)
leadin
g to the DLC1. See WIRING DIAGRAMS.

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AIR BAG WARNING LIGHT INTERMITTENT
If AIR BAG warning light comes on intermittently, perform following tests to simulate driving conditions. If
problem cannot be found, replace all components including wiring harness.
Wiggle-test wiring harness.
Apply heat to components with a hair dryer.
Spray water onto entire vehicle (not directly onto electrical components) to simulate humidity.
DTCS NOT DISPLAYED
Description
When DLC1 terminals Tc and E1 are connected together, air bag sensor assembly is set in Diagnostic Trouble
Code (DTC) output mode. DTC is displayed by flashing AIR BAG warning light.
Diagnostic Procedure
1. Turn ignition switch from LOCK to ACC or ON position. If AIR BAG warning light does not illuminate
for about 6 seconds, repair AIR BAG warning light circuit. See WIRING DIAGRAMS
. If AIR BAG
warning light illuminates for about 6 seconds, go to next step.
2. Measure voltage between DLC1 terminals Tc and E1. See Fig. 14
. If 10-14 volts is present, go to step 4).
If 10-14 volts is not present, go to next step.
3. Measure voltage between ground and DLC1 terminal Tc. If 10-14 volts is present, repair harness between
ground and DLC1 terminal E1. See WIRING DIAGRAMS
. If 10-14 volts is not present, go to next
step.
4. Turn ignition switch to LOCK position. Disconnect negative battery cable and wait at least 90 seconds.
Access and disconnect air bag sensor assembly connector C20 (center connector). See AIR BAG
SENSOR ASSEMBLY under REMOVAL & INSTALLATION
. Connect one end of jumper wire to
harness side of air bag sensor assembly connector C20, terminal No. 19 (Circuit Tc, Pink/Black wire).
See Fig. 16
. Leave other end of jumper wire disconnected. Reconnect air bag sensor assembly connector
with jumper wire connected. Connect negative battery cable and turn ignition switch to ACC or ON
position. Wait at least 20 seconds. Connect unconnected end of jumper wire to ground. If AIR BAG
warning light does not illuminate, replace air bag sensor assembly. If AIR BAG warning light illuminates,
check Pink/Black wire between air bag sensor assembly and DLC1.
DTCS CONTINUOUSLY DISPLAYED
Description
NOTE: Use following procedure if DTCs are not displayed or air bag warning light stays
on when jumper wire is connected between terminals Tc and E1 of DLC1.
NOTE: Use following procedure if DTCs are displayed without connecting jumper wire
between terminals Tc and E1 of DLC1.

1999 Toyota RAV4
AIR BAG RESTRAINT SYSTEM 1999 Toyota
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