wiring TOYOTA RAV4 1996 Service Owner's Manual

Fig. 16: SRS Wiring Diagram (4-Runner)

1996 Toyota 4Runner
AIR BAG RESTRAINT SYSTEM 1996 ACCESSORIES/SAFETY EQUIPMENT Toyota Air Bag Restraint System
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AIR BAG RESTRAINT SYSTEM
1999 Toyota
DESCRIPTION & OPERATION
Supplemental Restraint System (SRS), also known as air bag system, is designed to provide increased accident
protection for driver and passenger by deploying air bags in a front-end collision. The air bag system is
designed to be used in conjunction with 3-point safety belts.
The air bag system includes the following components: driver-side air bag module (steering wheel pad),
passenger-side air bag module, spiral cable, AIR BAG warning light, air bag sensor assembly, right and left
front air bag sensors, right and left front seat belt pretensioners and associated wiring harnesses. See Fig. 1
. WARNING:To avoid injury from accidental air bag deployment, read and carefully
follow all WARNINGS and SERVICE PRECAUTIONS
.

1999 Toyota RAV4
AIR BAG RESTRAINT SYSTEM 1999 Toyota

1999 Toyota RAV4
AIR BAG RESTRAINT SYSTEM 1999 Toyota
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Fig. 1: Locating Restraint System Components
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
AIR BAG SENSOR ASSEMBLY
The air bag sensor assembly is located on the floor inside center console box. It consists of an air bag sensor,
safing sensor and diagnosis, ignition control and drive circuits. It receives signals from the air bag sensor and
determines whether air bag system must be deployed or not.
DRIVER-SIDE AIR BAG MODULE
The driver-side air bag and inflator is stored in the steering wheel pad. It contains a squib, igniter charge and gas
generant and inflates the air bag when instructed by air bag sensor assembly. Driver-side air bag module is also
called steering wheel pad.
FRONT AIR BAG SENSOR
The front air bag sensors are mounted inside right and left front side members. When sensor detects an impact
of sufficient force (above a predetermined limit), contacts inside the sensor close, sending a signal to the air bag
sensor assembly.
PASSENGER-SIDE AIR BAG MODULE
The passenger-side air bag and inflator is stored in the instrument panel above glove box. It contains a squib,
igniter charge and gas generant and inflates the air bag when instructed by air bag sensor assembly.
SEAT BELT PRETENSIONER
The seat belt pretensioner system is a component of the front outer seat belt assembly. It contains a squib, gas
generant, wire and piston and operates in the event of a front-end collision.
SPIRAL CABLE
The spiral cable is attached to combination switch and is used as an electrical joint between chassis wiring
harness and driver-side air bag module. Spiral cable is also known as clockspring.
SERVICE PRECAUTIONS
Observe the following precautions when servicing air bag system:
Disable air bag system before servicing any air bag system or steering column component. Failure to do
this could result in accidental air bag deployment and possible personal injury. See DISABLING &
ACTIVATING AIR BAG SYSTEM .
When diagnosing air bag system, always check for diagnostic codes before disconnecting battery.
After turning ignition switch to LOCK position and disconnecting negative battery cable, wait at least 90
seconds before workin
g on air bag system. Air bag system is equipped with a back-up power source that

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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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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.

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Possible Causes
DTC 11/B0102 could be caused by a short to ground in squib circuit, squib malfunction, spiral cable
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 ground and terminal D+ (Yellow/Black wire) of spiral cable side of upper
spiral cable connector. See WIRING DIAGRAMS
. If resistance is more than one megohm, go to next
step. If resistance is less than one megohm, go to step 5).
3. Reconnect air bag sensor assembly connector C20 (center connector). Connect jumper wire between
terminal D+ (Yellow/Black wire) and terminal D- (Yellow wire) of spiral cable side of upper spiral cable
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 11/B0102 is displayed, replace air bag sensor assembly. If DTC
11/B0102 is not displayed, go to next step.
4. Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds.
Reconnect upper spiral cable connector (to driver-side air bag module). Reconnect 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 codes. See RETRIEVING CODES
under DIAGNOSIS & TESTING. If DTC 11/B0102 is
displayed, replace driver-side air bag module. If DTC 11/B0102 is not displayed, system is functioning
properly at this time. Check for intermittent fault. See AIR BAG WARNING LIGHT
INTERMITTENT .
5. Disconnect spiral cable lower connector. Measure resistance between ground and terminal D+
(Yellow/Black wire) of spiral cable side of upper spiral cable connector. If resistance is more than one
megohm, repair or replace wiring harness or connector between spiral cable and air bag sensor assembly.
If resistance is less than one megohm, replace spiral cable.
DTC 12/B0103: DRIVER-SIDE AIR BAG SQUIB CIRCUIT SHORT TO BATTERY
Description
The driver-side air bag squib circuit consists of the air bag sensor assembly, spiral cable and driver-side air bag
module. The squib causes driver-side air bag to deploy when all deployment conditions are satisfied.
Possible Causes
DTC 12/B0103 could be caused by a short to battery in squib circuit, squib malfunction, spiral cable NOTE: During testing, if DTCs other than DTC 11/B0102 are displayed, disregard them.

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malfunction or air bag sensor assembly malfunction.
Diagnostic Procedure
1. Disable air bag system. See DISABLING SYSTEM under DISABLING & ACTIVATING AIR BAG
SYSTEM. Connect negative battery cable.
2. Measure voltage between ground and D+ (Yellow/Black wire) terminal of spiral cable side of upper spiral
cable connector. If voltage is zero volt, go to next step. If voltage more than zero volt, go to step 5).
3. Disconnect negative battery cable. Reconnect air bag sensor assembly connector C20 (center connector).
Connect jumper wire between terminal D+ (Yellow/Black wire) and terminal D- (Yellow wire) of spiral
cable side of upper spiral cable 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 codes. See RETRIEVING
CODES under DIAGNOSIS & TESTING. If DTC 12/B0103 is displayed, replace air bag sensor
assembly. If DTC 12/B0103 is not displayed, go to next step.
4. Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds.
Reconnect upper spiral cable connector (to driver-side air bag module). Reconnect 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 codes. See RETRIEVING CODES
under DIAGNOSIS & TESTING. If DTC 12/B0103 is
displayed, replace driver-side air bag module. If DTC 12/B0103 is not displayed, system is functioning
properly at this time. Check for intermittent fault. See AIR BAG WARNING LIGHT
INTERMITTENT .
5. Disconnect spiral cable lower connector. Measure voltage between ground and terminal D+
(Yellow/Black wire) of spiral cable side of upper spiral cable connector. If voltage is zero volt, repair or
replace wiring harness or connector between spiral cable and air bag sensor assembly. If voltage is more
than zero volt, replace spiral cable.
DTC 13/B0100: SHORT IN DRIVER-SIDE AIR BAG MODULE SQUIB CIRCUIT
Description
The driver-side air bag squib circuit consists of the air bag sensor assembly, spiral cable and driver-side air bag
module. The squib causes driver-side air bag to deploy when all deployment conditions are satisfied.
Possible Causes
DTC 13/B0100 could be caused by a short between D+ (Yellow/Black wire) and D- (Yellow wire) in squib
circuit, squib malfunction, spiral cable malfunction or air bag sensor assembly malfunction. NOTE: During testing, if DTCs other than DTC 12/B0103 are displayed, disregard them.
NOTE: During testing, if DTCs other than DTC 13/B0100 are displayed, disregard them.

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connector C20, terminals No. 5 (circuit IG2, Black/Orange wire) and No. 6 (circuit ACC, Gray wire). See
Fig. 16
. If voltage is more than 16 volts, check battery and charging system operation. If voltage is less
than 16 volts, go to next step.
3. 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.
Repeat at least 5 times. Retrieve DTCs. See RETRIEVING CODES
under DIAGNOSIS & TESTING.
If DTC 31/B1100 is displayed, replace air bag sensor assembly. If DTC 31/B1100 is not displayed,
system is functioning properly at this time. Check for intermittent fault. See AIR BAG WARNING
LIGHT INTERMITTENT .
DTC 51/B0107: SHORT TO GROUND IN PASSENGER-SIDE AIR BAG SQUIB CIRCUIT
Description
The passenger-side air bag squib circuit consists of the air bag sensor assembly and passenger-side air bag
module. The squib circuit causes the passenger-side air bag to deploy when deployment conditions are satisfied.
Possible Causes
DTC 51/B0107 could be caused by a short to ground in Yellow/Red (circuit P+) and Yellow/Green (circuit P-)
wires in passenger-side air bag squib circuit, passenger-side air bag 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 ground and Yellow/Red wire (circuit P+) of air bag sensor assembly side of
passenger-side air bag squib harness connector. See WIRING DIAGRAMS
. If resistance is less than
one megohm, repair or replace harness or connector between passenger-side air bag module and air bag
sensor assembly. If resistance is more than one megohm, go to next step.
3. Reconnect air bag sensor assembly connector C20 (center connector) to air bag sensor assembly. Connect
jumper wire between Yellow/Red wire (circuit P+) and Yellow/Green wire (circuit P-) of air bag sensor
assembly side of passenger-side air bag 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 51/B0107 is not displayed, go to
next step. If DTC 51/B0107 is displayed, replace air bag sensor assembly.
4. Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds.
Reconnect passenger-side air bag module 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. NOTE: During testing, if DTCs other than DTC 51/B0107 are displayed, disregard them.

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See RETRIEVING CODES under DIAGNOSIS & TESTING. If DTC 51/B0107 is not displayed,
system is functioning properly at this time. Check for intermittent fault. See AIR BAG WARNING
LIGHT INTERMITTENT . If DTC 51/B0107 is displayed, replace passenger-side air bag module.
DTC 52/B0108: SHORT TO BATTERY IN PASSENGER-SIDE AIR BAG SQUIB CIRCUIT
Description
The passenger-side air bag squib circuit consists of the air bag sensor assembly and passenger-side air bag
module. The squib circuit causes the passenger-side air bag to deploy when deployment conditions are satisfied.
Possible Causes
DTC 52/B0108 could be caused by a short to battery in Yellow/Red (circuit P+) and Yellow/Green (circuit P-)
wires in passenger-side air bag squib circuit, passenger-side air bag squib malfunction or air bag sensor
assembly malfunction.
Diagnostic Procedure
1. Disable air bag system. See DISABLING SYSTEM under DISABLING & ACTIVATING AIR BAG
SYSTEM. Reconnect negative battery cable.
2. Turn ignition switch to ACC or ON position. Measure voltage between ground and Yellow/Red wire
(circuit P+) of air bag sensor assembly side of passenger-side air bag squib harness connector. See
WIRING DIAGRAMS
. If voltage is zero volt, go to next step. If voltage is not zero volt, repair or
replace harness or connector between passenger-side air bag module and air bag sensor assembly.
3. Disconnect negative battery cable. Wait at least 90 seconds. Reconnect air bag sensor assembly connector
C20 (center connector) to air bag sensor assembly. Connect jumper wire between Yellow/Red wire
(circuit P+) and Yellow/Green wire (circuit P-) of air bag sensor assembly side of passenger-side air bag
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 52/B0108 is not displayed, go to next step. If DTC
52/B0108 is displayed, replace air bag sensor assembly.
4. Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds.
Reconnect passenger-side air bag module 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 52/B0108 is not displayed,
system is functioning properly at this time. Check for intermittent fault. See AIR BAG WARNING
LIGHT INTERMITTENT . If DTC 52/B0108 is displayed, replace passenger-side air bag module.
DTC 53/B0105: SHORT IN PASSENGER-SIDE AIR BAG SQUIB CIRCUIT NOTE: During testing, if DTCs other than DTC 52/B0108 are displayed, disregard them.

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