1999 TOYOTA CAMRY Service Repair Manual

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TOYOTA CAMRY 1999 Service Repair Manual ABS
This system controls the respective brake fluid pressures acting on the disc brake cylinders of the right front wheel, left front
wheel and rear wheels when the brakes are applied in a panic stop

ABS
This system controls the respective brake fluid pressures acting on the disc brake cylinders of the right front wheel, left front
wheel and rear wheels when the brakes are applied in a panic stop so that the wheels do not lock. This results in improved
directional stability and steerability during panic braking.
1. INPUT SIGNALS
(1) Speed sensor signal
The speed of the wheels is detected and input to TERMINALS FL+, FR+, RL+ and RR+ of the ABS ECU.
(2) Stop light SW signal
A signal is input to TERMINAL STP of the ABS ECU when the brake pedal is depressed.
2. SYSTEM OPERATION
During sudden braking the ABS ECU has signals input from each sensor, which controls the current to the solenoid inside
the actuator and lets the hydraulic pressure acting on each wheel cylinder escape to the reservoir. The pump inside the
actuator is also operating at this time and it returns the brake fluid from the reservoir to the master cylinder, thus preventing
locking of the vehicle wheels.
If the ABS ECU judges that the hydraulic pressure acting on the wheel cylinder is insufficient, the current on the solenoid is
controlled and the hydraulic pressure is increased. Holding of the hydraulic pressure is also controlled by the ABS ECU, by
the same method as above. Pressure reduction, holding and increase are repeated to maintain vehicle stability and to
improve steerability during sudden braking.
A6, A7 ABS SPEED SENSOR FRONT LH, RH
2±1 : Approx. 1.6 kW (20°C, 68°F)
A19, A20 ABS SPEED SENSOR REAR LH, RH
2±1 : Approx. 1.6 kW (20°C, 68°F)
A14 (B) ABS ECU
(B)13±GROUND : Approx. 12 volts with the ignition SW at ON or ST position
(B) 5±GROUND : Approx. 12 volts with the brake pedal depressed
(B)12, (B) 25±GROUND :
Always continuity
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
A4A28C1230J1231
A5B28D128J2031
A628D230J2231
A728J231J23A31
A13A30J331J24B31
A14B30J6A31S431
A1932J7B31
A2032J931
: RELAY BLOCKS
CodeSee PageRelay Blocks (Relay Block Location)
326Engine Room R/B No.3 (Radiator Upper Support RH)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CodeSee PageJunction Block and Wire Harness (Connector Location)
1C22Cowl Wire and Instrument Panel J/B (Lower Finish Panel)
1D22Instrument Panel Wire and Instrument Panel J/B (Lower Finish Panel)
1J22Cowl Wire and Instrument Panel J/B (Lower Finish Panel)1R22Cowl Wire and Instrument Panel J/B (Lower Finish Panel)
SYSTEM OUTLINE
SERVICE HINTS

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TOYOTA CAMRY 1999 Service Repair Manual : CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CodeSee PageJoining Wire Harness and Wire Harness (Connector Location)
IB136Floor Wire and Cowl Wire (Left Kick Panel)
IF136Instrument Panel Wire and

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TOYOTA CAMRY 1999 Service Repair Manual MEMO

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TOYOTA CAMRY 1999 Service Repair Manual SRS
NOTICE: When inspecting or repairing the SRS, perform the operation in accordance with the following precautionary
instructions and the procedure and precautions in the Repair Manual for the appli

SRS
NOTICE: When inspecting or repairing the SRS, perform the operation in accordance with the following precautionary
instructions and the procedure and precautions in the Repair Manual for the applicable model year.
Malfunction symptoms of the SRS are difficult to confirm, so the DTCs become the most important source of information
when troubleshooting. When troubleshooting the SRS, always inspect the DTCs before disconnecting the battery.
Work must be started after 90 seconds from when the ignition switch is turned to the ºLOCKº position and the
negative (±) terminal cable is disconnected from the battery.
(The SRS is equipped with a back±up power source so that if work is started within 90 seconds from
disconnecting the negative (±) terminal cable of the battery, the SRS may be deployed.)
When the negative (±) terminal cable is disconnected from the battery, the memory of the clock and audio system will be
canceled. So before starting work, make a record of the contents memorized in the audio memory system. When work is
finished, reset the audio systems as they were before and adjust the clock. To avoid erasing the memory in each
memory system, never use a back±up power supply from outside the vehicle.
Before repairs, remove the airbag sensor if shocks are likely to be applied to the sensor during repairs.
Do not expose the steering wheel pad, front passenger airbag assembly, seat belt pretensioner, center airbag sensor
assembly or front airbag sensor assembly directly to hot air or flames.
Even in cases of a minor collision where the SRS does not deploy, the steering wheel pad, front passenger airbag
assembly, seat belt pretensioner, center airbag sensor assembly and front airbag sensor assembly should be inspected.
Never use SRS parts from another vehicle. When replacing parts, replace them with new parts.
Never disassemble and repair the steering wheel pad, front passenger airbag assembly, seat belt pretensioner, center
airbag sensor assembly or front airbag sensor assembly in order to reuse it.
If the steering wheel pad, front passenger airbag assembly, seat belt pretensioner, center airbag sensor assembly or
front airbag sensor assembly has been dropped, or if there are cracks, dents or other defects in the case, bracket or
connector, replace them with new ones.
Use a volt/ohmmeter with high impedance (10 kW/V minimum) for troubleshooting the system's electrical circuits.
Information labels are attached to the periphery of the SRS components. Follow the instructions on the notices.
After work on the SRS is completed, perform the SRS warning light check.
If the vehicle is equipped with a mobile communication system, refer to the precaution in the IN section of the Repair
Manual.

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TOYOTA CAMRY 1999 Service Repair Manual SRS
5A
IGN
1N 415A
CIG FROM POWER SOURCE SYSTEM (
SEE PAGE 44)
1N 210A
ECU±B
2J 7
1G2
1W3
B 5B6
1N 1
1J 71N 3
1V 3
IF ID AB 27 B28
12
SPIRAL
CABLE
2 1 B 14 B13 B10 B11
B±O
GR
Y±GY±RY Y±B W±B W±

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TOYOTA CAMRY 1999 Service Repair Manual 2 1A 2A1
2 1C 5C6 13 12
IE2 2
A AIG3 7IG311
C C
IG3 6
A A
EC B 12 B 3B19 511 3
B
3 AB
B
4
7
A AB TC E1
E1 TC
SILLG
LG±R
BR LG
LG±R B±Y
P±B
LG±R BR BR BR BRW Y Y±B
W
BR
W±R
LG
PRETENSIONER
LH P1

Page 4127 of 4592

TOYOTA CAMRY 1999 Service Repair Manual SRS
The SRS is a driver and front passenger protection device which has a supplemental role to the seat belts.
When the ignition SW is turned to ACC or ON, current from the CIG fuse flows to TERMINAL

SRS
The SRS is a driver and front passenger protection device which has a supplemental role to the seat belts.
When the ignition SW is turned to ACC or ON, current from the CIG fuse flows to TERMINAL (B) 6 of the center airbag
sensor assembly. Only when the ignition SW is on does the current flow from the IGN fuse to TERMINAL (B) 5 of the center
airbag sensor assembly.
If an accident occurs while driving, when the frontal impact exceeds a set level, current from the CIG or IGN fuse flows to
TERMINALS (B) 14, (B) 10, (A) 2 and (C) 5 of the center airbag sensor assembly to TERMINAL 1 of the airbag squibs and
the pretensioners to TERMINAL 2 to TERMINALS (B) 13, (B) 11, (A) 1 and (C) 6 of the center airbag sensor assembly to
TERMINAL (B) 27, (B) 28 or BODY GROUND to GROUND, so that current flows to the front airbag squibs and the
pretensioners and causes them to operate.
The airbag stored inside the steering wheel pad is instantaneously expanded to soften the shock to the driver.
The airbag stored inside the passenger's instrument panel is instantaneously expanded to soften the shock to the front
passenger.
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
A928C1130J7B31
A1028D128J831
A1630D230J931
A1730D330J2031
C4A30E730P1333
C5B30J231P1433
C6C30J6A31
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CodeSee PageJunction Block and Wire Harness (Connector Location)
1G22Instrument Panel Wire and Instrument Panel J/B (Lower Finish Panel)
1J
1N22Cowl Wire and Instrument Panel J/B (Lower Finish Panel)1V22Cowl Wire and Instrument Panel J/B (Lower Finish Panel)
1W
2J24Cowl Wire and Engine Room J/B No.2 (Engine Compartment Left)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CodeSee PageJoining Wire Harness and Wire Harness (Connector Location)
IA136Cowl Wire and Cowl Wire (Left Kick Panel)
IE236Instrument Panel Wire and Cowl Wire (Lower Finish Panel)
IG138Engine Wire and Cowl Wire (Under the Blower Motor)IG338Engine Wire and Cowl Wire (Under the Blower Motor)
II138Engine Room Main Wire and Cowl Wire (Cowl Side Panel RH)
: GROUND POINTS
CodeSee PageGround Points Location
EC34Intake Manifold
ID36Cowl Side Panel LH
IF36Instrument Panel Brace LH
: SPLICE POINTS
CodeSee PageWire Harness with Splice PointsCodeSee PageWire Harness with Splice Points
I138Cowl Wire
SYSTEM OUTLINE

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