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 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

: 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 Cowl Wire (Under the Blower Motor)
IG338Engine Wire and Cowl Wire (Under the Blower Motor)
IJ138Engine Room Main Wire and Cowl Wire (Right Kick Panel)IJ238Engine Room Main Wire and Cowl Wire (Right Kick Panel)
IK138Floor No.2 Wire and Cowl Wire (Right Kick Panel)
: GROUND POINTS
CodeSee PageGround Points Location
EA34Right Radiator Side Support
EC34Intake Manifold
IF36Instrument Panel Brace LH
: SPLICE POINTS
CodeSee PageWire Harness with Splice PointsCodeSee PageWire Harness with Splice Points
E134Engine Room Main Wire

MEMO

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.

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±B W±B
W±B
W±R W±R
AIRBAG SQUIB
(
STEERING
WHEEL PAD) A17
AIRBAG SQUIB
(
FRONT PASSENGER
AIRBAG ASSEMBLY) A16
JUNCTION
CONNECTOR J 9C 4
CENTER AIRBAG SENSOR ASSEMBLYB A, C 5
C , C 6 B 26 B15 B20 B9 IA1 1IA12 1 II1 II12
BR BR
W± R
BR±W
B±W W±R
BR±W
B±W
AIRBAG SENSOR
FRONT L H A 9
AIRBAG SENSOR
FRONT RH A10
CONNECTION
DETECTION
PIN
2 1 CONNECTION
DETECTION
PIN
2 1AB AB
IG2 ±SL +SL ACC ±SR +SR
E1 E2 D+ D± P+ P±IG1 8
B 4A AENGINE CONTROL
MODULE E 7
12
L L L
JUNCTION
CONNECTOR J 8
GSWF/PS

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 P13
PRETENSIONER
RH P14JUNCTION
CONNECTOR J 2
JUNCTION
CONNECTOR J 2
DATA LINK
CONNECTOR 3 D 3
DATA LINK
CONNECTOR 2 D 2LG
C 4
CENTER AIRBAG SENSOR ASSEMBLYB A, C 5
C , C 6
Y±B
Y
PL+ PL± PR+ PR± SILLA TC
JUNCTION
CONNECTOR J20A CAC
B B
(
SHIELDED)
BR
J 6
JUNCTION
CONNECTORB A, J 7
DATA LINK
CONNECTOR 1 D 1
SRS WARNING
LIGHT
[COMB. METER] C11
I 1

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

MEMO

SHIFT LOCK
1T 11D81C7
1H 21R 4
1 2STOP LIGHT
SW 15A
CIG15A
ECU±IG15A
STOP
G±WP±L
B±R
13 6
KEY INTERLOCK
SOLENOID
L±B
W± B W± B
5 4SHIFT LOCK ECU
SHIFT LOCK
CONTROL SW
SHIFT LOCK
SOLENOID
L±B
B±RP±L
A
AJUNCTION
CONNECTOR
G
G±WG± R
L
L±R
A
A
IF IEJUNCTION
CONNECTOR FROM POWER SOURCE SYSTEM (
SEE PAGE 44)
J 5S 4
S 3
K 1J 4
W G±W
P1
P
P2
SLS±
SLS+2 1 2 3
1
KLS+E ACC IG STP
IE1 5
1J7
1J8
A W± B W±B
JUNCTION
CONNECTOR J 91 2
C C
JUNCTION
CONNECTOR J16
AA W±B
JUNCTION
CONNECTOR J 6

When the ignition SW is turned to ACC position the current from the CIG fuse flows to TERMINAL 1 of the shift lock ECU, in
the ON position, the current from the ECU±IG fuse flows to TERMINAL 3 of the ECU.
1. SHIFT LOCK MECHANISM
With the ignition SW on, when a signal that the brake pedal is depressed (Stop light SW on) and a signal that the shift lever
is put in P position (Continuity between P1 and P of the shift lock control SW) is input to the shift lock ECU, the ECU
operates and current flows from TERMINAL 3 of the ECU to TERMINAL SLS+ of the shift lock solenoid to solenoid to
TERMINAL SLS± to TERMINAL 5 of the ECU to GROUND. This causes the shift lock solenoid to turn on (Plate stopper
disengages) and the shift lever can shift into position other than the P.
2. KEY INTERLOCK MECHANISM
With the ignition SW ON or ACC position, when the shift lever is put in P position (No continuity between P2 and P of shift
lock control SW), the current flowing from TERMINAL 4 of the shift lock ECU to the key interlock solenoid is cut off. This
causes the key interlock solenoid to turn off (Lock lever disengages from LOCK position) and the ignition key can be turned
from ACC to LOCK position.
S3 SHIFT LOCK ECU
1±GROUND : Approx. 12 volts with the ignition SW at ACC or ON position
3±GROUND : Approx. 12 volts with the ignition SW at ON or ST position
5±GROUND : Always continuity
6±GROUND : Approx. 12 volts with the brake pedal depressed
S4 STOP LIGHT SW
2±1 : Closed with the brake pedal depressed
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
J431J931S331
J531J1631S431
J631K131
: 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)1H22Instrument 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)
1T22Instrument Panel Wire and Instrument Panel J/B (Lower Finish Panel)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CodeSee PageJoining Wire Harness and Wire Harness (Connector Location)
IE136Instrument Panel Wire and Cowl Wire (Lower Finish Panel)
: GROUND POINTS
CodeSee PageGround Points Location
IE36Left Kick Panel
IF36Instrument Panel Brace LH
SYSTEM OUTLINE
SERVICE HINTS