light TOYOTA CAMRY 1999 Service Repair Manual

CRUISE CONTROL
Current is applied at all times through the STOP fuse to TERMINAL 2 of the stop light SW.
With the ignition SW turned to on, current flows through the GAUGE fuse to TERMINAL (C) 7 of the combination meter and
the current through the ECU±IG fuse flows to TERMINAL 9 of the cruise control ECU.
When the ignition SW is on and the cruise control SW is turned on, a signal is input from TERMINAL 5 of the cruise control
SW to TERMINAL 11 of the cruise control ECU. As a result, the cruise control ECU functions and the current flows from the
ECU±IG fuse to TERMINAL 9 of the cruise control ECU to TERMINAL 16 to GROUND, and the cruise control system is in a
condition ready for operation.
At the same time, the current through the GAUGE fuse flows to TERMINAL (C) 7 of the cruise control indicator light to
TERMINAL (C) 10 to TERMINAL 4 of the cruise control ECU to TERMINAL 16 to GROUND, causing the cruise control
indicator light to light up, indicating that cruise control is ready for operation.
1. SET OPERATION
When the cruise control SW is turned on and the set SW is pushed with the vehicle speed within the set limit (Approx. 40
km/h, 25 mph to 200 km/h, 124 mph), a signal is input to TERMINAL 10 of the cruise control ECU and the vehicle speed at
the time the set SW is released is memorized in the ECU as the set speed.
2. SET SPEED CONTROL
During cruise control driving, the cruise control ECU compares the set speed memorized in the cruise control ECU with the
actual vehicle speed input into TERMINAL 12 of the cruise control ECU from the speed sensor, and controls the cruise
control actuator to maintain the set speed.
When the actual speed is lower than the set speed, the ECU causes the current to the cruise control actuator to flow from
TERMINAL 15 of the cruise control ECU to TERMINAL 1 of the cruise control actuator to TERMINAL 2 to TERMINAL 7 of
the cruise control ECU. As a result, the motor in the cruise control actuator is rotated to open the than the set speed, the
current to the cruise control actuator flows from TERMINAL 7 of the cruise control ECU to TERMINAL 2 of the cruise control
actuator to TERMINAL 1 to TERMINAL 15 of the cruise control ECU.
This causes the motor in the cruise control actuator to rotate to close the throttle valve and return the throttle cable to
decrease the vehicle speed.
3. COAST CONTROL
During cruise control driving, while the coast SW is on, the cruise control actuator returns the throttle cable to close the
throttle valve and decrease the driving speed. The vehicle speed when the coast SW is turned off is memorized and the
vehicle continues at the new set speed.
4. ACCEL CONTROL
During cruise control driving, while the accel SW is turned on, the cruise control actuator pulls the throttle cable to open the
throttle valve and increase the driving speed.
The vehicle speed when the accel SW is turned off is memorized and the vehicle continues at the new set speed.
5. RESUME CONTROL
Unless the vehicle speed falls below the minimum speed limit (Approx. 40km/h, 25mph) after canceling the set speed by the
cancel SW, pushing the resume SW will cause the vehicle to resume the speed set before cancellation.
6. MANUAL CANCEL MECHANISM
If any of the following operations occurs during cruise control operation, the magnetic clutch of the actuator turns off and the
motor rotates to close the throttle valve and the cruise control is released.
*Placing the shift lever except D position (Park/Neutral position SW except D position). ºSignal is not input to TERMINAL 3
of the cruise control ECUº (A/T)
*Depressing the clutch pedal (Cruise control clutch SW off). ºSignal input to TERMINAL 3 of the cruise control ECUº (M/T)
*Depressing the brake pedal (Stop light SW on). ºSignal input to TERMINAL 2 of the cruise control ECUº
*Pushing the cancel switch (Cancel SW on). ºSignal input to TERMINAL 10 of the cruise control ECUº
*Pushing the cruise switch off ºsignal input to TERMINAL 11 of the cruise control ECUº.
SYSTEM OUTLINE

7. TAP±UP CONTROL FUNCTION
When the difference between the actual vehicle speed and the set speed is less than 5 km/h (3 mph), the set speed can be
increased 1.6 km/h (1 mph) each time by operation the RESUME/ACCEL SW quickly within 0.6 seconds.
8. TAP±DOWN CONTROL FUNCTION
When the difference between the actual vehicle speed and the set speed is less than 5 km/h (3 mph), the set speed can be
lowered 1.6 km/h (1 mph) each time by operating the SET/COAST SW quickly within 0.6 seconds.
9. AUTO CANCEL FUNCTION
A) If any of the following operating conditions occurs during cruise control operation, the set speed is erased, the current
flow to the magnetic clutch is stopped and the cruise control is released. (Cruise SW turns off).
When this occurs, the ignition SW must be turned off once before the cruise SW will turn on.
*When current continued to flow to the motor inside the actuator in the throttle valve ºOPENº direction.
*The motor does not operate despite the motor drive signal being output.
B) If any of the following operating conditions occurs during cruise control operation, the set speed is erased, the current
flow to the magnetic clutch is stopped and the cruise control is released. (Cruise SW turn off).
When this occurs, the cancel state is cleared as the cruise SW will turn on again.
*Over current to transistor driving the motor and/or the magnetic clutch.
*Open circuit in the magnetic clutch.
*Momentary interruption of vehicle speed signal.
*Short circuit in the cruise control SW.
*When the vehicle speed falls more than 16 km/h (10 mph) below the set speed, E.G. on an upward slope.
C) If any of the following conditions occurs during cruise control operation, the set speed is erased and the cruise control is
released. (The power to the magnetic clutch is cut off until the set SW is ON again.)
*When the vehicle speed falls below the minimum speed limit, approx. 40 km/h (25 mph).
*When power to the cruise control system is momentarily cut off.
D) If any of the following conditions occurs during cruise control operation, the cruise control is released.
*Open the circuit for TERMINAL 2 of the stop light SW.
10. AUTOMATIC TRANSAXLE CONTROL FUNCTION
*In overdrive. If the vehicle speed becomes lower than the overdrive cut speed (Set speed minus approx. 4 km/h, 2.5 mph)
during cruise control operation, such as driving up a hill, the overdrive is released and the power increased to prevent a
reduction in vehicle speed.
*After releasing the overdrive, vehicle speed becomes higher than the overdrive return speed (Set speed minus approx. 2
km/h, 1.2 mph) and the cruise control ECU judges by the signals from the actuator's potentiometer that the upward slope
has finished, the overdrive is resumed after approximately 2 seconds.
*During cruise control driving, the cruise control operation signal is output from the cruise control ECU to the engine control
module. Upon receiving this signal, the engine control module changes the shift pattern to normal.
To maintain smooth cruise control operation (on a downward slope etc.), the lock±up release of the transmission when the
idling point of the throttle position is ON is forbidden.
C3 CRUISE CONTROL ACTUATOR
3±4 : Approx. 38.5 W
C12 CRUISE CONTROL SW [COMB. SW]
5±3 : Continuity with the CRUISE SW on
4±3 : Approx. 418 W with the CANCEL SW on
Approx. 68 W with the RESUME/ACCEL SW on
Approx. 198 W with the SET/COAST SW on
C15 CRUISE CONTROL ECU
9±GROUND :10±14 volts with the ignition SW at ON position
12±GROUND :4 pulses with 1 rotation of rotor shaft
10±GROUND : Approx. 418 W with the CANCEL SW on in the cruise control SW
Approx. 198 W with the SET/COAST SW on in the cruise control SW
Approx. 68 W with the RESUME/ACCEL SW on in the cruise control SW
16±GROUND : Always continuity
SERVICE HINTS

C 2C1C8C7A25 A12 C5C4C12 C6A10 A14
A 12 A6A11 A5A10 A4A7A2A8A1B5B3
M
B 2B1
E 1 SFLH SFLR SRRH SRRR SRLH SRLR SRC1 SRC2 SMC1 SMC2 AST MT
AST MT SMC2 SMC1 SRC2 SR C1 SRLR SRLH SRRR SRRH SFLR SFLH
GN D BM
L±B
W±L
W±R
R±G
G± Y
LG±B
B±R
B±Y
Y±R
Y±B
R
R±W
W± RW± RW±B
15A
E CU±IG FROM POWER SOURCE SYSTEM (
SEE PAGE 50)
1J 9
B 815A
STOP
1C 7
1 2
1R 41R 5A A
B C
B 16 JUNCTION
CONNECTOR J12
STOP
LIGHT SW S 6
JUNCTION
CONNECTOR
ABS AND TRACTION ECU C C
B±R
W
G± WB±R
G± WG±W
R±L R±L
W± BW±B IG1STP
ABS AND TRACTION ACTUATORA 15GND1
W± B
A15 BA, A16 C, A17
B A 7 A , A 8B J27 A , J28

ABS AND TRACTION CONTROL
(ABS)
ABS is a brake system designed for the purpose to improve the operating ability securing the stability of the vehicle by
preventing the looking±up of the vehicle controlling the wheel cylinder pressure of all the four wheels at the time of sudden
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 and traction ECU.
(2) Stop light SW signal
A signal is input to TERMINAL STP of the ABS and traction ECU when brake pedal is depressed.
2. SYSTEM OPERATION
When the wheels are to be locked±up, the solenoid inside the actuator will be controlled by the signal from the ABS and
traction ECU and the brake fluid in the wheel cylinder will flow through the reservoir and reduce the hydraulic pressure.
While the ABS is in operation, as the ABS and traction ECU always outputs the operation signal to the pump inside the
actuator, brake fluid stored inside the reservoir will be suctioned up by the pump inside the actuator and returned to the
master cylinder.
When the hydraulic pressure of the wheel cylinder is decompressed or increased until the necessary hydraulic pressure, the
solenoid inside the actuator is controlled by the control signal from the ABS and traction ECU and as a result, hydraulic
pressure of the wheel cylinder will be closed at both routes of the master cylinder and reservoir sides and the hydraulic
pressure of the wheel cylinder will become to be in the holding condition.
If the increase of hydraulic pressure volume of the wheel cylinder becomes necessary, with the control signal from the ABS
and traction ECU, the solenoid inside the actuator will be controlled and become the same condition as usual and the brake
fluid of the master cylinder will be sent to the wheel cylinder and will increase the hydraulic pressure of the wheel cylinder. At
this time, in the case that the brake fluid stays left in the reservoir, it will be sucked up by the pump inside the actuator and
will be sent to the wheel cylinder.
Also, increasing speed of the hydraulic pressure is controlled by outputting the increasing and the said holding one after
another.
(Traction control)
Traction control system is designed to perform the engine output control by the fuel cut and hydraulic pressure control of
driving wheel brake and control the spinning of the driving wheels. By doing this, it improves starting acceleration and
operating ability of the vehicle securing the driving ability in accordance with the road surface condition.
3. TRACTION CONTROL OPERATION
Estimating the vehicle speed from the rear wheel speed, comparing it with the front, driving wheel speed and judging the grip
condition of the driving wheels. From the estimated vehicle speed, target speed of the driving speed will be set. When the
front, driving wheel speed exceeds the control starting speed, it judges that the tire slip is occurred and performs the fuel cut
cylinder number control and brake control and then adjust to make the front wheel speed become the traction control target
speed. Controlling of the traction control will be completed when the vehicle move onto the road where the driving wheels will
not have a tire slip or when the driver decelerate.
ABS MOTOR RELAY [R/B NO.3]
3±4 : Approx. 62 W
ABS SOL RELAY [R/B NO.3]
4±6 : Approx. 80 W
A9, A10 ABS SPEED SENSOR FRONT LH, RH
1±2 :0.6 kW±2.5 kW
A15 (A), A16 (B), A17 (C) ABS AND TRACTION ECU
(B) 8±GROUND : Approx. 12 volts with the ignition SW at ON position
(B)11±GROUND : Continuity with the ignition SW on and the traction off SW on (Traction control off)
(B)16±GROUND : Approx. 12 volts with the brake pedal depressed
(A)15, (C) 9, (C) 10±GROUND : Always continuity
A25, A26
ABS SPEED SENSOR REAR LH, RH
1±2 :1.2 kW±2.3 kW
T2 THROTTLE POSITION SENSOR
1±2 :3.5 kW±5.0 kW
SYSTEM OUTLINE
SERVICE HINTS

1 2 1 2 1D 21C7 1J 9
IL1 1 IL1 2 ID1 9 ID1 3
2 1 2 1 B 22 B910B23 B 13 B5 B 11FROM POWER SOURCE SYSTEM (
SEE PAGE 50)
R±L
B±R B±R
G±W G±WR±L
R
G G R
W
BW
B
ABS SPEED SENSOR
FRONT LHABS SPEED SENSOR
FRONT RH D D10A
GAUGE
ABS WARNING
LIGHT
[COMB. METER]
ABS SPEED SENSOR
REAR LHABS SPEED SENSOR
REAR RH 15A
ECU±IG15A
STOP
ABS ECUA 9 A10R±L
J 4
JUNCTION
CONNECTOR
C10
B
A25 A261R 51R 4
STOP LIGHT SW
W G± W1 2S 6
IGB 12 B 25
A
JUNCTION
CONNECTOR J11
W±B W±B
IG3 12
C7
C4
G±B G± B
B CA A
C CCIK2 1IK26
A 9 A 3 A 2 A 8
R
G
W
BGRJUNCTION
CONNECTOR JUNCTION
CONNECTOR J29
JUNCTION
CONNECTOR J12
G± B
GND2 GNDSTP
RL± RR±FL ± FR± FL + FR+
RR+ RL+ IG1 WAB J27 A , A28
B A18 A , A19

ABS (TMC MADE)
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.
A9, A10 ABS SPEED SENSOR FRONT LH, RH
2±1 :0.6 kW±2.5 kW
A25, A26 ABS SPEED SENSOR REAR LH, RH
2±1 :1.2 kW±2.3 kW
A18 (A), A19 (B) ABS ECU
(Connect the ABS ECU connectors)
(B)21±GROUND : Approx. 12 volts with the ignition SW at ON position and the data link connector 1
TS±E1, TC±E1 not connected
(B) 8±GROUND : Approx. 12 volts with the ignition SW at ON position and the data link connector 1
TS±E1, TC±E1 not connected
(B)13±GROUND : Approx. 12 volts with the ignition SW at ON 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
A4A26 (1MZ±FE)A2532J1131A4A28 (5S±FE)A2632J1231
A5B26 (1MZ±FE)C1030J2231A5B28 (5S±FE)D126 (1MZ±FE)J2331
A926 (1MZ±FE)D128 (5S±FE)J27A31A928 (5S±FE)D430J28B31
A1026 (1MZ±FE)J331J2931A1028 (5S±FE)J431S631
A18A30J7A31
A19B30J8B31
: RELAY BLOCKS
CodeSee PageRelay Blocks (Relay Block Location)
325Engine Room R/B No.3 (Radiator Upper Support RH)
SYSTEM OUTLINE
SERVICE HINTS

ABS (TMMK MADE)
IK 2 1IK26IK213
1 2 1 2
W
GR
ABS SPEED SENSOR
FRONT LHABS SPEED SENSOR
FRONT RH
G±W
(
SHIELDED)(
SHIELDED)
A 9 A10
R
G
1R 4
1R 515A
STOP
1C 710A
GAUGE FROM POWER SOURCE SYSTEM (
SEE PAGE 50)
1D 215A
ECU±IG
1J 9
4 7
IK3 1 IK3 10
B C
A AIG3 12DC
R±L R±L
D
1 2
R±L
C C
C
R±L R±LG± W
R±LIK3 5
1560A
FL ABS
21
3
(
SHIELDED) (
SHIELDED)
W
BG± WR±L
G±W
W±B 211476 54
JUNCTION
CONNECTOR
A BS WARNING LIGHT
[COMB. METER] C10STOP LIGHT SW S 6
JUNCTION
CONNECTOR J 4
JUNCTION
CONNECTOR J1 2
JUNCTION
CONNECTOR J29C
B±R B±R B±R
L
L
17 18
IG1 +B +BR±L
E 2 FR± FL± WA FL+ FR+STP
B J27 A , J28ABS ACTUATOR AND ECU A 6

ABS (TMMK MADE)
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 actuator and ECU.
(2) Stop light SW signal
A signal is input to TERMINAL STP of the ABS actuator and ECU when the brake pedal is depressed.
2. SYSTEM OPERATION
During sudden braking the ABS actuator and 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 actuator and 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 actuator and 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.
A9, A10 ABS SPEED SENSOR FRONT LH, RH
2±1 : Approx. 1.6 kW
A25, A26 ABS SPEED SENSOR REAR LH, RH
2±1 : Approx. 1.6 kW
A6 ABS ACTUATOR AND ECU
(Connect the ABS actuator and ECU connectors)
12±GROUND : Approx. 12 volts with the ignition SW at ON position and the data link connector 1
TS±E1, TC±E1 not connected
11±GROUND : Approx. 12 volts with the ignition SW at ON position and the data link connector 1
TS±E1, TC±E1 not connected
16, 19±GROUND : Always continuity
15±GROUND : Approx. 12 volts with the ignition SW at ON position
14±GROUND : Approx. 12 volts with the brake pedal depressed
17, 18±GROUND : Always approx. 12 volts
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
A626 (1MZ±FE)C1030J1231A628 (5S±FE)D126 (1MZ±FE)J2231
A926 (1MZ±FE)D128 (5S±FE)J2331A928 (5S±FE)D430J27A31
A1026 (1MZ±FE)J331J28B31A1028 (5S±FE)J431J2931
A2532J7A31S631
A2632J8B31
: RELAY BLOCKS
CodeSee PageRelay Blocks (Relay Block Location)
325Fusible Link Block (Radiator Upper Support RH)
SYSTEM OUTLINE
SERVICE HINTS

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, side airbag assembly, seat belt pretensioner,
center airbag sensor assembly, front airbag sensor assembly or side 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, side airbag assembly, seat belt pretensioner, center airbag sensor assembly, front airbag sensor assembly
and side 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, side airbag assembly, seat belt
pretensioner, center airbag sensor assembly, front airbag sensor assembly or side airbag sensor assembly in order to
reuse it.

If the steering wheel pad, front passenger airbag assembly, side airbag assembly, seat belt pretensioner, center airbag
sensor assembly, front airbag sensor assembly or side 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.

C 12 C10 C9C7
2 1A 2A1
2 1C 2C1
2 1C 5C6 13 12
IG2 2
A AII3 7II311
C CA C
B B
II3 6
A A
EC B 12 B 3B19 511 3
1234
B
3 AB
B
4
7
A AB TC E1
E1 TC
SILP
L±Y
LG
GR
LG
LG±R
BR LG
LG±R B±Y
P±B
LG±R BR BR BR BRWY Y±B
W
BR
W±R
LG
PRETENSIONER
LH P2 4
SIDE AIRBAG
SQUIB RH S1 0
PRETENSIONER
RH P2 5 DATA LINK
CONNECTOR 1 D 1
JUNCTION
CONNECTOR J23 JUNCTION
CONNECTOR J 3
S RS WARNING
LIGHT
[COMB. METER] C 9
JUNCTION
CONNECTOR J 3
DATA LINK
CONNECTOR 3 D 5
DATA LINK
CONNECTOR 2 D 4
SIDE AIRBAG
SENSOR RH S 8
LG
C17
CENTER AIRBAG SENSOR ASSEMBLYB A, C18 C, C19
J 7
JUNCTION
CONNECTORB A, J 8
* 1 : TMC MA DE
* 2 : TMMK MADE
* 3 : W/ SIDE AIRBAG* 4 : TMMK MADE 1MZ±FE
* 5 : EXCEPT * 4
Y±R
(
*2 *3) Y±R
(
*2 *3)
Y± G
(
*2 *3) Y±G
(
*2 *3)
BW1 1BW12
Y±R
(
*1 *3)
Y±G
(
*1 *3)(
*3)
(
*3)
(
*3)
(
*3)
B± Y
(
*4)
P± B
(
*4) (
*5)
(
*5)
J22(
1MZ±FE)
(
5S±FE)
Y±B(
*1)
L±B(
*2)
Y