TOYOTA CAMRY 1999 Service Repair Manual

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

: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CodeSee PageJunction Block and Wire Harness (Connector Location)
1C20Cowl Wire and Instrument Panel J/B (Lower Finish Panel)
1D20Instrument Panel Wire and Instrument Panel J/B (Lower Finish Panel)
1J20Cowl Wire and Instrument Panel J/B (Lower Finish Panel)1R20Cowl 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)
ID140Floor Wire and Cowl Wire (Left Kick Panel)
IG340Instrument Panel Wire and Cowl Wire (Under the Blower Motor)
II342Engine Wire and Cowl Wire (Under the Blower Motor)
IK142Engine Room Main Wire and Cowl Wire (Right Kick Panel)IK242Engine Room Main Wire and Cowl Wire (Right Kick Panel)
IL142Floor No.2 Wire and Cowl Wire (Right Kick Panel)
: GROUND POINTS
CodeSee PageGround Points Location
EA36 (1MZ±FE)Right Radiator Side SupportEA38 (5S±FE)Right Radiator Side Support
EC36 (1MZ±FE)Surge Tank RHEC38 (5S±FE)Intake Manifold
IG40Instrument Panel Brace LH
: SPLICE POINTS
CodeSee PageWire Harness with Splice PointsCodeSee PageWire Harness with Splice Points
E136 (1MZ±FE)Engine Room Main WireE138 (5S±FE)Engine Room Main Wire
12
34X1234
56781212
1 21 2
123X56
7 8 9 10 11 12
12
XX5 XX8 91011 12 13
14 15
XXXX X21222324 25 26


7

4





GRAY BLACK GRAY GARY
A18 (A)
A19 (B) A25 A26
BROWN
A4 (A) A5 (B) A9 A10
C10

ABS (TMC MADE)
XX

X
X
X
XX11

XXX
16 X XX X
23 22X
XX

X
X
X
XX11

XXX
16 X XX X
23 22X
X X 3 4 X XX X X
X X X14 X X



B




BBBB

X X






DDDX










CCC
AA AA
AAAAAAA







BBB



AA
AAAA





CCC




1

2


AA AA
AAAAAA A










CCC










AA














CC






BLUE (5S±FE) BLACK
(1MZ±FE) BLACK
J3BLACK GRAYGRAY
J11BLACKJ22
(Hint : See Page 7)(Hint : See Page 7)
(Hint : See Page 7)(Hint : See Page 7)
(Hint : See Page 7)(Hint : See Page 7)
(Hint : See Page 7)DARK GRAY
J23
J27 (A) J28 (B) J29
(Hint : See Page 7)
(Hint : See Page 7) (Hint : See Page 7)(Hint : See Page 7)
D1 D1 D4
J4 J7 (A)J8 (B)
J12
S6

MEMO

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

IL1 1 2 IL1 3 ID1 4 ID1 9 ID1 3
2 1 2 1
Y
BR BRY
P
LP
L
ABS SPEED SENSOR
REAR LH(
SHIELDED)
(
SHIELDED)
ABS SPEED SENSOR
REAR RH A25 A26(
SHIELDED) IK3 3IK39IK38IK37IK32IK36 E 1 E 1
EAB
B4 14 11 16
B
IK2 12 IK25II3 8 II3 11
12 11
191698 21DATA LINK CONNECTOR 2 D 4
DATA LINK CONNECTOR 1 D 1
ABS ACTUATOR AND ECU A 6 R±L
R±Y LG±RR±L
LG±R LG±R
R±Y R±Y
GND2 GND1
(
SHIELDED)(
SHIELDED)
(
SHIELDED) (
SHIELDED)
W± B W± B
W±B W±B W± B
(
SHIELDED)
(
SHIELDED)
L P BRY
ABS TC TC TS
W± BLG±R
JUNCTION
CONNECTOR J 3
E 1
ECII3 6 E1
BR
BR BR BR
A 3
JUNCTION
CONNECTOR J2 3(
5S±FE) J2 2(
1MZ±FE)
RR± RL±TS TC
RL+ RR+A C
B B
JUNCTION
CONNECTOR
IL1A B J 7 A , J 8
LG±R
(
*1)
P±B
(
*2)
* 1 : 5S±FE
* 2 : 1MZ±FE

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

: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CodeSee PageJunction Block and Wire Harness (Connector Location)
1C20Cowl Wire and Instrument Panel J/B (Lower Finish Panel)
1D20Instrument Panel Wire and Instrument Panel J/B (Lower Finish Panel)
1J20Cowl Wire and Instrument Panel J/B (Lower Finish Panel)1R20Cowl 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)
ID140Floor Wire and Cowl Wire (Left Kick Panel)
IG340Instrument Panel Wire and Cowl Wire (Under the Blower Motor)
II342Engine Wire and Cowl Wire (Under the Blower Motor)
IK242Engine Room Main Wire and Cowl Wire (Right Kick Panel)IK342Engine Room Main Wire and Cowl Wire (Right Kick Panel)
IL142Floor No.2 Wire and Cowl Wire (Right Kick Panel)
: GROUND POINTS
CodeSee PageGround Points Location
EA36 (1MZ±FE)Right Radiator Side SupportEA38 (5S±FE)Right Radiator Side Support
EC36 (1MZ±FE)Surge Tank RHEC38 (5S±FE)Intake Manifold
: SPLICE POINTS
CodeSee PageWire Harness with Splice PointsCodeSee PageWire Harness with Splice Points
E136 (1MZ±FE)Engine Room Main WireE236 (1MZ±FE)Engine Room Main WireE138 (5S±FE)Engine Room Main WireE238 (5S±FE)Engine Room Main Wire
1 2 X 4 5 6 7 8 9 X 11 12 X 14 15
X 21 X X X X X
X X X X X16 17 18 1912121 2 BLACK GRAY GRAY
A25
1 2XX

X
X
X
XX11

XXX
16 X XX X


X


7
4







A26BROWN (1MZ±FE) BLACK
A6 A9 A10
C10 D1

ABS (TMMK MADE)
XX

X
X
X
XX11

XXX
16 X XX X


X
AA AA
AAAAAAA
X X






DDDX


B




BBBB












CCC
X X 3 4 X XX X X
X X X14 X X








BBB



AA AA
AAAAAAA
AA

















CCC




(Hint : See Page 7) (5S±FE) BLACK DARK GRAY
J3
BLACKGRAY GRAYBLACK
J22 J23 J27 (A)
(Hint : See Page 7) (Hint : See Page 7)(Hint : See Page 7) (Hint : See Page 7)
(Hint : See Page 7)
(Hint : See Page 7) (Hint : See Page 7)










CCC














CC







1

2

BLUE
J29J28 (B)
(Hint : See Page 7)
(Hint : See Page 7)
D1 D4
J4J7 (A) J8 (B)
J12
S6

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.