1999 TOYOTA CAMRY sensor

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.

SRS
5A
IGN
1N 415A
CIG FROM POWER SOURCE SYSTEM (
SEE PAGE 50)
1N 210A
ECU±B
2J 7
1G2
1W3
B 5B6A7A9A10 A12
1N 1
1J 71N 3
1V 3
IG IE AB 27 B28
12
SPIRAL
CABLE
2 121 B 14 B13 B10 B11 A5A6 1234
B±O
GR
P±L
L±W
LG±B
GR ±L Y±GY±RY Y±B W±B W±B W±B
W±B
W±R W±R
AIRBAG SQUIB
(
STEERING
WHEEL PAD) A23
AIRBAG SQUIB
(
FRONT PASSENGER
AIRBAG ASSEMBLY) A22
SIDE AIRBAG
SQUIB LH S 9
J UNCTION
CONNECTOR J11SIDE AIRBAG
SENSOR LH S 7
C17
CENTER AIRBAG SENSOR ASSEMBLYB A, C18 C, C19 B 26 B15 B20 B9 IT1 1IT12IU11IU12
BR BR
W± R
BR±W
B±W W±R
BR±W
B± W
AIRBAG SENSOR
FRONT L H A31
AIRBAG SENSOR
FRONT RH A32
(
*3)
(
*3)
(
*3)
(
*3) Y±R
(
*1 *3)
Y±R
(
*1 *3) Y±R
(
*2 *3) Y±R
(
*2 *3)
Y±G
(
*2 *3) Y± G
(
*2 *3)
BV1 1BV12 CONNECTION
DETECTION
PIN
2 1BA
CONNECTION
DETECTION
PIN
2 1BA

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

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.
When the side impact also exceeds a set level, current from the CIG or IGN fuse flows to TERMINALS (A) 5, (C) 2, (A) 2 and
(C) 5 of the center airbag sensor assembly to TERMINAL 1 of the side airbag squibs and the pretensioners to TERMINAL 2
to TERMINALS (A) 6, (C) 1, (A) 1 and (C) 6 of the center airbag sensor assembly to TERMINAL (B) 27, (B) 28 or BODY
GROUND to GROUND, causing side airbag squibs and the pretensioners 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.
Side airbags are instantaneously expanded to soften the shock of side to the driver and front passenger.
The pretensioners make sure of the seat belt restrainability.
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
A2230D430P2433
A2330D530P2533
C930J331S733
C17A30J7A31S833
C18B30J8B31S934
C19C30J1131S1034
D126 (1MZ±FE)J2231D128 (5S±FE)J2331
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CodeSee PageJunction Block and Wire Harness (Connector Location)
1G20Instrument Panel Wire and Instrument Panel J/B (Lower Finish Panel)
1J
1N20Cowl Wire and Instrument Panel J/B (Lower Finish Panel)1V20Cowl Wire and Instrument Panel J/B (Lower Finish Panel)
1W
2J22Cowl 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)
IG240Instrument Panel Wire and Cowl Wire (Lower Finish Panel)
II342Engine Wire and Cowl Wire (Under the Blower Motor)
IT142Cowl Wire and Cowl Wire (Left Kick Panel)
IU142Engine Room Main Wire and Cowl Wire (Right Kick Panel)
BV146Floor Wire and Seat No.1 Wire (Under the Driver's Seat)
BW146Floor No.2 Wire and Seat No.2 Wire (Under the Front Passenger's Seat)
: GROUND POINTS
CodeSee PageGround Points Location
EC36 (1MZ±FE)Surge Tank RHEC38 (5S±FE)Intake Manifold
IE40Cowl Side Panel LH
IG40Instrument Panel Brace LH
SYSTEM OUTLINE

COMBINATION METER
10A
GAUGEFROM POWER SOURCE SYSTEM (
SEE PAGE 50)
1D 27. 5A
DOME
2J 12
1J 1
1G 81W 1
IF2 3IF24IJ17IJ12IJ13IJ16 IG3 6IG3 10 C 7B 14 B11
B 6B3C5C8B15 C6B10 A2A1C2
FUEL
TACHO
SPEEDOMETER
WATER TEMP.
1 II2 2IG33
IF2 1
IH1 JUNCTION
CONNECTOR J 4
JUNCTION
CONNECTOR J28
FUEL SENDER F1 4JUNCTION
CONNECTOR J15JUNCTION
CONNECTOR J1 6
WATER
TEMP.
SENDER W 3
VEHICLE SPEED SENSOR
(
COMBINATION METER) V 2
JUNCTION
CONNECTOR J24
FROM ENGI NE
CONTROL MODULE
TO DOOR
COURTESY SW
TO ENGI NE
CONTROL MODULETO ENGI NE
CONTROL MODULE
TO CRUISE
CONTROL ECU R±L
R±L R±L
V±W
V±W V±W
R R±L R±L
Y±R
G±WY±R
G±W
BR
B±O
L
P
R±W
BR
Y±G
G± R BR BR
BR
B±O
L
P R±L
BR BR
Y±G
G± R
R±L
V±W
R±L FF
DB
232B
DBEE
3
1
FUEL
DOOR
MALFUNCTION
INDICATOR LAMPTRIP METER
ODOMETER
SI SE
IG+
ED : * 1
EC : * 221
DIODE
(
DOME) D10
R±YR R
J21(
*2)
(
*1)
AA C 8
COMBINATION METERB A, C 9 C, C10
TO A/C CONTROL
AS SE MB LY V±W
,

5A
STARTER FROM POWER SOURCE SYSTEM (
SEE PAGE 50)
1J 3
IJ1 5IF2 5 IG2 5IG317 IG23
IK2 3 C 9B 2
B 5C10 A4C4C11 A3B7C3A5A12
EB 2 1 II2 11A B
B C
IG1 6
11
IG1 7
12 1
IG
R±Y
B±W
GR
B±O Y±B Y±B
O O
R±W
R±L
P±L
Y±G P±L P±L W±B
Y±G
R±W R±W R±W
R±W W±B
B±W
B±WB±W
B±O
R±W
R±W R±W
R±W PARK /NEUTRAL
POSITION SW P 1
OIL PRESSURE
SW O 1
PARKING
BRAKE SW P 3 CLUTCH START SW C 7
WASHER LEVEL
WARNING SW W 1
JUNCTION
CONNECTOR J 2
BRAKE FLUID
LEVEL WARNING SW B 2
JUNCTION
CONNECTOR J11L
LG
G± O
B5
B B6
2B B
BFROM THEFT
DETERRENT ECU SECURITY
OIL
CRUISE
SEAT BELT
ABS
WASHER LEVEL
REAR LIGHTS
BRAKE
BULB
CHECK
RELAY
TRAC OFF
SLIP
O/D OFF
(
A/T)
(
M/T) JUNCTION
CONNE CTOR J29
(
M/T) (
A/T)
P
N
(
*5)
(
*6) (
*3)
(
*4)
(
*4)PKB BRK
A
TO CRUISE
CONTROL ECU
TO INTEGRATION
RELAY
TO ABS ECU
TO ABS AND TRACTION ECU
TO ABS ACTUATOR AND ECU
TO LI GHT
FAI LURE
SENSORTO ABS AND
TRACTION
ECU
GR
(
A/T)
II2 10
GR
B±O
B±O(
*5 A/T)
(
*6 A/T)
TO O/D
MAIN SWJ 7
JUNCTION
CONNECTORB A, J 8
C 8
COMBINA TION METERB A, C 9 C, C10* 1 : 1 MZ± FE
* 2 : 5S±FE
* 3 : W/O DAYTIME RUNNING LIGHT
* 4 : W/ DAYTIME RUNNING LIGHT
* 5 : TMC MADE
* 6 : TMMK MADE
B 4(
*2) A 18(
*1)
A 8(
*1)
B 14(
*2)
B D 6 , A
DAY TIME RUNNING
LIGHT RELAY (
MAIN)

7. 5A
PANEL
1D 510A
ECU±B FROM POWER SOURCE SYSTEM (
SEE PAGE 50)
2J 7
B 12 B8
B 13 B9 1G 2IG1 3
W±R W±R
R±L
G LG
W± B
G
G
W± BR±L
R±W(
*3)
(
*4)FROM HEADLIGHT LH, RH
FROM DAYTIME RUNNING
LIGHT RELAY (
MAIN)
TO CENTER AIRBAG
SENSOR ASSEMBLYSRS
HIGH BEAM
* 3 : W/O DAYTIME RUNNING LIGHT
* 4 : W/ DAYTIME RUNNING LIGHT
G
AAA
JUNCTION
CONNECTOR J30
C 8
COMBINATION METERB A, C 9 C, C10
* 5 : TMC MADE
* 6 : TMMK MADE
1W 3