1994 TOYOTA CAMRY Wiring Diagrams Workshop Manual

217

218
ABS (ANTI±LOCK BRAKE SYSTEM) (TMM 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 BRAKEING.
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 BRAKE PEDAL IS OPERATED.
2. SYSTEM OPERATION
DURING SUDDEN BRAKEING THE ABS ECU, WHICH HAS SIGNALS INPUT FROM EACH SENSOR, CONTROLS THE CURRENT
FLOWING 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 ECU JUDGES THAT THE HYDRAULIC PRESSURE ACTING ON THE WHEEL CYLINDER IS INSUFFICIENT, THE CURRENT
ACTING ON THE SOLENOID IS CONTROLLED AND THE HYDRAULIC PRESSURE IS INCREASED. HOLDING OF THE HYDRAULIC
PRESSURE IS ALSO CONTROLLED BY THE ECU, BY THE SAME METHOD AS ABOVE. BY REPEATED PRESSURE REDUCTION,
HOLDING AND INCREASE ARE REPLATED TO MAINTAIN VEHICLE STABILITY AND TO IMPROVE STEERBILITY DURING SUDDEN
BRAKING.
A 8, A 9 ABS SPEED SENSOR FRONT LH, RH
1±2 : 0.8 K±1.3 KW
A19, A20 ABS SPEED SENSOR REAR LH, RH
1±2 : 1.1 K±1.5 KW
A 4(A), A 5(B) ABS ECU
(CONNECT THE ECU CONNECTORS)
(A)12±GROUND : APPROX. 12 VOLTS WITH IGNITION SW AT ON POSITION AND DATA LINK CONNECTOR 1 (CHECK CONNECTOR)
TS±EI NOT CONNECTED
(A)15±GROUND : APPROX. 12 VOLTS WITH IGNITION SW AT ON POSITION AND DATA LINK CONNECTOR 1 (CHECK CONNECTOR)
TS±EI NOT CONNECTED
(B) 4±GROUND : ALWAYS CONTINUITY
(B) 2±GROUND : APPROX. 12 VOLTS WITH IGNITION SW AT ON POSITION
(A) 9±GROUND : APPROX. 12 VOLTS WITH BRAKE PEDAL DEPRESSED
(B) 1±GROUND : ALWAYS APPROX. 12 VOLTS
SYSTEM OUTLINE
SERVICE HINTS

ABS ( ANTI – LOCK BRAKE SYSTEM) (TMM MADE)
-Memo
37

220
ELECTRIC TENSION REDUCER
1 2
1 2 1 2
1 2IS 1 3
BLTE NSI ON
RE DUCER
SOLENOID LHTENSION
REDUCER
SOLENOID RH
BUCKLE
SW LHBUCKLE
SW RH FROM POWE
R
GB±RB±R W±B
B7,B8 B10T3 T2B±R
B±R
IJ1 1
B±R
2 1
R±Y
D25
DIODE
(
FOR TENSION REDUCER)
W±B
15A
ECU±IG R SOURCE SYSTEM(
SEE PAGE 64)
1A 7
3A14
3D 53C 16

221
* 2 W/O POWER SEAT *
1 W/ POWER SEAT
B 7, B 8 BUCKLE SW LH
1±2 : CLOSED WITH DRIVER'S LAP BELT IN USE
B10 BUCKLE SW RH
1±2 : CLOSED WITH PASSENGER'S LAP BELT IN USE
T 2, T 3 TENSION REDUCER SOLENOID LH, RH
2±GROUND : APPROX. 12 VOLTS WITH IGNITION SW AT ON POSITION
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
B 732B1032T 235
B 832D2532T 335
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODESEE PAGEJUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1A20COWL WIRE AND J/B NO. 1 (INSTRUMENT PANEL LEFT)
3A24COWL WIRE AND J/B NO 3 (BEHIND COMBINATION METER)3C24COWL WIRE AND J/B NO. 3 (BEHIND COMBINATION METER)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODESEE PAGEJOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
IJ142FLOOR NO. 1 WIRE AND COWL WIRE
IS144FLOOR NO. 2 WIRE AND COWL WIRE
: GROUND POINTS
CODESEE PAGEGROUND POINTS LOCATION
46 (S/D)
BL48 (C/P)UNDER THE LEFT QUARTER PILLARBL
50 (W/G)
UNDER THE LEFT QUARTER PILLAR
12 1212
12 12 B8 B10 T2 T3D25BLACK
21
XXB7 (
*1)(
*2)
SERVICE HINTS

222
AUTO ANTENNA (S/D, C/P)*
1 : 6 SPEAKER
* 2 : 4 SPEAKER
W±B
AUTO ANTENNA MOTOR
AND CONTROL RELAY
BM A2 1M 145786 256431
R
2G 2
IU1 3 A A
R R R
JUNCTION
CONNECTOR J33
8
1OFF
B±R
L±R
RA DIO AND PLA YER(
*1)
RADIO SW
PLAYER
SW ON
B±R
P±L
II2 9 II2 13
IU1 1IU12
IU1 9IU110IM28
3
8
9OFF RADIO SW
PLAYER
SW ON 9
BB B
L±RB±R
L±R B±R
L±R
GR
W P±L B±R L±R B±R
P±L B±RGRR B±R FROM POWER S OURCE SY STE M(
SEE PAGE 64)
ACC
J UNCTION
CONNECTORSTEREO COMPONENT
AMPLIFIER
RA DIO AND PLA YER(
*2)
(
*2) (
*2)
(
*1) (
*1)
J3S8
R2
R3
L±Y
Y
R±G
B
R±W
W±B
23
LB 20A
DOME
W±B IM2 9 II2 3
R
1L 11L9 15A
ECU±IG15A
CIG/RADIO
1K 121C 1

223
A21 AUTO ANTENNA MOTOR AND RELAY
9±GROUND : APPROX. 12 VOLTS WITH IGNITION SW AT ON POSITION
5±GROUND : APPROX. 12 VOLTS WITH IGNITION SW AT ACC OR ON POSITION
7±GROUND : ALWAYS APPROX. 12 VOLTS
8±GROUND : APPROX. 12 VOLTS WITH IGNITION SW AT ACC OR ON POSITION AND RADIO SW ON
3±GROUND : CONTINUITY (UPPER LIMIT SW ON) UNLESS ANTENNA AT UP STOP
2±GROUND : CONTINUITY (DOWN LIMIT SW ON) UNLESS ANTENNA AT DOWN STOP
4±3 : CLOSED WITH IGNITION SW AT ACC OR ON POSITION AND RADIO SW ON AND PLAYER SW OFF UNTIL ANTENNA AT
UPPERMOST POSITION
1±2 : CLOSED WITH IGNITION SW AT ACC OR ON POSITION AND RADIO SW OFF AND PLAYER SW OFF UNTIL ANTENNA AT
LOWERMOST POSITION
1±2: CLOSED WITH IGNITION SW OFF UNTIL ANTENNA AT LOWERMOST POSITION
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
A2134 (S/D), 35 (C/P)R 233S 833
J 333R 333
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODESEE PAGEJUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1C
1K20COWL WIRE AND J/B NO. 1 (INSTRUMENT PANEL LEFT)
1L
20COWL WIRE AND J/B NO. 1 (INSTRUMENT PANEL LEFT)
2G22COWL WIRE AND J/B NO. 2 (ENGINE COMPARTMENT LEFT)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODESEE PAGEJOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
II242INSTRUMENT PANEL WIRE AND COWL WIRE
IM242INSTRUMENT PANEL WIRE AND CONSOLE BOX WIRE
IU144FLOOR NO. 2 WIRE AND INSTRUMENT PANEL WIRE
: GROUND POINTS
CODESEE PAGEGROUND POINTS LOCATION
BM46 (S/D)UNDER THE LEFT QUARTER PILLARBM48 (C/P)UNDER THE LEFT QUARTER PILLAR
12
34 56B B A A
AABBBB
3
8X3
89
X
X9 A21 J 3 R 2 R 3
S8BLUE
1
(
HINT : SEE PAGE 7)
SERVICE HINTS

224
AUTO ANTENNA (W/G)*
1 : 8 SPEAKER
* 2 : 6 SPEAKER
W±B
AUTO ANTENNA MOTOR
AND RELAY
BL A2 1
M 145786 256431
RR R
3
8
1OFF
B±R
L±R
RADIO A ND P LAY ER(
*1)
RADIO S W
PLAYER
SW ON
B±R
P±L
II2 9 II2 13
IG1 1IG12
IG1 9IG110IM28
3
8
9OFF RADIO S W
PLAYER
SW ON 9
BB B
L±RB±R
L±R B±R
L±R
GR
W P±L B±R L±R B±R
P±L B±RGR RB±R ACC
JUNCTION
CONNE CTORSTEREO COMPONENT
AMPLIFIER
RADIO A ND P LAY ER(
*2)
(
*2) (
*2)
(
*1) (
*1)
J3S8
R2
R3
L±Y
Y
R±G
B
R±W
W±B
23
LBW±B IM2 9
C C
JUNCTION
CONNECTOR J5
1H 61C 1
2G 21L11L9 FROM POWER SOURCE SYSTEM(
SEE PAGE 64)
15A
ECU±IG15A
CIG/RA DIO 20A
DOME