1999 TOYOTA CAMRY relay

ENGINE CONTROL
2. CONTROL SYSTEM
*SFI system
The SFI system monitors the engine condition through the signals, which are input from each sensor to the engine
control module. The best fuel injection volume is decided based on this data and the program memorized by the engine
control module, and the control signal is output to TERMINALS #10+, #20+, #30+ and #40+ of the engine control
module to operate the injector. (Inject the fuel). The SFI system produces control of fuel injection operation by the engine
control module in response to the driving conditions.
*ESA system
The ESA system monitors the engine condition through the signals, which are input to the engine control module from
each sensor the best ignition timing is detected according to this data and the memorized data in the engine control
module, and the control signal is output to TERMINALS IGT1 and IGT2. This signal controls the igniter to provide the
best ignition timing for the driving conditions.
*IAC system
The IAC system (Step motor type) increases the RPM and provides idling stability for fast idle±up when the engine is
cold and when the idle speed has dropped due to electrical load, etc. The engine control module evaluates the signals
from each sensor, outputs current to TERMINAL RSD , and controls the idle air control valve.
*Fuel control system
The engine control module operation outputs to TERMINAL FC and controls the CIR OPN relay. Thus controls the fuel
shutoff valve open and close.
*EGR control system
The EGR control system controls the VSV (EGR) by evaluating the signals from each sensor which are input to the
engine control module and by sending output to TERMINAL EGR of the engine control module.
*A/C conditioning operation system
In addition to the conventional A/C cut control, the engine control module performs the air conditioning operation as well
since the A/C amplifier function is built in it.
3. DIAGNOSIS SYSTEM
With the diagnosis system, when there is a malfunctioning in the engine control module signal system, the malfunction
system is recorded in the memory. The malfunctioning system can then be found by reading the display (Code) of the
malfunction indicator lamp.
4. FAIL±SAFE SYSTEM
When a malfunction occurs in any system, if there is a possibility of engine trouble being caused by continued control based
on the signals from that system, the fail±safe system either controls the system by using data (Standard values) recorded in
the engine control module memory or else stops the engine.
E4 (A), E5 (B), E6 (C), E7 (D) ENGINE CONTROL MODULE
BATT±E1 : Always 9.0±14.0 volts
+B±E1 :9.0±14.0 volts with the ignition SW at ON or ST position
VC±E2 :4.5± 5.5 volts with the ignition SW on
VTA±E2 :0.3± 0.8 volts with the ignition SW on and throttle valve fully closed
3.2±4.9 volts with the ignition SW on and throttle valve open
PIM±E2 :3.3± 3.9 volts with the ignition SW on
THA±E2 :0.5±3.4 volts with the ignition SW on and intake air temp. 20°C (68°F)
THW±E2 :0.2± 1.0 volts with the ignition SW on and coolant temp. 80°C (176°F)
STA±E1 :6.0±14.0 volts with the engine cranking
W±E1 :9.0±14.0 volts with the no trouble and engine running
TE1±E1 :9.0±14.0 volts with the ignition SW on
NSW±E1 :0± 3.0 volts with the ignition SW on and Park/Neutral position SW position P or N position
9.0±14.0 volts with the ignition SW on and except Park/Neutral position SW position P or N position
IGT1, IGT2±E1 : Pulse generation with the engine cranking or idling
#10+, #20+, #30+, #40+±E01, E02 :9.0±14.0 volts with the ignition SW on
SERVICE HINTS

: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
A828F828J931
A1130F9A28J1231
A1230F11C28J1531
C128F1732J1831
C228H630J1931
C530H730J2031
C11B30I129J2131
C12C30I229J2231
D128I329J23A31
D330I429J24B31
D630I529J3432
E328I629M129
E4A30I729P129
E5B30I829P229
E6C30I1030S431
E7D30J231T129
F428J331V129
F528J6A31V229
F628J7B31
F728J831
: RELAY BLOCKS
CodeSee PageRelay Blocks (Relay Block Location)
126Engine Room R/B No.1 (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CodeSee PageJunction Block and Wire Harness (Connector Location)
1B22Cowl Wire and Instrument Panel J/B (Lower Finish Panel)1C22Cowl Wire and Instrument Panel J/B (Lower Finish Panel)
1D22Instrument Panel Wire and Instrument Panel J/B (Lower Finish Panel)
1J
1K22Cowl Wire and Instrument Panel J/B (Lower Finish Panel)1R22Cowl Wire and Instrument Panel J/B (Lower Finish Panel)
1W
2A
2C24Engine Room Main Wire and Engine Room J/B No.2 (Engine Compartment Left)
2F
gg(g)
2J
2K24Cowl Wire and Engine Room J/B No.2 (Engine Compartment Left)
2L
g(g )
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CodeSee PageJoining Wire Harness and Wire Harness (Connector Location)
EB134Cowl Wire and Engine Room Main Wire (Under the Engine Room J/B No.2)
IB136Floor Wire and Cowl Wire (Left Kick Panel)
IF136Instrument Panel Wire and Cowl Wire (Under the Blower Motor)
IG1
IG238Engine Wire and Cowl Wire (Under the Blower Motor)
IG3
g()
IH138Engine Wire and Instrument Panel Wire (Under the Blower Motor)
IJ238Engine Room Main Wire and Cowl Wire (Right Kick Panel)

HEADLIGHT
15A
HEAD
(
LH)15A
HEAD
(
RH)
3
4
16 OFF
TAIL
HEAD
LOW
HIGH
FLASH
LIGHT
CONTROL
SW DIMMER SW
2K 82G32G4
R±B
HEAD
RELAY
IFIE R±B
R
W±BW±B
R±B
R±BB
INTEGRATION RELAY BATTERY
FL MAIN
3. 0W
I11
32 41
40A
MAIN
2B 31 2
2G 62C8
213
123
B FBFBDBD
A F A F A D
A 1C 1
1J 79 8IE1 3
A B
AA B
B
COMBINATION SW C15
HIGH B EAM INDICATOR LIGHT
[COMB. METER] C11
JUNCTION
CONNECTOR J 9JUNCTION
CONNECTOR J 4 JUNCTION
CONNECTOR J30
HEADLIGHT
LH H 1
HEADLIGHT
RH H 2
R±Y
JUNCTION
CONNECTOR J 6
W±B
W±B R±L R±LR±B
R±L
R±BR±L
R±W B±G
R±B
R±L
F 9
FUSIBLE LINK BLOCKC A, F11
J25
JUNCTION
CONNECTORB A, J26
8717 13
A A
1J 8
W±B

HEAD RELAY
2±1 : Closed with the light control SW at HEAD position or the dimmer SW at FLASH position
C15 COMBINATION SW
13±16 : Continuity with the light control SW at HEAD position
8±16 : Continuity with the dimmer SW at FLASH position
7±16 : Continuity with the dimmer SW at HIGH or FLASH position
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
C1130H228J25A31
C1530I1130J26B31
F9A28J431J3031
F11C28J631
H128J931
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CodeSee PageJunction Block and Wire Harness (Connector Location)
1J22Cowl Wire and Instrument Panel J/B (Lower Finish Panel)
2B
2C24Engine Room Main Wire and Engine Room J/B No.2 (Engine Compartment Left)
2G
gg(g)
2K24Cowl 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)
IE136Instrument Panel Wire and Cowl Wire (Lower Finish Panel)
: GROUND POINTS
CodeSee PageGround Points Location
IE36Left Kick Panel
IF36Instrument Panel Brace LH
SERVICE HINTS

LIGHT AUTO TURN OFF
40A
MAIN
2 12B 3
32 41
2K 8
B 3B B
R±B R±B
HEAD
RELAY
JUNCTION
CONNECTOR J30
A 1C 1F1F2 E 37. 5A
DOME FROM POWER SOURCE SYSTEM (
SEE PAGE 44)
2J 12
1W 1 23 15
1C 6 1B 4
B 2
IF 1J 71J8
OFF
TAI L
HEAD
LIGHT
CONTROL SW
B 1B4
11S 7
16 A
6 10
A71 AB±G
B±R
B±RB
B±R
G±R G±R
R R±GR±Y W± B
W± B
G
JUNCTION
CONNECTOR J 9
JUNCTION
CONNECTOR J 6
DOOR COURTESY SW
FRONT L H D 7 COMBINATION SW C15 FUSIBLE LINK BLOCKB
TAI LL I GHT
RELAY10A
GAU GE
BATTERY13 14
FL M AIN
3. 0W100A
ALT
C F 9 A , F1 1 F, F1425A
DOOR 1B 4
1D 1
B C
A A
A 13
L±W L±W
AAI11
INTEGRATION RELAYA B, I12 B±R
B±R
JUNCTION
CONNECTOR J 1
J31
JUNCTION
CONNECTORB A, J32
W± B

With the ignition SW turned on, the current flows to TERMINAL 7 of the integration relay through GAUGE fuse.
Voltage is applied at all times to TERMINAL (B) 2 of the integration relay through the TAILLIGHT relay coil side, and to
TERMINAL (B) 3 through the HEAD relay coil side.
1. NORMAL LIGHTING OPERATION

With the light control SW turned to TAIL position, a signal is input into TERMINAL (B) 1 of the integration relay. Due to this
signal, the current flowing to TERMINAL (B) 2 of the relay flows to TERMINAL (B) 1 to TERMINAL 14 of the light control SW
to TERMINAL 16 to GROUND, and TAILLIGHT relay causes taillights to turn on.

With the light control SW turned to HEAD position, a signal is input into TERMINALS (B) 1 and (B) 4 of the integration relay.
Due to this signal, the current flowing to TERMINALS (B) 3 and (B) 2 of the relay flows to TERMINALS (B) 4 and (B) 1 to
TERMINALS 13 and 14 of the light control SW to TERMINAL 16 to GROUND, and causes TAILLIGHT and HEAD relay to
turn the lights on.
2. LIGHT AUTO TURN OFF OPERATION
When the driver's door is opened with the lights on and the ignition SW off, the relay is activated, and the current flow from
TERMINAL (B) 2 of the relay to TERMINAL (B) 1, and from TERMINAL (B) 3 to TERMINAL (B) 4 are cut, and all the lights
are turned off.
HEAD RELAY
2±1 : Closed with the light control SW at HEAD position or the dimmer SW at FLASH position
TAILLIGHT RELAY
3±5 : Closed with the light control SW at TAIL or HEAD position
D7 DOOR COURTESY SW FRONT LH
1±GROUND : Continuity with the front LH door open
I11 (B), I12 (A)
INTEGRATION RELAY
7±GROUND : Approx. 12 volts with the ignition SW at ON or ST position
6±GROUND : Continuity with the front LH door open
1±GROUND : Always approx. 12 volts
10±GROUND : Always continuity
(A)13±GROUND : Always approx. 12 volts
(B) 2±GROUND : Always approx. 12 volts
(B) 3±GROUND : Always approx. 12 volts
(B) 4±GROUND : Continuity with the light control SW at HEAD position
(B) 1±GROUND : Continuity with the light control SW at TAIL or HEAD position
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
C1530I11B30J3031
D732I12A30J31A31
F9A28J131J32B31
F11C28J631
F14F28J931
SYSTEM OUTLINE
SERVICE HINTS

2 1
10 11
111 1 1W 11F51S91G81M21M11H11 1F61S12 1G41S7 1J 7
A 8
B DA E A E
IM1 8IM16 2 1 126 10
R±WR R R W± B
R±W
R±W
R
R±Y
R
G±R
R±W
R±W
R±W
R±W
R±G
R±G R±G
R±G R±GR±W R±W
R±G R±W
INTEGRATION RELAYA
JUNCTION
CONNECTOR
I 9
IGNITION KEY
CYLINDER LIGHTJUNCTION
CONNECTOR OPEN DOOR
WAR NIN G LI GHT
[COMB. METER]
DIODE
(
COURTESY) J16 C11
D 4 DOOR COURTESY SW
FRONT LH
DOOR COURTESY SW
FRONT RH DOOR COURTESY SW
REAR RH DOOR COURTESY SW
REAR LH D 9
D10
D 7
D 8
4
2 1
DIODE
(
DOME) D 5
A
A D
J31
JUNCTION
CONNECTORB A, J32
I12
J31
E EA D
A D 25A
DOOR FROM POWER SOURCE SYSTEM (
SEE PAGE 44)
1D 1B C
A 13 L±WL±W
J31
JUNCTION
CONNECTORB A, J32A A
R R

INTERIOR LIGHT
I12 (A) INTEGRATION RELAY
1±GROUND : Always approx. 12 volts
4±GROUND : Continuity with the one of each door (Front RH, rear LH and RH) open
6±GROUND : Continuity with the front LH door open
10±GROUND : Always continuity
(A) 8±GROUND : Continuity with the front RH door open
D7, D8, D9, D10 DOOR COURTESY SW FRONT LH, RH, REAR LH, RH
1±GROUND : Closed with the door open
L5 LUGGAGE COMPARTMENT LIGHT SW
1±GROUND : Closed with the luggage compartment door open
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
C1130D1032J1631
C1732F9A28J31A31
D430F11C28J32B31
D530I930L332
D732I12A30L432
D832I1332L532
D932J931
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CodeSee PageJunction Block and Wire Harness (Connector Location)
1D22Instrument Panel Wire and Instrument Panel J/B (Lower Finish Panel)
1F22Roof Wire and Instrument Panel J/B (Lower Finish Panel)
1G22Instrument 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)1M22Cowl Wire and Instrument Panel J/B (Lower Finish Panel)
1S22Floor Wire and Instrument Panel J/B (Lower Finish Panel)
1W22Cowl Wire and Instrument Panel J/B (Lower Finish Panel)
2A24Engine Room Main Wire and Engine Room J/B No.2 (Engine Compartment Left)
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)
IM138Floor No.2 Wire and Instrument Panel Wire (Right Kick Panel)
: GROUND POINTS
CodeSee PageGround Points Location
IF36Instrument Panel Brace LH
: SPLICE POINTS
CodeSee PageWire Harness with Splice PointsCodeSee PageWire Harness with Splice Points
B140Floor Wire
SERVICE HINTS