instrument panel TOYOTA CAMRY 1999 Service Repair Manual

F07156
Ignition
Switch
W24
AM1
IG1
B±YInstrument Panel J/B
19
1K
ECU±IG1JB±RJ/C
J12
C
CB±R13
A14ABS ECU
IG1
Instrument Panel J/B
21
1K
1B
AM1
B±R
FL Block
1
1
F9 F14
ALT
B±G
FL MAIN
Battery
IF A
Instrument
Panel Brace LH J9
Junction
ConnectorW±B
W±B12
A14
A1425GND1
GND2 DI±204
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM
DTC 41 IG Power Source Circuit
CIRCUIT DESCRIPTION
This is the power source for the ECU, hence the actuators.
DTC No.DTC Detecting ConditionTrouble Area
41
Condition 1. or 2. is detected:
1. Vehicle speed is at 3 km/h (1.9 mph) or more and ECU
terminal IG1 voltage is 9.5 V or less , which continues
for 10 sec. or more.
2. When IG1 terminal voltage is less than 9.5 V, there is
open circuit in the motor relay or in the solenoid relay, or
the solenoid circuit malfunction.

Battery

Charging system

Power source circuit
Fail safe function:
If trouble occurs in the power source circuit, the ECU cuts off current to the ABS solenoid relay and prohibits
ABS control.
WIRING DIAGRAM
DI03M±04

F00073
ECU±IGECU±IG
Instrument
Panel J/BECU±IG
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM
DI±205
INSPECTION PROCEDURE
1 Check ECU±IG fuse.
PREPARATION:
Remove ECU±IG fuse from Instrument Panel J/B.
CHECK:
Check continuity of ECU±IG fuse.
OK:
Continuity
NG Check for short circuit in all the harness and
components connected to ECU±IG fuse (See at-
tached wiring diagram).
OK
2 Check battery positive voltage.
OK:
Voltage: 10 ± 14 V
NG Check and repair the charging system (See Pub.
No. RM654U on page CH±1).
OK

F00124
Battery MAIN B±GF9 F141
ALT FL Block
B±R STOP Instrument Panel J/B
1C1B4
7Stop Light
Switch
2G±W
1R 1S5J23 J24J/C
Light Failure
Sensor
J/C
J34
BKBM
W±BG±W
A145
STPABS ECU
R
G±R
High
Mounted
Stop
LightRight
Stop
LightLeft
Stop
Light
A 1Instrument
Panel J/B
G±R W
11R
2 4
G±W
G±R
W±B
W±B
W±B AAC
W±B W±BH8 R10
R8
H8R8
R10 2
122
5 5 G±W
1
2 7
Under the
Left Center
PillarBack Panel
Center
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM
DI±207
DTC 49 Stop Light Switch Circuit
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
49
ABS ECU terminal IG1 voltage is 9.5 V to 18.5 V and ABS
is in non±operation, the open circuit of the stop light switch
circuit continues for 0.3 sec. or more.
Stop light switch

Stop light switch circuit
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check operation of stop light.
CHECK:
Check that stop light lights up when brake pedal is depressed and turns off when brake pedal is released.
NG Repair stop light circuit (See Pub. No. RM654U
on page BE±37).
OK
DI03N±04

F07217
Engine Room R/B No. 3
ABS Solenoid Relay
3
ABS
Actuator
A4 1
2
5 BatteryGAUGE Instrument Panel J/B
J/C
J3
D
ABS ECU 33 3 3
EA34 6
ABS ECUD
IJ28
R±L
IG3 4
DLC1 R±L
G±B
IG3 5 Short
Pin
W±B
ABS ECU W±L
G±B
C
CC R±L
R±L 1D2
7
4
R±L
A14WA IF1 12
11 G±B 4
G±B C12
C12
J/C
J22ABS Warning
Light
23
22 R±L
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM
DI±213
ABS Warning Light Circuit
CIRCUIT DESCRIPTION
If the ECU detects trouble, it lights the ABS warning light while at the same time prohibiting ABS control. At
this time, the ECU records a DTC in memory.
After removing the short pin of the DLC1, connect terminals Tc and E
1 of the DLC1 or DLC2 to make the
ABS warning light blink and output the DTC.
WIRING DIAGRAM
INSPECTION PROCEDURE
Troubleshooting in accordance with the chart below for each trouble symptom.
ABS warning light does not light upGo to step 1
ABS warning light remains onGo to step 3
1 Check ABS warning light.
See combination meter troubleshooting on page See Pub. No. RM654U on page BE±2.
NG Repair bulb or combination meter assembly.
OK
DI03Q±04

H02288
15A CIG
L±R 2Airbag Sensor
Assembly 2
3 4
6 7
6
3B±R
65A IGN
C5 1K
IF 1K
1N1N
C5 Instrument Panel J/B
30A AM2
W±R W±R1
4 40A AM1
2L
1K2A
1B
1K1B
55 W2
1
2 Instrument Panel J/B
AF14 F9F11 FL MAIN
B±G
100A
ALT
Instrument Panel J/B Junction
Connector
W±B7
1J 1NW±BC5
1 Battery
1 1
2
5
B±O
GR
ACCIG2 Fusible Link Block
27
E1 Ignition Switch1 B±RB
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±305
DTC Normal Source Voltage Drop
CIRCUIT DESCRIPTION
The SRS is equipped with a voltage±increase circuit (DC±DC converter) in the airbag sensor assembly in
case the source voltage drops.
When the battery voltage drops, the voltage±increase circuit (DC±DC converter) functions to increase the
voltage of the SRS to normal voltage.
The diagnosis system malfunction display for this circuit is different from other circuits that is when the SRS
warning light remains lit up and the DTC is a normal code, source voltage drop is indicated.
Malfunction in this circuit is not recorded in the airbag sensor assembly, and the source voltage returns to
normal, the SRS warning light automatically goes off.
DTC No.Diagnosis
(Normal)Source voltage drop
WIRING DIAGRAM
DI1BN±12

H02289
2 Airbag Sensor
Assembly
237
B±Y
12 IE2 LG
AB10A
ECU±B
Short Pin
W±R
1W Engine Room J/B No.2
11 B
A
A 3
LG
5DLC1 1 Battery
4 J2 Junction
Connector
1G2J 2A B±G
F9 F11 FL MAINFusible Link Block
1
1
TCP±B7Instrument Panel J/B
C5
B A LAW±R
LG
13
TC LG
LG±RIG3 LG±R11
B B
TC LG±R J2 Junction
Connector
19
DLC2 SRS Warning Light
IG3 C5 DI±308
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
SRS Warning Light Circuit Malfunction
CIRCUIT DESCRIPTION
The SRS warning light is located on the combination meter.
When the SRS is normal, the SRS warning light lights up for approx. 6 seconds after the ignition switch is
turned from the LOCK position to ACC or ON position, and then turns off automatically.
If there is a malfunction in the SRS, the SRS warning light lights up to inform the driver of the abnormality.
When terminals Tc and E1 of the DLC1 are connected, the DTC is displayed by blinking the SRS warning
light.
WIRING DIAGRAM
DI64R±01

DI08J±09
I08453
Stop Light SwitchCruise Control Actuator

Actuator Motor

Actuator Magnetic Clutch
Cruise Control ECUCruise Control switch

Main Switch

Control Switch
DLC2 Instrument Panel Junction Block No.1

ECU±IG Fuse

STOP Fuse
Park/Neutral Position SwitchVehicle Speed Sensor
± DIAGNOSTICSCRUISE CONTROL SYSTEM
DI±325
PARTS LOCATION

I00281
Cruise Control ECU
C16
G±B
2 1 34W±B
3
STOP Fuse8 Stop Light Switch
4
R±Y
Stop Lights Cruise Control Actuator

Actuator Magnetic Clutch
J6
J6AAJ/C
W±B
1J
1J
W±B
A
J/C
IF 8
7
J9Instrument
Panel J/BL
± DIAGNOSTICSCRUISE CONTROL SYSTEM
DI±331
DTC 12 Actuator Magnetic Clutch Circuit
CIRCUIT DESCRIPTION
This circuit turns on the magnetic clutch inside the actuator during cruise control operation according to the
signal from the ECU. If a malfunction occurs in the actuator or speed sensor, etc. during cruise control opera-
tion, the rotor shaft between the motor and control plate is released.
When the brake pedal is depressed, the stop light switch turns on, supplying electrical power to the stop light.
Power supply to the magnetic clutch is mechanically cut and the magnetic clutch is turned OFF.
When driving downhill, if the vehicle speed exceeds the set speed by 15 km/h (9 mph), the ECU turns the
safety magnet clutch OFF. If the vehicle speed later drops to within 10 km/h (6 mph), cruise control at the
set speed is resumed.
DTC No.DTC Detecting ConditionTrouble Area
12Short in actuator magnetic clutch circuit.
Open (0.8 sec.) in actuator magnetic clutch circuit.
STOP Fuse
Stop light switch
Actuator magnetic clutch
Harness or connector between cruise control ECU and
actuator magnetic clutch, actuator magnetic clutch and body
ground
Cruise control ECU
WIRING DIAGRAM
DI08N±13

I00157
Instrument panel junction block No.1:
STOP Fuse
I00133
21
43
DI±332
± DIAGNOSTICSCRUISE CONTROL SYSTEM
INSPECTION PROCEDURE
1 Check STOP fuse.
PREPARATION:
(a) Turn ignition switch OFF.
(b) Remove the STOP fuse from instrument panel junction
block No.1.
CHECK:
Check fuse continuity.
OK:
There is continuity.
NG Replace STOP fuse.
OK
2 Check stop light switch.
PREPARATION:
Disconnect the stop light switch connector.
CHECK:
Check continuity between terminals.
Switch positionContinuity
Switch pin free
(Brake pedal depressed)1 ± 2
Switch pin pushed in
(Brake pedal released)3 ± 4
NG Replace stop light switch.
OK

I00283
Cruise Control ECU
CMS
CCS
GND
CMS
W±L
W±B
W Cruise Control Switch

Main Switch

Control Switch
1J
78
W±B5
4
3
W±B MAIN
CANCEL
SET/COAST
RES/ACC
A11
10
16 CCS
EP
J6
J6J7 AJ/C
A
A
1J
W±B J/C
IFC16
C16
C16
J9
Instrument Panel J/B DI±340
± DIAGNOSTICSCRUISE CONTROL SYSTEM
DTC 32 Control Switch Circuit (Cruise Control
Switch)
CIRCUIT DESCRIPTION
This circuit carries the SET/COAST, RESUME/ACCEL and CANCEL signals (each voltage) to the ECU.
DTC No.DTC Detecting ConditionTrouble Area
32Short in control switch circuit.
Cruise control switch
Harness or connector between cruise control ECU and
cruise control switch, cruise control switch and body ground
Cruise control ECU
WIRING DIAGRAM
DI08R±13