2003 LEXUS LS430 light

Standard:
TESTER CONNECTION SPECIFIED CONDITION
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE ABS & TRACTION ACTUATOR ASSY (SEE REPLACEMENT
)
CIRCUIT DESCRIPTION
Connecting terminals TC and CG of the DLC3 causes the ECU to display the DTC by blinking the ABS
warning light.
WIRING DIAGRAM
Tester ConnectionSpecified Condition
S42-30 (BZ) - Body ground1 Mohms or higher

Fig. 15: Blinking Pattern Indictor Light
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
2.DTC CHECK USING HAND-HELD TESTER
a. Connect the hand-held tester to the DLC3.
b. Read the DTC following the prompts on the tester screen. Please refer to the hand-held tester
operator's manual for further details.
c. Clear the DTCs.
HINT:
After repairing the malfunctions, clear the DTC.
1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch to the ON position.
3. Erase the DTCs followin
g the prompts on the tester screen.

IG - GND (A11-9
- A11-1)LG-R -
W-BPower source (IG)Ignition switch OFF.0 V
TSDr - GND
(A11-19 - A11-1)L - W-BSolar sensor signal (Driver
side)Ignition switch ON. Solar sensor
subjected to electric light.0.8 to 4.3 V
TSDr - GND
(A11-19 - A11-1)L - W-BSolar sensor signal (Driver
side)Ignition switch ON. Solar sensor
covered by a cloth.Below 0.8 V
TSPa - GND
(A11-20 - A11-1)G-R - W-
BSolar sensor signal
(Passenger side)Ignition switch ON. Solar sensor
subjected to electric light.0.8 to 4.3 V
TSPa - GND
(A11-20 - A11-1)G-R - W-
BSolar sensor signal
(Passenger side)Ignition switch ON. Solar sensor
covered by a cloth.Below 0.8 V
+B - GND (A11-
21 - A11-1)B-Y - W-
BPower source (Back-up)Always10 to 14 V
DGS - SG-1
(A11-29 - A13-8)B - YExhaust gas sensor signal
After 30 seconds from Ignition
switch ON and the sensor is
exposed to the exhaust gas.
1.0 to 4.5 V
DS1 - GND
(A12-1 - A11-1)V - W-BSwing grill STEP motor
signal
Ignition switch ON. Blower
motor: Operating Mode selector:
BI-LEVEL Intelligent swing
register: ON
Pulse
generation
Symbols
(Terminal No.)Wiring
colorTerminal DescriptionConditionSpecification
DS2 - GND
(A12-2 - A11-1)G - W-BSwing grill STEP motor
signal
Ignition switch ON. Blower
motor: Operating Mode selector:
BI-LEVEL Intelligent swing
register: ON
Pulse
generation
PS1 - GND (A12-
3 - A11-1)R-B - W-
BSwing grill STEP motor
signal
Ignition switch ON. Blower
motor: Operating Mode selector:
BI-LEVEL Intelligent swing
register: ON
Pulse
generation
PS2 - GND (A12-
4 - A11-1)B - W-BSwing grill STEP motor
signal
Ignition switch ON. Blower
motor: Operating Mode selector:
BI-LEVEL Intelligent swing
register: ON
Pulse
generation
PS3 - GND (A12-
5 - A11-1)P - W-BSwing grill STEP motor
signal
Ignition switch ON. Blower
motor: Operating Mode selector:
BI-LEVEL Intelligent swing
register: ON
Pulse
generation
PS4 - GND (A12-
6 - A11-1)Y-R - W-
BSwing grill STEP motor
signal
Ignition switch ON. Blower
motor: Operating Mode selector:
BI-LEVEL Intelligent swing
register: ON
Pulse
generation
DUAL - DrGND
(A12-7 - A12-11)O - LG-RDual temperature control
signalIgnition switch ON. Dual switch
ON.Below 1.0 V
DUAL - DrGND
(A12-7 - A12-11)O - LG-RDual temperature control
signalIgnition switch ON. Dual switch
OFF.10 to 14 V

DS3 - GND
(A12-8 - A11-1)B-R - W-
BSwing grill STEP motor
signal
Ignition switch ON. Blower
motor: Operating Mode selector:
BI-LEVEL Intelligent swing
register: ON
Pulse
generation
DS4 - GND
(A12-9 - A11-1)G-B - W-
BSwing grill STEP motor
signal
Ignition switch ON. Blower
motor: Operating Mode selector:
BI-LEVEL Intelligent swing
register: ON
Pulse
generation
DUIND+ -
DUIND - (A12-
10 - A12-13)G-R - B-
WDriver temperature and
passenger temperature
communication signalDriver temperature and passenger
temperature are different.5 to 14 V
DUIND+ -
DUIND- (A12-10
- A12-13)G-R - B-
WDriver temperature and
passenger temperature
communication signalDriver temperature and passenger
temperature are the same.Below 1.0 V
S5-2 - SG-5
(A12-15 - A13-
12)
V-R - LGPressure sensor operation
voltageIgnition switch ON.4.5 to 5.5 V
S5-4 - TSRr(2)
(A12-16 - A11-
30)
GR - W-LRear solar sensor signalIgnition switch ON. Rear solar
sensor subjected to electric light.0.8 to 4.3 V
S5-4 - TSRr(2)
(A12-16 - A11-
30)
GR - W-LRear solar sensor signalIgnition switch ON. Rear solar
sensor covered by a cloth.Below 1.0 V
PRS - SG-5
(A12-17 - A13-
12)
V - LGPressure sensor signalRefrigerant pressure 0 Mpa (0
kgf.cm, 0 psi).0.5V
PRS - SG-5
(A12-17 - A13-
12)
V - LGPressure sensor signalRefrigerant pressure 2.9 Mpa (30
kgf.cm, 427 psi).4.5 V
TAMOUT - GND
(1) (A12-18 -
A11-1)L - W-BVehicle speed signalIgnition switch ON.Pulse
generation
PaDN - PaGND
(A12-19 - A12-
12)R-W - Y-
RTemperature control
switch signal (Passenger
side)Push passenger temperature
switch OFF.10 to 14 V
PaDN - PaGND
(A12-19 - A12-
12)R-W - Y-
RTemperature control
switch signal (Passenger
side)Push passenger temperature
switch ON.Below 1.0 V
PaUP - PaGND
(A12-20 - A12-
12)
W - Y-R
Temperature control
switch signal (Passenger
side)Push passenger temperature
switch OFF.10 to 14 V
Symbols
(Terminal No.)Wiring
colorTerminal DescriptionConditionSpecification
PaUP - PaGND
(A12-20 - A12-W - Y-RTemperature control
switch signal (Passenger
Push passenger temperature Below 1.0 V

HINT:
The followings are the possible items to be customized.
AIR CONDITIONER
AIR CONDITIONER CUSTOMIZE PARAMETERS
SMOK - Body
ground (L14-16
- Body ground)L - Body
groundSmoke sensor
operation signal
Ignition switch ON. Rear A/C switch to
AUTO. By using cigarette smoke. Ignition
switch ON. Rear A/C switch to AUTO. By
not using cigarette smoke.
Above 4.0 V
Below 1.0 V
AUTO - Body
ground (L14-17
- Body ground)W -
Body
groundAuto switch
signal
Ignition switch ON. Rear A/C rear seat
AUTO indicator lights up. Ignition switch
ON. Rear A/C rear seat AUTO indicator
does not light up.
Below 1.0 V 10 to
14 V
RHR - Body
ground (L14-18
- Body ground)V -
Body
groundRear blower
motor operation
signal
Ignition switch ON. Rear A/C manual
mode. Rear A/C blower motor does not
operate. Ignition switch ON. Rear A/C
manual mode. Rear A/C blower motor
speed LO or HI. During actuator check
mode. Display code 0. Display code 2.
10 to 14 V Below
1.0 V 10 to 14 V
Below 1.0 V
RFR - Body
ground (L14-19
- Body ground)Y -
Body
groundRear blower
motor operation
signal
Ignition switch ON. Rear A/C blower
motor speed to except HI. Ignition switch
ON. Rear A/C blower motor speed to HI.
During actuator check mode. Display code
0. Display code 2.
10 to 14 V Below
1.0 V 10 to 14 V
Below 1.0 V
FRS - Body
ground (L14-20
- Body ground)B -
Body
groundExhaust damper
servomotor
operation signal
Ignition switch ON. Front A/C blower
motor operates. Push "FRS" switch.
Ambient temperature below -1 °C Ignition
switch ON. Front A/C blower motor
operates. Push "REC" switch.
10 to 14 V Below
1.0 V
(1)w/ Rear A/C
DISPLAY (ITEM)DEFAULTCONTENTSSETTING

Fig. 34: Diagnostic Trouble Code Information Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
HINT:
*1 If the room temperature is approximately -20°C (-4°F) or lower, DTC B1411/11 may be output even
though the system is normal.
*2 If the ambient temperature is approximately -50°C (-58°F) or lower, a DTC may be output even
though the system is normal.
*3 If the check is being performed in a dark place, DTC B1421/21 (solar sensor circuit abnormal) could
be displayed. In this case, perform DTC check again while shining a light, such as inspection light, on the
solar sensor. If DTC B1421/21 is still displayed, there could be trouble in the solar sensor circuit.
*4 If the check is being performed in a dark place, DTC B1424/24 (solar sensor circuit abnormal) could
be displayed. In this case, perform DTC check again while shining a light, such as inspection light, on the
solar sensor. If DTC B1424/24 is still displayed, there could be trouble in the solar sensor circuit.
*5 If the check is being performed in a dark place, DTC B1421/21 (solar sensor circuit abnormal) could
be displayed. In this case, perform DTC check again while shining a light, such as inspection light, on the
solar sensor. If DTC B1421/21 is still displayed, there could be trouble in the solar sensor circuit.
CIRCUIT DESCRIPTION
This sensor detects the interior temperature that is used as the basis for temperature control and sends
appropriate signals to the A/C amplifier.
Fig. 35: DTC Detection Item Trouble Area Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
WIRING DIAGRAM

Fig. 70: DTC Detection Item Trouble Area Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
HINT:
If DTC B1244 is output at the same time, troubleshoot DTC B1244: LIGHT SENSOR CIRCUIT
MALFUNCTION .
WIRING DIAGRAM
Fig. 71: Solar Sensor Circuit (Passenger Side)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.READ VALUE ON HAND-HELD TESTER
a. Connect the hand-held tester to the DLC3.
b. Turn the ignition switch to the ON position and push the hand-held tester main switch on.

c. Select the item below in the DATA LIST, and read the display on the hand-held tester.
DATA LIST / AIR CONDITIONER:
DATA LIST / AIR CONDITIONER
OK:
The display is as specified in the normal condition.
Result:
AIR CONDITIONER TEST RESULT
B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
C: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT )
A: Go to next step
2.INSPECT AIR CONDITIONING AMPLIFIER (TSPa)
a. Remove the A/C amplifier with connector still connected.
b. Turn the ignition switch to the ON position.
c. Measure the voltage according to the value (s) in the table below.
Standard:
AIR CONDITIONING AMPLIFIER (TSPA) VOLTAGE
HINT:
As the inspection light is moved away from the sensor, the voltage increases.
Use an incandescent lamp for inspection. Bring it within 30 cm (11.8 in.) of the A/C solar sensor.
ItemMeasure Item/Display (Range)Normal ConditionDiagnostic
Note
SOLAR
SENS-PSolar sensor (Passenger side) / min.: 0
max.: 255decreases as brightness
increases-
NGA
OK (Checking from the PROBLEM SYMPTOM TABLE)B
OK (Checking from the DTC)C
Tester connectionConditionSpecified condition
A11-20 (TSPa) - Body groundSensor is subjected to electric light4.0 to 4.6 V
A11-20 (TSPa) - Body groundSensor is covered by a clothBelow 0.8 V