belt LEXUS LS430 2003 Factory User Guide

2.DTC COMBINATION TABLE
a. Perform troubleshooting according to the combination of DTCs output.
"CRUISE CONTROL" is
not displayed on the hand-
held tester via CAN VIM.ECU
COMMUNICATION
STOP MODEvehicles with
dynamic radar/laser
cruise control.ECU
COMMUNICATION
STOP MODE
"PSB" is not displayed on
the hand-held tester via
CAN VIM.SEAT BELT CONTROL
ECU
COMMUNICATION
STOP MODEApplicable only to
vehicles with a Pre-
collision safety
system.SEAT BELT CONTROL
ECU
COMMUNICATION
STOP MODE
"AIR SUSPENSION" is not
displayed on the hand-held
tester via CAN VIM.SUSPENSION
CONTROL ECU
COMMUNICATION
STOP MODEApplicable only to
vehicles with
electronic
modulated air
suspension.SUSPENSION
CONTROL ECU
COMMUNICATION
STOP MODE
"BODY/GATEWAY" is not
displayed on the hand-held
tester via CAN VIM.GATEWAY ECU
COMMUNICATION
STOP MODEApplicable to all
vehiclesGATEWAY ECU
COMMUNICATION
STOP MODE
"BACK GUIDE
MONITOR" is not displayed
on the hand-held tester via
CAN VIM.TELEVISION CAMERA
ECU
COMMUNICATION
STOP MODEApplicable only to
vehicles with a
LEXUS navigation
system.TELEVISION CAMERA
ECU
COMMUNICATION
STOP MODE

x: Not output
-: Undetectable
HINT:
see SKID CONTROL ECU COMMUNICATION STOP MODE .
see STEERING SENSOR COMMUNICATION STOP MODE .
see YAW RATE SENSOR COMMUNICATION STOP MODE .
see GATEWAY ECU COMMUNICATION STOP MODE .
see ECM COMMUNICATION STOP MODE .
see DISTANCE CONTROL ECU COMMUNICATION STOP MODE .
see SUSPENSION CONTROL ECU COMMUNICATION STOP MODE .
see TELEVISION CAMERA ECU COMMUNICATION STOP MODE .
see SEAT BELT CONTROL ECU COMMUNICATION STOP MODE .

Fig. 30: ECUS And Sensors Checking Method Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
1.FAIL-SAFE FUNCTION
a. When communication fails in any of the CAN bus lines (communication lines) due to a short circuit
or other causes, the fail-safe function, which is specified for each system, operates to prevent the
system from malfunctioning.
b. Effects on each system when communication is impossible. (For further details, see the pages for
each system.)
FAIL-SAFE CHART
FunctionECM
Skid
Control
ECUSteering
SensorYaw
Rate
SensorDistance
Control
ECUTelevision
Camera
ECUSuspension
Control
ECUGateway
ECU
Seat
Belt
Control
ECUAction
unab
l
commu
VSC
Control
(Controls
driving force
while VSC
is in
operation)
RxTxRx VSC fun
stop
VSC
Control
(Controls
driving force
while VSC
is in
operation)
RxRx VSC fun
stop

Dynamic
Radar/Laser
Cruise
(Maintains
vehicle-to-
vehicle
distance)
Tx
RxTx Rx Tx Rx
Vehicl
Vehi
dista
n
control
not op
e
Back
Monitor
(Exterior
view from
rear of
vehicle is
displayed
while
reversing)
Tx Rx Back m
onl
Air
Suspension
Control
(Controls
suspension
properly
based on
vehicle
conditions)
TxTx Rx Control
Meter
Display
(Displays
operation
condition
and DTCs)
TxTx RxTx
Lamp
not co
m
or remai
Pre -
collision
Safety (Skid
control ECU
brings BA in
standby
mode and
seat belt is
fastened by
seat belt
control ECU
when
distance
control ECU
determines
that collision
Rx Tx RxPre-col
l
safety sy
does
oper
a

c. SUSPENSION CONTROL ECU
HINT:
DTC communication uses the SIL line.
SUSPENSION CONTROL ECU DIAGNOSTIC TROUBLE CODE CHART
d. TELEVISION CAMERA ECU
HINT:
The television camera ECU is connected to the CAN communication system but CAN
communication system DTCs are not output.
e. GATEWAY ECU
HINT:
The gateway ECU is connected to the CAN communication system but CAN communication
system DTCs are not output.
f. SEAT BELT CONTROL ECU
HINT:
DTC communication uses the SIL line.
SEAT BELT CONTROL ECU DIAGNOSTIC TROUBLE CODE CHART
U0100Lost Communication With ECM/PCM "A"
U0123Lost Communication With Yaw Rate Sensor Module
U0124Lost Communication With Lateral Acceleration Sensor Module
U0126Lost Communication With Steering Angle Sensor Module
DTC No.Detection Item
U0100Lost Communication With ECM/PCM "A"
U0101Lost Communication With TCM
U0122Lost Communication With Vehicle Dynamics Control Module
U0124Lost Communication With Lateral Acceleration Sensor Module
U0126Lost Communication With Steering Angle Sensor Module
U0132Lost Communication With Ride Level Control Module
DTC No.Detection Item
U0100Lost Communication With ECM/PCM "A"
U0122Lost Communication With Vehicle Dynamics Control Module

Fig. 68: Problem Symptom Diagnostic Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
WIRING DIAGRAM
Fig. 69: Wiring Diagram
- Seat Belt Control ECU Communication Stop Mode

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.CHECK CAN BUS LINE FOR DISCONNECTION (SEAT BELT CONTROL ECU SUB BUS
LINE)
Fig. 70: Disconnecting Seat Belt Control ECU Connector (S63)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Turn the ignition switch to the LOCK position.
b. Disconnect the seat belt control ECU connector (S63).
c. Measure the resistance according to the value (s) in the table below.
Standard:
SEAT BELT CONTROL ECU CONNECTOR TERMINALS RESISTANCE
NG: REPAIR OR REPLACE SEAT BELT CONTROL ECU SUB BUS LINE OR CONNECTOR
Tester connectionConditionSpecified value
S63-4 (CANH) - S63-6 (CANL)Ignition Switch OFF54 to 69 ohms

OK: GO TO NEXT STEP
2.CHECK WIRE HARNESS (IG, GND)
Fig. 71: Disconnecting Seat Belt Control ECU Connector (S63)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Disconnect the seat belt control ECU connector (S63).
b. Measure the resistance according to the value (s) in the table below.
c. Measure the voltage according to the value (s) in the table below.
Standard:
SEAT BELT CONTROL ECU CONNECTOR TERMINALS RESISTANCE AND VOLTAGE
NG: REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR
Tester ConnectionConditionSpecified Condition
S63-18 (GND) - Body groundAlwaysBelow 1 ohms
S63-9 (+B) - Body groundAlways10 to 14 V
S63-3 (IG) - Body groundIgnition Switch ON10 to 14 V

OK: REPLACE SEAT BELT CONTROL ECU
CIRCUIT DESCRIPTION
There may be an open circuit in the CAN main bus line and/or the DLC3 sub bus line when the resistance
between terminals 6 (CANH) and 14 (CANL) of the DLC3 is 69 ohms or more.
Fig. 72: Problem Symptom Diagnostic Chart

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

a. Reconnect the television camera ECU sub bus line connector (J52) to the LUG-CAN J/C A side
(w/earth terminal).
45.CHECK CAN BUS LINES FOR SHORT (SEAT BELT CONTROL ECU SUB BUS LINE)
Fig. 122: Identifying DLC3 Connector terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Disconnect the seat belt control ECU connector (S63).
b. Measure the resistance according to the value (s) in the table below.
Standard:
DLC3 CONNECTOR TERMINALS RESISTANCE
NG: REPLACE SEAT BELT CONTROL ECU
Tester connectionConditionSpecified value
D1-6 (CANH) - D1-14 (CANL)Ignition Switch OFF54 to 69 ohms