2003 LEXUS LS430 airbag

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE AIRBAG SENSOR ASSY CENTER (SEE HOW TO PROCEED WITH
TROUBLESHOOTING )
WIRING DIAGRAM
Fig. 70: Passenger'S Seat Belt Warning Lamp Wiring Diagram

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
HINT:
Displa
y except for the seat belt warning indicator are shown in the navigation system (see HOW TO

PROCEED WITH TROUBLESHOOTING) and A/C system (see HOW TO PROCEED WITH
TROUBLESHOOTING ).
1.PERFORM ACTIVE TEST BY HAND-HELD TESTER
a. Operate the hand-held tester according to the steps on the display and select the "ACTIVE TEST".
Standard
ACTIVE TEST REFERENCE
OK:
Indicator lamp (ON/OFF) can be switched by ACTIVE TEST.
NG: REPLACE COMBINATION METER ASSY (SEE OVERHAUL
)
OK: GO TO NEXT STEP
2.READ VALUE OF HAND-HELD TESTER (FRONT PASSENGER SEAT BELT)
a. Operate the hand-held tester according to the steps on the display and select the "DATA LIST".
SRS AIRBAG:
DATA LIST ITEM REFERENCE
OK:
Switch condition (ON/OFF) can be switched by actual operation.
RESULT:
RESULT REFERENCE
B: Go to step 6
ItemTest DetailsDiagnostic Note
P-BELT
REMINDIndicat. Lamp P-SEAT BELT
(OFF/ON)Confirm that the vehicle is stopped and engine
idling
ItemMeasurement Item/ Range
(Display)Normal ConditionDiagnostic
Note
P SEAT
BUCKLPassenger seat belt buckle switch
is ON /OFFON: Seat belt is fastened OFF: Seat
belt is unfastened-
NGA
OK (w/o LEXUS Navigation)B
K (w/ LEXUS Navigation)C

4.CHECK HARNESS AND CONNECTOR (FRONT SEAT INNER BELT ASSY - BODY
GROUND) (SEE HOW TO PROCEED WITH TROUBLESHOOTING
)
a. Disconnect the connector from the front seat inner belt assy (FR Passenger Side).
b. Measure the resistance according to the value (s) in the table below.
Standard
RESISTANCE SPECIFICATIONS
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
Fig. 72: Identifying Front Seat Inner Belt Assy (Passenger Side) Connector Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OK: GO TO NEXT STEP
5.CHECK HARNESS AND CONNECTOR (FRONT SEAT INNER BELT ASSY - AIRBAG
SENSOR ASSY CENTER) (SEE HOW TO PROCEED WITH TROUBLESHOOTING
)
Tester ConnectionConditionSpecified Condition
B5-5 - Body groundAlwaysBelow 1 ohms

Fig. 73: Identifying B5 And A25 Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE AIRBAG SENSOR ASSY CENTER (SEE HOW TO PROCEED WITH
TROUBLESHOOTING )
6.INSPECT COMBINATION METER ASSY
a. Disconnect the clock assy connector.
b. Measure the voltage according to the value (s) in the table below.
Standard
VOLTAGE SPECIFICATIONS
NG: Go to step 8
Fig. 74: Identifying C12 Connector Terminals
Terminal NoConditionSpecified condition
C12-9 - Body groundIgnition switch ON, Passenger seat belt is unfastened10 to 14 V

AIR BAG RESTRAINT DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
DTCDescription
DTC B1000/31 AIRBAG SENSOR ASSY CENTER
MALFUNCTION
DTC B1610/13 FRONT AIRBAG SENSOR (RH)
MALFUNCTION
DTC B1615/14 FRONT AIRBAG SENSOR (LH)
MALFUNCTION
DTC B1620/21 SIDE AIRBAG SENSOR ASSY (RH)
MALFUNCTION
DTC B1625/22 SIDE AIRBAG SENSOR ASSY (LH)
MALFUNCTION
DTC B1630/23 AIRBAG SENSOR REAR (RH) MALFUNCTION
DTC B1635/24 AIRBAG SENSOR REAR (LH) MALFUNCTION
DTC B1650/32 OCCUPANT DETECTION SENSOR CIRCUIT
MALFUNCTION
DTC B1653/35 SEAT POSITION AIRBAG SENSOR CIRCUIT
MALFUNCTION
DTC B1655/37 SEAT BELT BUCKLE SWITCH (RH)
MALFUNCTION
DTC B1656/38 SEAT BELT BUCKLE SWITCH (LH)
MALFUNCTION
DTC B1800/51 SHORT IN D SQUIB CIRCUIT
DTC B1801/51 OPEN IN D SQUIB CIRCUIT
DTC B1802/51 SHORT IN D SQUIB CIRCUIT (TO GROUND)
DTC B1803/51 SHORT IN D SQUIB CIRCUIT (TO B+)
DTC B1805/52 SHORT IN P SQUIB CIRCUIT
DTC B1806/52 OPEN IN P SQUIB CIRCUIT
DTC B1807/52 SHORT IN P SQUIB CIRCUIT (TO GROUND)
DTC B1808/52 SHORT IN P SQUIB CIRCUIT (TO B+)
DTC B1810/53 SHORT IN D SQUIB (DUAL STAGE - 2ND
STEP) CIRCUIT
DTC B1811/53 OPEN IN D SQUIB (DUAL STAGE - 2ND STEP)
CIRCUIT

DTC B1812/53 SHORT IN D SQUIB (DUAL STAGE - 2ND
STEP) CIRCUIT (TO GROUND)
DTC B1813/53 SHORT IN D SQUIB (DUAL STAGE - 2ND
STEP) CIRCUIT (TO B+)
DTC B1815/54 SHORT IN P SQUIB (DUAL STAGE - 2ND STEP)
CIRCUIT
DTC B1816/54 OPEN IN P SQUIB (DUAL STAGE - 2ND STEP)
CIRCUIT
DTC B1817/54 SHORT IN P SQUIB (DUAL STAGE - 2ND STEP)
CIRCUIT (TO GROUND)
DTC B1818/54 SHORT IN P SQUIB (DUAL STAGE - 2ND STEP)
CIRCUIT (TO B+)
DTC B1820/55 SHORT IN SIDE SQUIB (RH) CIRCUIT
DTC B1821/55 OPEN IN SIDE SQUIB (RH) CIRCUIT
DTC B1822/55 SHORT IN SIDE SQUIB (RH) CIRCUIT (TO
GROUND)
DTC B1823/55 SHORT IN SIDE SQUIB (RH) CIRCUIT (TO B+)
DTC B1825/56 SHORT IN SIDE SQUIB (LH) CIRCUIT
DTC B1826/56 OPEN IN SIDE SQUIB (LH) CIRCUIT
DTC B1827/56 SHORT IN SIDE SQUIB (LH) CIRCUIT (TO
GROUND)
DTC B1828/56 SHORT IN SIDE SQUIB (LH) CIRCUIT (TO B+)
DTC B1830/57 SHORT IN CURTAIN SHIELD SQUIB (RH)
CIRCUIT
DTC B1831/57 OPEN IN CURTAIN SHIELD SQUIB (RH)
CIRCUIT
DTC B1832/57 SHORT IN CURTAIN SHIELD SQUIB (RH)
CIRCUIT (TO GROUND)
DTC B1833/57 SHORT IN CURTAIN SHIELD SQUIB (RH)
CIRCUIT (TO B+)
DTC B1835/58 SHORT IN CURTAIN SHIELD SQUIB (LH)
CIRCUIT
DTC B1836/58 OPEN IN CURTAIN SHIELD SQUIB (LH)
CIRCUIT
DTC B1837/58 SHORT IN CURTAIN SHIELD SQUIB (LH)
CIRCUIT (TO GROUND)
DTC B1838/58 SHORT IN CURTAIN SHIELD SQUIB (LH)
CIRCUIT (TO B+)
DTC B1860/64 SHORT IN KNEE AIRBAG (D SIDE) SQUIB
CIRCUIT
DTC B1861/64 OPEN IN KNEE AIRBAG (D SIDE) SQUIB
CIRCUIT
DTC B1862/64 SHORT IN KNEE AIRBAG (D SIDE) SQUIB
CIRCUIT (TO GROUND)

ANTI-LOCK BRAKE DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
DTC B1863/64 SHORT IN KNEE AIRBAG (D SIDE) SQUIB
CIRCUIT (TO B+)
DTC B1865/65 SHORT IN KNEE AIRBAG (P SIDE) SQUIB
CIRCUIT
DTC B1866/65 OPEN IN KNEE AIRBAG (P SIDE) SQUIB
CIRCUIT
DTC B1867/65 SHORT IN KNEE AIRBAG (P SIDE) SQUIB
CIRCUIT (TO GROUND)
DTC B1868/65 SHORT IN KNEE AIRBAG (P SIDE) SQUIB
CIRCUIT (TO B+)
DTC B1901/73 OPEN IN FRONT P/T SQUIB (RH) CIRCUIT
DTC B1902/73 SHORT IN FRONT P/T SQUIB (RH) CIRCUIT
(TO GROUND)
DTC B1903/73 SHORT IN FRONT P/T SQUIB (RH) CIRCUIT
(TO B+)
DTC B1905/74 SHORT IN FRONT P/T SQUIB (LH) CIRCUIT
DTC B1906/74 OPEN IN FRONT P/T SQUIB (LH) CIRCUIT
DTC B1907/74 SHORT IN FRONT P/T SQUIB (LH) CIRCUIT
(TO GROUND)
DTC B1908/74 SHORT IN FRONT P/T SQUIB (LH) CIRCUIT
(TO B+)
DTC B1920/77 SHORT IN REAR P/T SQUIB (RH) CIRCUIT
DTC B1921/77 OPEN IN REAR R/T SQUIB (RH) CIRCUIT
DTC B1922/77 SHORT IN REAR R/T SQUIB (RH) CIRCUIT (TO
GROUND)
DTC B1923/77 SHORT IN REAR P/T SQUIB (RH) CIRCUIT (TO
B+)
DTC B1925/78 SHORT IN REAR P/T SQUIB (LH) CIRCUIT
DTC B1926/78 OPEN IN REAR P/T SQUIB (LH) CIRCUIT
DTC B1927/78 SHORT IN REAR P/T SQUIB (LH) SIRCUIT (TO
GROUND)
DTC B1928/78 SHORT IN REAR P/T SQUIB (LH) CIRCUIT (TO
B+)
DTCDescription
DTC C0200/31, C0205/32 RIGHT/LEFT FRONT SPEED SENSOR
DTC C0210/33, C0215/34 RIGHT/LEFT REAR SPEED SENSOR
DTC C0226/21, C0236/22, C0246/23, C0256/24,
C1225/25
SFR/SFL/SRR/SRL/SM SOLENOID CIRCUIT
DTC C0273/13, C0274/14, C1361/91 OPEN CIRCUIT IN ABS MOTOR RELAY

MULTIPLEX COMMUNICATION SYSTEM DIAGNOSTIC TROUBLE CODE (DTC)
IDENTIFICATION
DTC B2419 BEAN COMMUNICATION MALFUNCTION
DTC B2420 AFS ECU MALFUNCTION
DTCDescription
DTC B1205 AFS ECU COMMUNICATION STOP
DTC B1211 DRIVER DOOR ECU COMMUNICATION STOP
DTC B1212 FRONT PASSENGER DOOR ECU COMMUNICATION STOP
DTC B1213 TILT AND TELESCOPIC ECU COMMUNICATION STOP
DTC B1214, B1215 DOOR SYSTEM COMMUNICATION BUS MALFUNCTION (+B SHORT)/
(GND SHORT)
DTC B1216 REAR RIGHT DOOR ECU COMMUNICATION STOP
DTC B1217 REAR LEFT DOOR ECU COMMUNICATION STOP
DTC B1219 REAR SEAT SWITCH COMMUNICATION STOP
DTC B1248 AVC-LAN COMMUNICATION IMPOSSIBLE
DTC B1262 A/C ECU COMMUNICATION STOP
DTC B1263 LUGGAGE ROOM JUNCTION BLOCK ECU COMMUNICATION STOP
DTC B1266, B1267 INSTRUMENT PANEL SYSTEM COMMUNICATION BUS MALFUNCTION
(+B SHORT)/(GND SHORT)
DTC B1269 THEFT DETERRENT ECU COMMUNICATION STOP
DTC B1271 COMBINATION METER ECU COMMUNICATION STOP
DTC B1272 POWER SEAT ECU COMMUNICATION STOP
DTC B1273 SLIDING ROOF ECU COMMUNICATION STOP
DTC B1275 ACCESSORY BUS BUFFER COMMUNICATION STOP
DTC B1277 CENTER INTEGRATION ECU COMMUNICATION STOP
DTC B1278 COMBINATION SWITCH ECU COMMUNICATION STOP
DTC B1279 RAIN SENSOR COMMUNICATION STOP
DTC B1281 AIRBAG ECU COMMUNICATION STOP
DTC B1283 DRIVER SIDE JUNCTION BLOCK ECU COMMUNICATION STOP
DTC B1284 PASSENGER SIDE JUNCTION BLOCK ECU COMMUNICATION STOP
DTC B1285 STEERING PAD SWITCH COMMUNICATION STOP
DTC B1291, B1292 LIGHT SYSTEM COMMUNICATION BUS MALFUNCTION (+B SHORT)/
(GND SHORT)
DTC B1294 IMMOBILIZER ECU COMMUNICATION STOP
DTC B1296 FRONT LIGHT ECU COMMUNICATION STOP
DTC B1297 CLEARANCE SONAR ECU COMMUNICATION STOP
DTC B1298 REAR RIGHT SEAT ECU COMMUNICATION STOP
DTC B1299 REAR LEFT SEAT ECU COMMUNICATION STOP