2003 LEXUS LS430 relay

Fig. 51: Rear Door RH ECU Power Source Circuit -Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.INSPECT FUSE (MPX-IG, AM1, RR DOOR RH, MPX-B1, D/C CUT)
a. Remove the MPX-IG and AM1 fuses from the driver side J/B.
b. Remove the MPX-B1 and RR DOOR RH fuses from the passenger side J/B.
c. Remove the D/C CUT fuse from the FL block assy.
d. Measure the resistance.
Standard: Below 1 ohms
NG: REPLACE FUSE
OK: Go to Next Step.
2.INSPECT RELAY (Marking: D-IG1)
a. Remove the D-IG1 relay from the driver side J/B.
b. Measure the resistance.
Fig. 52: Inspecting Relay (D
-IG1)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

TERMINALS RESISTANCE REFERENCE
NG: REPLACE RELAY
OK: Go to Next Step.
3.CHECK WIRE HARNESS (REAR DOOR RH ECU - BATTERY AND BODY GROUND): Go to
Next Step.
a. Disconnect the R14 ECU connector.
b. Measure the voltage and resistance of the wire harness side connector.
Fig. 53: Checking Wire Harness (Rear Door RH ECU
- Body Ground)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
TERMINALS RESISTANCE AND VOLTAGE REFERENCE
Terminal No.Specified Condition
3 - 510 kohms or higher
3 - 5Below 1 ohms (when battery voltage is applied to terminals 1 and 2)
Tester ConnectionConditionSpecified Condition
R14-6 (GND) - Body groundAlwaysBelow 1 ohms

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

AUTOMATIC TRANSMISSION DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
CIRCUIT, B+ SHORT CIRCUIT IN ABS MOTOR
RELAY CIRCUIT, SHORT CIRCUIT IN ABS
MOTOR FAIL SAFE RELAY CIRCUIT
DTC C0278/11, C0279/12 OPEN/SHORT CIRCUIT IN ABS SOLENOID
RELAY CIRCUIT
DTC C1201/51 ENGINE CONTROL SYSTEM MALFUNCTION
DTC C1203/53 ECM COMMUNICATION CIRCUIT
MALFUNCTION
DTC C1210/36, C1336/39 ZERO POINT CALIBRATION OF YAW
RATE/DECELERATION SENSOR UNDONE
DTC C1223/43 ABS CONTROL SYSTEM MALFUNCTION
DTC C1231/31 MALFUNCTION IN STEERING ANGLE
SENSOR CIRCUIT
DTC C1232/32, C1234/34, C1243/43, C1244/44,
C1245/45, C1381/97
MALFUNCTION IN DECELERATION/YAW
RATE SENSOR, OPEN OR SHORT IN
DECELERATION SENSOR CIRCUIT,
MALFUNCTION IN POWER SUPPLY VOLTAGE
YAW/DECELERATION SENSOR
DTC C1235/35, C1236/36, C1238/38, C1239/39 FOREIGN MATTER IS ATTACHED ON TIP OF
RIGHT/LEFT FRONT/REAR SENSOR
DTC C1241/41 LOW BATTERY POSITIVE VOLTAGE
DTC C1246/46 MALFUNCTION IN MASTER CYLINDER
PRESSURE SENSOR
DTC C1249/49 OPEN CIRCUIT IN STOP LIGHT SWITCH
CIRCUIT
DTC C1251/51 PUMP MOTOR IS LOCKED/OPEN CIRCUIT IN
PUMP MOTOR GROUND
DTC C1267/67 Brake Pedal Load Sensing Switch
DTCDescription
DTC P0705, P0850 TRANSMISSION RANGE SENSOR CIRCUIT
MALFUNCTION (PRNDL INPUT),
PARK/NEUTRAL SWITCH INPUT CIRCUIT
DTC P0710, P0712, P0713 TRANSMISSION FLUID TEMPERATURE
SENSOR "A" CIRCUIT LOW/HIGH INPUT
DTC P0711 TRANSMISSION FLUID TEMPERATURE
SENSOR "A" PERFORMANCE
DTC P0717 TURBINE SPEED SENSOR CIRCUIT NO
SIGNAL
DTC P0724 BRAKE SWITCH "B" CIRCUIT HIGH
DTC P0729 GEAR 6 INCORRECT RATIO

ENGINE IMMOBILIZER DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION (W/SMART
KEY)
ENGINE IMMOBILIZER DIAGNOSTIC TROUBLE CODES (DTC) IDENTIFICATION (W/O
SMART KEY)
C1714, DTC C1714 CIRCUIT
DTC C1715, DTC C1716, DTC C1717, DTC
C1791, DTC C1792, DTC C1793
RIGHT FRONT ACCELERATION SENSOR CIRCUIT
DTC C1725, DTC C1726, DTC C1727, DTC
C1728
RIGHT FRONT ABSORBER CONTROL ACTUATOR
CIRCUIT
DTC C1735 EXHAUST SOLENOID VALVE CIRCUIT
DTC C1737, DTC C1738, DTC C1739, DTC
C1740
RIGHT FRONT HEIGHT CONTROL SOLENOID
VALVE CIRCUIT
DTC C1741 AIR SUS RELAY CIRCUIT
DTC C1742 HEIGHT CONTROL COMPRESSOR CIRCUIT
DTC C1751, DTC C1752 CONTINUOUS ELECTRIC CURRENT TO HEIGHT
CONTROL COMPRESSOR
DTC C1761 ECU MALFUNCTION
DTC C1774 POWER SOURCE CIRCUIT
DTC C1776 SPEED SENSOR CIRCUIT
DTC C1777 STEERING ANGLE SENSOR CIRCUIT
DTC C1786 HEIGHT CONTROL SWITCH CIRCUIT (TEST
DIAGNOSIS)
DTC C1787 ABSORBER CONTROL SWITCH CIRCUIT (TEST
DIAGNOSIS)
DTCDescription
DTC B2780 PUSH SWITCH/KEY UNLOCK WARNING
SWITCH MALFUNCTION
DTC B2793 TRANSPONDER CHIP MALFUNCTION
DTC B2794 UNMATCHED ENCRYPTION CODE
DTC B2795 UNMATCHED KEY CODE
DTC B2797 COMMUNICATION MALFUNCTION NO.1
DTC B2799 ENGINE IMMOBILIZER SYSTEM
MALFUNCTION
DTCDescription
DTC B2780 PUSH SWITCH/KEY UNLOCK WARNING
SWITCH MALFUNCTION
DTC B2793 TRANSPONDER CHIP MALFUNCTION

DTC P0450, DTC P0451, DTC P0452, DTC
P0453
EVAPORATIVE EMISSION CONTROL SYSTEM
PRESSURE SENSOR MALFUNCTION;
EVAPORATIVE EMISSION CONTROL SYSTEM
PRESSURE SENSOR RANGE/PERFORMANCE;
EVAPORATIVE EMISSION CONTROL SYSTEM
PRESSURE SENSOR/SWITCH LOW INPUT;
EVAPORATIVE EMISSION CONTROL SYSTEM
PRESSURE SENSOR/SWITCH HIGH INPUT
DTC P0455, DTC P0456 EVAPORATIVE EMISSION CONTROL SYSTEM
LEAK DETECTED (GROSS LEAK);
EVAPORATIVE EMISSION CONTROL SYSTEM
LEAK DETECTED (VERY SMALL LEAK)
DTC P0500, P0503 VEHICLE SPEED SENSOR "A", VEHICLE
SPEED SENSOR "A"
INTERMITTENT/ERRATIC/HIGH
DTC P0504, P0571 BRAKE SWITCH "A"/"B" CORRELATION,
BRAKE SWITCH "A" CIRCUIT
DTC P0505 IDLE AIR CONTROL SYSTEM
DTC P0560 SYSTEM VOLTAGE
DTC P0604, P0606, P0607, P0657 INTERNAL CONTROL MODULE RANDOM
ACCESS MEMORY (RAM) ERROR, ECM/PCM
PROCESSOR, CONTROL MODULE
PERFORMANCE, ACTUATOR SUPPLY
VOLTAGE CIRCUIT/OPEN
DTC P0617 STARTER RELAY CIRCUIT HIGH
DTC P0630 VIN NOT PROGRAMMED OR MISMATCH -
ECM/PCM
DTC P1340, P1341 CAMSHAFT POSITION SENSOR "A" (BANK 1
SENSOR 2)
DTC P2102, P2103 THROTTLE ACTUATOR CONTROL MOTOR
CIRCUIT LOW/HIGH
DTC P2111, P2112 THROTTLE ACTUATOR CONTROL SYSTEM -
STUCK OPEN/CLOSED
DTC P2118 THROTTLE ACTUATOR CONTROL MOTOR
CURRENT RANGE/PERFORMANCE
DTC P2119 THROTTLE ACTUATOR CONTROL THROTTLE
BODY RANGE/PERFORMANCE
DTC P2120, P2122, P2123, P2125, P2127, P2128,
P2138
THROTTLE/PEDAL POSITION
SENSOR/SWITCH "D" CIRCUIT,
THROTTLE/PEDAL POSITION
SENSOR/SWITCH "D" CIRCUIT LOW/HIGH
INPUT, THROTTLE/PEDAL POSITION
SENSOR/SWITCH "E" CIRCUIT, DTC
THROTTLE/PEDAL POSITION
SENSOR/SWITCH "E" CIRCUIT LOW/HIGH
INPUT, THROTTLE/PEDAL POSITION

HVAC DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
LIGHTING SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
SENSOR/SWITCH "D"/"E" VOLTAGE
CORRELATION
DTC P2121 THROTTLE/PEDAL POSITION
SENSOR/SWITCH "D" CIRCUIT
RANGE/PERFORMANCE
DTC U0001 HIGH SPEED CAN COMMUNICATION
CIRCUIT
DTCDescription
DTC B1411 ROOM TEMPERATURE SENSOR CIRCUIT
DTC B1412 AMBIENT TEMPERATURE SENSOR CIRCUIT
DTC B1413 EVAPORATOR TEMPERATURE SENSOR CIRCUIT
DTC B1415 AIR DUCT SENSOR CIRCUIT (DRIVER SIDE)
DTC B1416 AIR DUCT SENSOR CIRCUIT (PASSENGER SIDE)
DTC B1418 EMISSION GAS SENSOR CIRCUIT
DTC B1421 SOLAR SENSOR CIRCUIT (PASSENGER SIDE)
DTC B1423 PRESSURE SWITCH CIRCUIT
DTC B1424 SOLAR SENSOR CIRCUIT (DRIVER SIDE)
DTC B1428 REAR SOLAR SENSOR CIRCUIT
DTC B1432 AIR INLET DAMPER POSITION SENSOR CIRCUIT
DTC B1434 MAX COOL DAMPER POSITION SENSOR CIRCUIT (DRIVER SIDE)
DTC B1435 MAX COOL DAMPER POSITION SENSOR CIRCUIT (PASSENGER SIDE)
DTC B1442 AIR INLET DAMPER CONTROL SERVOMOTOR CIRCUIT
DTC B1451 COMPRESSOR SOLENOID CIRCUIT
DTC B1461 EMISSION GAS NOX SENSOR CIRCUIT
DTCDescription
DTC B1244 LIGHT SENSOR CIRCUIT MALFUNCTION
DTC B1268 BACK-UP COMMUNICATION BUS MALFUNCTION
DTC B2402, B2403 TRANSISTOR RELAY OVERLOAD/OVERHEAT MALFUNCTION
DTC B2412, B2413 HEADLIGHT SWIVEL MOTOR LH/RH MALFUNCTION
DTC B2414 STEERING POSITION SENSOR MALFUNCTION
DTC B2415 VEHICLE SPEED SENSOR MALFUNCTION
DTC B2416 HEIGHT CONTROL SENSOR MALFUNCTION
DTC B2417, B2418 HEADLIGHT BEAM LEVEL CONTROL MOTOR LH/RH
MALFUNCTION

PRE-COLLISION SAFETY SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
POWER DOOR LOCK CONTROL SYSTEM DIAGNOSTIC TROUBLE CODE (DTC)
IDENTIFICATION
POWER TILT & TELESCOPIC STEERING COLUMN DIAGNOSTIC TROUBLE CODE (DTC)
IDENTIFICATION
DTCDescription
DTC B2000 RIGHT SIDE MOTOR LINE MALFUNCTION HI
DTC B2001 RIGHT SIDE MOTOR LINE MALFUNCTION LO
DTC B2002 RIGHT SIDE MOTOR LINE MALFUNCTION
OPEN
DTC B2005 LEFT SIDE MOTOR LINE MALFUNCTION HI
DTC B2006 LEFT SIDE MOTOR LINE MALFUNCTION LO
DTC B2007 LEFT SIDE MOTOR LINE MALFUNCTION
OPEN
DTC B2015, B2016, B2020, B2021, B2025,
B2026, B2027, B2030, B2031, B2032, B2035,
B2036, B2040, B2041, B2047
RIGHT/LEFT SIDE UPPER/LOWER MOS
MALFUNCTION OPEN, RIGHT SIDE CURRENT
DETECTION CIRCUIT MALFUNCTION HI/LO,
RIGHT/LEFT SIDE OVER-CURRENT
MALFUNCTION, LEFT SIDE CURRENT
DETECTION CIRCUIT MALFUNCTION HI/LO,
POWER SUPPLY RELAY ADHERENCE
MALFUNCTION, POWER SUPPLY RELAY
MALFUNCTION OPEN, EEPROM
MALFUNCTION, FALL OF THE RAISED
VOLTAGE, PRE-COLLISION SAFETY ECU
INNER CIRCUIT MALFUNCTION
DTC B2043 FALL OF THE +B VOLTAGE
DTC B2059 VEHICLE SPEED MALFUNCTION OF
DISTANCE CONTROL ECU
DTC B2064 VEHICLE TYPE SIGNAL MALFUNCTION
DTCDescription
DTC B1222 DOOR LOCK SWITCH CIRCUIT ON DRIVER
DOOR
DTC B1224 DOOR LOCK SWITCH CIRCUIT ON
PASSENGER DOOR
DTCDescription