2003 LEXUS LS430 Identifying compressor condition

Fig. 22: Identifying Air Conditioning Amplifier Connector Front View
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
AIR CONDITIONING AMPLIFIER CONNECTOR SPECIFICATIONS
ItemTest Details / Display (Range)Diagnostic Note
ACTUATOR CHECKActuator check / OFF, ON-
Symbols
(Terminal No.)Wiring
colorTerminal DescriptionConditionSpecification
GND - Body
ground (A11-1 -
Body ground)W-B -
Body
groundGround for main power
supplyAlwaysBelow 1.0
ohms
MPX+ (A11-2)GR-BMultiplex communication
systemMultiplex communication circuit-
ACC - GND
(A11-3 - A11-1)GR - W-
BPower source (ACC)Turn ignition switch to ACC.10 to 14 V
MPX- (A11-4)GR-BMultiplex communication
systemMultiplex communication circuit-
BLW - GND
(A11-5 - A11-1)LG-B -
W-BBlower motor speed
control voltageBlower fan speed OFF --> M2 -->
HIPulse
generation
SOL+ - SOL-
(A11-6 - A11-7)P - Y-BCompressor operation
signalA/C magnetic clutch to ON.Pulse
generation
RDFGR - GND
(A11-8 - A11-1)W - W-BRear defogger operation
voltageIgnition switch ON. Rear
defogger switch to OFF.10 to 14 V
RDFGR - GND
(A11-8 - A11-1)W - W-BRear defogger operation
voltageIgnition switch ON. Rear
defogger switch to ON.Below 1.0 V
IG - GND (A11-9
- A11-1)LG-R -
W-BPower source (IG)Ignition switch ON.10 to 14 V

Fig. 93: Identifying Height Control Compressor Motor Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
3.CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - HEIGHT
CONTROL COMPRESSOR MOTOR) (SEE ELECTRONIC CIRCUIT INSPECTION
PROCEDURE )
a. Connect the height control compressor motor connector.
b. Disconnect the suspension control ECU A21 connector.
c. Measure the resistance according to the value (s) in the table below.
TESTER CONNECTION STANDARD SPECIFIED CONDITION
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
Tester ConnectionSpecified Condition
A21-17 (RM+) - A21-18 (RM-)6.4 to 7.4 ohms

Fig. 94: Identifying Suspension Control ECU Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OK:Go to next step
4.CHECK HARNESS AND CONNECTOR (HEIGHT CONTROL COMPRESSOR MOTOR -
BODY GROUND) (SEE ELECTRONIC CIRCUIT INSPECTION PROCEDURE
)
a. Measure the resistance according to the value (s) in the table below.
TESTER CONNECTION STANDARD SPECIFIED CONDITION
Tester ConnectionSpecified Condition
H11-2 (E) - Body groundBelow 1 ohms

Fig. 95: Identifying Height Control Compressor Motor Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK:Go to next step
5.CHECK HARNESS AND CONNECTOR (HEIGHT CONTROL COMPRESSOR MOTOR - AIR
SUS RELAY) (SEE ELECTRONIC CIRCUIT INSPECTION PROCEDURE
)
a. Disconnect the AIR SUS relay from the fusible link block.
b. Measure the resistance according to the value (s) in the table below.
TESTER CONNECTION STANDARD SPECIFIED CONDITION
Tester ConnectionSpecified Condition
1 (B) - 2 (for AIR SUS relay)Below 1 ohms
1 (B) - Body ground10 Kohms or higher