Dtc B1451/51 Compressor Solenoid Circuit

Heater & Air Conditioning System. Lexus Is250, Is220D. Gse20 Ale20
Air Conditioning. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK ENGINE TYPE

INSPECT A/C COMPRESSOR

CHECK WIRE HARNESS (A/C COMPRESSOR - BODY GROUND)

CHECK WIRE HARNESS (A/C COMPRESSOR - A/C AMPLIFIER)

INSPECT A/C COMPRESSOR

CHECK WIRE HARNESS (A/C COMPRESSOR - BODY GROUND)

CHECK WIRE HARNESS (A/C COMPRESSOR - A/C AMPLIFIER)

DTC B1451/51 Compressor Solenoid Circuit


DESCRIPTION

In this circuit, the compressor receives a refrigerant compression demand signal from the air conditioning amplifier.
Based on this signal, the compressor changes the amount of compressor output.

DTC No.
DTC Detection Condition
Trouble Area
B1451/51
Open or short in solenoid of the externally changeable compressor circuit
  1. A/C compressor
  2. Harness and connector between A/C amplifier and solenoid of externally changeable compressor
  3. A/C amplifier

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.Air Conditioning.Air Conditioning System. Dtc B1451/51 Compressor Solenoid Circuit


INSPECTION PROCEDURE

1.CHECK ENGINE TYPE

  1. Check the engine type.

    Result:
    Result
    		Proceed to
    4GR-FSE
    (Gasoline engine)
    		A
    2AD-FHV
    (Diesel engine)
    		B


B
Go to step 5
A


2.INSPECT A/C COMPRESSOR


    Lexus Is250, Is220D. Gse20 Ale20.Air Conditioning.Air Conditioning System. Dtc B1451/51 Compressor Solenoid Circuit

  1. Disconnect the A/C compressor connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E8-3 (SOL+) - E8-6 (SOL-)
    		20°C (68°F)
    		10 to 11 Ω


NG
REPLACE A/C COMPRESSOR
OK


3.CHECK WIRE HARNESS (A/C COMPRESSOR - BODY GROUND)


    Lexus Is250, Is220D. Gse20 Ale20.Air Conditioning.Air Conditioning System. Dtc B1451/51 Compressor Solenoid Circuit

  1. Disconnect the A/C compressor connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E8-6 (SOL-) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK WIRE HARNESS (A/C COMPRESSOR - A/C AMPLIFIER)


    Lexus Is250, Is220D. Gse20 Ale20.Air Conditioning.Air Conditioning System. Dtc B1451/51 Compressor Solenoid Circuit

  1. Disconnect the A/C compressor connector.

  1. Disconnect the A/C amplifier connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    J58-5 (SOL+) - E8-3 (SOL+)
    		Always
    		Below 1 Ω
    J58-5 (SOL+) - Body ground
    		Always
    		10 kΩ or higher
    Result:
    Result
    		Proceed to
    NG
    		A
    OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE)
    		B
    OK (When troubleshooting according to the DTC)
    		C


B
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

C
REPLACE AIR CONDITIONING AMPLIFIER
A

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.INSPECT A/C COMPRESSOR


    Lexus Is250, Is220D. Gse20 Ale20.Air Conditioning.Air Conditioning System. Dtc B1451/51 Compressor Solenoid Circuit

  1. Disconnect the A/C compressor connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E63-2 (SOL+) - E63-1 (SOL-)
    		20°C (68°F)
    		10 to 11 Ω


NG
REPLACE A/C COMPRESSOR
OK


6.CHECK WIRE HARNESS (A/C COMPRESSOR - BODY GROUND)


    Lexus Is250, Is220D. Gse20 Ale20.Air Conditioning.Air Conditioning System. Dtc B1451/51 Compressor Solenoid Circuit

  1. Disconnect the A/C compressor connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E63-1 (SOL-) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


7.CHECK WIRE HARNESS (A/C COMPRESSOR - A/C AMPLIFIER)


    Lexus Is250, Is220D. Gse20 Ale20.Air Conditioning.Air Conditioning System. Dtc B1451/51 Compressor Solenoid Circuit

  1. Disconnect the A/C compressor connector.

  1. Disconnect the A/C amplifier connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    J58-5 (SOL+) - E63-2 (SOL+)
    		Always
    		Below 1 Ω
    J58-5 (SOL+) - Body ground
    		Always
    		10 kΩ or higher
    Result:
    Result
    		Proceed to
    NG
    		A
    OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE)
    		B
    OK (When troubleshooting according to the DTC)
    		C


B
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

C
REPLACE AIR CONDITIONING AMPLIFIER
A

REPAIR OR REPLACE HARNESS OR CONNECTOR