Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Compressor Solenoid Circuit (B1451/51)
DESCRIPTION
In this circuit, the cooler compressor assembly (compressor solenoid) receives a refrigerant compression demand signal from the air conditioning amplifier assembly.
Based on this signal, the cooler compressor assembly (compressor solenoid) changes the amount of compressor output.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Memory |
|---|---|---|---|---|
| B1451/51 | Compressor Solenoid Circuit | Open or short in compressor solenoid circuit |
| - |
WIRING DIAGRAM
PROCEDURE
| 1. | INSPECT COOLER COMPRESSOR ASSEMBLY (COMPRESSOR SOLENOID) |
| (a) Disconnect the D17 cooler compressor assembly (compressor solenoid) connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| 1 (SOL-) - 2 (SOL+) | 25°C (77°F) | 10.1 to 11.1 Ω |
| NG | .gif) | REPLACE COOLER COMPRESSOR ASSEMBLY (COMPRESSOR SOLENOID) |
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|
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| 2. | CHECK HARNESS AND CONNECTOR (COOLER COMPRESSOR ASSEMBLY (COMPRESSOR SOLENOID) - BODY GROUND) |
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| D17-1 (SOL-) - Body ground | Always | Below 1 Ω |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 3. | CHECK HARNESS AND CONNECTOR (COOLER COMPRESSOR ASSEMBLY (COMPRESSOR SOLENOID) - AIR CONDITIONING AMPLIFIER ASSEMBLY) |
(a) Disconnect the J43 air conditioning amplifier assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| D17-2 (SOL+) - J43-3 (SOL+) | Always | Below 1 Ω |
| D17-2 (SOL+) or J43-3 (SOL+) - Body ground | Always | 10 kΩ or higher |
| Result | Proceed to |
|---|---|
| NG | A |
| OK (When troubleshooting according to the Problem Symptoms Table) | B |
| OK (When troubleshooting according to the DTC) | C |
| A | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| B | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| C | | REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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