Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Check Mode Procedure
CHECK MODE PROCEDURE
REFRIGERANT SHORTAGE CHECK IN NORMAL OPERATION (CHECK A/C SWITCH INDICATOR AND DTC)
(a) Start the engine.
(b) Check that the A/C switch indicator remains on when the following conditions are met.
| *a | A/C Switch (Multi-display) |
| Item | Condition |
|---|---|
| A/C switch | On |
| A/C operation time | 15 minutes or more |
| Ambient temperature* | 0 to 49°C (32 to 120°F) |
| Engine coolant temperature | 45°C (113°F) or more |
*: If the ambient temperature is not within the range shown, do not perform this check.
HINT:
The A/C switch indicator and air conditioning system turn off if the amount of refrigerant in the system is insufficient.
(c) Connect the Techstream to the DLC3.
(d) Check for DTC B14B8.
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| Result | Amount of Refrigerant | Corrective Action |
|---|---|---|
| DTC B14B8 is output | Empty or nearly empty | Check for refrigerant leaks using a halogen leak detector, and repair if necessary. Click here |
| DTC B14B8 is not output | Correct or insufficient | Perform a refrigerant shortage check using the Techstream. |
REFRIGERANT SHORTAGE CHECK USING TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Start the engine.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Utility / Refrigerant Gas Volume Check.
Body Electrical > Air Conditioner > Utility| Tester Display |
|---|
| Refrigerant Gas Volume Check |
(e) According to the display on the Techstream, perform the refrigerant shortage check when the following conditions are met.
Measurement Condition:| Item | Condition |
|---|---|
| A/C switch | On |
| Ambient temperature* | 0 to 49°C (32 to 120°F) |
| Blower speed | HI |
*: If the ambient temperature is not within the range shown, do not perform this check.
HINT:
- Refer to the Techstream operator's manual for further details.
- A message indicating a refrigerant shortage is displayed on the Techstream and the air conditioning system turns off if the amount of refrigerant in the system is insufficient.
- DTCs are not stored when performing the refrigerant shortage check using the Techstream.
| Result | Amount of Refrigerant | Corrective Action |
|---|---|---|
| Refrigerant shortage | Insufficient or leakage |
|
| Refrigerant correct | Correct | - |
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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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