2010 Lexus Truck RX 350 AWD V6-3.5L (2GR-FE) DIAGNOSIS AND REPAIR,MAINTENANCE, Technical Service Bulletin # CAN-TSB2757L Date: 091216

Canada - A/C - Warm Air From Vents With A/C On

Bulletin

TSB2757

Issue Date

December 16, 2009

Title

WARM AIR FROM HVAC VENTS WITH A/C ON - DTC B1479

Component

HEATING/ AIR CONDITIONING

Models

'10 RX350

INTRODUCTION:

Some RX 350 vehicles may exhibit a condition where the HVAC system intermittently blows warm air from the vents with the A/C on.

Diagnostic Trouble Code (DTC) B1479 (Flow Sensor Circuit) may be stored in the A/C system as either a Current or History DTC. A

malfunctioning A/C compressor flow sensor may cause this condition.

Follow the procedure in this TSB to determine if this service bulletin is applicable and to repair the vehicle.

APPLICABILITY:

PRODUCTION CHANGE INFORMATION:

2010 Lexus Truck RX 350 AWD V6-3.5L (2GR-FE) Page 96

This TSB applies to vehicles produced BEFORE the Production Change Effective VIN shown below.

WARRANTY INFORMATION:

PARTS INFORMATION:

2010 Lexus Truck RX 350 AWD V6-3.5L (2GR-FE) Page 97

REQUIRED TOOLS & EQUIPMENT:

REPAIR PROCEDURE:

1. Using ETAS Techstream, check for diagnostic trouble codes (DTCs) in the A/C system.

- If DTC B1479 is stored as a Current or History DTC, go to step 2.

- If DTC B1479 is NOT stored as Current or History, this TSB does NOT apply. Refer to the problem symptoms table of the Repair Manual.

Refer to the Repair Manual within E-TAS / TIS library:

- Division: Lexus

- Model: RX350

- Year: 2010

- Service Category: Vehicle Interior

- Section: Heating/Air Conditioning

- Keyword: Air Conditioning System/ Problem Symptoms Table

2010 Lexus Truck RX 350 AWD V6-3.5L (2GR-FE) Page 98

2. Using Techstream, inspect the the flow sensor.

- If the flow sensor value does NOT change when switching the A/C system/blower ON and OFF, and is stuck between 0.7 and 4.0 V, go to

step 4.

- If the flow sensor voltage is normal, go to step 3 (wire harness check).

3. Check the harness and connector (A/C compressor flow sensor - A/C amplifier).

A. Disconnect the A/C amplifier connector.

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

2010 Lexus Truck RX 350 AWD V6-3.5L (2GR-FE) Page 99

Standard Resistance:

- If any of the harness resistance tests fail, this TSB does NOT apply.

Repair or replace the harness and go to step 5.

- If all tests are within specifications, proceed to step 4.

4. Remove and replace the A/C compressor.

Refer to the Repair Manual within E-TAS / TIS library:

- Division: Lexus

- Model: RX350

- Year: 2010

- Service Category: Vehicle Interior

- Section: Heating/Air Conditioning

- Keyword: Heating/Air Conditioning: Compressor: Removal/Installation

5. Clear all DTCs and confirm the A/C system has returned to proper operation.

NOTE:

Issue of this Technical Service Bulletin is to ensure that proper repair information is available. IT DOES NOT CONSTITUTE AN

AUTHORIZATION FOR REPAIR. Normal provisions of the formal warranty policy, as applicable, will apply.