A/C - Warm Air From Vents A/C ON/DTC B1479 - Automatic

T-SB-0388-09

November 25, 2009

Warm Air from HVAC Vents with A/C ON - DTC B1479 (Automatic Climate Control)

Service Category
Vehicle Interior

Section
Heating/Air Conditioning

Market
USA





Applicability

Introduction

Some RAV4 vehicles with Automatic Air Conditioning Systems 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.

Production Change Information

This TSB applies to the following RAV4 vehicles with Automatic Air Conditioning and 2AR-FE engines:

^ All 2009 TMMC built RAV4.

^ All 2009 Tahara and Shokki built RAV4 vehicles produced BEFORE the Production Change Effective VINs shown.





^ All 2010 TMMC built RAV4 vehicles produced BEFORE the Production Change Effective VINs shown.





Warranty Information

APPLICABLE WARRANTY

^ This repair is covered under the Toyota Comprehensive Warranty. This warranty is in effect for 36 months or 36,000 miles, whichever occurs first, from the vehicle's in-service date.

^ Warranty application is limited to occurrence of the specified condition described in this bulletin.





Parts Information





Required Tools & Equipment





Repair Procedure

1. Using TIS 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 Technical Information System (TIS)





2. Using Techstream inspect the flow sensor.

NOTE

The A/C system will store DTC B1479 when a voltage value between 0.7 and 4.2 V is displayed continuously for more than 8.0 minutes.

^ 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 B66 flow sensor connector.





B. Disconnect the E37 amplifier connector.





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

4. Remove and replace the A/C compressor.





Refer to TIS 2009 model year RAV4 Repair Manual:

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