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Going through another site I found a TSB that might cover this issue.... (AC004-06) Lexus Supports ASE Certification Page 1 of 2 Title: A/C LIGHT BLINKING Models: ’07 RX 350 Technical Service Information Bulletin October 13, 2006 AC004-06 Some customers may experience the A/C light blinking and/or a “Check A/C System” error message on the multi-display. Production changes to the A/C amplifier have been made to remedy this concern. 􀀀 2007 model year RX 350 vehicles produced BEFORE the Production Change Effective VINs shown below. MODEL PLANT DRIVETRAIN PRODUCTION CHANGE EFFECTIVE VIN TMK 2WD JTJGK31U#70004858 RX 350 4WD JTJHK31U#72013500 TMMC 2WD 2T2GK31U#7C011001 4WD 2T2HK31U#7C018238 PREVIOUS PART NUMBER CURRENT PART NUMBER PART NAME QTY 88650–0E020 88650–0E021 Amplifier Assembly, Air Conditioner 1 OP CODE DESCRIPTION TIME OFP T1 T2 AC0007 R & R A/C Amplifier 0.4 88650–0E020 99 99 Applicable Warranty*: This repair is covered under the Lexus Comprehensive Warranty. This warranty is in effect for 48 months or 50,000 miles, whichever occurs first, from the vehicle’s in-service date. * Warranty application is limited to correction of a problem based upon a customer’s specific complaint. HEATING & AIR CONDITIONING Introduction Applicable Vehicles Production Change Information Parts Information Warranty Information A/C LIGHT BLINKING – AC004-06 October 13, 2006 Page 2 of 2 1. Disconnect the negative (–) battery terminal. 2. Remove the RH front door scuff plate. 3. Remove the RH cowl side trim sub-assembly. 4. Remove the instrument panel under cover sub-assembly. 5. Remove the glove compartment door assembly. 6. Remove the ECM. 7. Remove the air conditioner amplifier assembly. A. Disconnect the connectors, including the suspension control ECU connectors. B. Remove the 2 nuts retaining the air conditioner amplifier assembly/suspension control ECU bracket. 8. Remove the suspension control ECU from the bracket (w/ air suspension). 9. Reassemble in reverse order of disassembly. 10. Perform all necessary re-initialization procedures. Refer to the following TSIBs: 􀀀 TSIB No. PD006-06, “Initialization of Power Back Door During PDS” 􀀀 TSIB No. PD007-06, “Initialization of Sliding Roof During PDS” 􀀀 TSIB No. PD008-06, “Initialization of Power Window During PDS” Repair Procedure A/C Amplifier