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Air conditioning stopped cooling / no response to AC button

Q: How to fix Air conditioning stopped cooling / no response to AC button in Lexus IS350?

Precise verification of the continuity of the electrical harness and contacts in the medium pressure sensor plug. Often the cause of errors is oxidation of pins or abrasion of LIN/CAN wires near the sensor, and not the sensor itself. If necessary, solder damaged cables or replace the connection block.

in Lexus IS350 (2006-2021)

Symptoms

Air conditioning stopped cooling / no response to AC button

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Technical diagnosis (Premium)

Recognized technical fault:

Auxiliary controller voltage instability detected

Technical analysis

Detailed analysis of HVAC controller operation parameters, CAN bus data readings, and diagnostic signal waveforms. Purchase PRO access or log in to read the full fault analysis.

Confirmed solution

Complete step-by-step repair procedure including module non-volatile memory reset, sensor calibration, and correct wiring routing. Unlock the full report to see the instruction.

Parts needed

Filters ferrite anti-interference / noise suppressor
Auxiliary starting battery (depending on cell status)

Workshop hacks

Important workshop tips for mechanics regarding bypasses without expensive control module replacement and manufacturer software service bulletins.

TSB / TPI service bulletins

TSB-24-HVAC-01TPI-2068943/2

A/C Technical Specifications

d/5,0 F

Refrigerant: R134a Amount (g): 440g Oil: ND8 PAO 68 lub PAG ISO 46 b.d. LS Oil (ml): 40ml

300

Refrigerant: R134a Amount (g): 550 – 650g Oil: ND8 PAO 68 lub PAG ISO 46 b.d. IS Oil (ml): 250ml

200

Refrigerant: R134a Amount (g): 550 – 650g Oil: ND8 PAO 68 lub PAG ISO 46 Oil (ml): 150ml

See full specification

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