23-NA-221
Service Bulletin Details
Public Details for: 23-NA-221
This service bulletin provides a procedure for sun load, ambient light, and charge indicator sensor replacement to correct a customer concern of a/c inoperative or a/c blows warm air.
Models from 2023
2023 CADILLAC LYRIQ |
Bulletin No.: Service Bulletin Date: 23-NA-221 January, 2024 TECHNICAL Subject: A/C Inoperative and/or Only Blows Warm Air Due to Faulty Solar Sensor Model Year: Brand: Model: Buick Electra E5 2024 LYRIQ 2023 Cadillac Chevrolet Blazer EV Equinox EV from VIN Breakpoint: to from to 2024 — — Engine: Transmission: — — 2024 Involved Region or Country North America, Europe, China, GM Korea Company, Cadillac Korea (South Korea) Condition Some customers may comment that their A/C system is inoperative and/or only blows warm to hot air. Cause The condition may be caused by an internal circuit fault within the upward-facing light (solar) sensor. This circuit fault provides a high voltage signal consistent with an extremely low cabin air/surface temperature reading and this causes HVAC system to respond by delivering full heat. Correction Replacement of the solar sensor on vehicles with sensors that display voltages in scan tool outside normal operating parameters (>4.5V). Important: This technical service bulletin (TSB) can only be completed by certified repair facilities who have met all specific training, tool and equipment requirements pertaining to the vehicle Brand and Model serviced. Repairs must be performed by a technician who has successfully completed the required training. Important: Service agents must comply with all International, Federal, State, Provincial, and/or Local laws applicable to the activities it performs under this bulletin, including but not limited to handling, deploying, preparing, classifying, packaging, marking, labeling, and shipping dangerous goods. In the event of a conflict between the procedures set forth in this bulletin and the laws that apply to your dealership, you must follow those applicable laws. Copyright 2024 General Motors LLC. All Rights Reserved. Service Procedure Note: Conduct this procedure PRIOR to performing standard A/C diagnostics methods, including checking system pressures. 1. Place the vehicle in Service Mode. 2. Connect the scan tool and navigate to the Passenger Compartment Air Temperature Sensor voltage value, using the following path: Module Diagnostics, [K9] Body Control Module, Data Display, HVAC Sensor Data. 3. Verify Passenger Compartment Air Temperature Sensor voltage reading is <4.5V, and the Left Front Passenger Compartment Air Temperature reading is within +/-10°C (50°F) of current shop temperature. 3.1. If the voltage reading is >4.5V, it is necessary to replace the sensor. 3.2. If the voltage reading is <4.5V, the sensor is operating correctly. Continue with the standard HVAC diagnostics in SI. Note: Refer to table below for a reference of expected voltages for a particular temperature. Page 2 January, 2024 Bulletin No.: 23-NA-221 Solar Sensor Thermistor (REFERENCE) Temperature Solar Sensor Thermistor (REFERENCE) Output (Volts) 95 203 0.21 °C °F Voltage 100 212 0.21 -40 -40 4.68 105 221 0.21 -35 -31 4.57 110 230 0.21 -30 -22 4.42 115 239 0.21 -25 -13 4.24 120 248 0.21 -20 -4 4.02 125 257 0.21 -15 5 3.77 -10 14 3.49 Parts Information -5 23 3.19 0 32 2.88 5 41 2.56 10 50 2.25 15 59 1.96 * We believe this source and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for, or assume any responsibility for the products or material from this firm or for any such items that may be available from other sources. 20 68 1.70 25 77 1.45 30 86 1.24 35 95 1.05 40 104 0.89 45 113 0.76 50 122 0.64 55 131 0.54 60 140 0.46 65 149 70 158 75 167 0.28 80 176 0.24 85 185 0.21 90 194 0.21 Causal Part X Description SENSOR, SUN LOAD & AMB LGT & CHRG IND Part Number Qty 84847757 1 Warranty Information For vehicles repaired under warranty, use: Description Labor Time 0.39 Labor Operation 0.33 4420370 Sun Load, Ambient Light, and Charge Indicator Sensor Replacement Use Published Labor Operation Time Version 2 Modified Released December 15, 2023 Revised January 09, 2024 – Added a Note and Reference Table under Service Procedure. GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information. WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION