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CLIMATE CONTROL UNIT DOES NOT STORE INFORMATION [FULL-AUTO AIR CONDITIONER]

id0703c1005900

Troubleshooting item

Climate control unit does not store information

Description

•  When ignition is switched ON (engine off or on), climate control unit activated with set temperature at 22 °C {72 °F} while in AUTO

•  Past malfunction code is not stored in climate control unit

Possible cause

•  Climate control unit malfunction

Troubleshooting item	Climate control unit does not store information
Description	• When ignition is switched ON (engine off or on), climate control unit activated with set temperature at 22 °C {72 °F} while in AUTO • Past malfunction code is not stored in climate control unit
Possible cause	• Climate control unit malfunction

• When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while performing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If there is a problem, check to make sure connectors, terminals and wiring harnesses are connected correctly and undamaged.

Diagnostic Procedure

Step	Inspection		Action
1*	INSPECT CLIMATE CONTROL UNIT POWER SUPPLY CIRCUIT FOR SHORT TO GROUND AND OPEN CIRCUIT • Inspect the power supply circuit for an open circuit and short to ground. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Replace the climate control unit, then go to the next step. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER (E)])
1*		No	Repair or replace the malfunctioning location and perform the repair completion verification.
Repair completion verification	VERIFY THAT MALFUNCTION SYMPTOM DOES NOT RECUR AFTER REPAIR • Does the climate control unit store information normally?	Yes	Troubleshooting completed. Explain repairs to customer.
Repair completion verification		No	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].) If the CAN communication is normal, perform the diagnosis from Step 1.