ALL SWITCH/DIAL OPERATION DOES NOT RESPOND [FULL-AUTO AIR CONDITIONER]
ALL SWITCH/DIAL OPERATION DOES NOT RESPOND [FULL-AUTO AIR CONDITIONER]
SM2335671
id0703c1005400
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Troubleshooting item |
All switch/dial operation does not respond |
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Description
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• All switch/dial operation of climate control unit does not respond
• Indicator light of climate control unit does not turn on
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Possible cause
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• Open circuit in climate control unit power supply circuit
• Short to ground in climate control unit power supply circuit
• Open circuit in climate control unit ground circuit
• Open circuit in dash-electrical supply unit power supply circuit
• Short to ground in dash-electrical supply unit power supply circuit
• Open circuit in dash-electrical supply unit ground circuit
• Ground point floating, bad contact
• Climate control unit malfunction
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• 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, inspect make sure connectors, terminals and wiring harnesses are connected correctly and undamaged.
Diagnostic Procedure
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Step |
Inspection |
Action |
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1 *
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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?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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2 *
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INSPECT CLIMATE CONTROL UNIT GROUND CIRCUIT FOR OPEN CIRCUIT
• Inspect the ground circuit for an open circuit. (See CIRCUIT INSPECTION.)
• Is the circuit normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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3 *
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INSPECT DASH-ELECTRICAL SUPPLY 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?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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4 *
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INSPECT DASH-ELECTRICAL SUPPLY UNIT GROUND CIRCUIT FOR OPEN CIRCUIT
• Inspect the ground circuit for an open circuit. (See CIRCUIT INSPECTION.)
• Is the circuit normal?
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Yes
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Replace the climate control unit, then go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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Repair completion verification
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VERIFY THAT MALFUNCTION SYMPTOM DOES NOT RECUR AFTER REPAIR
• Do the related parts operate according to the switch/dial operation of the climate control unit?
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Yes
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Troubleshooting completed.
Explain repairs to customer.
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No
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Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
If the CAN communication is normal, perform the diagnosis from Step 1.
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