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NO.3 TEMPERATURE FOR HEATED STEERING WHEEL SYSTEM CANNOT BE STABLE [HEATED STEERING WHEEL]

NO.3 TEMPERATURE FOR HEATED STEERING WHEEL SYSTEM CANNOT BE STABLE [HEATED STEERING WHEEL]

SM2335531

id0603a3951300

Troubleshooting item

Temperature for heated steering wheel system cannot be stable
Description
• Heated steering wheel temperature is low
• Heated steering wheel temperature continues to rise
Possible Causes
Heated steering wheel control unit cannot control heated steering wheel unit
• Heated steering wheel control unit malfunction
• Heated steering wheel unit malfunction
― Thermostat (built into heated steering wheel unit) malfunction
― Thermistor (built into heated steering wheel 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

Results

Action
1*
INSPECT HEATED STEERING WHEEL UNIT CONTROL CIRCUIT FOR OPEN CIRCUIT
Warning
• Handling the component parts improperly can accidentally operate (deploy) the air bag module, which may seriously injure you. Read the service warnings/cautions and the workshop manual before handling the air bag system components. (See AIR BAG SYSTEM SERVICE WARNINGS [STANDARD DEPLOYMENT CONTROL SYSTEM – MEXICO SPEC.].) (See AIR BAG SYSTEM SERVICE CAUTIONS [STANDARD DEPLOYMENT CONTROL SYSTEM – MEXICO SPEC.].) (See AIR BAG SYSTEM SERVICE WARNINGS [TWO-STEP DEPLOYMENT CONTROL SYSTEM – US/CANADA SPEC.].) (See AIR BAG SYSTEM SERVICE CAUTIONS [TWO-STEP DEPLOYMENT CONTROL SYSTEM – US/CANADA SPEC.].)
• Switch the ignition off.
• Disconnect the negative battery terminal and wait for 1 min or more. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(US)].)
• Inspect the control circuit for an open circuit. (See CIRCUIT INSPECTION.)
• Is the circuit normal?
Yes
Go to the next step.
No
Replace the steering wheel and perform the repair completion verification.
(See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION [(US)].)
2*
INSPECT HEATED STEERING WHEEL UNIT THERMISTOR SIGNAL CIRCUIT FOR OPEN CIRCUIT
• Inspect the control circuit for an open circuit. (See CIRCUIT INSPECTION.)
• Is the circuit normal?
Yes
Replace the heated steering wheel control unit and perform the repair completion verification.
(See HEATED STEERING WHEEL CONTROL UNIT REMOVAL/INSTALLATION.)
No
Replace the steering wheel and perform the repair completion verification.
(See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION [(US)].)
Repair completion verification
VERIFY IF MALFUNCTION CAUSE IS CORRECTED
• Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(US)].)
• Switch the ignition ON (engine off or on).
• Operate the heated steering wheel switch to turn on the heated steering wheel system.
• Does the heated steering wheel system operate normally?
Yes
Troubleshooting completed. (Explain the contents of the servicing to the customer.)
No
Verify the malfunction symptom in the symptom troubleshooting chart and perform the other applicable malfunction diagnosis.
(See SYMPTOM TROUBLESHOOTING [HEATED STEERING WHEEL].)