Mazdamanuals.com

TEMPERATURE FOR HEATED STEERING WHEEL SYSTEM CANNOT BE STABLE [HEATED STEERING WHEEL]

Home  id0603a3802200

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

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 [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) (See AIR BAG SYSTEM SERVICE CAUTIONS [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) •  Switch the ignition off. •  Disconnect the negative battery terminal and wait for 1 min or more. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) •  Inspect the applicable 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 [(E)].)
2*	INSPECT HEATED STEERING WHEEL UNIT THERMISTOR SIGNAL CIRCUIT FOR OPEN CIRCUIT •  Inspect the applicable 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 [(E)].)
Repair completion verification	VERIFY IF MALFUNCTION CAUSE IS CORRECTED •  Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) •  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].)