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

id0603a3951300

Description	•  Steering warmer temperature is low •  Steering warmer temperature continues to rise
Possible Causes	Steering warmer control unit cannot control steering warmer unit •  Steering warmer control unit malfunction •  Thermostat (built into steering warmer unit) malfunction •  Thermistor (built into steering warmer unit) malfunction

Diagnostic Procedure

STEP	INSPECTION		ACTION
1*	VERIFY IF MALFUNCTION CAUSE IS OPEN CIRCUIT IN WIRING HARNESS OF STEERING WARMER UNIT 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.) (See AIR BAG SYSTEM SERVICE CAUTIONS.) •  Switch the ignition to off (LOCK). •  Disconnect the negative battery terminal and wait for 1 min or more. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].)(See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].)(See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) •  Remove the driver-side air bag module connector. (See DRIVER-SIDE AIR BAG MODULE REMOVAL.) (See DRIVER-SIDE AIR BAG MODULE INSTALLATION.) •  Disconnect the steering warmer unit connector. •  Inspect for continuity between the following terminals (wiring harness-side): ―  Steering warmer unit terminal A—B ―  Steering warmer unit terminal C—D •  Is there continuity?	Yes	Replace the steering warmer control unit, then go to the next step. (See STEERING WARMER CONTROL UNIT REMOVAL/INSTALLATION.)
		No	Replace the steering wheel, then go to the next step. (See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION.)
2	VERIFY IF MALFUNCTION CAUSE IS CORRECTED •  Connect the negative battery terminal. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].)(See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].)(See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) •  Switch the ignition ON (engine off or on). •  Operate the steering warmer switch to turn on the steering warmer system. •  Does the steering warmer 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 [STEERING WARMER].)