NO.2 STEERING WARMER SYSTEM OPERATES CONSTANTLY [STEERING WARMER]

id0603a3951200

Description	Steering warmer warms steering wheel even though steering warmer switch is off
Possible Causes	Steering warmer switch is always ON •  Steering warmer switch malfunction •  Clock spring malfunction Steering warmer control unit falsely detects steering warmer switch is ON •  Steering warmer control unit malfunction •  Clock spring malfunction •  Short circuit in wiring harness between the following terminal: ―  Steering warmer control unit terminal C and indicator unit terminal I

Diagnostic Procedure

STEP	INSPECTION		ACTION
1	DETERMINE IF THE MALFUNCTION CAUSE IS THE STEERING WARMER SWITCH •  Switch the ignition OFF (LOCK). •  Disconnect the indicator unit connector. (See INDICATOR UNIT REMOVAL/INSTALLATION.) •  Switch the ignition ON (engine off or on). •  Is the steering warmer system operating?	Yes	Go to the next step.
		No	Replace the indicator unit, then go to step 5. (See INDICATOR UNIT REMOVAL/INSTALLATION.)
2*	DETERMINE IF MALFUNCTION CAUSE IS STEERING WARMER CONTROL UNIT 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.) •  Remove the steering wheel. (See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION.) •  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). •  Measure the voltage at clock spring connector 6 terminal 5B. •  Is the voltage B+?	Yes	Go to the next step.
		No	Go to step 4.
3*	DETERMINE IF MALFUNCTION CAUSE IS STEERING WARMER CONTROL UNIT •  Disconnect 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)].) •  Remove the clock spring. (See CLOCK SPRING REMOVAL/INSTALLATION.) •  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). •  Measure the voltage at clock spring connector 3 terminal 4B (vehicle wiring harness side). •  Is the voltage B+?	Yes	•  Refer to the wiring diagram and verify if there is a common connector between the following terminals. ―  clock spring connector 3 terminal 4B and indicator unit terminal I If there is a common connector: •  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to power supply to determine the malfunctioning location. •  Repair or replace the wiring harness which is shorted to the power supply. If there is no common connector: •  Repair or replace the wiring harness which is shorted to the power supply. •  Go to the next step.
		No	Replace the clock spring, then go to the next step. (See CLOCK SPRING REMOVAL/INSTALLATION.)
4*	DETERMINE IF MALFUNCTION CAUSE IS STEERING WARMER CONTROL UNIT •  Reconnect the clock spring connector 3 and 6. •  Disconnect the steering warmer control unit connector. •  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). •  Measure the voltage at steering warmer control unit terminal C (vehicle wiring harness side). •  Is the voltage B+?	Yes	•  Repair or replace the wiring harness which is shorted to the power supply. •  Go to the next step.
		No	Replace the steering warmer control unit, then go to the next step. (See STEERING WARMER CONTROL UNIT REMOVAL/INSTALLATION.)
5	VERIFY IF MALFUNCTION CAUSE IS CORRECTED •  Reconnect all the disconnected connectors. •  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].)