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HEATED STEERING WHEEL SYSTEM DOES NOT OPERATE [HEATED STEERING WHEEL]

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Troubleshooting item		Heated steering wheel system does not operate
Description		Heated steering wheel does not warm steering wheel even though heated steering wheel switch is on
Possible causes		The power supply is not supplied to filament of heated steering wheel •  Open circuit in heated steering wheel control unit power supply circuit •  Open circuit in clock spring power supply circuit •  IG1 relay No.2 malfunction •  Clock spring malfunction Heated steering wheel control unit not operation •  Open circuit in heated steering wheel control unit ground circuit •  Open circuit in clock spring ground circuit •  Clock spring malfunction Heated steering wheel unit cannot control filament on •  Heated steering wheel unit malfunction Heated steering wheel filament does not generate heat •  Heated steering wheel unit malfunction Heated steering wheel control unit cannot receive operation signal •  Open circuit in heated steering wheel control unit control circuit •  Short to ground in heated steering wheel control unit control circuit •  Short to power supply in heated steering wheel control unit control circuit •  Open circuit in clock spring control circuit •  Short to ground in clock spring control circuit •  Short to power supply in clock spring control circuit •  Heated steering wheel control unit malfunction •  Clock spring malfunction •  Dash-electrical supply unit malfunction •  CAN communication line malfunction •  Steering warmer switch malfunction: ―  Climate control unit malfunction

Diagnostic Procedure

Step	Inspection	Results	Action
1	DETERMINE IF MALFUNCTION CAUSE IS HEATED STEERING WHEEL SWITCH •  Using the M-MDS, display the following PIDs for the climate control unit. (See PID/DATA MONITOR INSPECTION.) ―  STR_HEAT_SW •  Turn the heated steering wheel switch on and off while the PID STR_HEAT_SW is displayed. •  Is the PID normal?	Yes	Go to the next step.
		No	Replace the climate control unit and perform the repair completion verification. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER (E)].) (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER (E)].)
2	INSPECT IG1 RELAY No.2 •  Inspect the IG1 relay No.2. (See RELAY INSPECTION.) •  Is the relay normal?	Yes	Go to the next step.
		No	Replace the IG1 relay No.2 and perform the repair completion verification. (See RELAY LOCATION [(E)].)
3*	INSPECT CLOCK SPRING POWER SUPPLY 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	Repair or replace the malfunctioning location and perform the repair completion verification.
4*	INSPECT HEATED STEERING WHEEL CONTROL UNIT POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT •  Inspect the applicable circuit for an open circuit. (See CIRCUIT INSPECTION.) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
5*	INSPECT CLOCK SPRING GROUND CIRCUIT FOR OPEN CIRCUIT •  Inspect the applicable circuit for an open circuit. (See CIRCUIT INSPECTION.) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
6*	INSPECT HEATED STEERING WHEEL CONTROL UNIT GROUND CIRCUIT FOR OPEN CIRCUIT •  Inspect the applicable circuit for an open circuit. (See CIRCUIT INSPECTION.) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
7*	INSPECT CLOCK SPRING CONTROL CIRCUIT FOR OPEN CIRCUIT •  Inspect the applicable circuit for an open circuit. (See CIRCUIT INSPECTION.) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
8*	INSPECT CLOCK SPRING CONTROL CIRCUIT FOR SHORT TO GROUND •  Inspect the applicable circuit for a short to ground. (See CIRCUIT INSPECTION.) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
9*	INSPECT CLOCK SPRING CONTROL CIRCUIT FOR SHORT TO POWER SUPPLY •  Inspect the applicable circuit for a short to power supply. (See CIRCUIT INSPECTION.) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
10*	INSPECT HEATED STEERING WHEEL CONTROL UNIT CONTROL CIRCUIT FOR OPEN CIRCUIT •  Inspect the applicable circuit for an open circuit. (See CIRCUIT INSPECTION.) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
11*	INSPECT HEATED STEERING WHEEL CONTROL UNIT CONTROL CIRCUIT FOR SHORT TO GROUND •  Inspect the applicable circuit for a short to ground. (See CIRCUIT INSPECTION.) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
12*	INSPECT HEATED STEERING WHEEL CONTROL UNIT CONTROL CIRCUIT FOR SHORT TO POWER SUPPLY •  Inspect the applicable circuit for a short to power supply. (See CIRCUIT INSPECTION.) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
13*	DETERMINE IF CAUSE OF MALFUNCTION IS CLOCK SPRING •  Inspect for continuity between the following terminals: ―  Clock spring connector terminal 4A and 5A ―  Clock spring connector terminal 4B and 5B ―  Clock spring connector terminal 4D and 5D •  Is there continuity?	Yes	Go to the next step.
		No	Replace the clock spring and perform the repair completion verification. (See CLOCK SPRING REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)
14*	INSPECT HEATED STEERING WHEEL UNIT CONTROL CIRCUIT FOR OPEN CIRCUIT •  Inspect the applicable circuit for an open circuit. (See CIRCUIT INSPECTION.) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
15*	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	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].) If the CAN communication is normal, perform the diagnosis from Step 1. •  If the malfunction recurs, replace the dash-electrical supply unit. (See DASH-ELECTRICAL SUPPLY UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER (E)].) (See DASH-ELECTRICAL SUPPLY UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER (E)].)
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
Repair completion verification	VERIFY IF MALFUNCTION CAUSE IS CORRECTED •  Always reconnect all disconnected connectors. •  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 seat 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 [HEATED STEERING WHEEL].)