Steering Wheel Heater Switch: Description and Operation

System Description

The heated steering system is controlled by the smart entrance control unit. The heated steering system operates only for approximately 30 minutes after heated steering switch is turned "ON".
Then the heated steering system is turned "OFF" when the heated steering switch is turned "ON" again or ignition switch "OFF" within 30 minutes after heated steering system "ON".

Power is supplied at all times
- to smart entrance control unit terminal 49
- through 10 A fuse [No. 13, located in the fuse block (J/B)]
- to heated steering relay terminal 3
- through 10 A fuse (No. 72, located in the fuse and fusible link box)

With the ignition switch in the ON or START position, power is supplied.
- through 10 A fuse [No. 10, located in the fuse block (J/B)]
- to the heated steering relay terminal 1 and
- to smart entrance control unit terminal 27.

Ground is supplied
- to terminal 2 and 5 of heated steering switch and
- to combination switch (heated steering switch) terminal 2
- through body grounds M9, M25 and M87.

When the heated steering switch is turned ON, ground is supplied
- through terminal 1 of heated steering switch
- to smart entrance control unit terminal 4.

Terminal 40 of the smart entrance control unit then supplies ground to the heated steering relay terminal 2. With power and ground supplied, the heated steering relay is energized.

Power is supplied
- through terminal 5 of heated steering relay
- to heated steering switch terminal 4 and
- to combination switch (heated steering switch) terminal 1.
- through terminal 3 of combination switch (heated steering switch)
- to the heated steering (thermostat).

Ground is supplied for heated steering
- through heated steering
- to combination switch (heated steering switch) terminal 4. With power and ground supplied, the heated steering heats.

When the system is activated, the heated steering indicator lamp illuminates in the heated steering switch.