Disconnect the negative (-) battery terminal.

Remove the Air vent.

(Refer to the BD group - "Crash pad")

After removing the screws, remove the heater control module (A).

Disconnect the seat heater switch connectors (A).

Turn the ignition switch to ON, then turn the front seat heater switch ON.

Measure the output voltage between the positive terminal and ground.

Check that continuity exists between the terminals after turning the assist seat heater switch ON.

Measure the output voltage between the positive terminal and ground.