1. Remove the battery cover..
2. Disconnect the negative battery cable..
3. Inspect for resistance and continuity between the seat warmer switch terminals using a tester.

If not as specified, replace the seat warmer switch.
Seat Track Position Sensor Removal/Installation [Two Step Deployment Control
System]
Seat Warmer Switch Removal/InstallationFilament Inspection
1. Turn the ignition switch to the ON position.
2. Turn the rear window defroster switch on.
CAUTION:
Directly touching the rear window defroster filament with the lead of the
tester could damage it. Wrap aluminum foil around the end of the lead and inspect
the filament by touc ...
Cruise Control Switch Inspection [Mzr 2.3 Disi Turbo]
1. Remove the battery cover..
2. Disconnect the negative battery cable and wait for 1 min or more..
3. Remove the driver–side air bag module..
4. Disconnect the clock spring connector (part wiring harness-side).
5. Measure the resistance between clock spring terminals K and M (part wiring ...
Seat Warmer Unit Inspection
WARNING:
Handling a front seat (with built-in side air bag) improperly can accidentally
operate (deploy) the air bag, which may seriously injure you. Read the service
warnings before handling a front seat (with built-in side air bag)..
CAUTION:
After removing a front seat ...