Front seat cushion

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the negative battery cable and wait 1 min or more. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
Disconnect the seat warmer unit connector.
Verify that the continuity between the seat warmer unit terminals is as indicated in the table.

Fig 1: Seat Warmer Unit Continuity Reference Chart
Courtesy of MAZDA MOTORS CORP.

Fig 2: Inspecting Seat Warmer Unit
Courtesy of MAZDA MOTORS CORP.
- If not as indicated in the table, replace the front seat cushion pad. (See FRONT SEAT CUSHION TRIM REMOVAL/INSTALLATION .)
Connect the seat warmer unit connector.
Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
Switch the ignition to ACC or ON (engine off or on).
Turn the seat warmer switch off and leave it for 30 min or more to let the temperature around the thermistor reach normal temperature.
Measure the resistance between seat warmer unit connector terminals 6C and 6D, and record it together with the temperature around the thermistor.

Fig 3: Measuring Resistance Between Seat Warmer Unit Connector Terminals 6C And 6D
Courtesy of MAZDA MOTORS CORP.
NOTE:
- Measure the temperature around the thermistor using a dry-bulb thermometer.
Operate the seat warmer switch to warm the seat heater unit with an indicator light turned on.
Measure the resistance between seat warmer unit connector terminals 6C and 6D, and record it together with the temperature around the thermistor.
Operate the seat warmer switch to warm the seat heater unit with three indicator lights turned on.
Measure the resistance between seat warmer unit connector terminals 6C and 6D, and record it together with the temperature around the thermistor.
Verify that the resistance varies as the temperature increases.
- If the resistance does not change, replace the front seat cushion pad. (See FRONT SEAT CUSHION TRIM REMOVAL/INSTALLATION .)