| Description |
| • |
Battery voltage: 12.4V or above
|
| • |
Engine : Running
|
| • |
Ambient temperature and coolant temperature
|
|
Ambient Temperature |
Coolant Temperature |
PTC Operation |
|
Below -20°C (-4°F) |
Below 75°C (167°F) |
ON |
|
10°C (50°F) |
Below 65°C (149°F) |
ON |
|
12°C (53.6°F) or above |
- |
OFF |
|
- |
80°C (176°F) or above |
OFF |

Replacement 1. Remove the heater unit assembly. (Refer to Heater - "Heater Unit") 2.
Inspection Operating Logic Test (Manual only) Inspect the PTC operation by confirmation logic as follows; 1. Entering (1) Set the Floor mode and maximum heating position.
Description The ambient temperature sensor is located at the front of the condenser and detects ambient air temperature. It is a negative type thermistor; resistance will increase with lower temperature, and decrease with higher temperature.
Diagnosis with Diagnostic tool 1. In the body electrical system, failure can be quickly diagnosed by using the vehicle diagnostic system (Diagnostic tool). The diagnostic system (Diagnostic tool) provides the following information.