AMBIENT TEMPERATURE WARNING ALARM
id092200020600
Purpose
• The ambient temperature warning alarm warns the user when the ambient temperature is 4 °C {39 °F} or less and the road surface may be frozen.
Function
• When the instrument cluster receives an ambient temperature signal of −19—4 °C {−2.2—39.0 °F}, which is sent from the PCM as a CAN signal, it operates the ambient temperature warning alarm.
• After the instrument cluster operates the ambient temperature warning alarm, it does not operate the alarm until it receives an ambient temperature signal of 6 °C {43 °F} or more.
• The ambient temperature warning alarm operates in the pattern shown in the figure.
Construction
• The ambient temperature warning alarm sounds using the buzzer built into the instrument cluster.
Operation
1. When the ignition is switched ON (engine off or on), the instrument cluster receives an ambient temperature signal from the PCM (1).
2. When the instrument cluster receives an ambient temperature signal of −19—4 °C {−2.2—39.0 °F}, it turns on (2) the transistor.
3. When the transistor is turned on, the ground circuit with the ambient temperature warning alarm is established and the ambient temperature warning alarm operates (3).
Fail-safe
• Not applicable
