Overhead Travel Information System

NAME OF CODE
Ambient Temperature Sensor Failure

WHEN MONITORED
With ignition on

SET CONDITION
BCM senses an abnormally high or low voltage on its input

THEORY OF OPERATION
The ambient temperature sensor is a thermistor for which the BCM provides a 5V pull-up. Under normal operating conditions (-40 to 85° C) this voltage should be between 0.313 V and 4.88 V.

PROBABLE CAUSES
- Wiring open circuit
- Wiring short to ground
- Wiring short to battery
- Failed ambient temp sensor
- Failed BCM