B11DA

B11DA-96-ITOS CABIN TEMPERATURE SENSOR - COMPONENT INTERNAL FAILURE

For a complete wiring diagram, refer to the Wiring Information.

Theory of Operation

The HVAC A/C Heater Control uses a variety of sensors to adjust HVAC operation to obtain optimal performance. These sensors are continuously monitored by the A/C Heater Control to assure that they are in a calibrated range and are functioning properly. The Integrated Thermal Optical Sensor (ITOS) in mounted in the front of the A/C Heater Control and is a non-serviceable component.

- When Monitored:
With the ignition on.

- Set Condition:
The A/C Heater Control detects a malfunction in the Integrated Thermal Optical Sensor (ITOS).





Always perform the HVAC Pre-Diagnostic Troubleshooting procedure before proceeding. HVAC Pre-Diagnostic Troubleshooting Procedure.
REPLACE THE A/C HEATER CONTROL

This DTC detects a problem with the ITOS which is an internal sensor circuit in the controller and is not serviceable.

Repair

- Inspect the A/C Heater Control for debris that my be inhibiting the functionality of the Integrated Thermal Optical Sensor and clean as necessary. If no problem is found, replace and program the A/C Heater Control. A/C And Heater Control - Removal.
- Perform the HVAC VERIFICATION TEST. HVAC Verification Test.