Pinpoint Test T : B1B71:21, B1B71:22, B1B71:2F: Notes
Refer to AUTOMATIC CLIMATE CONTROL SYSTEM for schematic and connector information.
Normal Operation and Fault Conditions
Evaporator temperature sensor, REFER to: Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC)
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1B71:21 | Evaporator Temperature Sensor: Signal Amplitude < Minimum | This Continuous Memory Diagnostic Trouble Code (CMDTC) and on-demand DTC sets when the BCM senses lower than expected voltage from the evaporator temperature sensor. |
| B1B71:22 | Evaporator Temperature Sensor: Signal Amplitude > Maximum | This Continuous Memory Diagnostic Trouble Code (CMDTC) sets when the BCM senses greater than expected voltage from the evaporator temperature sensor. |
| B1B71:2F | Evaporator Temperature Sensor: Signal Erratic | This on-demand DTC sets when the BCM senses erratic voltages from the evaporator temperature sensor. |
Possible Sources
- Wiring, terminals or connectors
- Evaporator temperature sensor
- BCM