B1924

B1924-49-CONTROL HEAD - INTERNAL ELECTRONIC FAILURE

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

- When Monitored:
With the ignition on.

- Set Condition:
If the A/C Heater Control has detected an internal fault. If the DTCs status changes from active to stored it will stay in memory for 100 ignition cycles.





Always perform the HVAC Pre-Diagnostic Troubleshooting procedure before proceeding. Initial Inspection and Diagnostic Overview.
CHECK THE A/C HEATER CONTROL

Repair

- Check for any controller software updates if applicable. If an update is available, reprogram the controller with the latest software. If no software updates are available, replace and program the A/C Heater Control. A/C And Heater Control - Removal.
- Perform the HVAC VERIFICATION TEST. HVAC Verification Test.