The Blower And Heater Controls And The A/C System Do Not Work (With A/C)

The blower and heater controls and the A/C system do not work

Diagnostic Procedure:

1. Probable cause: HVAC control unit malfunction

2. Do the HVAC control power and ground circuit troubleshooting HVAC Control Power and Ground Circuit Troubleshooting (With A/C)

Also check for:

- HVAC DTCs How to Troubleshoot the Heating and A/C Systems (With A/C)
- Blown fuses No. 20 (7.5 A) or No. 25 (7.5 A) in the under-dash fuse/relay box
- Blown fuse No. 54 (30 A) in the main under-hood fuse/relay box
- Faulty blower motor relay
- Poor body ground at G402
- Poor or loose connections at the terminals