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 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 Reading and Clearing Diagnostic Trouble Codes
- Blown fuse No. 36 (10 A) in the under-dash fuse/relay box
- Faulty blower motor relay
- Poor ground at G504
- Poor or loose connections at the terminals