Blower and Heater Controls Do Not Work (Without A/C)

Blower and heater controls do not work

Diagnostic Procedure:

1. Probable cause: Heater control panel malfunction or faulty power or ground circuits

2. Check for DTCs using the HDS or the self-diagnostic function How To Troubleshoot The Heating System (Without A/C)

3. Do the heater control power and ground circuit troubleshooting Heater Control Power and Ground Circuit Troubleshooting (Without A/C)

Also check for:

- 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