Diagnostic Fault Information
WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
| Low Speed Auxiliary Blower Motor Relay Switch B+ | 1 | 1 | - | - |
| Medium Speed Auxiliary Blower Motor Relay Switch B+ | 1 | 1 | - | - |
| High Speed Auxiliary Blower Motor Relay Switch B+ | 1 | 1 | - | - |
| Low Speed Auxiliary Blower Motor Relay Coil Ignition | 1 | 1 | - | - |
| Medium Speed Auxiliary Blower Motor Relay Coil Ignition | 1 | 1 | - | - |
| High Speed Auxiliary Blower Motor Relay Coil Ignition | 1 | 1 | - | - |
| Low Speed Auxiliary Blower Motor Relay Coil Control | 2 | 5 | 2 | - |
| Medium Speed Auxiliary Blower Motor Relay Coil Control | 3 | 5 | 3 | - |
| High Speed Auxiliary Blower Motor Relay Coil Control | 4 | 5 | 4 | - |
| Low Speed Auxiliary Blower Motor Relay Switch Output Control | 5 | 2 | 1 | - |
| Medium Speed Auxiliary Blower Motor Relay Switch Output Control | 5 | 3 | 1 | - |
| High Speed Auxiliary Blower Motor Relay Switch Output Control | 5 | 4 | 1 | - |
| Auxiliary Blower Motor Control | 5 | 1 | 1 | - |
| Auxiliary Blower Motor Ground | - | 1 | - | - |
| Auxiliary HVAC Control Assembly Ground | - | 1 | - | - |
| Front Auxiliary HVAC Control Assembly Ground | - | 1 | - | - |
| 1. Auxiliary Blower Motor Inoperative - All Speeds 2. Auxiliary Blower Motor Inoperative - Low 3. Auxiliary Blower Motor Inoperative - Medium 4. Auxiliary Blower Motor Inoperative - High 5. Auxiliary Blower Motor Always ON |
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