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 |
|---|---|---|---|---|
| Headlamp Switch Off Signal | B257A 00 | 2 | 2* | - |
| Park Lamp Switch On Signal | B257A 00 | B257A 00 | B257A 00* | - |
| Headlamp Switch On Signal | B257A 00 | 2 | 2* | - |
| Headlamp Ground | - | 1 | - | - |
| * Internal damage to the headlamp switch may occur if shorted to B+ 1. Headlamps Malfunction - Low Beam 2. Headlamp Switch Malfunction |
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