B2338: Mirror Switch Circuit Short to Battery
Diagnostic trouble code B2338 indicates a short to battery voltage in the mirror switch circuit. This body code (B-code) relates to comfort and convenience systems. The control module detects that the voltage in the mirror switch circuit exceeds the expected threshold, typically because the wiring is making contact with a constant 12V source. The mirror switch controls functions such as power adjustment, heating, folding, or mirror illumination, depending on the vehicle configuration.
1. Commonly Affected Makes
2. Most Common Causes
- Mirror switch wiring shorted to battery power
- Internally damaged mirror switch causing a short
- Bent or corroded pins in the mirror switch connector causing a short
- Faulty mirror control module
- Damaged harness splice or junction exposing positive conductors
3. Symptoms You Will Notice
- Mirror functions (adjustment, heat, fold, light) may be inoperative or erratic
- Mirror may move or fold without input
- Blown fuse for the mirror circuit
4. Step-by-Step Diagnosis
Check for technical service bulletins (TSBs) related to mirror switch issues
Visually inspect the mirror switch connector for bent, broken, or corroded pins
Test the mirror switch circuit for voltage with a multimeter; look for battery voltage when key is on
Disconnect the mirror switch and check if the short to battery is still present in the harness
If the short disappears, replace the mirror switch; if not, repair the wiring short
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is generally safe to drive with this code, as it is low severity. However, mirror functions may not work properly, and a blown fuse could affect other systems.
How much does it cost to fix?▼
Repair costs typically range from $100 to $300, depending on whether the issue is a simple wiring repair or requires replacing the mirror switch assembly.