Head-Up Display Dimming Switch Circuit
Table of contents
B3634 GMC Possible Causes
- Faulty Head-Up Display Dimming Switch
- Head-Up Display Dimming Switch harness is open or shorted
- Head-Up Display Dimming Switch circuit poor electrical connection
How do I fix code B3634 GMC?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the B3634 GMC code
The cost of diagnosing the B3634 GMC code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
B3634 GMC Description
The Head-Up Display (HUD) monitors the HUD dimming up switch signal circuit in order to perform the switch functions. When the HUD dimming up switch is depressed and the ignition is in the RUN position, the dimming switch signal to the HUD is low. When the HUD detects that the HUD dimming switch signal is low for greater than 60 seconds, the Diagnostic Trouble Code (DTC) B3634 sets.