Q: Is an HDM headlight driver module the same as a relay switch?

asked by on

GM said the problem could be the Headlight Driver Module (HDM). Is that the same as the Low Beam Relay? Do I need another Quote? Over researched problem and got myself a bit confused, you think....I guess we'll find out tomorrow. Call if you need to. Thanks Barbara

My car has 157000 miles.
My car has an automatic transmission.

Unfortunately many manufacturers will call a part by one name while call it something else. However a module is a computer and a relay is more like a switch. If they recommended a module it is likely a computer failure.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Is an HDM headlight driver module the same as a relay switch?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: ABS issue??

Hello, thank you for writing in. When you make a hard stop, the majority of the stress gets put onto the brake pads and the rotors. While other components can absolutely be effected, these are what we have designed to...

Q: Blowing cold air, overheating. Thermostat is new.

You either have a bad water pump impeller is worn down and not pumping fluid or the radiator is clogged. I would recommend having the engine checked for a blown head gasket checking to see of combustion gas is getting...

Q: Rubbing noise from driver's front wheel while turning right

Look at the inner fender or track arm for signs of the tire rubbing on the parts. Your tires may be a little too wide for your vehicle. The fix may be to swap for a narrower tire. Also be...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...