B1472 OBD-II Trouble Code: Lamp Headlamp Input Circuit Short to Ground

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the B1472 code

B1472 is a diagnostic trouble code (DTC) for "Lamp Headlamp Input Circuit Short to Ground". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE B1472 DIAGNOSTIC Get a fair and transparent estimate upfront

What the B1472 code means

Vehicles equipped with a Smart Junction Box (SJB) send reference signals to the headlamps controlling on/off functions, headlamps and parking lamps. When the SJB detects that the headlamp switch has been turned to the “on” position and the multifunction switch set to “low beam” position, it routes voltage to the left and right low-beam headlamps.

What causes the B1472 code?

  • Failed wiring, terminals or connectors
  • Headlamp switch failure
  • Lighting control module (LCM) failure
  • SJB failure

What are the symptoms of the B1472 code?

Symptoms can include:

  • Headlights that will not work on high beams
  • Headlights won’t come on

How does a mechanic diagnose the B1472 code?

  • Using a good quality code reader/scanner, check for any headlamp-related trouble codes. B1696, B1791, B1793 or B2008 may accompany this trouble code.

  • A factory wiring diagram will also be necessary for this diagnosis and repair.

  • With the ignition in ON position and headlamp switch OFF, use a digital volt/ohmmeter (DVOM) to monitor the SJB’s parameter ID’s (PIDs).

  • If the PID indicates the headlamps as ON, monitor the PIDs from the SJB as you move the headlamp switch through all positions. Ensure that the PIDs agree with factory specs.

  • If not, disconnect the headlamp switch. Check the headlamp switch for continuity.

  • If headlamp switch checks OK, disconnect the negative battery cable. Measure resistance between the headlamp switch harness side and ground. Resistance should be less than 5 ohms.

  • If resistance is high, clear all trouble codes and test resistance between headlamp switch/harness side and ground, pin by pin. Resistance should be under 10k ohms.

  • If resistance is high, check the headlamp switch input circuits for an open condition. Measure resistance between the headlamp switch pins and and the SJB. Resistances should be under 5 ohms.

  • If resistances are high, check the SJB’s output and check the headlamps for a short to voltage. Clear trouble codes and perform a self-test.

  • Check the SJB connectors for corrosion, damaged pins, pushed-out pins. Reconnect all SJB connectors and see if the system operates properly. If not, replace the SJB.

Common mistakes when diagnosing the B1472 code

Often, technicians replace the headlamp switch or multifunction switch without running a full set of diagnostic tests first.

How serious is the B1472 code?

A B1472 code can result in headlamps that will only work on low beam setting, work intermittently or may not work at all.

What repairs can fix the B1472 code?

Additional comments for consideration regarding the B1472 code

Be certain to use the right DVOM probes while troubleshooting a B1472 code, to avoid damage or failure of parts.

Need help with a B1472 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

trouble codes
B1472
Check Engine Light

No more waiting rooms! Our mechanics will come to you to diagnose and fix the B1472 code.

SCHEDULE B1472 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

5,170

Rating Summary
4,765
197
50
27
131
4,765
197
50
27
131

Fred

16 years of experience
364 reviews
Fred
16 years of experience
Mercedes-Benz E500 - Check Engine Light is on - Conroe, Texas
Fred was very friendly and thorough to get to the root of the issue. Even when he could not find a fault to why my engine light was on, he went above and beyond to make absolutely sure that the concern was minimized. Turns out, all that needed to be done was a reset but his diagnostic to address my issues was very intricate and appreciated.

David

17 years of experience
37 reviews
David
17 years of experience
Chevrolet Cruze - Check Engine Light is on - Aurora, Colorado
David was on time, professionalisms & honest! I would definitely request him again and pass along to friends/family.

John

18 years of experience
18 reviews
John
18 years of experience
Dodge Ram 1500 - Check Engine Light is on - Memphis, Tennessee
Demonstrated good integrity. Advised me when work I thought needed done was unnecessary and was helpful in identifying issues that needed to be addressed

Robert

21 years of experience
17 reviews
Robert
21 years of experience
Chrysler 200 - Check Engine Light is on - Fort Worth, Texas
Robert did a good job working on my car and letting me know what's needed to keep my car driving smoothly.


More related articles

P0592 OBD-II Trouble Code: Cruise Control Multi-Function Input "B" Circuit Low
P0592 means that the PCM has detected a fault in the cruise control input circuit, often due to a failed cruise control switch.
P2111 OBD-II Trouble Code: Throttle Actuator Control System - Stuck Open
P2111 trouble code definition Throttle Actuator Control System - Stuck Open What the P2111 code means In this case the code definition...
P0773 OBD-II Trouble Code: Shift Solenoid E Electrical
P0773 means there is a problem with the solenoid valve due to a faulty shift solenoid, low transmission fluid, or a poor electrical connection.

Related questions

Car hesitates when accelerating

Hi there. It is very likely that a faulty throttle position sensor (TPS) is causing your problem. The TPS receives signals from your computer telling it where to position the throttle at any given time. A faulty TPS will also...

I have gray smoke coming out of my tailpipe but it's not heavy smoke and my car check engine light is orange​ my car shut off

You did not mention why the radiator was replaced but I think your engine was overheated causing the head gasket to go bad. This would cause the white smoke out of the tail pipe and an engine misfire and overheating...

P2107 - 2005 Ford Freestyle

Hello. P2107 is the code for an issue with the vehicle's throttle control module processor. Basically, the computer has detected an issue with the vehicle's electronic throttle body and has put the vehicle in safe mode. The throttle body...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com