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.

Check Engine Light
trouble codes
B1472

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

(6,295)

Rating Summary
5,825
224
52
35
159
5,825
224
52
35
159

JOHNNY

33 years of experience
96 reviews
JOHNNY
33 years of experience
BMW 325Ci - Check Engine Light is on - Sacramento, California
He was great explained everything to me and have now booked him for another appointment. Thanks johnny.

Ronald

41 years of experience
93 reviews
Ronald
41 years of experience
Mercedes-Benz C300 - Check Engine Light is on - Spring, Texas
Mister Ron was very nice and took time out to explain any concerns I might have about my car. He also made sure he communicated with me when he was on his way, once he was outside, and when we was done working on my car. I appreciate that considering I have a newborn that I had to look after.

Ronald

41 years of experience
93 reviews
Ronald
41 years of experience
Ram 1500 - Check Engine Light is on - Spring, Texas
Extremely satisfied with the service, he was able to come out and diagnose almost immediately. We purchased the parts, he came back installed them and been running great since. Would definitely recommend him and will not hesitate to call again if needed.

Scott

36 years of experience
802 reviews
Scott
36 years of experience
Dodge Neon - Check Engine Light is on - Tempe, Arizona
I truly enjoy Scott as he has done work for me in the past. Scott is very friendly, knowledgeable, and a true professional! I highly recommend him.


More related articles

P003A OBD-II Trouble Code: Turbocharger/Supercharger Boost Control "A" Position Exceeded Learning Limit
The P003A trouble code means the Electronic Computer Module (ECM) has detected an issue in the turbocharger or supercharger system.
P0146 OBD-II Trouble Code: O2 Sensor Circuit No Activity Detected (Bank 1, Sensor 3)
P0146 P0146 code definition O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 3) What the P0146 code means P0146 is the OBD-II generic code indicating the O2 sensor for bank 1 sensor 3 fails to have a voltage change...
P0774 OBD-II Trouble Code: Shift Solenoid E Intermittent
P0774 means the PCM registered a problem in shift solenoid E, caused by low ATF level, failed shift solenoid, or blocked transmission passages.

Related questions

Car stalling when idling

The fuel leak needs to be identified and fixed before you drive it due to the fire hazard. The other problems can be checked after the fuel leak is fixed. The fuel leak may be the whole issue or the...

Failed emissions codes P0134, P0327, P3fff

The P0134 code means that the air fuel ratio sensor is not operating. Most of the time it will need replacing to correct. The P0327 code means that your knock sensor is not getting enough voltage. The P03FF may indicate...

I have a trouble code P0622: Generator Filed Terminal Circuit and my battery light is on.

The generator is the same thing as the alternator. If you are running through batteries, then it's likely that the amount of voltage from the alternator is too much for the battery to take. The other factor may be that...

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