B1974 OBD-II Trouble Code: Passenger’s Seat Recline Forward Switch Circuit Short to Battery

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

EXCELLENT RATING ON

Cost of diagnosing the B1974 code

B1974 is a diagnostic trouble code (DTC) for "Passenger’s Seat Recline Forward Switch Circuit Short to Battery". 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 for $154.99 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $50.0 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 $154.99 $50.0
Toyota $154.99 $50.0
BMW $164.99 $50.0

*Estimates may vary by market

SCHEDULE B1974 DIAGNOSTIC Get a fair and transparent estimate upfront

B1974 code definition

The B1974 trouble code detects a passenger seat recline forward switch circuit malfunction.

What the B1974 code means

The B1974 code is a standard OBD-II trouble code that notes a circuit error in the passenger seat recline forward switch. This switch allows the angle of recline for the front passenger seatback to be adjusted forward. The switch itself is usually located on the outboard side of the seat base. If a circuit malfunction in the passenger seat recline forward switch is noticed by the body control module or the powertrain control module (PCM), then the B1974 trouble code might be triggered.

What causes the B1974 code?

There are two common problems that cause the B1974 code to be stored. The first common issue is damaged electrical components, either in the passenger seat recline forward switch, or in the power seat system. The second common issue is a failed passenger seat recline forward switch. It is also possible, though very rare, for a faulty body control module to be the cause of the B1974 trouble code.

What are the symptoms of the B1974 code?

When the B1974 trouble code is triggered, the front passenger seat will likely have problems adjusting the recline. The seatback will almost surely be incapable of reclining forward, and it will likely not be able to recline backwards, either. It is also common for the check engine soon warning light to illuminate when this code is detected.

How does a mechanic diagnose the B1974 code?

The B1974 code will be diagnosed using a standard OBD-II trouble code scanner. A trained mechanic will use the scanner to look at the freeze frame data and gather information about this code, while also checking to see if any other trouble codes are present. In the event that there are numerous codes detected, they should be assessed in the order that the scanner displays them in. The trouble codes will then be reset, the vehicle restarted, and the B1974 code checked for. If the code is no longer detected, then it is likely that an inaccurate detection, or an intermittent error is the problem.

If the B1974 code remains detected after the reset, then the technician will visually inspect all of the electrical components in the system, and replace any shorted wires, open or corroded connectors, and blown fuses. If the electrical system is in working order, then a failed passenger seat recline forward switch should be presumed.

After any replacements or repairs are made, the diagnosis should be halted so the trouble codes can again be reset, the vehicle restarted, and the B1974 code checked for. By doing this, the technician will know as soon as the problem is no longer present.

Common mistakes when diagnosing the B1974 code

The most common mistake made when diagnosing this code is the failure to follow the OBD-II trouble code diagnosis protocol. It is important that mechanics always follow the protocol step by step, to ensure efficient diagnoses and accurate repairs.

It is fairly common for damage to the electrical components to be overlooked, and fully operational passenger seat recline forward switches to be erroneously replaced as a result.

How serious is the B1974 code?

The B1974 trouble code will not keep a car from being drivable, or cause any drivability problems. However, the front passenger seat will likely not be able to adjust the recline. If the seatback is stuck folded forwards, it likely will not be usable. If the seatback is stuck in a heavily reclined position, it will not be safe for a passenger to occupy. Once the code is detected, an inspection should be scheduled.

What repairs can fix the B1974 code?

Repairs for the B1974 trouble code include:

Additional comments for consideration regarding the B1974 code

This code is a manufacturer specific code, which means that the definition changes by automaker. The B1974 code detects a passenger seat recline forward switch circuit error for some vehicles, but entirely different body issues for other cars. As always, the mechanic should be aware of the vehicle that is being worked on when this code is diagnosed.

Need help with a B1974 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.

OBD-II
trouble codes
B1974

No more waiting rooms! Our mechanics will come to you to diagnose and fix the B1974 code.

SCHEDULE B1974 DIAGNOSTIC
Get a $50 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(8600)

Rating Summary
8017
273
65
46
199
8017
273
65
46
199
 at YourMechanic

Brandon

9 years of experience
133 reviews
Brandon
9 years of experience
Ford Escort L4-2.0L - Check Engine Light is on - Nashville, Tennessee
Brandon showed up ahead of schedule, was very personable and diagnosed my problems. He also scheduled my next appointments which will be with him.
 at YourMechanic

William

23 years of experience
33 reviews
William
23 years of experience
Lexus IS250 V6-2.5L - Check Engine Light is on - Mableton, Georgia
Arrived early which was great. William was courteous, and attentive to the issue. Even though it took several attempts I'm so happy he was determined to fix it and he did!
 at YourMechanic

Dan

40 years of experience
1080 reviews
Dan
40 years of experience
Plymouth Grand Voyager - Check Engine Light is on - Lawrenceville, Georgia
Mr. Dan Barber was quite patient, courteous and quite knowledgeable. From my observation, Mr. Barber appears to be quite professional.
 at YourMechanic

Christopher

9 years of experience
120 reviews
Christopher
9 years of experience
Ford Fiesta L4-1.6L - Check Engine Light is on - Smyrna, Georgia
Chris communicated with us each step of the way up until his arrival. He listened well, was knowledgeable, and was prepared. He took the time to diagnose the problem, explained the what, why and how and provided a solution. I would definitely recommend him and will use him again.


More related articles

P2112 OBD-II Trouble Code: Throttle Actuator Control System - Stuck Closed
P2112 code definition Throttle Actuator Control System - Stuck Closed What the P2112 code means P2112 is a general ODB2 diagnostic trouble...
P2513 OBD-II Trouble Code: Event Data Recorder Request Circuit Low
P2513 P2513 code definition The P2513 code relates to a fuel composition sensor circuit malfunction, most commonly stemming from an issue in the operation of the variable cam timing (VCT) solenoid, which changes the timing of the camshaft position to...
P2337 OBD-II Trouble Code: Cylinder #2 Above Knock Threshold
P2337 P2337 code definition The P2337 trouble code signals a problem with the #2 cylinder being above the knock threshold. What the P2337 code means The P2337 code is a standard OBD-II trouble code that deals with the #2 cylinder...

Related questions

Does the OBD system use more than lights to communicate with the driver?
Malfunction Indicator Lamps (MIL) and audible alarms are currently the only means by which the On-Board Diagnostics (OBD) system can inform the driver of any issues that adversely affect the operation of the engine or other electronically controlled system. The...
Car wont start
Have the vehicle scanned and see if there is any engine codes. If you have codes then have them diagnosed first in order to more easily pinpoint the problem. If you are getting cam or crank sensor codes, then look...
P0016
Hi...Diagnostic Trouble Code P0016 (https://www.yourmechanic.com/article/p0016-obd-ii-trouble-code-camshaft-position-a-camshaft-position-correlation-bank-1-by-jay-safford) has many causes other than a failed camshaft position sensor. Other possible causes for Code P0016(https://www.yourmechanic.com/article/p0016-obd-ii-trouble-code-camshaft-position-a-camshaft-position-correlation-bank-1-by-jay-safford) to set include: the camshaft timing is wrong because the timing chain jumped teeth; the camshaft phaser is out...

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