AutoCodes - OBDII Code List - B1A12 LINCOLN

B1A12 LINCOLN - Speaker 12 General Electric Failure

Repair Importance Level: 1/3
Repair Difficulty Level: 1/3    What is this?
Table of contents

B1A12 LINCOLN Possible Causes

  • Blown Audio Fuse
  • Faulty Speaker
  • Speaker harness is open or shorted
  • Speaker circuit poor electrical connection
  • Faulty Audio amplifier
  • Faulty Subwoofer amplifier
  • Faulty Audio Control Module (ACM)

How do I fix code B1A12 LINCOLN?

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.
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Tech Notes

B1A12:01 Speaker #12 General Electrical Failure
B1A12:11 Speaker #12 Circuit Short to Ground
B1A12:12 Speaker #12 Circuit Short to Battery
B1A12:13 Speaker #12 Circuit Open

Cost of diagnosing the B1A12 LINCOLN code

Labor: 1.0

The cost of diagnosing the B1A12 LINCOLN 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)

B1A12 LINCOLN Description

The Audio Control Module (ACM) directs audio signals to the audio amplifier and to the subwoofer amplifier in the form of an AC voltage. The amplifiers boost the audio signals and send them to the speakers. The ACM provides internal circuit protection for shorts to ground or shorts to voltage.
A short to ground or short to voltage in the circuitry to one of the speakers may cause multiple speakers to lose sound due to the built-in overload protection feature of the ACM. In this case, a speaker fault DTC sets, and this pinpoint test should be followed to isolate the damaged circuit.
To enable the amplifiers, the ACM sends voltage through individual enable/clip circuits. The circuits act as both an output (to enable the amplifier) and an input (to detect an overload condition). The voltage sent by the ACM passes through a variable resistor in each amplifier, then to ground. As the amplifier reaches maximum output, the resistance in the variable resistor decreases. This decreases the voltage drop, resulting in the ACM detecting a higher voltage on the enable/clip circuit. When the voltage reaches the clip threshold, the ACM clips the audio output signal to the amplifier (heard as distortion), in order to prevent damage to the amplifier and speakers.
The enable/clip status is based on the following voltages, as detected by the ACM:
- Less than 0.4 volts: amplifier disabled
- Between 3.8 and 6.7 volts (nominal): amplifier enabled
- Greater than 8.5 volts: amplifier clipped
An open in the enable/clip circuit causes the speakers powered by that particular amplifier to produce no sound because the enable signal does not reach the audio amplifier. A short to ground or short to voltage can cause severe distortion to be heard in the speakers.
OBDII Code B1a12 Lincoln - Speaker 12 General Electric Failure -

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