Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Audio Front Control Module (ACM) Self-Test: Activation
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WARNING: Before beginning any service procedure in this service information, refer to Health and Safety Precautions in GENERAL INFORMATION . Failure to follow this instruction may result in serious personal injury.
Refer to: HEALTH AND SAFETY PRECAUTIONS .
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NOTE: If the ACM , FCDIM (if equipped), FCIM , or FDIM (if equipped) are inoperative (blank or do not power on), obtain the ACM part number by referencing the label attached to the ACM chassis.
Turn the ACM on. - Operate the audio system in radio tuner AM /FM mode.
- Press and hold the eject button, and within 1 second, press and hold the seek up button. If supported, the speaker walk around test will begin, and the display will indicate each speaker as it is tested.NOTE: AHU Diagnostics refers to the ACM , EFP Diagnostics refers to the FCIM that communicates on the CAN (if equipped), and MFD Diagnostics (if supported) refers to the FCDIM (if equipped).
- To exit the self-diagnostic mode, turn the ACM off, or select "Exit Diagnostics."
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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