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.
Amplifier Interface (Non - GMLAN)
A 30A AMPLIFIER fuse, located in the rear BEC, provides the main amplifier power for the amplifier. The radio remote enable circuit provides a switched 12-volt output to the non-GMLAN amplifier. This output controls the power - state of the amplifier. To respond quickly to audio input and control signals, the amplifier is ON in all vehicle power modes except OFF and CRANK Request. However, when the amplifier is asleep it still must allow chime functionality. The internal amplifier bridges are fully powered and unmuted when the amplifier receives the switched 12-volt input.
The radio provides a amp control output circuit to control overall muting of the non-GMLAN amplifiers. The amplifier receives PWM signals on the circuit at varying duty cycle percentages for controlling the muted and unmuted functions of the amplifier. The radio monitors the remote amp control circuit for faults and sets the appropriate DTC when detected.
The function table below shows the four possible amplifier mute functions.
| % Duty Cycle Out | Function |
|---|---|
| 0% (0Vlow Vdc) | FOUR_CHANNEL_UNMUTE |
| 50% | REAR_MUTE (input must be 2-channel) |
| 75% | SIX_CHANNEL_UNMUTE |
| 100% (5V high Vdc) | ALL |
NO RELATED
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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.