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.
Signal Description, Audio Module (AUD)
GENERAL
There are several versions of the audio module (AUD) and the version found in a specific vehicle is dependent on model and equipment level. This list does not describe the different versions, only the different functions of the connectors and signals.
| U= | DC voltage in volts (V) | UAC = | AC voltage in volts (V) |
| Ubat = | Battery voltage (V) | f = | Frequency in Hertz (Hz) |
| Ulow = | Voltage approximately 0 V | t = | Time in seconds (s) |
| PWM = | Pulse width modulated signal in % |
| Breakout box connection | Control module terminal | Signal type | Ignition on | Miscellaneous |
| - | #1 | +30-feed | Ubat | - |
| - | #2 | Ground | Ulow | - |
| Breakout box terminal | Control module terminal | Signal type | Ignition on | Miscellaneous |
| - | #1 | Input signal, MOST | - | Optical input signal when the MOST network is activated. |
| - | #2 | Output signal, MOST | - | Optical output signal when the MOST network is activated. |
| Breakout box terminal | Control module terminal | Signal type | Ignition on | Miscellaneous |
| - | #1 | Analog output signal, speaker left front door (-) | U = 0 - 19 V | Voltage depends on the output power from the control module. |
| - | #2 | Analogue output signal, central loudspeaker (-) | U = 0 - 11 V | Voltage depends on the output power from the control module. |
| - | #3 | Analog output signal, speaker right front door (-) | U = 0 - 19 V | Voltage depends on the output power from the control module. |
| - | #4 | Analog output signal, speaker left rear door (-) | U = 0 - 19 V | Voltage depends on the output power from the control module. |
| - | #5 | Analog output signal, speaker right rear door (-) | U = 0 - 19 V | Voltage depends on the output power from the control module. |
| - | #6 | - | - | - |
| - | #7 | - | - | - |
| - | #8 | - | - | - |
| - | #9 | Analog output signal, speaker left front door (+) | U = 0 - 19 V | Voltage depends on the output power from the control module. |
| - | #10 | Analogue output signal, central loudspeaker (+) | U = 0 - 11 V | Voltage depends on the output power from the control module. |
| - | #11 | Analog output signal, speaker right front door (+) | U = 0 - 19 V | Voltage depends on the output power from the control module. |
| - | #12 | Analog output signal, speaker left rear door (+) | U = 0 - 19 V | Voltage depends on the output power from the control module. |
| - | #13 | Analog output signal, speaker right rear door (+) | U = 0 - 19 V | Voltage depends on the output power from the control module. |
| - | #14 | - | - | - |
| - | #15 | - | - | - |
| - | #16 | +30-feed (RDB Logic Feed) | Ubat | - |
| Breakout box terminal | Terminal Control module | Signal type | Ignition on | Miscellaneous |
| - | #1 | Analogue signal, headphones 1 left (+) | - | Analogue output signal when the headphones socket is in use. |
| - | #2 | Analogue signal, headphones 1 right (+) | - | Analogue output signal when the headphones socket is in use. |
| - | #3 | Analogue signal, headphones 2 left (+) | - | Analogue output signal when the headphones socket is in use. |
| - | #4 | Analogue signal, headphones 2 right (+) | - | Analogue output signal when the headphones socket is in use. |
| - | #5 | - | - | - |
| - | #6 | - | - | - |
| - | #7 | - | - | - |
| - | #8 | - | - | - |
| - | #9 | - | - | - |
| - | #10 | - | - | - |
| - | #11 | - | - | - |
| - | #12 | - | - | - |
| - | #13 | Analogue signal headphones 1 (-) | U = Ulow | - |
| - | #14 | Analogue signal headphones 2 (-) | U = Ulow | - |
| - | #15 | Headphones check 1 and 2 (-) | U = Ulow | Analogue input signal when forward/back buttons and MODE buttons are used. |
| - | #16 | Headphones check 1 (+) | U = 5.0 V (no headphones connected) U = 4.02 V (no button activated) U = 3.16 V (back button activated) U = 2.37 V (forward button activated) U = 0.9 V (MODE button activated) |
Analogue input signal when forward/back buttons and MODE buttons are used. |
| - | #17 | Headphones check 2 (+) | U = 5.0 V (no headphones connected) U = 4.02 V (no button activated) U = 3.16 V (back button activated) U = 2.37 V (forward button activated) U = 0.9 V (MODE button activated) |
Analogue input signal when forward/back buttons and MODE buttons are used. |
| - | #18 | - | - | - |
| - | #19 | - | - | - |
| - | #20 | - | - | - |
| - | #21 | - | - | - |
| - | #22 | - | - | - |
| Breakout box terminal | Terminal Control module | Signal type | Ignition on | Miscellaneous |
| - | #1 | - | - | - |
| - | #2 | - | - | - |
| - | #3 | Analogue output signal, microphone passenger side/front (+) | U = 8 V | - |
| - | #4 | Analog output signal, microphone rear (-) | U = Ulow | Ground. |
| - | #5 | Analog output signal, microphone driver's side (+) | U = 8 V | - |
| - | #6 | - | - | - |
| - | #7 | - | - | - |
| - | #8 | - | - | - |
| - | #9 | - | - | - |
| - | #10 | - | - | - |
| - | #11 | - | - | - |
| - | #12 | - | - | - |
| - | #13 | Analogue output signal, microphone passenger side/front (-) | U = Ulow | Ground. |
| - | #14 | Analog output signal, microphone rear (+) | U = 8 V | - |
| - | #15 | Analog output signal, microphone driver's side (-) | U = Ulow | Ground. |
| - | #16 | - | - | - |
| - | #17 | - | - | - |
| - | #18 | - | - | - |
| - | #19 | - | - | - |
| - | #20 | - | - | - |
| - | #21 | - | - | - |
| - | #22 | - | - | - |
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.