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 Specification, Digital Audio Broadcast Module (DABM)
GENERAL
All the values given below are between connections stated in column 1 and connection #A1 in column 2 (power ground). This applies unless otherwise indicated in brackets.
It is important to connect the breakout box and check the ground terminals before taking readings.
| U= | DC voltage in volts (V) | UAC = | AC voltage in volts (V) |
| Ubat = | Battery voltage in volts (V) | f = | Frequency in Hertz (Hz) |
| Ulow = | Voltage approximately 0 V | t = | Time in seconds (s) |
| PWM = | Pulse width modulated signal in % | % duty = | Duty cycle (pulse ratio) in percent (%) |
| Breakout box connection | Control module terminal | Signal type | Ignition on | Ignition off | Miscellaneous |
| #1 | #C1-1 | 30 supply | U = Ubat | U = Ubat | - |
| #2 | #C1-2 | ground, 30 supply | U=Ulow | U=Ulow | - |
| Breakout box connection | Control module terminal | Signal type | Ignition on | Ignition off | Miscellaneous |
| - | #C2-1 | Antenna signal | - | - | Input signal VHF Band 3 |
| - | #C2-2 | Antenna signal | - | - | Fender |
| - | #C2-3 | Antenna signal | - | - | Input signal Band L |
| - | #C2-4 | Antenna signal | - | - | Fender |
| Breakout box connection | Control module terminal | Signal type | Ignition on | Ignition off | Miscellaneous |
| - | #C3-1 | Output signal, MOST | - | - | Optical output signal |
| - | #C3-2 | Input signal, MOST | - | - | Optical input signal |
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
No obligation. See pricing before you book.