My DOD Bass Compressor stopped working. The LED light comes on weakly when a cable is plugged in, even with a brand new battery. No sound comes out of the output, and the LED that appears dimly lit does not turn off when the button is pressed. Anyone have any ideas?
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Kevin , this is a very complex way of stoplamp control , I will post GM service Description and Operation of how they work an let you deside if you want to tackle this ! Do the center high mount brake lights work ?
The brake pedal position sensor is a resistive device used to sense the action of the driver's application of the brake pedal. The brake pedal position sensor provides an analog signal that will increase as the brake pedal is pressed.
The brake pedal position sensor receives both a 5-volt reference voltage and a low reference signal from the electronic brake control module (EBCM). When the brake pedal is pressed, a variable signal is applied from the brake pedal position sensor to the EBCM through the brake sensor signal circuit. The fuse block left rear supplies battery positive voltage to the bass relay switch through the BASS fuse. One side of the bass relay coil is permanently grounded at G402. The EBCM supplies voltage to the bass relay coil upon receiving the signal from the brake pedal position sensor. The switch contacts of the bas relay close and battery positive voltage is applied through the bas relay switch to the center high mounted stop lamp (CHMSL), and to the turn signal/hazard flasher module through the stop lamp switch signal circuit. The ground for the CHMSL is applied from G402. The turn signal/hazard flasher module then supplies voltage to the left and right stop lamps in the tail lamp assemblies that have ground at G401 and G402. For export vehicles the stop lamps receive battery positive voltage directly from the bass relay.
There could be a code stored in the EBCM - electronic brake control module - DTC B3903 Stop Lamp Relay Circuit
DTC C0278 Brake Pedal Position Sensor Not Calibrated
there are several other codes that pertane to the brake lights . you could try Replaceing the bas relay !
Fuse Block - Left Rear
In the passenger compartment, under the left side of the rear seat at carpet.
Try jacking up car and put on stands as high as poss as you could have air returning when the pedal is returned ,so jack up car pump pedal 4 times fast and hold down bleed l/h/s/first ,do 2 times then the r/h/side and then push down pedal clamp rubber flex hose over back axlewith small G clamp if pedal good do same to FRONT
Common cause is weak battery (the LED is NOT an indication the battery is good as it will still light long after the battery is too weak). The second common problem is the input and output cables are backwards. The unit will pass audio with them backward, but NOT when you activate.
The red light means NOTHING regarding the battery condition... If battery is not new, try a new one.
I have seen several problems... some people get the cables backwards for input and output. The INPUT cable is what turns on the battery and it has to be a mono cable.
ANOTHER common problem with ABUSED pedals is that the jack used for external power adapter gets smashed at some point and cracks the circuit board near it. USUALLY the light will not come on when this happens.
Byond this, it probably requires repair. Some are easy to open and others are a bear to get the circuit board out... key is to NOT force very much when working on these.