Problem with my Business Unit
- Thread starter Herbert
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champion
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herbert;509690 said:
Initially i thought my car doesnt car with amp, when i was checking my speakers, etc. They ended up found the amplifier behind the glove compartment. If you cant find it behind the boot area, give it a try at the glove area.
bimmerholic
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champion;509737 said:
Really...how does it look like? I don't have one in my trunk though...
When i remove my glove comp, i see a stretch long of fuses+relays. Is the amp seated behind it?
Herbert
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Guys,
FINALLY my radio/CD player is working again. Many thanks to all our bros that have given their suggestions/opinions. Thanks also goes to Vincent Hor for recommending me to GLS Auto at USJ who had finally located the fault. Fault is a loose speaker connector inside the front left passenger door.
FYI, my 525i local AB 2002 model does not come with any amplifier. The amp is actually intergrated with the radio. I know this because GLS stripped off all the rear panels.
FINALLY my radio/CD player is working again. Many thanks to all our bros that have given their suggestions/opinions. Thanks also goes to Vincent Hor for recommending me to GLS Auto at USJ who had finally located the fault. Fault is a loose speaker connector inside the front left passenger door.
FYI, my 525i local AB 2002 model does not come with any amplifier. The amp is actually intergrated with the radio. I know this because GLS stripped off all the rear panels.
bimmerholic
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johnj;510102 said:
Is yours the one that's smaller in size (silver) or the larger one (black)? I think the black one is a DSP amp.
sewell;510355 said:
PDC and Speaker are two different things. It just you are implying that when one bulb in your sitting room is blown, the whole house also dont have light???
What herbert stated earlier is very illogical. I suspect that while dismantling the HU and checking the wiring, the technician may have reconnect back the speaker wires for the distribution connector after the HU without realizing it.
bimmerholic
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jarance;510367 said:
Isn't the PDC tone echoed through the car speakers? Meaning if the obstacle is at the front left of the bumper, and so only the front left speaker beeps...correct me if i'm wrong.
bimmerholic
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jarance;510393 said:
This is just my guess...
Since a normal reverse sensors adopts a buzzer/speaker to output a tone, PDC uses the car speakers to do the same. Thus all it needs is to get the output from the controller unit to a speaker. So regardless with you having the HU on/off, it'll still be able to output the sound through the speaker.
I need someone to confirm if this is how PDC works...i read somewhere that PDC uses the car speakers in the car to point to the driver where the obstacle is.
Extract from BMW WDS
Park distance control (PDC)
The park distance control assists the driver when parking and manoeuvring and helps to avoid damage to the car when parking into tight spaces or at blind spots.
The system monitors the distance between the car and an obstacle on the basis of the ultrasonic echo sounder method.
For this purpose, there are 4 ultrasonic transducers integrated in the front and rear bumpers, thus making it possible to monitor the area in front and behind the vehicle.
The control unit cyclically measures the distances between each transducer and any obstacle.
The distance between the car and the nearest object is signalled proportionally to the driver as he approaches it by way of the corresponding tone generator (front or rear).The less the distance to the obstacle, the faster the tone sequence.A distance of below 20 cm is indicated by a continuous tone.In order to distinguish between them, the tone pitch at the front and at the rear differs.
In order to avoid a long persistent continuous tone, the acoustic signal is switched off when driving alongside a wall.However, the distance warning is reactivated if the car continues to approach the obstacle.
The electronic control unit monitors correct operation of all ultrasonic transducers and tone generators.Deviations from normal operation are stored in the defect code memory.
Diagnosis takes place via the I-bus.
The park distance control system basically consists of following components:
PDC control unit
4 ultrasonic transducers in rear bumper
Rear tone generator (loudspeaker)
4 ultrasonic transducers in front bumper
Front tone generator (BC gong)
PDC button
Switch-on conditions:
Pressing the PDC button or
Engaging reverse gear
Switch-off conditions:
Pressing the PDC button or
Switching off the ignition or
After covering a distance of approx. 55 m or
After a speed of 35 km/h has been exceeded
The rear transducers are deactivated when pulling a trailer.
The PDC receives information via the I-bus as to whether reverse gear is engaged or whether a trailer is to be pulled.
When the system is activated, the indicator lamp in the PDC button lights up.It goes out when the system is switched off.
If there is a fault in the system it is indicated to the driver when he attempts to activate the PDC by the indicator lamp flashing and - when the PDC button is depressed - by a continuous tone.The system can then not be switched on.
Components
Ultrasonic transducer
The transducers operate as transmitters and receivers.
The maximum measuring range is limited:
Rear centre transducers: 20 - 150 cm
Rear corner transducers: 20 - 60 cm
Front centre transducers: 20 - 70 cm
Front corner transducers: 20 - 60 cm
If the minimum detectable distance increases impermissibly, this situation is stored as a defect code in the defect code memory. It may be attributed to dirt accumulation, wet conditions, ice, snow.Before starting extensive troubleshooting, take care to ensure that the transducers are fitted correctly in their retaining fixtures and are clear of dirt etc.
PDC button
The park distance control can be switched on and off manually with the PDC button.
When active, an indicator lamp integrated in the switch lights as a function indicator.
The lamp flashes if a transducer or tone generator is defective.
Front tone generator
The BC gong serves as the front tone generator.
It is connected to the PDC by means of a line link.
Rear tone generator
A loudspeaker which is driven by a certain frequency serves as the rear tone generator.
It is connected to the PDC by means of a line link.
System-related features
Despite the PDC, estimating obstacles is still the responsibility of the driver particularly when detection of obstacles reaches the physical limits of ultrasonic measurement.
Despite optimum preconditions, system-related problems may still occur.It is possible, for instance, that a non-existant obstacle is signalled or a real obstacle is not signalled.
In unfavourable cases, it is possible that the PDC signals a non-existant obstacle in following situations:
During heavy rain
In the case of extreme dirt accumulation, icing on the transducers or if they are covered with snow.
Ground echos on rough road surfaces, grass
In large closed rectangular rooms with smooth walls (e.g. underground car-parks)
If the transducers are not fitted correctly in their retaining fixtures, if they are dirty or iced up
In unfavourable cases it is possible that the PDC does not detect an obstacle in following situations:
Low obstacles with corners and sharp edges
If the car is driven alongside a wall when parking the acoustic signal is switched off for this period of time, also if the vehicle approaches an obstacle - located further away - at a different angle.
If the obstacle is located exactly between two transducers.
Park distance control (PDC)
The park distance control assists the driver when parking and manoeuvring and helps to avoid damage to the car when parking into tight spaces or at blind spots.
The system monitors the distance between the car and an obstacle on the basis of the ultrasonic echo sounder method.
For this purpose, there are 4 ultrasonic transducers integrated in the front and rear bumpers, thus making it possible to monitor the area in front and behind the vehicle.
The control unit cyclically measures the distances between each transducer and any obstacle.
The distance between the car and the nearest object is signalled proportionally to the driver as he approaches it by way of the corresponding tone generator (front or rear).The less the distance to the obstacle, the faster the tone sequence.A distance of below 20 cm is indicated by a continuous tone.In order to distinguish between them, the tone pitch at the front and at the rear differs.
In order to avoid a long persistent continuous tone, the acoustic signal is switched off when driving alongside a wall.However, the distance warning is reactivated if the car continues to approach the obstacle.
The electronic control unit monitors correct operation of all ultrasonic transducers and tone generators.Deviations from normal operation are stored in the defect code memory.
Diagnosis takes place via the I-bus.
The park distance control system basically consists of following components:
PDC control unit
4 ultrasonic transducers in rear bumper
Rear tone generator (loudspeaker)
4 ultrasonic transducers in front bumper
Front tone generator (BC gong)
PDC button
Switch-on conditions:
Pressing the PDC button or
Engaging reverse gear
Switch-off conditions:
Pressing the PDC button or
Switching off the ignition or
After covering a distance of approx. 55 m or
After a speed of 35 km/h has been exceeded
The rear transducers are deactivated when pulling a trailer.
The PDC receives information via the I-bus as to whether reverse gear is engaged or whether a trailer is to be pulled.
When the system is activated, the indicator lamp in the PDC button lights up.It goes out when the system is switched off.
If there is a fault in the system it is indicated to the driver when he attempts to activate the PDC by the indicator lamp flashing and - when the PDC button is depressed - by a continuous tone.The system can then not be switched on.
Components
Ultrasonic transducer
The transducers operate as transmitters and receivers.
The maximum measuring range is limited:
Rear centre transducers: 20 - 150 cm
Rear corner transducers: 20 - 60 cm
Front centre transducers: 20 - 70 cm
Front corner transducers: 20 - 60 cm
If the minimum detectable distance increases impermissibly, this situation is stored as a defect code in the defect code memory. It may be attributed to dirt accumulation, wet conditions, ice, snow.Before starting extensive troubleshooting, take care to ensure that the transducers are fitted correctly in their retaining fixtures and are clear of dirt etc.
PDC button
The park distance control can be switched on and off manually with the PDC button.
When active, an indicator lamp integrated in the switch lights as a function indicator.
The lamp flashes if a transducer or tone generator is defective.
Front tone generator
The BC gong serves as the front tone generator.
It is connected to the PDC by means of a line link.
Rear tone generator
A loudspeaker which is driven by a certain frequency serves as the rear tone generator.
It is connected to the PDC by means of a line link.
System-related features
Despite the PDC, estimating obstacles is still the responsibility of the driver particularly when detection of obstacles reaches the physical limits of ultrasonic measurement.
Despite optimum preconditions, system-related problems may still occur.It is possible, for instance, that a non-existant obstacle is signalled or a real obstacle is not signalled.
In unfavourable cases, it is possible that the PDC signals a non-existant obstacle in following situations:
During heavy rain
In the case of extreme dirt accumulation, icing on the transducers or if they are covered with snow.
Ground echos on rough road surfaces, grass
In large closed rectangular rooms with smooth walls (e.g. underground car-parks)
If the transducers are not fitted correctly in their retaining fixtures, if they are dirty or iced up
In unfavourable cases it is possible that the PDC does not detect an obstacle in following situations:
Low obstacles with corners and sharp edges
If the car is driven alongside a wall when parking the acoustic signal is switched off for this period of time, also if the vehicle approaches an obstacle - located further away - at a different angle.
If the obstacle is located exactly between two transducers.
bimmerholic
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So it's a loudspeaker of it's own...and not twin sharing with the interior car speakers....hmmmm
Extract fro BMW WDS,
As you can see fro the wiring of the speaker from the radio, The left and right have independent output. However, the right speaker are wired in series for the right and left speaker respectively. Hence, if the connection is loose on the right speakers, then both right speaker are affected. Optional input from the telephone module can be connect to the radio as shown.
Pertaining to the PDC,
below show the connection to the ultrasonic sensors to the PDC controller.
Based on the ultrasonic sensors detection, sound is generated from PDC controller to the speaker.
I cant seem to find any connection from the radio to the PDC speakers.
and looking at the picture of the speaker for the PDC, it sure dont look like a normal speaker for the radio.
As you can see fro the wiring of the speaker from the radio, The left and right have independent output. However, the right speaker are wired in series for the right and left speaker respectively. Hence, if the connection is loose on the right speakers, then both right speaker are affected. Optional input from the telephone module can be connect to the radio as shown.
Pertaining to the PDC,
below show the connection to the ultrasonic sensors to the PDC controller.
Based on the ultrasonic sensors detection, sound is generated from PDC controller to the speaker.
I cant seem to find any connection from the radio to the PDC speakers.
and looking at the picture of the speaker for the PDC, it sure dont look like a normal speaker for the radio.
my PDC is not working and how do i hunt down the broken transducer?
perhaps there are more than one broken transducers.
Should i just go and buy one transducer and try it out one by one?
are the side transducer different from the middle one as i read from the thread above that they have diferent range of distance.
anyone has this experiences to share?
thanks.
perhaps there are more than one broken transducers.
Should i just go and buy one transducer and try it out one by one?
are the side transducer different from the middle one as i read from the thread above that they have diferent range of distance.
anyone has this experiences to share?
thanks.
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