Car Solutions Forums

Hello,
I´ve got a Multimedia Video Interface with CAN, Model: QVI – BM09 – Main – V5.4 and the associated rear camera
My car is a BMW E61 with additional installed CIC and a 8,8” CID
In the interface menue I set
Car-Model: E90
Reverse-Signal: Lamp (even at set: CAN no function)
NAVI_Model: Default
DIP-Switch: 7 = ON
The rear camera doesn´t work. It seems that the interface doesn´t switch to the rear camera at reverse gear.
All other functions (AV1 – AV3, I-Drive-operation, menue settings etc.) are working well.
I controlled the wiring and measured the voltages.
- Grey wire of the cam converter-box at reverse gear: 12 V
- Yellow / black wire cam converter-box: no Voltage at reverse gear
Next I set reverse-Signal to “CAN”. – No reaction, back to “Lamp” setting
So I connected 12 V to the Yellow / black wires, now the camera got power at reverse gear, but still no picture at the rear camera input. (The red led at the interface is on. The green led is off)
I tried to feed a (PAL) video signal in the “Rear_C” cvbs-Input at reverse gear. No picture

Can You please answer the following questions, so that I can search out the fault.

1. How does the interface recognize the reverse-signal irrespective of the can-bus?
Is there a separate connection “reverse gear”?
Does the interface switch over to rear-cam automatically by a video-signal input at cvbs “R-Cam”?

2. Is the 12 V voltage constantly at the interface-connector "R- CAM"

3. Are the pins on connector "R-CAM" at pos. no. 2 (red)and no.3 (black) Ok?

4. Does it matter if there’s a PAL or a NTSC-signal at the R-CAM input?

Thanks for answering.

Hello.
1. You need to connect Rear-C wire (grey) to the rear lamp wire according to this wiring diagram.
2. +12V appears when rear gear is on.
3. Should be ok.
4. BMW cars support only one standard PAL or NTSC. Make sure that rear connected source supports the same standard.

Thank You for answering. In the wiring diagramm the relay switches the +12v to the Interface. I don' t have this reverse signal pin at my Interface. How does my Interface know, without can-bus, that it hast to switch to rear-cam?

First of all try to select the model of the car in factory mode->util->car model, for CAN. If it doesn’t help, here is how you can connect it via LAMP:
.
You should connect the wire from the rear lamp to the pin, which is indicated on this picture as Rear-C and select LAMP in factory mode->util->rear select.

Yes!!!! Now it is working. Thanks a lot!