Wiring preparation:
To take care of the wiring and installation, I had also ordered a Suzuki compatible connector from Aliexpress to break out from the factory harness. I planned to prepare a harness on my own based on the pinouts. I replied to the order confirmation from BP India asking them the wiring material that was provided in the box. To this they replied telling that they would send car specific harness complementary with the HU. This was a good move though I was still curious to see what they would send since I was unsure if they would take care of the Steering control part.
The Aliexpress seller however, didnt send the product according to description. I had ordered an audio connector for Suzuki along with a converter for the antenna. What was sent to me was a Suzuki to ISO audio harness which just had the basic power connections and speaker connections. However, the required signals were more. Here is a list of signals provided by the stock connector of Celerio/SX4:
In the SX4 pin number 12 is unused since the illumination brightness isnt adjustable, while my non VVT SX4 does not provide VSS signal at 18 for speed based volume control. It also does not get a third connection from Steering wheel control at pin 8(more on this later). The USB port, Aux-In, Mic reach the stock HU via dedicated connectors. The pinouts for these are fairly simple. Thankfully, the harness sent by Blaupunkt had whatever was required by their head unit, except the FM antenna.
Unboxing and trial:
The HU came well packed and was sealed. The complimentary harness was packed separately and enclosed in a bigger box. A detailed invoice along with a warranty card came with the package. Inside the box was a load of cables for various connections,
- Head unit to ISO Harness which includes all the power and stock speaker outputs along with parking brake input, reverse input ad
- Steering wheel controls input
- External Mic in with cable
- 3 pairs of Pre-amp outputs along with a trigger for amplifier
- Aux video/audio in, Rear view camera in, power for rear view camera
In addition to this, there is a compact IR Remote with the basic buttons which again is of no use to me. They sent me a converter from the stock coupler to ISO, which had to be plugged into harness #1 above. That will satisify all the basic input requirements. This made the job very easy.
Irrespective of whether we do the wiring ourself or use a ready made adapter or harness, its always good to check if the connections are correct. This is definitely a must for the power connections since there could be two chances, one the HU receiving power on a pin it is not supposed to, and two the vehicle getting return current on a wire it is not supposed to. Its not always safe to assume that the ready made harness is flawless or your manufacturer has not made changes to wiring.
First trials using the faceplates:
SX4: Celerio:
I decided to test the system out in the Celerio so that I can first check out how it is.
Installation in the car:
Installation was pretty simple because there was nothing much to be done other than:
- Remove the silver colored dash trim
- Unscrew AC vents and remove them along with the Hazard warning light switch
- Disconnect coupler for the Hazard switch
- Unscrew the Head unit mounting screws which can be accessed from the opening created by removing AC vents
- Pull out the stock head unit and disconnect coupler
- Remove the mounting brackets from the stock head unit
- Attach the faceplate to the brackets
- Mount the BP head unit onto the bracket and align them flush with the faceplate and screw them in
- This completes the preparation of the BP head unit for fitting it into the dash
- Plug in the harness appropriately to the factory harness and the FM antenna and other connections if applicable
- Insert the HU into the slot and reverse the above steps to put everything back in place
Before screwing everything in place, it will be a good idea to power up the whole setup and just check everything works as expected. At this point of time, I have left many interfaces open.
- Currently using the onboard mic, which seems to be pretty good with calls and Siri as well. Future plan is to mostly use the stock mic inside the car, or use the external mic supplied inside the cabin light assembly. I dont want the external mic sticking out into the cabin in some corner
- Havent used the Aux inputs, and have left the factory aux pin unused. Until now, I have never used it even in the stock HU and hence will not consider connecting it.
Since the USB ports are pigtails from the HU, I have left the mass storage port inside the glove box with a USB stick, while the port for phone is randomly in the passenger footwell(never leave a cable dangling in the driver footwell. I will later connect this to the stock USB port installed in the car and use its functionality and mounting position to be clean and also safe.
Steering wheel controls:
As I mentioned earlier, the Monte carlo is compatible with steering controls. It has a 3.5mm analogue input into the HU to which there is a breakout cable from the stock coupler to the 3.5mm jack. The steering controls are analogue, ie resistance based which differ for each key. The head unit can be programmed to learn the various keys and voila, the setup is done. No need of any adapter and such. Here is a short video which literally takes just a minute to get the controls synced with the car. Wierd thing is that the stock HU uses three pins for the steering controls, while the BP does good with two pins. Not sure what was the logic behind this since two pins are good for varying resistance for various keys.
Steering wheel controls are now setup:
Update:
I ordered a camera from amazon(
https://www.amazon.in/gp/product/B07...?ie=UTF8&psc=1) and installed it. This was one of the better cameras with respect to resolution and lens and came to my hands for Rs. 1.3k. I opted for this design since I did not want to drill the bumper. Wiring for the camera was a little tedious since it runs along the entire length of the car. I do not have pictures of the installation since I do it single handedly and I do not like the idea of touching my phone with greasy hands. Hence, please bear with me for this however if you have any questions then please feel free to ask. Here are some pictures of the output: