Ford C-Max EU 2017: No sounds (chimes) from the parking sensors and parking assist. Original Sync3, version 3.4 installed

Bonzo · 6 September 2025 22:13

The problem is that when using the parking sensors and automatic parking assist, there are no warning sounds. I should add that the on-screen information graphics work perfectly. The problem is so complex that some audible notifications do occur.

For example, when approaching an obstacle, the increasing sounds (green and yellow areas on the graphics) are missing. Note that the radio volume mutes at these moments! However, when the red area appears, the warning sound comes on. It’s so delayed that it only appears after I stop the car. The radio volume also mutes, but when I disengage reverse gear, I hear a static noise in the speakers, and the radio briefly switches to a different station than the one I was listening to, then returns to the correct station – strange.

However, when using Active Parking Assist, I miss the chime when a space is found. However, during automatic parking, the chimes appear when I have to stop and shift into forward or reverse gear. However, they are also delayed, and the graphic displays the gear change information before the audible feedback.

Before I decided to write to you, I searched for a solution myself. Unfortunately, nothing I found here or on other forums helped.

I tried changing the options in APMI 7D0-01-01, PAM 736-05-01, and changing the options in the IPC, although what’s in the database doesn’t match my car (it seems the Ford C-Max 2017 EU has the Focus RS (2016-2019) IPC database, but instead of the 726-01-01 prefix, it has 720-01-01). I also searched for settings in the BCM and changed the chime settings, but that didn’t help either.

The only thing I could try was changing the settings in the ACM. However, there’s a problem because I have a new ACM, and the only data displayed after reading the module is 727-01-01 0030. Ford’s As Built stock doesn’t even have any data for 727-XX-XX.

After a long time of trying to figure it out and searching for a solution, I’ve unfortunately given up and need help.

The last thing I can think of is whether I should downgrade the software. I found on the forum that someone stopped receiving speeding warnings after updating to 3.4.23188. I don’t have these warnings either, nor do I have City Alerts. I just don’t know which one. Which one is the most stable and will work with my vehicle?

EDIT:

PS. To post this, I had to go down to the car and generate a log. I only just looked at it carefully. This information in the log caught my attention.

Could this affect the sounds? Please bear with me, as I don’t speak English, so I have to explain everything, and not all the options are clear to me. Should I try to change it again?

SYNC Region: EU

Navigation Variant: Nav

Manufacturer Year: Pre MY20

Install Type: OEM

Old SYNC Version: 3.0.19205

New SYNC Version: 3.4.23188

Do you have a error message, if so what is it?
No

Update Method: CyanLabs Syn3 Updater

Syn3 Updater Version: I don’t know. The previous owner did that.

Syn3 Updater Documentation Read: yes

Syn3 Updater Log File

https://cyanlabs.net/fhub/sync3/apim-asbuilt-decoder/?filename=1757195108.xml

Bonzo · 9 September 2025 20:04

I downgraded to 3.3.19052.

The only difference in the sounds is that sometimes a chime appears near the first green zone on the graphics. However, sometimes it’s there, sometimes it’s not. Sometimes it chimes when I put the car in reverse and something is in the green zone.

Overall, downgrading didn’t help. The problem persists.

To illustrate the settings, here are my IPC, PAM and APMI settings.

Module=7D0 (APIM)

01-01 0968 6592 90D1 
01-02 02FC 1500 02EF 
02-01 474D 0106 40B5 
02-02 0308 0000 00E6 
02-03 0005 E1
03-01 0000 0100 00DC 
04-01 0100 1601 04F8 
04-02 0007 E4
05-01 17A2 1798 286D 
05-02 BE9C 
06-01 805E 
07-01 1503 3300 002A 
07-02 0000 0682 0068 
07-03 0004 3065 007A 
07-04 6446 
08-01 0000 0000 00E0 
08-02 0000 0000 00E1

Module=720 (IPC) This data corresponds to the IPC Focus RS database, 720=726

01-01 F7FF 1F90 CE
02-01 021E 9C1F 0A0F 
02-02 0624 5210 1FD6 
03-01 FFFC 4400 6A
04-01 0704 0302 3C
05-01 0704 0302 3D
06-01 2400 AC03 01
07-01 1E1E 006B 
08-01 0100 0896 CF
09-01 001E 053C 90
10-01 FE36 
11-01 0000 0000 39
12-01 03FF 03DA 031C 
12-02 DA03 FF03 FF19 
12-03 03A2 03FF 01E4 
12-04 FF02 8003 00C1 
12-05 0376 03FF 02BB 
12-06 BC03 2003 84A5 
12-07 03B6 03FF FB
13-01 0403 E801 0530 
13-02 0A0F 141A 20A3 
13-03 2730 3B4A 5D76 
13-04 7DA6 AAAC AF66 
13-05 B1B4 A4
14-01 2814 0064 502C 
14-02 2814 0019 0A9C 
14-03 0064 3219 0AF7 
14-04 003F 
17-01 FFFF FF9F DB
18-01 BFFF 7F3E BB
19-01 FFFF FFFF 3D
20-01 FFFE FFFF 43
21-01 FF5F FFFF A5
22-01 FCFF FFFF 43
23-01 FFF3 FF0F 4B
27-01 E02F 
28-01 FFBF 1900 27
29-01 7F1E 0000 EE
30-01 FFFF 0F00 65
31-01 FFFF 7F00 D6
32-01 F04A 
34-01 1601 0000 73
35-01 FFFF F747 99
36-01 FF03 0000 60

Module=736 (PAM)

01-01 8C45 1549 6E
02-01 4001 0E00 8F
03-01 0000 4318 9C
04-01 0740 2000 A9
05-01 3001 3000 A4

Question
What does this function do?
Should I change it to - enabled?

I changed this option to “F” - nothing improved.
Is it correct that I originally have “0”

Is this set up correctly? This is how it is in the original

&