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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > DIY Guides > DIY: E9X ACC Retrofit



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      04-02-2021, 07:25 AM   #265
hupchye
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Hi aeroshurik,

I see you are very good in coding. And I think there is nothing wrong with your coding.

Possible similar to my E92 320i N46N 4cyl Patrol engine, your E91 318d N47 4cyl Diesel engine may also has compatibility with DCC & ACC.

For my case (4cyl patrol engine), when coded with VO $541, everything works (SZL, cruise speed pointer, cruise speed display, ACC car in front sensing, set distance increase/decrease and DSC braking) EXCEPT cannot hold speed (cruise). No error at all.
I go very deep in order to find out the root of the problem by sniffing the PT-CAN, study CAN Bus ID commands. Finally confirmed is my DME (0x0AA) does not understand the cruise command from LDM (0x193).

I see your case looks more complex than mine. ie: when coded with VO $544, DSC no braking. Error D360 & D362 in DSC. From my experience of CAN Bus ID study, these 2 errors shows DSC does not receive Torque command ID (for braking as well) 0x0AC & 0x0B4 from DDE. The only way to know is by sniffing the PT-CAN using CAN Bus Sniffer. You may refer to my old thread #212 for CAN-Bus Sniffer DIY if you are interested.
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      Yesterday, 08:14 AM   #266
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Edit: Took car on a test drive, ACC worked without error. Not sure why the code presents but system works.

Running into some similar, albeit different issues and wracking my brain. Hopefully someone smarter than I can help out here.

2010 E90 335xi

Retrofitted ACC (added LDM as well), tapped PT-CAN off FRM since I have adaptive headlights.

FA Write to CAS, NFRM, FRM, VO coded to BDSC, LDM, ACC, KOMBI, CIC.

Able to see LDM and ACC modules in NCSExpert when running UIF, no coding errors when writing VO. Presume this indicates PT CAN connections are sufficient.

Modules also appear correctly in ISTA.

When checking codes, receive CD96 - Message (torque request ACC, 0xB7) faulty, receiver DME, transmitter ACC. This also generates a 2DBE, DME: Active Cruise Control blocked for driving cycle.

The only thing I havent done is try to update firmware on the LDM or ACC (WinKFP issues), or conducted an alignment of the ACC. Dont feel its relevant since this appears to be a communication issue, but open to any insights.

Last edited by Broseff; Yesterday at 01:04 PM.. Reason: Discovered reason
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