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My friend's car (2006 auto) does not enter Accessory mode and I get no DIC message "ACCESSORY MODE ON" after minimum 5 sec press on the lower start button .
Only a short messsage " No Fob detected" while I am pressing the start button .
Nothing happens besides clicking in the relay 42 in engine bay when activating the start/stop button
When I try to talk to the BCM,ECM,TCM with my Tech 2 or my SnapOn scanner both get no communication will these modules so I think this is due to they are not powered up.for some reason .
.
Communcation with RCDLR or door/seat mdules on thw low speed serial bus works fine .
On the schematics below it seems lik the BCM is powering up these highspeed modules through term C1:22 .
Or is it maybe C1:C that supplying these modules with power .
All fuses in engine bay and passenger footwell seems to be ok.
Does anyone know which outputs from BCM shall be energized when the start button is pressed for min 5 sec into accessory mode ?
Can my friends BCM dead and need replacement ?
If anyone with C6 knowledge on this issue I will appreciate any input on whe to check/look
Hey O !!...I don't know if you have a breakout box but check pins 6 and 14 on the DLC for 60 ohms and not 120 or more...disconnect the battery first...check the CAN lines at 6 and 14 too with your scope...you should see CAN hi go from 2.5 to 3.5 volts and CAN low from 2.5 volts to 1.5 volts...see if the waveforms mirror each other...you normally have to use the microsecond time base...very fast signal.
Yes . I have this breakoutbox and I measured these CANBUS Low and High signals on my daughters Volkswagen (for fun) last years so I am a bit familiar with these signals .
I can do these measurements on my friends C6 .
I do not understand why I not can communicate with the BCM , but if the High speed LAN is down maybe the BCM is affected if the scanner user canbus com with the BCM instead of serial com
I’d also check the serial data bus also…pin 2…can’t remember if it’s 0-5 or 0-7 volt square wave on a C6….this may come down to disconnecting modules and jumping across those CAN lines on each module to diagnose this.
I’d also check the serial data bus also…can’t remember if it’s 0-5 or 0-7 volt square wave on a C6….this may come down to disconnecting modules and jumping across those CAN lines on each module to diagnose this.
Is there any C6 guru out there who can confirm that when you activate the Accessory mode pressing lower part of ingnitionswitch more then 5 sec then the BCM (C1:22) will give out 12 volt to supply ECM/BCM/TCM as shown on the schematics below ?
I have to be in accessory mode (short press on the lower start switch) or ignition/on mode (long press on the lower start switch) to see anything on the CAN bus (ECM, BCM, EBCM) with my Tech 2. In just-got-in-the-car mode, only Class 2 modules like the RDCLR, HVAC, etc. are visible.
No units on the canbus is availabe to the scanner , but all unit on the class 2 serial bus are available .
As far as I know the BCM is master of the canbus and I have to measure with my scope and multimeter:
Ignition OFF : approx 60 ohm between Can Low and Can High (Due to one 120 ohm resistors in each end of the can bus lines .
Ignition ON: 2.5 volt between CAN low and Ground
My big problem is that I get no ignition ON ( no accessory volt) when using the button .
I will report back when I have done these measurement and verified the BCM voltage feedings , may one is missing and causing the BCM to stop working
No units on the canbus is availabe to the scanner , but all unit on the class 2 serial bus are available.
In my experience that is normal when not in accessory mode or ignition-on mode.
Until you can get the car in accessory mode or ignition-on mode, you won't see stuff on the CAN bus. If I'm understanding your symptoms, it seems like you have a fob/RDCLR problem to address first.
In my experience that is normal when not in accessory mode or ignition-on mode.
Until you can get the car in accessory mode or ignition-on mode, you won't see stuff on the CAN bus. If I'm understanding your symptoms, it seems like you have a fob/RDCLR problem to address first.
If your correct a non function RDCLR module will prevent accessory mode to me
Could a lack off Ignition 1 voltage from the RCDLR term C1:C stop a Accessory voltage from the BCM and secondly a non operating canbus between high speed modules ?
If your correct a non function RDCLR module will prevent accessory mode to me
Could a lack off Ignition 1 voltage from the RCDLR term C1:C stop a Accessory voltage from the BCM and secondly a non operating canbus between high speed modules ?
O, you can try taking a fused jumper to terminal C of the RCDLR or at the BCM and see what happens.
I wil check this out on monday when I will be troubleshooting further .
I think I put my words wrong with this question "Between RCDLR term C1:C and BCM term C4:C8 ?"
The BCM need to see battery voltage on the C4:C8 term. If the RCDLR is not providing a 12volt , my suggestion is a bit brain dead
I will try a fused jumper from the battery directly to C4:C8 on the BCM and see if I will be able to activate ACCESSORY MODE using the button.
If so happens and the canbus com is working my enemy to fight is the RCDLR module .
We have a spare unit I can program with my TIS2000 software on my laptop if needed .
Have only done reprogramming of my C5 PCM unit and the Thefte relearn
I will report back after monday
Problem is no fobs programmed into the RCDLR, it not going to allow the car to go into any mode.
So either TIS2000, or TDS, go into RCDLR module in that module select screen in either, and put the RCDLR into relearn mode.
Going to get a 3-10min count downs in the DIC, and when the count down gets to zero each time, press the starter button down side, to start the next count down. Once you are done with the third 10 min count down, RCDLR will be in Fob relearn mode, and can program a fobs in now.
Myself,will just program in the first fob that way, to allow the car to now go into other modes, and then using Tech2win to program in the last of the fobs.
And next time, use Tech2win to do the fob erases, then program in the fobs using Tech2 win at the same time, while the BCM is still in either ACC mode, or Run mode with the motor off (just hold down the starter button on the bottom side for 5 seconds to get into the later mode). Hence problem is the BCM, and when you put the car back into off mode, RCDLR is not going to allow it to come out of that mod (short of setting the RCDLR back into relearn mode, so fobs can be programmed into it again).
Simply put, BCM is asking the RCDLR if can see a programmed fob to it when you press the starter button, it answers back no (since no fobs are programmed into it), and the BCM is not going come out of Stop mode because of this. So have to program a fob back into the RCDLR, via putting the RCDLR into relearn mode via either TIS200, or TDS.
As for which to use, if car BCM is set to USA for country of use, TDS every time, since TIS2000 is always going to require the 30 min count down/three starter pushes to get it back into count down mode, while TDS relearn method, no count downs.
Abound models, going to have the three 10 min count downs with either software used.
Simply put, BCM is asking the RCDLR if can see a programmed fob to it when you press the starter button, it answers back no (since no fobs are programmed into it), and the BCM is not going come out of Stop mode because of this. So have to program a fob back into the RCDLR, via putting the RCDLR into relearn mode via either TIS200, or TDS.
As for which to use, if car BCM is set to USA for country of use, TDS every time, since TIS2000 is always going to require the 30 min count down/three starter pushes to get it back into count down mode, while TDS relearn method, no count downs.
Abound models, going to have the three 10 min count downs with either software used.
Thanks for your PM reply , very much appreciated
The car is a US car imported to Norway a few years ago.
I will do the TDS programming with TIS2000 tomorrow and report back .
Tis2000 has the 30 min window (three 10 min count downs) on both usa and exported cars.
As for once you get a fob programmed in and put the car into ACC mode, using Tech2win to go into BCM set up, and check to see what country of use the BCM is set up to. If set to USA still, then TDS is the better program, since it will not have the 3-10min count downs before you can program a Fob into the RCDLR once set into relearn mode.
When I have Tech2 connect to my laptop and the car and then start the SPS part of TIS2000 program I get this communication errormessage .
I know the RCDLR is communicating along the singleline serial bus(working using Tech2) and the BCM,TCM,ECM and EBCM using the highspeed CANBUS.
To me it looks like SPS is trying to use the Canbus com to communicate with the RCDLR modul, but this communication will not work until Accessory mode(Igntion mode) is enabled bye the BCM .
Is it any change in settings needed to tell TIS2000/SPS to communicate with the serial databus so I can program the RCDLR into learning mode ?
When I use Tech2 standalone I can view RCDL data
When I choose Setup New RCDLR under keyless data I get this com error .
I a way similar to the SPS respons
2006 Auto does not enter Accessorry mode
