Question about Volkswagen Passat

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Could the immobliser or instrument cluster cause vcds not to communicate with abs airbag and steering resistance between can bus cables at ecu and abs is about 10 ohms----------------resistance at 16 pin connector is about 65 ohms

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  • joethemull May 20, 2011

    will i send you an auto scan of the car?

  • joethemull May 25, 2011

    i connected a twisted pair direct from gateway to engine ecu and car started so fault is in the powertrain can bus

  • joethemull May 25, 2011

    yes-----solution was helpful

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  • Volkswagen Master
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Yes faulty immobilizer or instrument cluster can cause many such problems.But both are to be checked.A short in the cluster board or loose connection in immobilizer connections .Or a loose wire or any wire pinched and got cut in between can cause such problems. ----- Thanks.Helpmech.

Posted on May 20, 2011

  • raj somaiya May 20, 2011

    Yes you can post the auto scan of your car , in the comment.
    -------
    thanks.Helpmech.

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How turn off no bus in my pt cruiser 2001


Hello, it means that the instrument cluster is not seeing messages from the PCI bus, which is how it communicates with the other modules on the vehicle, if you're not having any other problems it's unlikely that the communication bus has failed. You most likely have either a broken bus wire going to the instrument cluster or a failed instrument cluster itself. If you are having other related problems you're either going to have a failed module corrupting the communications bus, or a grounded or shorted bus wire, which will also cause the bus to fail. These are probably the hardest to diagnose problems we see on these vehicles.

The first thing you'd need to do is using a DRB3 scan tool do a module scan to determine if the pci bus is operational. If it is you can then focus on the instrument cluster. If it's not you'll then need to check for shorts to ground and voltage on the pci bus wire, if either is present you'll need to find the cause of the fault.
006 Chrysler PCI Communications

May 28, 2017 | Cars & Trucks

1 Answer

On my 05 Ford mustang v6, my fan only comes on when i turn my AC on and makes a funny noise when I turn the AC on, diagnostic test gave me a code, u1900, what does this mean and how do I fix it?


Where did you pull this code from ? What type scan tool did you use ,or was it a code reader ? Do you know about data communication networks on modern cars ? A U codes indicate a communication problem on the data network .
U1900 CAN Communication Bus Fault-Receive Error Audio Control Module REFER to Section 418-00 . U1900 CAN Communication Bus Fault-Receive Error ABS Module REFER to Section 418-00 . U1900 CAN Communication Bus Fault-Receive Error Instrument Cluster REFER to Section 418-00 . U1900 CAN Communication Bus Fault-Receive Error SJB REFER to Section 418-00 . The thing that would make this easier to diagnose would be to have a factory scan tool or a professional grade . Need to know what modules can communicate with scan tool .Honestly ,Don't think you can fix this . Dealer or ASE certified repair shop .Do you know what C.A.N. - controller area network is ? The vehicle has 3 module communications networks:
  • high speed controller area network (CAN)
  • medium speed CAN
  • international standards organization (ISO) 9141 communications network
The diagnostic tool connects to the communications networks through the data link connector (DLC). The DLC allows a diagnostic tool access to diagnose and test the vehicle systems of any module on the communications networks.
All 3 communications networks are connected to the DLC. This makes diagnosis and testing of these systems easier by allowing one diagnostic tool to be able to diagnose and control any module on the 3 communications networks from one common connector. The DLC can be found under the instrument panel between the steering column and the driver door. Which module doesn't communicate with scan tool ?
Symptom Chart Condition Possible Sources Action
  • The anti-lock brake system (ABS) module does not respond to the diagnostic tool
  • Circuit or connection in the high speed controller area network (CAN)
  • ABS module
  • Go To Pinpoint Test A .
  • The audio unit does not respond to the diagnostic tool
  • Circuit or connection in the medium speed controller area network (CAN)
  • Audio unit
  • Go To Pinpoint Test B .
  • Circuit or connection in the medium speed controller area network (CAN)
  • Audio unit
  • Go To Pinpoint Test B .
  • The instrument cluster does not respond to the diagnostic tool - high speed controller area network (CAN)
  • Circuit or connection in the high speed CAN
  • Instrument cluster
  • Go To Pinpoint Test C .
  • The instrument cluster does not respond to the diagnostic tool - medium speed controller area network (CAN)
  • Circuit or connection in the medium speed CAN
  • Instrument cluster
  • Go To Pinpoint Test D .
  • The powertrain control module (PCM) does not respond to the diagnostic tool
  • Circuit or connection in the high speed controller area network (CAN)
  • PCM
  • Go To Pinpoint Test E .
  • The restraint control module (RCM) does not respond to the diagnostic tool
  • Circuit or connection in the international standards organization (ISO) 9141 communications network
  • RCM
  • Go To Pinpoint Test I .
  • The smart junction box (SJB) does not respond to the diagnostic tool
  • Circuit or connection in the medium speed controller area network (CAN)
  • SJB
  • Go To Pinpoint Test F .
  • No high speed controller area network (CAN) communication
  • Circuit or connection in the high speed CAN
  • High speed CAN modules
  • Go To Pinpoint Test G .
  • No medium speed controller area network (CAN) communication
  • Circuit or connection in the medium speed CAN
  • Medium speed CAN modules
  • Go To Pinpoint Test H .
  • No international standards organization (ISO) 9141 communications network communication
  • Circuit or connection in the ISO 9141 communications network circuit
  • Restraint control module (RCM)
  • Go To Pinpoint Test I .
  • No module/network communication - no power to the diagnostic tool
  • Data link connector (DLC) C251
  • Bussed electrical center (BEC) fuse 4 (30A)
  • Smart junction box (SJB) fuse 8 (10A)
  • Circuitry
  • Diagnostic tool
  • Go To Pinpoint Test J .

Apr 11, 2016 | Ford Cars & Trucks

1 Answer

Looking for wire for heater gage temperature


Depending on the year there isn't any . All done by computer on serial data bus communication network. The coolant temp. is supplied to the engine computer By a ETC - engine coolant temp sensor . All the modules on the vehicle ( ABS , air bags , BCM , instrument cluster , RKE module etc... ) Share info on this data bus network . If the gauge isn't working probably bad ,If a communication network problem the gauge will default to fixed temp degree . This is for a 1999 Buick , out of factory service repair manual . But all vehicles are pretty much the same .
Engine Coolant Temperature Gauge
The Powertrain Control Module (PCM) via the class II serial data line to the instrument cluster, broadcasts the coolant temperature. The instrument cluster compares the temperature data using a 16 point look-up table in order to determine the needle deflection. A smooth filter is used in order to secure a continuous response. The instrument cluster drives the temperature gauge to C (cold) under the following conditions:
• The temperature data is lost.
• The PCM is in a state of health fault.

Mar 09, 2016 | Cars & Trucks

1 Answer

1997 olds gutless. Fuel gauge stuck past full. How to reset


Need to replace the instrument cluster or fuel gauge sending unit in the fuel tank or there is a BCM problem .BCM is a computer module if your not familiar with that . The BCM controls the instrument cluster indicators through the SPI serial data communication bus. Refer to Body Control Module System Check in Body Control System.
Serial Peripheral Interface (SPI) Data Line
The serial peripheral interface (SPI) is a three wire interface connecting the BCM to the instrument cluster. The SPI allows for the exchange of information. This interface is a synchronous serial data link where the BCM is the master and the instrument cluster is the slave. Because of the need for modules on the different serial data links to communicate with each other, the BCM acts as an interpreter, or master, for data communication between the class 2 and SPI data lines.
Driver Warning System
The BCM is responsible for the following functions:
  1. Interpreting all of the driver warnings sent by the control modules on the class 2 serial data line
  2. Sending the information to the instrument cluster in the form of a SPI serial data bus message
The following list of messages are sent by the BCM to the instrument cluster:
?€¢
Fuel gauge position


?€¢
Temperature gauge position


?€¢
Oil pressure


?€¢
Low engine coolant


?€¢
Check oil


?€¢
Volts


?€¢
ABS


?€¢
High beam


?€¢
Low fuel


?€¢
High temperature


?€¢
Washer fluid level low


?€¢
CRUISE


?€¢
BRAKE


?€¢
SERVICE VEHICLE SOON


?€¢
Door ajar


?€¢
Seat belt


?€¢
THEFT SYSTEM


?€¢
PRNDL


your best bet is to take your vehicle to a ASE certified repair shop an have it diagnosed .

Mar 02, 2016 | Cars & Trucks

1 Answer

2008. Where is horn relay located?


There isn't one ,controlled by the totally integrated power module , computer . Horn not working , could be the clock spring inside steering column . google automotive clock spring . Does your radio controls on the steering wheel work ,if you have them . Is the airbag light lit ? When you push the horn switch on the steering wheel ,it is an input to the instrument cluster microprocessor . The instrument cluster is on the C.A.N. data bus ,when horn input is sensed it sends a message to the TIPM which then turns on the horns . all electronically controlled . How to Diagnose Controller Area Network CAN

Nov 26, 2015 | Chrysler Sebring Cars & Trucks

1 Answer

I have multiple codes instrument cluster codes: u1073, u1262, u1059, u1123, u1041; ABS/TCS codes: u1073, u1262, C1805, B2900;


Did you change any modules on the vehicle ?
B2900 VIN Mismatched ABS Module VERIFY that the module has the correct as-built data.
CHECK for correct powertrain control module (PCM) and ABS module configuration using the diagnostic tool. RECONFIGURE the component as necessary. FOLLOW the diagnostic tool directions for the ABS module configuration or REFER to Section 303-01A or Section 303-01B for the PCM. CLEAR the DTC. REPEAT the C1805 Mismatched PCM and/or ABS/TC Module ABS Module CHECK for correct PCM and ABS module configuration using the diagnostic tool. RECONFIGURE the component as necessary. FOLLOW the diagnostic tool directions for the ABS module configuration or REFER to Section 303-01A or Section 303-01B for the PCM. CLEAR the DTC. REPEAT the self-test. U1073 SCP (J1850) Invalid or Missing Data for Engine Coolant PCM REFER to Powertrain Control/Emissions Diagnosis (PC/ED) manual. U1262 SCP (J1850) Communication Bus Fault Network Fault REFER to Section 418-00 . Can a scan tool communicate with all the modules on the vehicle ?
  • The anti-lock brake system (ABS) module or stability assist module (if equipped) does not respond to the diagnostic tool
  • Circuit or connection in the standard corporate protocol (SCP) network.
  • ABS module.
  • Go To Pinpoint Test A .
U1123 Invalid or Missing Data For Odometer Instrument Cluster Go To Pinpoint Test G . U1059 SCP (J1850) Invalid or Missing Data for Transmission/Transaxle/PRNDL PCM REFER to Powertrain Control/Emissions Diagnosis (PC/ED) manual. U1041 SCP (J1850) Invalid Or Missing Data For Vehicle Speed Instrument Cluster REFER to Section 413-01 . U1041 SCP (J1850) Invalid Or Missing Data For Vehicle Speed Tire Pressure Monitoring System Module REFER to Section 204-04 . You need to take it to the dealer , not a transmission shop. Your vehicle could have a ground issue , could have power issue , could have a control module issue . It needs to be hooked up to the factory scan tool ! It is for sure it has a communication problem on the SCP data bus , do you know what serial data communication is ?
The vehicle has 3 module communication networks:
  • the standard corporate protocol (SCP) communications network
  • the international standards organization (ISO) 9141 communications network
  • the universal asynchronous receiver-transmitter (UART) based protocol (UBP) communications network
The diagnostic tool connects to all 3 networks through the data link connector (DLC). This makes diagnosis and testing of these systems easier by allowing one diagnostic tester to be able to diagnose and control any module on the 3 networks from one connector. The DLC can be found under the instrument panel between the steering column and the radio.
The SCP communications network will remain operational even with the severing of one of the bus wires. Communications will also continue if one of the bus wires is shorted to ground or voltage, or if some but not all termination resistors are lost. The SCP communications network allows inter-module communication.
The ISO 9141 communications network does not permit intermodule communication. When the diagnostic tool communicates to modules on the ISO 9141 communication network, the diagnostic tool must request all information, or initiate module commands.
The ISO 9141 communications network will not function if the wire is shorted to ground or battery voltage. Also, if one of the modules on the ISO 9141 communications network loses power or shorts internally, communications to that module will fail.
The UBP communications network will not function if the wire is shorted to ground or voltage. The UBP is different from the ISO communication network in that it allows intermodule communication.

Sep 13, 2015 | 2004 Lincoln Aviator

1 Answer

I have 08 ford escape when I try to scan it said no communication


Do you know about communication networks or serial data communications on vehicles , these let the scan tool communicate with the different modules on the vehicle ! Newer vehicles have several, PCM - powertrain control module , Anti-theft module , Air bags , antilock brakes , Body control module or in the case of ford a smart junction box . an some others !
Communications Network Vehicle communication utilizes both International Standards Organization (ISO) 9141 and controller area network (CAN) communications. ISO 9141 is used for diagnostic use only, and CAN is used for many modules to communicate with each other on a common network. CAN in-vehicle networking, is a method for transferring data among distributed electronic modules via a serial data bus. Without serial networking, intermodule communication requires dedicated, point to point wiring resulting in bulky, expensive, complex, and difficult to install wiring harnesses. Applying a serial data network reduces the number of wires combining the signals on a single network. Information is sent to the individual control modules that control each function.
The vehicle has 3 module communication networks:
  • ISO 9141
  • Medium speed (MS) CAN
  • High speed (HS) CAN
All 3 networks are connected to the data link connector (DLC). This makes diagnosis and testing of these systems easier by allowing one scan tool to be able to diagnose and control any module on the 3 networks from one connector. The DLC can be found under the instrument panel between the steering column and the audio unit.
HS-CAN Network Operation
The HS-CAN network communicates using bussed messages. The HS-CAN network uses an unshielded twisted pair cable, data bus (+) and data bus (-) circuits. In addition to scan tool communication, this network allows sharing of information between all modules on the network.
The HS-CAN is a high speed communication network used for the following modules:
  • ABS module
  • 4WD control module (if equipped)
  • Instrument cluster
  • PCM
  • MS-CAN Network Operation
    The MS-CAN network communicates using bussed messages. The MS-CAN has an unshielded twisted pair cable, data bus (+) and data bus (-) circuits. In addition to scan tool communication, this network allows sharing of information between all modules on the network.
    The MS-CAN is a medium speed communication network used for the following modules:
    • Instrument cluster
    • SJB
    HS-CAN Network
  • What type of scan tool are you using ? or are you using a code reader ?

  • What
Computer No Communication Troubleshooting by Wells Saturn Toyota Echo No Communication Case Study

Mar 18, 2015 | 2008 Ford Escape

1 Answer

Ecu seem to be faulty it will communicate DTC code and read and clear them but no link error if you try and read airbag power steering abs code scanner work fine on another car


Year make and model helps. But here you go. Either it is a bad fuse for the ABS, Steering , and airbag. Or you have lost a data wire/connection to those components. If you have an older car it could be possible you just don't have those components in the car.

Mar 13, 2015 | Cars & Trucks

1 Answer

Hi I would like to know how would I go about adjusting my 1999 polo playa 1.6i clutch cause it is to high can any1 help thanks 4 your advise


'Volkswagen Polo 1.9TDi 74KW, 2006 model sedan. Instrument cluster will reset, all lights come on sometimes with a loud beep sometimes with the horn also. It started first when I turn steering wheel to max either side then the airbag light will come on and I will loose power steering, then when switch off and restart all is fine but all counters are reset on the instrument cluster. Most recent incident when I was driving on highway and slacking off to take an exit then all the lights on dash was lit, lost power steering and loud beeping and I switched off engine and restarted (while freeing at high speed) then all OK again. Seems to happen more frequently but intermittent.' - has been answered - "'I had the same problem after I had my car serviced, the problem with the power steering was that the signal to the power steering pump was set to high and the pump cut out because it was receiving an incorrect signal, the instruments reseting was found that alot of the ground wires was loose, for some reason the abs sensor was also not adjusted correctly which made the abs light come on as well. I took the car to another service centre and they adjusted the abs sensor and the signal to the pump and checked all my wirring - had no problems since - Christiaan from South Africa'"

BMW ACCESSORIES.

May 31, 2012 | 1995 Volkswagen Polo 1.4

1 Answer

Odometer has warning code what is it no bus5


The bus is the communication interface between the many modules or computers on your vehicle. The engine and transmission modules need to be able to communicate with the cluster as well as the airbag, antilock brakes, and body control module to turn certain lights on and make gauges function. "No bus" means the communication line is either open or shorted and the cluster can't determine the inputs from the other modules. Any given module on the vehicle can pull the bus down as well as wiring. It is most likely a module causing the problem. One way to find the culprit is to disconnect each module with the key on until the odometer comes back to life. If it starts and runs, drives and shifts normal, I would do the engine and transmission last. I would start with the ABS and overhead console (if it has one). I hope this helps.

Oct 04, 2009 | 2004 Chrysler Sebring

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