Errors on my viggen

[geoff 9-3]

I retrofitted parking sensors and tpms about 3 years ago and they worked fine.

Now I’ve got 4 errors 1 no
communication with CD player in the boot. 2 no communication with the rear parking sensors control unit. 3 no communication with the tyre pressure control unit. 4 no communication with the convertible roof control unit. This was shown using tech 2.

[GeoffR]

Sounds like a discontinuity on the data bus.

[geoff 9-3]

what is the data bus?

[GeoffR]

All the electronic units in your car are connected to each other by digital data bus so that they can share information. Normally* this is just a pair of wires twisted together, known as a twisted pair, that run between the units. It is all described rather well in the 9-5 handbook and probably in that for the 9-3 as well.When you get the No Communication message it is because there is no data on the bus from those units. This may be because either they aren't powered or the bus isn't connected. Given that you have four units not communication the most likely reason is that the bus is disrupted in some way. Start by locating the units and checking the connectors.

*The 9-3 used fibre optics I believe so it is a very real possibility that the problem is with that loop.

[geoff 9-3]

Thank you
Where would the best place be to look? Around where the ecu is?

Regards
Geoff


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[GeoffR]

Thank you
Where would the best place be to look? Around where the ecu is?

Regards
Geoff

I would start at the various ECUs mentioned and then at the others and along the wire bundles for damaged insulation. Do you have WIS? If not I would recommend getting a copy, it is invaluable in tracing this kind of fault.

[geoff 9-3]

I've got wis but it won't run on my windows 7.

[GeoffR]

I've got wis but it won't run on my windows 7.

I think you are going to find the job very hard without WIS, there is too much to PDF and even that won't get you through troubleshooting.

[geoff 9-3]

i'm downloading wis that will run with windows 7.

[GeoffR]

i'm downloading wis that will run with windows 7.

Once you have it running you should be able to find diagnostics bus diagrams, they show some connectors, that is where I would be looking.