1. Dont buy a replacement from EBAY / Scrapyard etc without checking things first or at least

   1. Buying the Keys for the same CIM 

   2. Having the Security Code for the Car - Usually in the Service Book on a credit card style slip for the ecu your buying.

   3. Buying the OPcom software - £250 plus a laptop to run it.

   4. Expecting it to work by direct replacement --- IT WON'T

2. Dont expect to remove the Column Controller ECU and fit a new one without having it programmed to the Car Keys and Engine Controller.

Go to this site ECU Connection and buy a replacement coded for your car. 

Send them your old one and they send you a replacement coded to your Car. Great service and good communications, I used them and all worked out great.

SOUND:

If you've losts sounds, e.g the sounder for Indicators, Seat Belt, Lights on, Front sensors, Keys In, etc and all else works, it's likely the CIM sounder- NO ALTERNATIVE BUT FULL REPLACEMENT!  see below.

If the HORN isnt work you might get lucky checking continuity and working through the below checks. This is wired through the CIM, not controlled by it.

AIRBAG and Steering Wheel Controls , again you may get lucky after checking continuity, it may not be the CIM, as the wiring passes through it.  

First Thing: Remove Column Cover and Steering Wheel, Open all Locks and Disconnect Battery

Put Keys in Ignition and release Lock.

Use Youtube Videos to remove the Steering Column Casing and Steering Wheel and AIR BAG. 

First things to check are 

1. Continuity of Connections. The Airbag and Horn connections are done through two connectors on the back of the Airbag unit PINK and PURPLE plugs. 

2. The CIM has a Large Plug around the back to the Left...Unplug this and use a Continuity Meter to test the connection from the PINK and Purple Connectors to the BACK of the CIM unit See PICS below. This will verify the HORN Circuit and AIR Bag Circuit is connected through the CIM Ribbon Cable. 

3. There is a smaller 6 PIN socket next to the PINK and PURPLE connector. This runs the Steering Wheel controls. You can test continuity of these PINS through CIM unit to the Back plate. 

All of these connections are run through a RIBBON Cable that often gets damaged see images below for where to spot Damage. 

If you find continuity for the HORN and Steering Wheel Controls , then the issues lie elsewhere. Try the Horn relay and fuse or Horn Itself. 

Try shorting the Horn Relay socket to sound the horn. Check the connection to the Horn ( Low down Front Driverside behind Valance)

The Steering Wheel Controls are a often damaged due to wear, If your getting intermittant connections for Volume / Screen adjustments etc. These are small plastic units that are wired to the plug on the Steering Wheel. The 8 pin plug runs these through the Ribbon Cable to the back of the CIM. 

If your getting Strange issues like Ignition logic on Radio or Volume Control issues or other things happening regards the Central Media and Climate console, then the Steering Wheel controls may be causing intermittent connections. If you dont have Steering Wheel controls then the CIM may well be faulty and needs replacement.

You cannot DISMANTLE the Unit and attempt to replace the PCB with the Original PCB !

The Airbag Circuit may show high resistance on OPCom, in which case it could be a faulty unit or the cabling may be loose or damaged. Check the above continuity test after removing the unit for cabling connection and use contact cleaner to clean up the Plugs and associated connections.

If the Airbag light comes back on after removal of Errors, its likley the unit needs replacing if the cabling is sound. 

Steering Angle Light : 

The Steering Angle light will come on if the CIM has been tampered with or removed. The Code wheel in the above image marks the Steering Angle and the sensor works from this. If the CIM is faulty OPcom software may show errors elsewhere, however the CIM may need the central bobbin Angle marks to be adjusted or corrected again.