LIN Bus 2
Communication fault
Checking the component and wiring
The diagnostic trouble code (DTC) indicates that communication between the central electronic module (CEM) and the steering column lock module (SCL), the start control module (SCU), the left-hand gas discharge lamp module (GDL) (accessory) and the right-hand gas discharge lamp module (GDL) (accessory) is not functioning. This may be due to a fault in the signal cable between the control modules or a defective communication device in one or all of the control modules.
Check the signal cable between the central electronic module (CEM) and the steering column lock module (SCL). Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage.
Take readings between:
- Central electronic module (CEM) connector terminal #B17 (#17) and steering column lock module (SCL) terminal #4.
Check the cable between the central electronic module (CEM) and the start control module (SCU). Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage.
Take readings between:
- Central electronic module (CEM) connector terminal #B17 (#17) and start control module (SCU) terminal #2.
Check the cable between the central electronic module (CEM) and the left-hand gas discharge lamp module (GDL). Check for an open-circuit. Check for a short-circuit to ground or supply voltage.
Take readings between:
- Central electronic module (CEM) connector terminal #G26 (#26) and left-hand gas discharge lamp module (GDL) terminal #A12.
Check the cable between the left-hand gas discharge lamp module (GDL) and the right-hand gas discharge lamp module (GDL). Check for an open-circuit. Check for a short-circuit to ground or supply voltage.
Take readings between:
- Left-hand gas discharge lamp module (GDL) connector terminal #11 and right-hand gas discharge lamp module (GDL) terminal #A11.
Other information
- Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- Location of components Component Location, Central Electronic Module (CEM)
- Control module relay box passenger compartment Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals
Was a fault detected?
Yes - Verification
No - Checking communication
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Checking communication
To check whether all the units are communicating, part numbers for the units can be read off.
Click the VCT2000 symbol to begin reading off part numbers.
Do all the units respond?
Yes - Verification
No - Replacing the control module
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Replacing the control module
Try replacing the control module that did not respond with its part number.
Other information
- Steering lock Service and Repair
Continue - Verification
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Verification
Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off
- Reinstall the connectors, components etc.
- Ignition on.
Check that it is possible to activate the starter motor.
Check that it is possible to remove the key from the ignition switch.
If the vehicle has GDL lamps, also check the following:
- Activate low beam
- Activate high beam flash
- Activate high beam.
Check that the functions are OK.
Are the functions OK?
Yes - VERIFIED
No - VERIFICATION FAILED
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VERIFIED - FAULT FOUND
VERIFICATION FAILED - Fault-tracing information
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Fault-tracing information
Information
Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.
Do you want to exit fault-tracing?
Yes - Exit fault-tracing
No - Attempt New Test
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Attempt New Test - Checking the component and wiring
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