Part 3
Check the start system (Continued)
Checking the ignition switch
- Change to another key belonging to the vehicle.
- Click on the VCT2000 symbol.
- Check that the status of the ignition switch corresponds to all key positions.
Compare with table in link below.
If key positions' status cannot be read out, or if the shown key position is invalid, the Start Control Unit (SCU) is probably defective.
Other information
- For table, see: Description of switch for start control unit (SCU) Description of Switch for Start Control Unit (SCU)
Are all key positions OK?
Yes - Programming new keys
No - Replacing the Start Control Unit (SCU)
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Programming new keys
- Replace the defective key and program a new key for the vehicle.
Continue - Verification
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Checking the connector
- Check that the 3-pin LIN-connector is assembled correctly.
Continue - Checking the diagnostic trouble codes (DTCs)
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Checking the diagnostic trouble codes (DTCs)
- Ignition switch position II.
- Click the VCT2000 symbol to read diagnostic trouble codes (DTCs).
Check if diagnostic trouble code CEM-1A41 is detected.
Are there relevant diagnostic trouble codes (DTCs)?
Yes - Replacing the Start Control Unit (SCU)
No - Fault-tracing information
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Fault-tracing information
- Ignition off.
- Check relevant fuses for Central electronic module (CEM) and Start control module (SCU).
- Check cables and connections to Central electronic module (CEM).
- Check cables and connections to Start control module (SCU).
Other information
- Checking wiring and terminals Checking Wiring and Terminals
Continue - Checking the ignition switch
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Replacing the Start Control Unit (SCU)
Check the cables and connections between the Start Control Unit (SCU) and the Central electronic module (CEM).
Check the fuse for the Start Control Unit (SCU).
If no fault is found on the cables or connections this means that the Start Control Unit (SCU) is defective and must be replaced.
Other information
- Ignition lock Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals
- For further information about the fuses and relays, see the Wiring Diagram.
Continue - Checking the ignition switch
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Checking the ignition switch
- Click on the VCT2000 symbol.
- Check that the status of the ignition switch corresponds to all key positions.
Compare with table in link below.
Other information
- For table, see: Description of switch for start control unit (SCU) Description of Switch for Start Control Unit (SCU)
Are all key positions OK?
Yes - Verification
No - Fault-tracing information
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Replacing the Start Control Unit (SCU)
Check cables and connections to Start control module (SCU).
Check the fuse for the Start Control Unit (SCU).
If no fault is found on the cables or connections this means that the Start Control Unit (SCU) is defective and must be replaced.
Other information
- Ignition lock Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals
- For further information about the fuses and relays, see the Wiring Diagram.
Continue - Checking the ignition switch
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Fault-tracing information
Is the vehicle equipped with a Gas discharge lamp module (GDL)?
Select an alternative.
Yes - Check LIN diagnostic trouble codes (DTCs)
No - Replacing the central electronic module (CEM)
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Check LIN diagnostic trouble codes (DTCs)
- Disconnect the Gas Discharge Lamp Module (GDL).
The control modules are located by each light. Disconnect the one located on the driver's side.
- Click the VCT2000 symbol to read diagnostic trouble codes (DTCs).
Establish whether relevant LIN diagnostic trouble codes (DTCs) are stored in the control module.
Are there relevant LIN diagnostic trouble codes (DTCs)?
Yes - Fault-tracing information
No - Replacing the central electronic module (CEM)
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Fault-tracing information
- Troubleshoot current LIN diagnostic trouble codes.
See wiring diagram as well.
Continue - DONE
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Replacing the central electronic module (CEM)
- Replace Central electronic module (CEM).
Other information
- Control module relay box passenger compartment Service and Repair
Continue - DONE
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Checking the Steering Column Lock Module (SCL)
Different troubleshooting is available for vehicles with and without steering column lock (SCL). Examine whether the vehicle is equipped with the steering column lock module (SCL) by clicking on the VCT2000 symbol.
Is the vehicle equipped with a steering column lock module (SCL)?
Yes - Checking the Steering Column Lock Module (SCL)
No - Checking the diagnostic trouble codes (DTCs)
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Checking the Steering Column Lock Module (SCL)
Check the start system
Fault-tracing information
- This fault-tracing only applies to vehicles with the symptom Starter motor not running.
- If the starter motor turns but the engine does not start, finish this fault-tracing.
Do you want to continue with this procedure?
Yes - Checking the Steering Column Lock Module (SCL)
No - Exit fault tracing
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Checking locked steering wheel lock
- Remove the key from the ignition switch.
The steering column lock must be locked. It must be impossible to turn the steering wheel.
Is the function OK?
Yes - Checking unlocked steering wheel lock
No - Checking the ignition switch
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Checking the ignition switch
- Click on the VCT2000 symbol.
- Check the status for the switch for key-in.
Is the function OK?
Yes - Checking unlocked steering wheel lock
No - Replacing the Start Control Unit (SCU)
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Checking unlocked steering wheel lock
- Insert the key in the ignition switch.
The steering column lock must be unlocked. It must be possible to turn the steering wheel.
Is the function OK?
Yes - Checking text message in Driver Information Module (DIM)
No - Checking CAN low-speed net
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Checking text message in Driver Information Module (DIM)
- Turn the ignition key to position I.
- Scroll between the messages in the Driver Information Module (DIM) by pressing the READ button.
Search for the text message related to the key, the ignition or steering column lock.
Is there a relevant text message?
Yes - Text message in the Driver Information Module (DIM)
No - Checking text message in Driver Information Module (DIM)
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Checking text message in Driver Information Module (DIM)
- Turn the ignition key to position II.
- Scroll between the messages in the Driver Information Module (DIM) by pressing the READ button.
Search for the text message related to the immobilizer.
Is there a relevant text message?
Yes - Check the Steering Wheel Module (SWM)
No - Checking the ignition switch
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Checking the ignition switch
- Click on the VCT2000 symbol.
- Check that the status of the ignition switch corresponds to all key positions.
Compare with table in link below.
If key positions' status cannot be read out, or if the shown key position is invalid, the Start Control Unit (SCU) is probably defective.
Other information
- For table, see: Description of switch for start control unit (SCU) Description of Switch for Start Control Unit (SCU)
Are all key positions OK?
Yes - Checking the diagnostic trouble codes (DTCs)
No - Replacing the Start Control Unit (SCU)
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Checking text message in Driver Information Module (DIM)
- Turn the ignition key to position I.
- Scroll between the messages in the Driver Information Module (DIM) by pressing the READ button.
Search for the text message related to the key, the ignition or steering column lock.
Is there a relevant text message?
Yes - Text message in the Driver Information Module (DIM)
No - Checking the ignition switch
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