Part 4
Check the start system
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.
Note! DTC CEM-1A41 may be set if the driver holds the key position between position II and III for longer than 0.5 second.
Are there relevant diagnostic trouble codes (DTCs)?
Yes - Replacing the Start Control Unit (SCU)
No - Checking the starter motor circuit
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Checking the starter motor circuit
Note! The conditions for this test are that:
- The battery shall be fully charged.
- The car and engine temperatures exceed 20 °C (68 °F).
Warning! If the engine cooling fan is running, wait until it has stopped.
- Ignition off.
- Place the gear selector in neutral (automatic transmission: parking position "P").
- Expose the starter motor relay in the relay/fuse box in the engine compartment. For position of relay, see wiring diagram.
- Short-circuit the cables to the relay socket #3(30) and #5(87) to each other so that the control solenoid pulls.
Hint: A starter motor relay without protective cover can be used for short-circuiting. Close the connectors manually.
Does the starter motor run when the relay is short-circuited?
Yes - Fault-tracing information
No - Checking the starter motor
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Downloading new software
- Download new software in Steering column lock module (SCL).
Continue - Verification
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Fault-tracing information
- Troubleshoot diagnostic trouble code CEM-DD 10.
Continue - DONE
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Fault-tracing information
- Troubleshoot diagnostic trouble code CEM-6C41.
Continue - DONE
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Downloading new software
- Download new software in Central electronic module (CEM).
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
Description of switch for start control unit (SCU) Description Of Switch For Start Control Unit (SCU)
Are all key positions OK?
Yes - Verification
No - Checking the ignition switch
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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
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
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) according to the link below.
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 locked steering wheel lock
No - Checking text message in Driver Information Module (DIM)
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Fault-tracing information
If the starter motor runs, the problem is one of the following:
- Damaged starter motor relay.
- Voltage feed from the ignition to the starter motor relay when cranking. (For certain engine versions via Engine control module (ECM).)
- Engine control module (ECM) does not ground the starter motor relay.
Start troubleshooting by replacing starter motor relay.
Check cable and voltage feed between ignition and starter motor relay.
The reason for the Engine control module (ECM) not being able to activate (grounding) the starter motor relay may be:
- The signal from the clutch pedal sensor via CAN indicates that the clutch pedal is not pressed down enough.
- The signal from the brake pedal position sensor indicates that the brake pedal is not pressed down enough (only applies to the starting conditions that require brake pedal to be pressed down).
- The gear selector's signal (automatic transmissions) for P and N is incorrect.
Continue - Verification
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Checking the starter motor
Troubleshoot according to the checks for starter motor under:
INFORMATION/TROUBLESHOOTING/symptom-related tests/3 Electrical system/30 General/300 General
Continue - Verification
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