Signal Missing
Signal missing
Information about symptom fault-tracing
The diagnostic trouble codes (DTCs) are included in a larger fault-tracing for the symptom Starter motor not running.
Add the symptom and fault trace according to Checking the start system.
If this has already been carried out, continue fault tracing.
Do you want to continue with this procedure?
Yes - Checking the wiring
No - DONE
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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,
Description of switch for start control unit (SCU) Description of Switch For Start Control Unit (SCU)
Are all key positions OK?
Yes - Check LIN diagnostic trouble codes (DTCs)
No - Replacing the Start Control Unit (SCU)
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Checking the wiring
Check the fuse for the ignition switch in the engine compartment fusebox.
If the fuse is blown, check the circuit after the fuse before replacing the fuse. Check for a short-circuit to ground.
Disconnect connector A on the central electronic module (CEM). Connect the breakout box.
Insert the key in the ignition switch.
Measure the voltage between #A15 (#15) and ground.
The voltage must be 12 V.
Check the cable between terminals #3 and #6 on the start control module (SCU). Check for an open-circuit.
Check the signal cable between central electronic module (CEM) terminal #B17 (#17) and start control module (SCU) terminal #2. Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage.
Check the cable between start control module (SCU) terminal #A1 and ground. Check for an open-circuit. Also check the ground terminal for oxidation.
Remedy the cables as necessary.
Other information
- Connecting the breakout box Connecting the Breakout Box, 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 the ignition switch
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Check LIN diagnostic trouble codes (DTCs)
The Central Electronic Module (CEM) both transmits and receives information via a standardized serial communication method - LIN (Local Interconnect Network).
If the control module registers serious interference in communication, the LIN-diagnostic trouble codes CEM-DDXX are generated.
Note! This part of troubleshooting is performed to check if the Gas Discharge Lamp Module (GDL) interferes with the LIN-communication.The troubleshooting only applies to vehicles equipped with GDL-lights.If the vehicle is not equipped with gas discharge lamps, click the No button to continue.
Disconnect the Gas Discharge Lamp Module (GDL).
Click on the VCT2000 symbol.
Establish whether relevant LIN diagnostic trouble codes (DTCs) are stored in the control module.
These should be remedied first.
Are there relevant diagnostic trouble codes (DTCs)?
Yes - DONE
No - Replacing the control module
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Fault-tracing information
Attempt New Test - Checking the wiring
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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.
Check the operation of the ignition switch. Insert the ignition key in the ignition switch. The steering column lock must then be unlocked. It must be possible to turn the steering wheel.
Can the steering wheel be turned?
Yes - VERIFIED
No - VERIFICATION FAILED
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VERIFIED - FAULT FOUND
VERIFICATION FAILED - Fault-tracing information
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Replacing the control module
- Ignition off.
An internal fault has occurred.
Replace the central electronic module (CEM).
Other information
- Control module relay box passenger compartment Service and Repair
Continue - Verification
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Replacing the Start Control Unit (SCU)
The problem indicates that the control module is defective and needs to be replaced.
Other information
Continue - Verification
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