Signal Missing
Signal missing
Checking the function of the power seat module (PSM)
Check the function of the control module by operating the seat using the controls.
Can the seat be operated?
Yes - Checking communication with the front power seat module (PSM)
No - Checking the power supply and ground for the front power seat module (PSM)
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Checking the power supply and ground for the front power seat module (PSM)
For information about fuse and terminal numbers, see the relevant Wiring Diagram.
Check fuse F3 and fuse F18 in fuse box engine compartment for Central electronic module (CEM). Check the subsequent cables between fuse box engine compartment fuse box and Central electronic module (CEM) for open -circuit. If any of the fuses are blown, also check for a short-circuit to ground.
Check the fuses for the relevant front seat on the central electronic module (CEM). Also check the fuse for the relay for interior lighting and front seats on the central electronic module (CEM).
Check the cables for voltage between the Central electronic module (CEM) and relevant front seat. Check for a short circuit to ground. Check for a short-circuit to supply voltage. Check for an open-circuit.
Check the connector on power seat module (PSM). Check for contact resistance, and damage.
Remedy as necessary.
Other information
- Connecting the breakout box Connecting the Breakout Box, Power Seat Module Left (PSL)
- Connecting the breakout box Connecting the Breakout Box, Power Seat Module Right (PSR)
- Signal specification Signal Specification, Power Seat Module Left (PSL)
- Signal specification Signal Specification, Power Seat Module Right (PSR)
- Control module front seat Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals
Was a fault detected?
Yes - Verification
No - Checking the relay status for the interior lighting and front seats
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Checking communication with the front power seat module (PSM)
Hint: The CAN communication with the control module is probably OK if the control module ID can be read off. In that case the fault is probably intermittent and will then be more difficult to trace.
Try to communicate with the Power seat module (PSM) by reading off the control module's ID.
Click the symbol for VCT2000 to begin reading off.
Continue - Signal missing
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Signal missing
No Fault Found - No Fault Found
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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 the function of the control module by operating the seat using the controls.
Also check the memory function of the seat, that the seat position can be programmed, recalled and that automatic setting of the seat and door mirrors occurs when the car is unlocked using the remote control.
Can the seat be operated?
Yes - VERIFIED
No - VERIFICATION FAILED
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VERIFIED - FAULT FOUND
VERIFICATION FAILED - Fault-tracing information
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Fault-tracing information
Attempt New Test - Checking the function of the power seat module (PSM)
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Checking the relay status for the interior lighting and front seats
Hint: If the voltage supply to the power seat module (PSM) does not work, this could be due to the relay for interior lighting in the Central electronic module (CEM) not working.
- Ignition on.
Start the smart tool to check the status and activation of the interior lighting relay by clicking on the VCT2000 symbol.
If the relay is not activated and cannot be activated, an internal error has occurred in Central electronic module (CEM). The Central electronic module (CEM) must be replaced in this instance.
Other information
Was a fault detected?
Yes - Verification
No - Signal missing
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