Memory Position Fault

SA. Diagnostic trouble code (DTC) information

Condition
The control module can store one seat position set-up in memory position 3. If the control module detects that the contents of memory position 3 does not match a check-sum then diagnostic trouble code (DTC) PSL/PSR-321 is set.

Possible source
- Incorrect procedure for memory storage.
- Defective wiring.
- Defective control.
- Defective control module.

Fault symptom(s)
- Memory function 3 not working.
- This diagnostic trouble code (DTC) may occur without any fault symptom being apparent.
- Fault-tracing begins at SB. Memory position fault.





SB. Memory position fault

SB1: Checking function of the memory button
- Ignition OFF.
Select scrolling values and read off the value for memory button 3 and MEM.

Press in the programming button MEM and keep it pressed while pressing memory storage button 3.
MEM and memory button 3 status should change from NOT ACTIVE to ACTIVE when the respective button is pressed in.

If reading is OK:
- SB2

If reading is incorrect:
- SB5

SB2: Checking memory function 3
Operate the seat so it moves to a new position using the control buttons.

Activate stored memory position 3 to see if the seat moves to that position.

Does the seat move to memory position 3?

Yes:
- SB3

No:
- SB4

SB3: Fault-tracing information
The diagnostic trouble code (DTC) was probably set because no position has been programmed into memory position 3.

Then continue with:
- Fault corrected





SB4: Replace component
The diagnostic trouble code (DTC) was probably set due to an internal fault in the control module.

Try a new control module. Control module, Service and Repair

Then continue with:
- SB9





SB5: Connecting the break-out box
- Ignition OFF.
- Remove seat from car.
- Connect break-out box to 16-pin connector D.Connecting The Break-out Box

Then continue with:
- S66





SB6: Checking memory buttons
- Ignition OFF.
- Break-out box connected.
Connect an ohmmeter between break-out box position 16 (memory button 3) and 36 (ground). Press memory button 3 and read off resistance.

Connect ohmmeter between break-out box position 33 (MEM) and 36 (ground). Press MEM and read off resistance.

The resistance should be 0 ohm when the respective buttons are pressed.

If reading is OK:
- SB8

If reading is incorrect:
- SB7





SB7: Replace component
Repair wiring or replace control panel with a new one. Control panel replacement, Service and Repair

Then continue with:
- SB9





SB8: Checking, contact resistance and oxidation
Check and correct the 16-pin connector positions D: 16 and D:3 for contact resistance and oxidation.

If the fault persists after verification, try a new control module. Control module, Service and Repair

Then continue with:
- SB9





SB9: Verification
Hint: After carrying out the repair, check that the fault has been remedied as follows.
- Ignition OFF.
- Connect up seat in car.

Program a seat position into memory 3.

Activate stored memory position 3 to see if the seat moves to that position.

Does the seal move to memory position 3?

Yes:
- Fault corrected

No:
- SB10

SB10: Fault-tracing information
The verification result shows that the fault persists.
Do you want to exit fault-tracing?

Yes:
- Fault not corrected

No:
- SB1