Checking Drive Status, Backrest

CCA. Fault-tracing information

Condition

No diagnostic trouble codes (DTCs)
The fault is permanent.
No faults detected on the control panel.

Possible source
- Contact resistance in terminals.
- Open-circuit on wiring to motor 2.
- Defective motor 2.
- Defective drive gear.
- Defective control module.

Fault symptom(s)
- No backrest angle adjustment.
- Fault-tracing begins at CCB.

CCB. Checking drive status, backrest

CCB1: Conditions
This fault-tracing procedure assumes that there are no faults detected in the control panel.

Has fault-tracing been carried out on the control panel?

Yes:
- CCB2

No:
- Carry out fault-tracing on the control panel in accordance with the Symptom Table.





CCB2: Check activation
- Ignition OFF.
- Operate the backrest forward/backward using the control button.

Does the backrest move forward and backward?

Yes:
- Fault not found

No:
- CCB3





CCB3: Checking the control module
- Ignition OFF.
- Remove seat from car.
- Connect adapter cables to the seat. Wiring up for voltage measurement Wiring Up For Voltage Measurement
- Connect a voltmeter between ground and the gray 14-pin connector, position B:1 for moving the backrest forward and B:2 for moving the backrest backwards.
- Operate the backrest forward/backward using the control button.
- The voltmeter should indicate battery voltage when the respective buttons are pressed.

If reading is OK:
- CCB5

If reading is incorrect:
- CCB4





CCB4: Replace component
Try a new control module, Service and Repair

Then continue with:
- CCB12





CCB5: Checking motor
- Ignition OFF.
- Cabling in accordance with Wiring Up For Voltage Measurement
- Disconnect drive cable from motor 2. Cable in backrest, Service and Repair
- Run motor 2 using the control button for the backrest.

Is the motor working?

Yes:
- CCB7

No:
- CCB6

CCB6: Replace component
Try a new motor. Motor and potentiometer in backrest, Service and Repair

Then continue with:
- CCB12





CCB7: Checking drive cable operation
- Ignition OFF.
- Cabling in accordance Wiring Up For Voltage Measurement
- Disconnect drive cable from drive gear, Cable in backrest, replacement Service and Repair
- Reinstall drive cable on motor.
- Run motor 2 using the control button for the backrest.
- Check the drive cable.
- The drive cable should turn.

If reading is OK:
- CCB9

If reading is incorrect:
- CCB8

CCB8: Replace component
Try a new drive cable, Cable in backrest, Service and Repair

Then continue with:
- CCB12





CCB9: Checking drive cable length
Measure distance between sheath sleeve and cable end. The wire should stick out at least 10 mm (0.4").

If reading is OK:
- CCB10

If reading is incorrect:
- CCB8





CCB10: Check drive gear
- Open the drive gear by undoing the tour screws on the drive gear housing

Check the worm gear and drive.
Are they OK?

Yes:
- Fault not found

No:
- CCB11

CCB11: Replace component
Try a new drive gear, Drive shaft Under seat replacement, Service and Repair

Then continue with:
- CCB12





CCB12: Verification
Hint: After carrying out the repair, check that the fault has been remedied as follows
- Ignition OFF.
- Reinstall components, connectors etc.
- Operate backrest forward/backward using the control button.
- Does the backrest operate in both directions?

Yes:
- Fault corrected

No:
- CCB13

CCB13: Fault-tracing information
The verification result shows that the fault persists
Do you want to exit fault-tracing?

Yes:
- Fault not corrected

No:
- CCB2