Mercedes Benz Truck GL 450 (164.871) V8-4.6L (273.923) Technical Service Bulletin # LI91-22_P-0487712 Date: 100317
Interior - Noisy or Inoperative 3rd Row Power Seat
Folding mechanism of 3rd seat row makes noises or is inoperative
Topic number LI91.22-P-048771
Version 2
Design group 91.22 Seat bench, folding seat bench
Date 03-17-2010
Validity X 164
Reason for change Added note to fill out diagnosis tree and include with returned parts
Reason for block
Complaint:
2010-2020 Mercedes Benz Truck GL 450 (164.871) V8-4.6L (273.923) www.168motive.com Page 182
The electrically folding 3rd seat row makes noises while folding up and down, or the folding function does not work at all.
A warning message about locking the 3rd seat row may also appear in the display.
Cause:
The following causes may apply.
1. The 3rd seat row has stresses in its frame
2. The electric motors for the folding movement are defective
3. The locking mechanism sticks or is inoperative
Remedy:
Note:
As you go through the repair, please check the actions you performed in the attached diagnosis tree. When finished with the repair, please include the
filled out diagnosis tree (including original customer complaint at he bottom) with the parts to be sent to the QEC.
Re. 1.
Before parts of the 3rd seat row or the entire frame of the 3rd seat row are replaced, any existing stresses should first be eliminated. To do this,
unscrew and retighten the bolts connecting the 3rd seat row to the body.
Note:
It may be necessary to rock the seats manually in order to relieve the stresses in the 3rd seat row
Re. 2.
In the event of complaints the electric motor of the folding seat can be replaced individually rather than the entire seat frame as previously.
Re. 3.
Seat cannot be moved via the operating switches
- Check the connections of the seat adjustment motor (if the seat adjustment motor is defective, see "2")
- Check the seat adjustment operating switches
- Read out fault codes (if the seat adjustment motor is defective, see "2")
- Rectify faults in the electric seat adjustment
a) Lock not engaged in loading floor position (folded down)
- Check whether there are any objects under the seat
- Check whether the backrest can be locked by pressing it into the loading floor position
- If "no", continue with step 3b)
- If "yes", loosen seat and bolt back down again in order to eliminate stresses
- If the complaint is not rectified, replace cushion frame
b) Lock not engaged in driving position (folded up)
- Remove load compartment cover (roller blind) and check upper backrest lock
- If the warning lamp does not go out, there is a fault in the locking system, so replace the locking unit (see AR 91.12-P-1110 gy)
- If the warning lamp goes out, there are stresses in the seat, so loosen seat and bolt back down again in order to eliminate stresses
- If the complaint is not rectified, replace backrest frame. (Backrest frame is not available as an individual spare part. You must order the complete
backrest assembly.)
2010-2020 Mercedes Benz Truck GL 450 (164.871) V8-4.6L (273.923) www.168motive.com Page 183
Attachments
Symptoms
Parts
Work Units
WIS-Reference
2010-2020 Mercedes Benz Truck GL 450 (164.871) V8-4.6L (273.923) www.168motive.com Page 184
Validity
Function Testing Of 3rd Seat Row
