Mercedes Benz Truck R 320 BLUETEC Technical S-91_16-177A Date: 090511
Restraints - Active Head Restraints Self-Activate
Date: May 11, 2009
Order No.: S-B-91.16/177a
Supersedes: T-B-91.16/177 dated Oct. 9, 2008
Group: 91
Revision History
Revision Date Purpose
a 5/11/09 Applicable Models (221) and Images Added / Repair Information Revised
- 10/9/08 Initial issue
SUBJECT:
Model 164.122/125/172/175/177/186/822/825/871/886
Model 221.171/176/177/179/186
Model 251.122/125/156/165/175/177
Active Head Restraints Activates Without Obvious Cause
Mercedes Benz Truck R 320 BLUETEC
Page 246
If you receive customer reports in the above model vehicles of the active head restraint activating without any obvious reason (accident, etc), and/or
any of the fault codes listed are stored in the airbag control unit, this may be caused by damage to the seat wiring harness causing a short circuit.
Follow the steps below to resolve.
Model 164 / 251
1. Remove the seat back lining of the affected seat to access the wiring harness from the vehicle to the seat/headrest and unplug the connector of the
active head restraint. Refer to WIS document AR91.10-P-1915GZ.
2. Inspect the wiring harness for any visible damage. If damaged, repair the wiring harness in accordance with WIS instructions AR00.19-P-0001A.
3. Using a multi-meter measure the resistance between both pins of the headrest. The measured resistance should be between 1-1.5 Ohms. If it
measures 0, there is a short and the head restraints are damaged and need to be replaced (specify by VIN using EPCnet Group 91/065 or 91/070 as
appropriate).
4. Cut a piece of felt (A001 983 52 10) roughly 70 mm x 50 mm and glue onto strut (Figure 1).
Mercedes Benz Truck R 320 BLUETEC
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5. If double white clip is not installed (Figure 2, circle), fasten the wiring harness with cable ties (A002 997 24 90) to the existing two holes.
6. If the two holes are not present, drill two holes 6 mm in diameter. Refer to Figure 3 and Figure 4 for the correct location).
Model 221
1. Remove the seat back lining of the affected seat to access the wiring harness from the vehicle to the seat/headrest and unplug the connector of the
active head restraint. Refer to WIS document AR91.10-P-1915GZ.
2. Inspect the wiring harness for any visible damage (Figure 5). If damaged, repair the wiring harness in accordance with WIS instructions
AR00.19-P-0001A.
Mercedes Benz Truck R 320 BLUETEC
Page 248
3. Fasten wiring with cable ties as illustrated in Figures 6 and 7.
Parts Information
Note:
The following allowable labor operations should be used when submitting a warranty claim for this repair. This information has been generated on
May 11, 2009. Please refer to Netstar --> Star TekInfo --> Star Time for the most current labor time allowance.
Mercedes Benz Truck R 320 BLUETEC
Page 249
In Case of Warranty, use the table above.
Restraints - Active Head Restraints Self-Activate
Date: May 11, 2009
Order No.: S-B-91.16/177a
Supersedes: T-B-91.16/177 dated Oct. 9, 2008
Group: 91
Revision History
Revision Date Purpose
a 5/11/09 Applicable Models (221) and Images Added / Repair Information Revised
- 10/9/08 Initial issue
SUBJECT:
Model 164.122/125/172/175/177/186/822/825/871/886
Model 221.171/176/177/179/186
Model 251.122/125/156/165/175/177
Active Head Restraints Activates Without Obvious Cause
Mercedes Benz Truck R 320 BLUETEC
Page 246
If you receive customer reports in the above model vehicles of the active head restraint activating without any obvious reason (accident, etc), and/or
any of the fault codes listed are stored in the airbag control unit, this may be caused by damage to the seat wiring harness causing a short circuit.
Follow the steps below to resolve.
Model 164 / 251
1. Remove the seat back lining of the affected seat to access the wiring harness from the vehicle to the seat/headrest and unplug the connector of the
active head restraint. Refer to WIS document AR91.10-P-1915GZ.
2. Inspect the wiring harness for any visible damage. If damaged, repair the wiring harness in accordance with WIS instructions AR00.19-P-0001A.
3. Using a multi-meter measure the resistance between both pins of the headrest. The measured resistance should be between 1-1.5 Ohms. If it
measures 0, there is a short and the head restraints are damaged and need to be replaced (specify by VIN using EPCnet Group 91/065 or 91/070 as
appropriate).
4. Cut a piece of felt (A001 983 52 10) roughly 70 mm x 50 mm and glue onto strut (Figure 1).
Mercedes Benz Truck R 320 BLUETEC
Page 247
5. If double white clip is not installed (Figure 2, circle), fasten the wiring harness with cable ties (A002 997 24 90) to the existing two holes.
6. If the two holes are not present, drill two holes 6 mm in diameter. Refer to Figure 3 and Figure 4 for the correct location).
Model 221
1. Remove the seat back lining of the affected seat to access the wiring harness from the vehicle to the seat/headrest and unplug the connector of the
active head restraint. Refer to WIS document AR91.10-P-1915GZ.
2. Inspect the wiring harness for any visible damage (Figure 5). If damaged, repair the wiring harness in accordance with WIS instructions
AR00.19-P-0001A.
Mercedes Benz Truck R 320 BLUETEC
Page 248
3. Fasten wiring with cable ties as illustrated in Figures 6 and 7.
Parts Information
Note:
The following allowable labor operations should be used when submitting a warranty claim for this repair. This information has been generated on
May 11, 2009. Please refer to Netstar --> Star TekInfo --> Star Time for the most current labor time allowance.
Mercedes Benz Truck R 320 BLUETEC
Page 249
In Case of Warranty, use the table above.
