SLK 55 AMG (171.473) V8-5.5L (113.989) (2005)
Seat Heater: Customer Interest
Interior, A/C Heated Seats Inoperative
Date: March 11, 2008
Order No.: P-B-91.30/146
Supercedes:
Group: 91
SUBJECT:
Model 171.454/456/473, Up to VIN A143228
Equipped with SA code 873 (Heated seats)
Heated Seats Nonfunctional
If you receive customer reports in the above model vehicles of the driver or passenger side seat heaters not functioning, this may be due to a
hardware fault in the left or right side heater bolster. To resolve, perform the following.
1.
Investigate all stored or present fault codes relating to the seat heater before proceeding.
2.
If the seat heater still does not function, continue to step 3.
3.
Remove the seat cushion as per WIS document AR91.10-P-3310V.
4.
Disconnect the main power supply connector for the heated seat from the seat separation point and the black and white connectors at the side
bolsters.
5.
Using a Mercedes Benz approved multimeter, check the resistance of the seat cushion heating element at the connector (Figure 1, circle).
a.
If the measured resistance is less than ten ohms, the seat cushion element does not contain a hardware fault and is not the cause of the issue.
Terminate any further diagnosis of the heating element in the seat and inspect all connectors for kinks, shorts or bent pins. Then reinstall seat
cushion. Refer to WIS document AR91.10-P-3310V.
b.
If the measured resistance is greater than ten ohms, proceed to step six.
6.
Disconnect the secondary connector plugs from the side bolsters (Figure 2, circles).
7.
Using a Mercedes Benz approved multimeter, check the resistance of the individual side bolsters at the connectors.
a.
If the measured resistance is greater than five ohms in one or both side bolsters, replace the bolster(s) with the high resistance. Refer to WIS
document AR91.30-P-0007V.