C 300 (204.054) V6-3.0L (272.947) (2008)
Grounding Point: All Technical Service Bulletins
TPMS System - Tire Pressure Monitor Inop./DTC 5581
DISPLAY MESSAGE "TIRE PRESSURE MONITOR INOPERATIVE" DTC 5581
Topic Number
LI40.15-P-046651
Version
1
Design Group
40.15 Tire pressure/tire pressure monitoring
Date
09-24-2009
Validity
Model 171.454/456/458/473
Model 204.054/056/077/081/956/987
Reason for change:
Instructions revised foe Xentry/Supersedes DTB S-B-40.15/68
Reason for block
Complaint:
Display Message "Tire pressure Monitor Inoperative" DTC 5581
Cause:
If you receive customer reports in the above model vehicles of the instrument cluster displaying "Tire Pressure Monitor Inoperative" and there is a
corresponding stored fault code of 5581 (front or rear sensor localization failed), this is because the difference in the signal strength between the front
and rear axle may not be enough for the wheel assignments to be accurately made.
Remedy:
NOTE:
If the DTC is present for three consecutive axle location sequences, then the activation menu on the instrument cluster is no longer present until a
successful axle location occurs. Do Not replace the control unit!
To resolve, gain access to the TPM control module (N88) and the module's wiring harness in the rear of the vehicle. For information on component
location, refer to the WIS documents GF40.15-P-0001RC (171) or GE40.15-P-0001CE (204).
NOTE:
Do not erase or clear any of the fault/event codes until the complete repair instructions have been completed.
Repair Part One - Hardware Modifications
Model 171 (Control unit in right side of trunk
1. Starting 57cm from the connector for the TPMS control unit, separate the ground wire (brown wire - Pin # 2) from the electrical harness then cut the
ground wire.
2. Insulate the terminated ground wire which is not being used.
3. Attach a right terminal, part no. A003 546 85 40, to the 57cm long ground wire which runs to the TPMS control unit.
4. Re-route the harness as shown in Figure 1 and 2 with the harness being run vertically from the TPMS control unit down to the body of the vehicle.
NOTE:
If the routing of the ground wire is not followed as shown or the wrong length is used, the repair will not be effective! Do not route wire as shown in
Figure 3!
5. secure to the ground lug as shown in Figure 2.
6. Proceed to Repair Part Two of procedure.