Electrical - Under Voltage Switch Off Consumers Message
Date: October 1, 2004Order No.: P-B-54.10/117
Supersedes:
Group: 54
SUBJECT:
Model 211.026/065/070/076/082/083/265/282/283
All Model Years
Consumer Shutoff Displayed in Instrument Cluster While Driving
If you receive customer reports on the above model vehicles of the message "Under voltage, switch off consumers" appearing in the Instrument Cluster (IC) while driving the vehicle, please verify the below possible causes. Several causes may exist which may lead to this IC message appearing while driving:
^ Loose / broken poly v-belt, inspect per AP13.22-P-13512.
^ Loose battery terminals.
^ Loose screw connections at the Battery Control Module (BCM).
^ Insufficient alternator power output.
Check the following possible causes prior to replacing any control modules:
1) Check threaded connections of terminals on battery (G1) posts:
a. Clean battery terminals, removing any signs of corrosion.
b. Protect battery terminals from corrosion with terminal grease.
c. Tighten bolts on terminals to the specified torque (7 Nm).
Note:
Corrosion on the battery terminals may cause excessive resistance on the battery posts, in turn triggering the Battery Control Module (BCM) to falsely enter consumer shutoff mode.
2) Check threaded connections on Battery Control Module (BCM) (Figure 1, N82):
a. Remove BCM threaded connection on body and clean contact surface, removing any corrosion or paint residue.
b. Reinstall the BCM threaded connection onto the body and tighten to the specified torque (20 Nm).
c. Disconnect threaded connection of the ground line on the BCM and clean contact surfaces.
d. Reattach the ground line back onto the BCM to the specified tightening torque (12 Nm).
3) Check BCM voltage supply source:
a. At the prefuse box (F33) (Figure 2) in the trunk, check that fuse F84 (5 Amp) and its red supply line are properly seated.
Note:
Make sure ground cable is disconnected.
4) Check alternator (G2):
a. Check charging current and voltage under load as per WIS document AR15.40-P-5010T & AR15.40-P-5011T.
b. Check voltage directly at the battery terminals observing the voltage drop between the alternator and battery.
Note:
The voltage at the battery (G1) should be above 13.5 V, with the engine running, otherwise there may be a contact problem in the wiring between the alternator and the battery.
Note:
The following allowable labor operations should be used when submitting a warranty claim for this repair.
In Case of Warranty, use the table.