Fault Code Guide

Troubleshooting
For electrical troubleshooting, see Table 1.
Electrical Troubleshooting
Description of Fault Possible Cause
No power at an optional switch output. Switch is
on.
Check appropriate power distribution module (PDM) fuse to see if it is
open or missing. F25 supplies switches 1 and 2. F26 supplies
switches 3 and 4.
No power at an optional switch output. Switch is
on and power supply fuse is proven good.
Check the identification label on the output circuit. Make sure the
output circuit is identified as belonging to the optional switch in use.
Intermittent or no operation. Loss of connection. Could be caused by loose electrical connection(s),
disengaged terminal connection(s), or damaged wire(s). Trace the
suspect circuit.
Table 1, Electrical Troubleshooting
Optional Power Switches and Connection 54.39
Troubleshooting
Business Class M2 Workshop Manual, Supplement 10, September 2006 300/1