4 APPENDIX B – Troubleshooting Multiplex
Problem/Symptom
Probable Causes
Actions
Low beam headlamps
and flasher on right side
not functioning
Module AE48 is not powered
or is faulty
1. Check the SYSTEM DIAGNOSTIC
menu of Driver Information Display
(DID). Select FAULT DIAGNOSTIC
and ELECTRICAL SYSTEM. The
message “No Response ModA48,
Active” indicates a power problem on
the module. (A DL0 (BBUS MUX)
network problem would show the
same message but doesn't produce
these symptoms).
2. Check / reset circuit breaker CB10
3. Check / replace fuse F21
4. Probe gray connector on module to
see if it is powered.
Rear flashers not
functioning
Stoplights and center
stoplights not functioning
Module AE51 is not powered
or is faulty
1. Check the SYSTEM DIAGNOSTIC
menu of Driver Information Display
(DID). Select FAULT DIAGNOSTIC
and ELECTRICAL SYSTEM. The
message “No Response ModA51,
Active” indicates a power problem on
the module. (A DL0 (BBUS MUX)
network problem would show the
same message but doesn't produce
this symptom).
2. Check / reset circuit breaker CB8
3. Check / replace fuse F107
4. Probe gray connector on module to
see if it is powered.
Engine is overheating and
radiator fans do not
engage
Module AE52 or AE49 is not
powered or is faulty
1. Check the SYSTEM DIAGNOSTIC
menu of Driver Information Display
(DID). Select FAULT DIAGNOSTIC
and ELECTRICAL SYSTEM. The
message “No Response ModA52/
ModA49, Active” indicates a power
problem on the module. (A DL0
(BBUS MUX) network problem would
show the same message but doesn't
produce this symptom).
2. Check circuit breaker CB5
3. Check / replace fuse F133, F134
4. CB201-CB208
Summary of Contents for H 2018 Series
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