6 APPENDIX B – Troubleshooting Multiplex
Problem/Symptom
Probable Causes
Actions
Sound system not
functioning
Circuit breaker CB11 tripped
1. Check
CB11
2. Check / replace fuse F148, F200
Fire alarm telltale light
and audible alarm always
ON and there is no fire or
high temperature in the
engine compartment
Short-circuited fire sensor or
defective sensor
Prior to start the vehicle, cycle the ignition
key to the ON position, OFF position and
then ON position again and then start the
vehicle. This will deactivate the fire alarm
function. This has to be repeated each
time the vehicle is re-started
The vehicle is parked and
the electrical horn is acti-
vated to indicate a fire in
the engine compartment
but there is no fire
Short-circuited fire sensor or
defective sensor
Cycle the ignition key between the ON
and OFF position twice within 3 seconds.
This will deactivate the fire alarm function.
This has to be repeated each time the
vehicle is parked
A single light, a group of
LED lights or another
function of the vehicle is
not functioning
The multiplex outputs are
protected in current by an
internal “soft-fuse”. When an
output is shorted, it turns
OFF and stays OFF until the
"soft-fuse" is reset
Turn the ignition key to the OFF position
and turn to the ON position again. This
resets all "soft –fuses"
No backlighting in the
instrument cluster
Circuit breaker CB10 is
tripped or fuse F10/F29
blown
Check circuit breaker CB2, CB10
Check / replace fuse F10, F29
Check / replace relay R22, R23
The radiator/CAC fans do
not function and the
engine is overheating
You can manually engage the
radiator/CAC fans half speed (50%) or full
speed (100%).
1. On the Driver Information Display,
select DIAGNOSTICS menu. Select
VEHICLE TESTS submenu and then
ACTIVATE RADIATOR FAN SPEED
50% or ACTIVATE RADIATOR FAN
SPEED 100%.
2. The DID status line will show TEST to
confirm the forced activation of the
radiator fans. To cancel, turn the
ignition switch to the OFF position or
press ESCAPE button, select STOP
TEST submenu and then press
ENTER button twice. TEST will
disappear from the DID status line.
Summary of Contents for H 2018 Series
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