PREVOST H3-41 Maintenance Manual page 210

SECTION 06: ELECTRICAL
Problem/Symptom
A single light, a group of
LED lights or another
function of the vehicle is
not functioning
No backlighting in the
instrument cluster
The radiator/CAC fans do
not function and the
engine is overheating
46 PA1621 Maintenance Manual All Series | Revised Sept 2019
Probable Causes
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
Circuit breaker CB10
tripped or fuse F10/F29
blown
Actions
Turn the ignition key to the OFF position
and turn to the ON position again. This
resets all "soft –fuses"
is Check circuit breaker CB2, CB10
Check / replace fuse F10, F29
Check / replace relay R22, R23
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
TERMINATE TESTS & FORCED
STATES submenu and then press
ENTER button twice. TEST will
disappear from the DID status line.
button, select