120 SECTION 55 - ELECTRICAL SYSTEM
4.7 FUNCTIONAL DESCRIPTION
Auto wake up at every 600 ms for sensing a change
in ENTER, DISPLAY, UP or DOWN switch status
will be provided. Upon sensing of one of those in-
puts transition, the cluster has to wake up.
As a general rule, during cranking, all warnings ac-
tivation and all gauges movements have to be fro-
zen unless we detect an error on the cranking line.
With the key OFF, all indicators must be set to the
parking position. The parking position is hard to ob-
tain with the internal stops of the stepper motor.
With the key ON, follow the procedure below.
Needle collision
control at key-on
At key-on drive all
needles CCW for 1
second
Vibration, service,
transport or battery
loss can generate
a FALSE
If RTZ is observed
on all 5 gauges
TRUE
FALSE
Remove power from gauges:
- engine coolant
- fuel level
Drive gauges until they reach:
- tachometer
- transmission temp
- battery voltage
Drive gauges:
- engine coolant
- fuel level
Start all normal
display functions
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