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Symptom
-----------------------------------------------------------------------------------------------------------------------------------
The Check Engine
indicator stays on
all of the time.
The Function switches
do not operate
properly.
The display system starts
up in the demonstration
mode and remains in it.
The clock doesn't keep
time.
Display is too dark or light.
Possible Problem
The Engine Control Module
(ECM) needs to see the
load of a light connected to it.
The push-button switches are
not connected to the control
box.
The wrong type of switch is
being used.
SW2 terminal is constantly
connected to ground.
Constant power terminal is
losing power.
Contrast need to be adjusted.
VHX Series Specifications
SUPPLY
Voltage Range(BAT)
Ignition
INPUTS
Active High
High, Left, Right,
Gear, Wait, DIM
Active Low
SW1,SW2, Check
Brake, Cruise, 4 X 4
Tachometer
Setting
Normal
Low-Volt
Speedometer
Square Wave
> 1.2 V
P-P
OUTPUT
WARN, SPD
Current Draw
IGN Off
IGN On, LIGHT Off
IGN On, LIGHT On
Solution
Connect a bulb with one wire to
keyed power and the other to
the CHECK ENG terminal.
Momentary push-button or toggle
switches must be connected to
the SW1 and SW2 terminals
as described in the manual.
The switch terminal connected
to the control box should
normally be open. When the
the switch is activated, the
terminal should make contact
to ground.
Disconnect or replace the
SW2 switch.
Ensure Constant Power terminal
has 12v even when key is off.
See manual for contrast adjusting
instructions.
8 to 22 V
> 8 V
Low Max
Min High
3.7 V
8.4 V
Low Max
Min High
2.7 V
6.0 V
3.7 V
8.4 V
Low Max
High Min
3.0 V
7.6 V
0.9 V
4.1 V
Sin Wave
> 1.4 V
P-P
< 600 mA
≈ 0.3 mA
≈ 101 mA
≈ 280 mA
32
MAN 650314:D
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