Volvo 819 E Service Manual page 100

I
V
Checking diagnostic unit
Switch on ignition
Connect test lead to socket
Measure voltage between control
nail (yellow/red ) and ground
12 V.
approx. Depress
0
now read V.
Measure
is not present at control unit or if instrument
with pushbutton depressed.
At diagnostic unit
Me. sure voltage between connector blue leltd
ground
Vol tmeter should read
ground
Ohmmeter should read
ignition
Measure resistance between diagnostic unit test
lead and pin (No . 8) under function selector
Ohmmet er should read infi
Press function selector
Ohmmeter should now read 0
28
Group Ig ni tion
Fault tracing,
6.
unit connector
. Instrument should read
pushbutton. Voltmeter should
unit connector if voltage
reads
approx. 12 V.
0 ohm.
n ity
button.
V.
system s
Rex-I
N15
termi-
N I B
12 V
NIl
a nd
NIB
219