Installation Guide

First InterComm ™ System Installation Guide
Page 12 A29799
November 2007
5.0 Initial Power Test
1. Before connecting to the VCA100, use a voltmeter at the VCA100 power harness
connector to check for a constant +12VDC, switched +12VDC, and ground (Figure 3
shows the VCA100 power connector).
2. Follow the steps as listed in Table 6. Correct any problems encountered before
proceeding to the next step.
Table 6. Initial Power Tests
Required Equipment: Volt/Ohm Meter
Step Procedure Expected Result Verified
1
Verify VCA100 power harness is
disconnected from VCA100 and energized
VCA100 power harness
disconnected and energized
2
Probe the VCA100 power harness connector
Pin 1 for a constant +12 VDC
Voltmeter reads vehicle power
as approximately +12VDC
3 Set the VCA100 power switch to ON Power switch is ON
4
Probe the VCA100 power harness connector
pin 2 for switched +12 VDC (sense)
Voltmeter reads vehicle power
as approximately +12VDC
5 Set the VCA100 power switch to OFF VCA100 is OFF
6
Probe the VCA100 power harness connector
pin 2 for switched +12 VDC (sense)
Voltmeter reads 0 VDC
7
Probe VCA100 power harness connector pin
4 (ground) to chassis ground with ohmmeter
Good ground connection exists
8 Connect VCA100 power harness to VCA100. Items are connected.
9
Turn on VCA100 unit and monitor Activity
LED.
Activity LED lights up during
boot up.
1 2 3
4 5 6
NC
+12
VDC
Sense
NC
+12
VDC
Pwr
Gnd Gnd
Front View of
Molex Connector
1 2 3
4 5 6
1 2 3
4 5 6
1 2 3
4 5 6
NC
+12
VDC
Sense
NC
+12
VDC
Pwr
Gnd
Front View of
Molex Connector
NC