TM 5-3805-290-23-1
TROUBLESHOOTING WITHOUT A DIAGNOSTIC CODE - CONTINUED
0008 00
Table 2. Electrical System Troubleshooting - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Backup Alarm Always Off - 3. Check backup alarm circuit for an open 1. If wiring harness is OK, go to Test 4.
4.
circuit.
2. If there is an open circuit in wiring
Continued.
(a) Turn engine start switch and
harness, open circuit is in wire 321 BR
battery disconnect switch to OFF
(backup alarm signal) or wire H807YL
position (TM 5-3805-290-10).
(return signal). Replace wiring harness
(b) At wiring harness connector for
in question (WP 0169 00 thru WP 0175
backup alarm, place a jumper from
00).
contact 1 to contact 2.
(c) At wiring harness connector J2,
measure resistance from J1-12
(backup alarm signal) to J2-4
(return signal).
4. Ensure problem is still active.
1. If problem is no longer active, initial
(a) Inspect and clean harness
problem was probably caused by a poor
connector contacts.
electrical connection and/or a short in
(b) Remove jumper from relay and
a harness connector that was
reconnect harness connectors.
disconnected and reconnected.
(c) Start engine (TM 5-3805-290-10).
Resume normal machine operation.
2. If problem has not been corrected,
replace battery backup alarm relay
(WP 0054 00).
3. If problem still exists, replace machine
ECM (WP 0052 00).
1. Check backup alarm circuit for a short 1. If wiring harness is OK, go to Test 2.
5.
Backup Alarm Always On.
to +battery circuit.
2. If there is a short in wiring harness,
(a) Turn engine start switch and
short is between wire 321 BR (backup
battery disconnect switch to OFF
alarm signal) and circuit with low
position (TM 5-3805-290-10).
resistance measurement. Replace
(b) Disconnect wiring harness from
wiring harness in question (WP 0169
backup alarm (WP 0076 00).
00 thru WP 0175 00).
(c) Disconnect wiring harness
connector J1 and connector J2
from machine ECM (WP 0052 00)
(d) At wiring harness connector J2,
measure resistance from J1-12
(backup alarm signal) to all
possible sources of +battery.
Check resistance to all connectors
used in ECM harness connector.
2. Ensure problem is still active.
1. If problem has not been corrected,
(a) Inspect and clean harness
replace backup alarm relay (WP 0054
connector contacts.
00.
(b) Reconnect all harness connectors. 2. If problem still exists, replace machine
(c) Start engine (TM 5-3805-290-10).
ECM (WP 0052 00).
