TROUBLESHOOTING WITHOUT A DIAGNOSTIC CODE - CONTINUED
Table 2. Electrical System Troubleshooting - Continued.
TEST OR INSPECTION
2. Check backup alarm circuit for a short
1. If wiring harness is OK, go to Test 3.
Backup Alarm Always Off.
2. If there is a short in wiring harness,
(a) Wiring harness remains
short is between wire 321 BR (backup
disconnected from backup alarm.
alarm signal) and circuit with low
(b) Turn engine start switch and
resistance measurement. Replace
battery disconnect switch to OFF
wiring harness in question (WP 0195
position (TM 5-3805-291-10).
00 thru WP 0201 00).
(c) Disconnect wiring harness
connectors J1 and J2 from
powertrain ECM (WP 0063 00).
(d) Bypass switch side of backup
alarm relay with jumper wire.
(e) At wiring harness connector J2,
(backup alarm signal) to all
possible sources of ground. Check
used in ECM harness connector.