TM 5-3805-293-23-2
0023
Table 1. Cab Electrical Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
18. One or Both Blackout
3. Turn battery disconnect switch to
One or Both Blackout Tail Lights
Tail Lights Do Not Oper-
the ON position and control indi-
Do Not Operate - Repeat trouble-
ate - Continued
cator switch to position B.O.
shooting from the beginning.
DRIVE (TM 5-3805-293-10), and
Both Blackout Tail Lights Operate -
verify both blackout tail lights
Troubleshooting complete.
operate.
N OT E
19. One or Both Backup
Lights Do Not Operate
Always inspect the harness connectorsthat are involved in the circuit.
and/or Backup Alarm
Poor connections can often be the cause of a problem in an electrical
Does Not Operate
circuit. Verify that all connections in the circuit are clean and secure,
and that all connections are in good condition. If a problem with a
connection is found, correct the problem and verify that this diagnostic
code is Active before performing this procedure.
Perform open or short circuit test ateach harness connection to identify
correct harness to replace.
Perform this test only if condition is active.
Test Step 1. Check for Backup
Lamp and/or Backup Alarm.
1. Turn battery disconnect switch,
and ignition switch to the ON posi-
tion (TM 5-3805-293-10).
2. Turn control indicator switch to
position SER. DRIVE (TM 5-
3805-293-10).
3. Place the transmission control
switch in R (TM 5-3805-293-10).
4. Connect MSD (WP 0006). Select
0144-03, 0144-05, or 0144-06 Codes
Trans/Chassis 120M ECM and
Active - Troubleshoot code first
verify 0144-03, 0144-05, or 0144-
before proceeding.
06 is not active.
0144-03, 0144-05, or 0144-06 Codes
Not Active - Proceed to step 5.
5. Visually check if left backup light
Right Backup Only Does Not Oper-
or right backup light or both do not
ate - Proceed to step 6.
operate and listen for backup
Left Backup Only Does Not Operate
alarm.
- Proceed to step 8.
Both Backup Lights Do Not Oper-
ate and Backup Alarm Operates -
Proceed to step 10.
Backup Alarm Only Does Not Oper-
ate - Proceed to step 14.
Both Backup Lights Do Not Oper-
ate and/or Backup Alarm Does Not
Operate - Proceed to Test Step 2.
0023-116