TM 5-3805-293-23-2
0023
Table 1. Cab Electrical Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
19. One or Both Backup
2.
Use a digital multimeter to mea-
Continuity - Replace rear chassis
Lights Do Not Operate
sure continuity between rear
wiring harness (WP 0188).
and/or Backup Alarm
chassis wiring harness connector
Connect the control indicator harness
Does Not Operate - Con-
FA-C22 (WP 0009, Figure 47) ter-
connector PE-C10 (WP 0009, Figure
tinued
minal 2 and machine ground.
288) to control indicator switch (WP
There should be no continuity.
0009, Figure 289).
Connect the control indicator harness
connector PE-C11 (WP 0009, Figure
287) to cab lower wiring harness con-
nector P-C11 (WP 0009, Figure 286)
(WP 0283).
Proceed to step 3.
No Continuity - Replace cab lower
wiring harness (WP 0266).
Connect the control indicator harness
connector PE-C10 (WP 0009, Figure
288) to control indicator switch (WP
0009, Figure 289).
Connect the backup alarm relay (WP
0009, Figure 141) to rear chassis wir-
ing harness connector FA-C33 (WP
0009, Figure 142) (WP 0188).
Connect the rear lamps harness con-
nector AG-C20 (WP 0009, Figure 311)
to rear chassis wiring harness con-
nector FA-C29 (WP 0009, Figure 310)
(WP 0178).
Proceed to step 3.
3. Turn battery disconnect switch,
One or Both Backup Lights and/or
and ignition switch to the ON posi-
Backup Alarm Do Not Operate -
tion. Place control indicator switch
Repeat troubleshooting from the
to position SER. DRIVE. Place
beginning.
the transmission control switch in
Both Backup Lights and Backup
R (TM 5-3805-293-10).
Alarm Operate - Troubleshooting
complete.
Test Step 12. Check for Shorted
Rear Chassis Wiring Harness.
1. Disconnect the rear chassis wir-
ing harness connector FA-C22
(WP 0009, Figure 47) from cab
lower wiring harness connector P-
C69 (WP 0009, Figure 46) (WP
0266).
0023-126
