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
Test Step 9. Check for Open Con-
Lights Do Not Operate
trol Indicator Switch.
and/or Backup Alarm
1. Disconnect the control indicator
Does Not Operate - Con-
harness connector PE-C10 (WP
tinued
0009, Figure 288) from control
indicator switch (WP 0009, Figure
289).
2. Using digital multimeter, measure
Resistance Less Than 5.0 Ohms -
resistance between control indica-
Replace control indicator harness
tor switch (WP 0009, Figure 289)
(WP 0283).
terminal J and F. Resistance
Connect the backup alarm relay (WP
should be less than 5.0 ohms.
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.
Resistance 5.0 Ohms or Greater -
Replace control indicator switch (WP
0283).
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).
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.
0023-124
