TM 5-2420-231-23-1
0043
Table 1. Display and/or Backup Alarm Does Not Turn On - Continued.
043
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3. Using a digital multimeter, mea-
Display and/or Backup
Resistance 5.0 Ohms or Less -
sure resistance between main
Remove jumper wire from main chassis
Alarm Does Not Turn On -
chassis wiring harness connector
wiring harness connector (WP 0007,
Continued
(WP 0007, Figure 6) terminal 7K
Figure 97) terminal B and machine
and machine ground. Resistance
ground.
should be 5.0 ohms or less.
Proceed to Test Step 5.
Resistance Greater Than 5.0 Ohms -
Replace main chassis wiring harness
(WP 0154).
Proceed to Test Step 30.
Test Step 5. Check for Open Front
Console Wiring Harness to Alarm
Using a digital multimeter, measure
Resistance 5.0 Ohms or Less -
resistance between front console wiring
Proceed to Test Step 6.
harness connector (WP 0007, Figure 5)
Resistance Greater Than 5.0 Ohms -
terminal 7K and front console wiring
Replace front console wiring harness
harness connector (WP 0007, Figure
(WP 0162).
75) terminal 30. Resistance should be
Proceed to Test Step 30.
5.0 ohms or less.
Test Step 6. Check for Open Ground
to Alarm Relay.
1. Using a digital multimeter, mea-
Resistance 5.0 Ohms or Less -
sure resistance between front con-
Proceed to step 2.
sole wiring harness connector (WP
Resistance Greater Than 5.0 Ohms -
0007, Figure 75) terminal 87 and
Replace front console wiring harness
machine ground. Resistance
(WP 0162).
should be 5.0 ohms or less.
Proceed to Test Step 30.
2. Using a digital multimeter, mea-
Resistance 5.0 Ohms or Less -
sure resistance between front con-
Proceed to step 3.
sole wiring harness connector (WP
Resistance Greater Than 5.0 Ohms -
0007, Figure 75) terminal 86 and
Replace front console wiring harness
machine ground. Resistance
(WP 0162).
should be 5.0 ohms or less.
Proceed to Test Step 30.
3. Using a digital multimeter, mea-
Resistance 5.0 Ohms or Less -
sure resistance between front con-
Replace alarm relay (WP 0007, Figure
sole wiring harness connector (WP
76).
0007, Figure 75) terminal 85 and
Install instrument panel front cover (WP
front console wiring harness con-
0174).
nector (WP 0007, Figure 71) termi-
Proceed to Test Step 30.
nal J. Resistance should be 5.0
Resistance Greater Than 5.0 Ohms -
ohms or less.
Replace front console wiring harness
(WP 0162).
Proceed to Test Step 30.
0043-5