BACKUP ALARM WILL NOT SOUND.

TM 5-2420-224-20-1

Table 3-5. Troubleshooting (Cont)

Malfunction

Test or Inspection

Corrective Action

ELECTRICAL SYSTEM (CONT)

70. BACKUP ALARM WILL NOT SOUND.

NOTE

Vehicle MASTER disconnect switch must be ON, ignition switch set to ON, and

group shift lever shifted to R position. Failure to do so will cause erroneous results.

Refer to wiring diagram for all wiring repair steps.

Disconnect connector A (1) and check for +24 VDC between wire 35R (2)

Step 1.

and ground.

If +24 VDC is present, reconnect connect A and go to

If +24 VDC is not present, reconnect connector A and go to

step 2.

Step 2. Check for +24 VDC between wire 35R (2) and ground at fuse box 1 (3).

If +24 VDC is not present, replace fuse.

If +24 VDC is present, repair wiring 35R between fuse box 1

and connector A.

Step 3. Check for +24 VDC between wire 35R (2) and ground at backup alarm

switch (4).

If +24 VDC is not present, repair wiring 35R between

connector A and backup alarm switch.

If +24 VDC is present, go to step 4.

Step 4. Check for +24 VDC between wire 35R1 (5) and ground at backup alarm

switch (4).

If +24 VDC is not present, replace backup alarm switch

(page 4-208).

If +24 VDC is present, go to step 5.

Step 5. Disconnect connector Z (6) and check for +24 VDC between wire 35R1 (5)

and ground.

If +24 VDC is not present, repair wiring 35R1 between

connector Z and backup alarm switch.

If +24 VDC is present, reconnect connector Z and go to step 6.

Step 6. Check for +24 VDC between wire 35R1 (5) and ground at backup alarm (7).

If +24 VDC is present, replace backup alarm (page 4-214).

If +24 VDC is not present, repair wiring 35R1 between

connector Z and backup alarm.