TM 5-3805-298-23-1
0098
Table 1. 637 Backup Alarm Diagnostic Codes - Continued.
098
CID FMI CODE
TEST OR INSPECTION
CORRECTIVE ACTION
2. Disconnect connector M-C4
637-3 Backup Alarm Circuit
(WP 0012, Figure 75) from backup
Voltage Is Above Normal -
alarm.
Continued
3. Remove right lower cab access
panels (WP 0347).
4. Disconnect connector M-C1
(WP 0012, Figure 57) from
connector C-C20 (WP 0012,
Figure 56).
5. Using digital multimeter
Continuity - Replace rear frame wiring
(WP 0174), test for continuity
harness (WP 0295).
between connector M-C1
Proceed to Test Step 4.
(WP 0012, Figure 57) terminal 20
No Continuity - Proceed to Test Step 3.
and all other M-C1 terminals.
Test Step 3. Test for Shorted Lower
Cab Wiring Harness.
1. Remove left lower cab access
panels (WP 0347).
2. Remove transmission ECM cover
(WP 0266).
3. Disconnect connector C-C12
(WP 0012, Figure 26) from
Transmission ECM J1.
4. Using digital multimeter
Continuity - Replace lower cab wiring
(WP 0174), test for continuity
harness (WP 0291).
between connector C-C12
Proceed to Test Step 4.
(WP 0012, Figure 26) terminal 12
No Continuity - Replace transmission
and all other C-C12 terminals.
ECM (WP 0266).
Proceed to Test Step 4.
Test Step 4. Verify Malfunction Is
Resolved.
1. Ensure all wiring harness
connectors are connected.
2. Install transmission ECM cover
(WP 0266).
3. Install right and left lower cab
access panels (WP 0347).
4. Ensure the military light switch is in
SER. DRIVE position (TM 5-3805-
298-10).
5. Ensure transmission control switch
is in R position (TM 5-3805-298-
10).
0098-3
