TM 5-3805-298-23-1
0098
Table 1. 637 Backup Alarm Diagnostic Codes - Continued.
098
CID FMI CODE
TEST OR INSPECTION
CORRECTIVE ACTION
6. Remove transmission ECM cover
637-5 Backup Alarm Circuit
(WP 0266).
Current Below Normal -
7. Disconnect connector C-C12
Continued
(WP 0012, Figure 26) from
Transmission ECM J1.
8. Disconnect connector C-C13
(WP 0012, Figure 25) from
Transmission ECM J2.
9. Using digital multimeter
Resistance 5.0 Ohms or Less -
(WP 0174), measure resistance
Replace blackout backup alarm relay
between connector C-C12
(TM 5-3805-298-10).
(WP 0012, Figure 26) terminal 12
Proceed to Test Step 5.
and connector C-C13 (WP 0012,
Resistance Greater Than 5.0 Ohms -
Figure 25) terminal 4.
Proceed to Test Step 4.
Test Step 4. Test Rear Frame Wiring
Harness for High Resistance or
Open.
1. Remove right lower cab access
panels (WP 0347).
2. Disconnect connector M-C1
(WP 0012, Figure 57) from
connector C-C20 (WP 0012,
Figure 56).
3. Using digital multimeter
Resistance 5.0 Ohms or Less -
(WP 0174), measure resistance
Replace lower cab wiring harness
between connector M-C1
(WP 0291).
(WP 0012, Figure 57) terminal 20
Proceed to Test Step 5.
and terminal 1.
Resistance Greater Than 5.0 Ohms -
Replace rear frame wiring harness
(WP 0295).
Proceed to Test Step 5.
Test Step 5. 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) and check for active diagnostic
codes (WP 0008).
0098-6
