TM 5-3805-298-23-1
0098
Table 1. 637 Backup Alarm Diagnostic Codes - Continued.
098
CID FMI CODE
TEST OR INSPECTION
CORRECTIVE ACTION
4. Using digital multimeter
637-6 Backup Alarm Circuit
Continuity - Replace rear frame wiring
(WP 0174), test for continuity
Current Above Normal -
harness (WP 0295).
between connector M-C1
Continued
Proceed to Test Step 5.
(WP 0012, Figure 57) terminal 20
No Continuity - Proceed to step 5.
and terminal 1.
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 5.
(WP 0012, Figure 57) terminal 20
No Continuity - Proceed to Test Step 4.
and ground.
Test Step 4. Test for Shorted Lower
Cab Wiring Harness.
1. Remove blackout backup alarm
relay (TM 5-3805-298-10) from
C-C31 (WP 0012, Figure 74).
2. install a jumper wire between
terminal B3 and terminal B5 of
connector C-C31 (WP 0012,
Figure 74).
3. Remove left lower cab access
panels (WP 0347).
4. Remove transmission ECM cover
(WP 0266).
5. Disconnect connector C-C12
(WP 0012, Figure 26) from
Transmission ECM J1.
6. Disconnect connector C-C13
(WP 0012, Figure 25) from
Transmission ECM J2.
7. Using digital multimeter
Continuity - Replace lower cab wiring
(WP 0174), test for continuity
harness (WP 0291).
between connector C-C12
Proceed to Test Step 5.
(WP 0012, Figure 26) terminal 12
No Continuity - Proceed to step 8.
and connector C-C13 (WP 0012,
Figure 25) terminal 4.
8. Using digital multimeter
Continuity - Replace lower cab wiring
(WP 0174), test for continuity
harness (WP 0291).
between connector C-C12
Proceed to Test Step 5.
(WP 0012, Figure 26) terminal 12
No Continuity - Replace transmission
and ground.
ECM (WP 0266).
Proceed to Test Step 5.
Test Step 5. Verify Malfunction Is
Resolved.
1. Ensure all wiring harness
connectors are connected.
0098-9
