TM 5-3805-292-23
0006
CHASSIS TROUBLESHOOTING - BLOWER MOTOR INOPERATIVE/DOES NOT OPERATE CORRECTLY
0006
Check 20A HVAC fuse (TM 5-3805-
Replace fuse
Fuse
NO
okay?
292-10).
(TM 5-3805-292-10).
YES
Replace HVAC relay
Relay
Test HVAC relay (WP 0173).
NO
okay?
(TM 5-380-292-10).
YES
Remove HVAC relay (TM 5-3805-292-
10).Turn machine power ON (TM 5-
3805-292-10).
12V
Perform Open Harness Test for
Measure voltage between HVAC relay
NO
present?
circuit 120 (WP 0173).
pin 30, circuit 120L (R), fuse box side,
Power Center).
YES
Measure voltage between HVAC
12V
Perform Open Harness Test for
relay pin 86, circuit 137H (R), fuse
NO
box side, and ground (WP 0175,
present?
circuit 137 (WP 0173).
Frame 9. Power Center).
YES
Power down machine (TM 5-3805-
292-10).Remove 20A HVAC fuse
(TM 5-3805-292-10).
Continuity
Perform Open Harness Test for
Check for continuity between HVAC
NO
fuse, circuit 138H (R), fuse box side,
present?
circuit 138 (WP 0173).
and HVAC relay pin 87, circuit 138H
9. Power Center).
YES
Check for continuity between HVAC
Continuity
relay pin 85 fuse box side and ground
Repair ground to relay (WP 0173).
NO
present?
YES
Install fuse and relay.
AB
CONTINUED
