TM 5-3805-292-23
0006
ELECTRICAL TROUBLESHOOTING - WINDSHIELD WIPER AND BLOWER MOTOR INOPERABLE/
EC012 GRID HEATER CIRCUIT TO ENGINE PREHEAT RELAY IS OPEN
0006
Disconnect instrument panel (IP) (WP
Disconnect engine air duct heater relay
connector 55 (WP 0161).
Check for continuity between engine
Perform open harness test for circuit
Continuity
air duct heater relay connector 55,
NO
present?
641 (WP 0173).
circuit 641A (W), harness side and IP
connector C23-7, circuit 641B (W),
Console and Frame 24. Engine Air
Duct Heater).
YES
Check for continuity between engine
Repair circuit 178FG (B) or replace
air duct heater relay circuit 178 (B),
Continuity
NO
harness side and ground (WP 0175,
present?
chassis wiring harness (WP 0146).
Frame 24. Engine Air Duct Heater).
YES
Reconnect instrument panel (IP) (WP
0155). Replace engine air duct heater
relay (WP 0161).