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| Illustration 1 | g01360394 |
Backup alarm circuit | |
The components of the backup alarm circuit are the Power Train/Chassis Electronic Control Module (Power Train/Chassis ECM), the backup alarm, the backup alarm relay, the hoist control position sensor, the shift lever position sensor, the hoist proportioning (raise/eject) solenoid and the hoist proportioning (lower/retract) solenoid.
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| Illustration 2 | g01434290 |
Front view of cab (front cover removed) (1) Power Train/Chassis ECM | |
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| Illustration 3 | g01408773 |
(2) Backup alarm | |
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| Illustration 4 | g01430994 |
Front view of cab (front cover removed) (3) Backup alarm relay | |
With the battery disconnect switch in the ON position, 24 volt power is supplied from the batteries via circuit breaker 1 to Power Train/Chassis ECM (1) .
With the key start switch in the ON position, 24 volt power is supplied from the batteries via circuit breaker 13 to Power Train/Chassis ECM (1) and via circuit breaker 6 to backup alarm relay (3) .
When the shift lever position sensor detects reverse gear and the hoist control position sensor detects that the hoist is in the down position, Power Train/Chassis ECM (1) supplies a ground circuit to energize backup alarm relay (3) .
With the backup alarm relay energized, 24 volt power is supplied to activate backup alarm (2) and the transmission reverse indicator.