Electrical Inputs

ELECTRICAL INPUTS

Headlamp battery supplies 1 & 2 - 12 volt input on pins 1 and 2. Battery supply voltage for switching headlamp circuits only.

Module battery supply - 12 volt input on pin 9. Battery supply voltage for all other FCM operations.

Power ground - Ground source on pin 8 for all FCM operations.

Ignition switch RUN or START position status - 12 volt input on pin 37. Allows the FCM to determine the ignition switch status for related FCM operations.

Ignition switch START only status - 12 volt input on pin 19. Allows the FCM to discriminate between RUN/START input and START for related FCM operations.

PCI Bus - Approximately 7.5 volt input on pin 22. Allows the FCM to communicate with other modules on the vehicle bus.

Stop lamp Switch status - 12 volt input on pin 44. Provides for brake shift interlock function.

Horn Switch - Ground input on pin 17. Primary means for engaging the horn.

Back-up switch - Ground input on pin 39. Input is converted to a PCI Bus status message for use by other modules.

Wiper park switch - Ground input on pin 16. Used to determine park placement of wipers. Also used as feedback to FCM to determine correct operating mode of wipers.

Washer fluid level switch - Ground input to pull-up on pin 18. Ground is switched into the circuit when washer bottle fluid level is low.

Brake fluid level switch - Ground input to pull-up on pin 36. Ground is switched into the circuit when brake fluid level is low.

Ambient temperature sensor - Resistive input to pull-up on pin 25. Corresponding voltage level is converted to a PCI Bus message for use by other modules on the bus.

Right park lamp outage - 12 volt input on pin 21. Used to determine if right park lamp circuit is operating properly.

Left park lamp outage - 12 volt input on pin 41. Used to determine if left park lamp circuit is operating properly.

Battery IOD - 12 volt input on pin 20. The FCM enters a low power consumption mode when the ignition is turned OFF. This low current draw battery supply keeps the microprocessor functioning in the low power mode.

Battery (+) connection detection - 12 volt input on pin 38. The battery connection on the PDC incorporates the use of an internal switch to determine if the connector is properly mated and the Connector Positive Assurance (CPA) is engaged. If the CPA is not properly engaged, a voltage on pin 38 will be interpreted as an unseated connector and a fault will set.

Flash programming voltage - 20 volt input on pin 42. When a DRBIII is connected and the proper flash reprogramming sequence is selected, the 20 volt signal will be applied through pin 42.