RAM 1500 Truck 4WD V8-5.9L VIN Z (2002)
The wiper switch is a direct input to the instrument cluster. The instrument cluster sends a PCI bus request to the FCM to actuate the wiper ON/OFF
relay. The wiper ON/OFF relay is then actuated through the low side control circuit. This relay switches power to the wiper high/low relay. This circuit is
electronically controlled and continuously monitored for malfunctions.
Electrical Inputs
Headlamp Battery Supplies
12 Volt input as battery supply voltage dedicated for headlamp switching circuits only.
Module Battery Supply
12 Volt input for all FCM functions except headlamp operation.
Power Ground
Ground source for all FCM functions
Ignition Switch RUN or START Position Status
12 Volt input to inform the FCM of the ignition switch status for related FCM functions.
Ignition Switch START Only Status
12 Volt input to allow the FCM to differentiate between the RUN/START and START only status for related FCM functions.
PCI Bus
Approximately 7.5 Volt input to allow the FCM to communicate with other modules on the PCI bus.
Brake Lamp Switch Status
12 Volt input from brake lamp switch for brake shift interlock functions.
Wiper Park Switch
Ground input used to determine the park placement of the wipers. The ground is also used as feedback to the FCM to determine wiper operating mode.
Washer Fluid Level Switch
Ground input from the washer fluid level switch which closes when washer fluid is low.
Right Park Lamp Outage
12 Volt input used to monitor the RH parking lamp circuit.
Left Park Lamp Outage
12 Volt input used to monitor the LH parking lamp circuit.
Battery IOD
A low current 12 Volt input to maintain microprocessor power when the FCM switches to low power consumption mode during ignition OFF.
Battery (+) Connection Detection
12 Volt supply used to monitor battery connection to the IPM. The battery connection to the IPM uses an internal switch to check integrity of the
connection and that the Connector Positive Assurance (CPA) is engaged. If the CPA is not properly engaged, a voltage is sent to the FCM to be
interpreted as an unseated connector which will set a Diagnostic Trouble Code (DTC).
Flash Programming Voltage
20 volt input. When the DRB III is connected and proper flash reprogramming sequence is selected, the 20 Volt signal will be applied to the FCM.
Heating & A/C System
HEATING & A/C SYSTEM
System Availability
Depending on the model, either a Single-Zone Air Conditioning System or Dual-Zone Air Conditioning System is available in these vehicles.
