LW2 V6-3.0L VIN R (2000)
power to the all-door lock motors. Grounding is achieved through the closed contacts of the door lock relay. Grounding is also achieved through the
winding of the driver door lock motor and the driver door unlock relay.
When an all-door lock has been requested, the ECM switches circuit 195 to battery voltage. This energizes the all-door lock relay which supplies
power to all-door lock motors. Grounding is achieved through the closed contacts of the driver door unlock relay and all-door unlock relay.
Lock/Unlock power application is limited by the BCM to 7 seconds to protect lock motors.
Driver Information
Circuit Chart
CIRCUIT CHART
Circuit assignments for the Body Control Module (BCM) relating to driver information:
LOW BRAKE FLUID
Under low brake fluid conditions, the brake fluid switch closes. When closed, the brake fluid switch grounds circuit 333. The BCM responds by
sending a serial data message to the Instrument Panel Cluster (IPC) to turn On the brake telltale.
COOLANT LEVEL
When engine coolant is at the proper level, the low coolant switch is closed. When in this condition, battery voltage is applied to the low coolant
circuit 1478 input of the BCM.
When coolant is below the proper level, the low coolant switch opens. Because no voltage is applied to circuit 1478 the BCM responds by sending a
serial data message to the instrument panel cluster to turn On the low coolant telltale.
The BCM has an internal timer, which will not turn On the low coolant telltale unless the coolant level is low for greater than 30 seconds. The timer
avoids coolant sloshing falsely turning On the low coolant telltale.
OIL LIFE RESET
The change oil soon telltale is reset by depressing the oil life reset push button switch. This switch is located in the underhood junction block. Pressing
this switch grounds circuit 1579. When grounded, the BCM requests the engine controller to perform an oil life reset. When reset is completed, the
BCM will turn Off the change engine oil telltale.
FUEL LEVEL
The BCM receives fuel level data from the ECM for V6 over CAN and from the PCM for L4 over Class 2. The BCM calculates the data and sends the
result to the cluster Class 2 to control the fuel gauge deflection.
ODOMETER
The BCM calculates vehicle mileage from rolling count data sent to the BCM by CAN message from the ECM on V6, and by Class 2 message from
the PCM on L4 vehicles. The BCM sends the mileage data to the cluster over Class 2 to display the vehicle mileage.
If the BCM is dead and is replaced in the field, the last value displayed by the cluster must be entered into the new BCM with the service tool during
reprogramming.
Gearshift
Circuit Chart
CIRCUIT CHART
