Commander 2WD V8-4.7L Flex Fuel (2009)
OPERATION
The no fuse indicator gives an indication to the vehicle operator when the Ignition Off Draw (IOD) fuse is ineffective or is not installed. This indicator is
controlled by the instrument cluster logic circuit based upon cluster programming and electronic messages received over the Controller Area Network
(CAN) data bus from the Front Control Module (FCM).
The no fuse indicator function of the reconfigurable dot matrix Organic Light Emitting Diode (OLED) display unit is completely controlled by the
instrument cluster logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the
fused ignition switch output (run-start) circuit. Therefore, the OLED no fuse indication will always be OFF when the ignition switch is in any position
except ON or START. The instrument cluster will turn ON the no fuse indicator for the following reasons:
-
No Fuse Indicator Lamp-On Message - Each time the ignition switch is turned to the ON position and the cluster receives an electronic no fuse
indicator lamp-ON message from the FCM indicating that the IOD fuse is missing or ineffective, the no fuse indicator will be illuminated. The
indicator remains illuminated for about three seconds, until the IOD fuse is installed, until the cluster arbitrator logic determines that another
display request has priority, or until the ignition switch is turned to the OFF position, whichever occurs first.
The FCM continually monitors the IOD circuit to determine the status of the IOD fuse, then sends the proper lamp-ON or lamp-OFF message to the
instrument cluster, also known as the Cab Compartment Node (CCN) over the CAN data bus.
For proper diagnosis of the no fuse indicator, the FCM, the CCN, the CAN data bus or the electronic communication related to no fuse indicator
operation a diagnostic scan tool is required. Refer to the appropriate diagnostic information.
Perform Service Indicator - Description
DESCRIPTION
A perform service indicator is standard equipment on all instrument clusters. However, on vehicles not equipped with an optional diesel engine, this
indicator is electronically disabled. The perform service indication appears within the reconfigurable dot matrix Organic Light Emitting Diode (OLED)
display unit. The perform service indicator consists of a textual PERFORM SERVICE message which appears in place of the compass/trip computer
information in the dot matrix display.
The dot matrix OLED is soldered onto the cluster electronic circuit board, and is visible through a window with a smoked clear lens located on the lower
edge of the tachometer gauge dial face of the cluster overlay. The dark lens over the OLED prevents it from being clearly visible when it is not
illuminated. The textual message appears in the same white color and at the same lighting level as the compass/trip computer information when it is
illuminated by the instrument cluster electronic circuit board.
The perform service indicator is serviced as a unit with the OLED in the instrument cluster.
Perform Service Indicator - Operation
OPERATION
The perform service indicator gives an indication to the vehicle operator when the service distance (kilometers or miles to service) setting becomes zero.
This indicator is controlled by the instrument cluster logic circuit based upon cluster programming and electronic messages received by the cluster from
the Powertrain Control Module (PCM) over the Controller Area Network (CAN) data bus.
The perform service indicator function of the reconfigurable dot matrix Organic Light Emitting Diode (OLED) display unit is completely controlled by
the instrument cluster logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on
the fused ignition switch output (run-start) circuit. Therefore, the OLED perform service indication will always be OFF when the ignition switch is in any
position except ON or START. The instrument cluster will turn ON the perform service indicator for the following reasons:
-
Kilometers Or Miles To Service calculation Equals Zero - The target service distance is set using the customer programmable features function
of the Electronic Vehicle Information Center (EVIC). The cluster subtracts the current odometer distance reading from the target service distance
setting to compute the kilometers or miles to service. Each time the ignition switch is turned to the ON position and the cluster calculates that the
kilometers or miles to service equals zero, the perform service indicator will be illuminated. The indicator remains illuminated for about three
seconds, until the EVIC target service distance is reset, until the cluster arbitrator logic determines that another display request has priority, or until
the ignition switch is turned to the OFF position, whichever occurs first.
The PCM continually monitors the vehicle speed pulse information received from the wheel speed sensors, then sends the proper distance messages to
the instrument cluster, also known as the Cab Compartment Node (CCN) over the CAN data bus. The CCN continually compares the displayed odometer
distance to the target service distance setting to determine the kilometers or miles to service, then controls the perform service indicator as appropriate.
For proper diagnosis of the perform service indicator, the PCM, the CCN, the CAN data bus or the electronic communication related to perform service
indicator operation a diagnostic scan tool is required. Refer to the appropriate diagnostic information.
