Pinpoint Test Y: The Cruise Control Message Center Indicator Is Never/Always On

Instrumentation, Message Center and Warning Chimes

Pinpoint Test Y: The Cruise Control Message Center Indicator Is Never/Always On

Normal Operation

The Instrument Panel Cluster (IPC) receives the cruise control indicator on request from the PCM over the High Speed Controller Area Network (HS-CAN). When the cruise control switch is placed in the ON position, the PCM sends the IPC (Instrument Panel Cluster) a standby mode request and the IPC (Instrument Panel Cluster) illuminates the cruise control indicator in gray. When the cruise control is engaged, the PCM sends a cruise control on request message to the IPC (Instrument Panel Cluster) and the IPC (Instrument Panel Cluster) changes the cruise control indicator illumination from gray to green.

If the cruise control message is missing or if the data is deemed invalid by the IPC (Instrument Panel Cluster) for 5 seconds or longer, the IPC (Instrument Panel Cluster) sets DTC U0100:00 in continuous memory and defaults the cruise control indicator off.

NOTE: If DTC U0100:00 sets in the IPC (Instrument Panel Cluster), other observable symptoms may be an inoperative speedometer, tachometer or odometer.

This pinpoint test is intended to diagnose the following:

- Cruise control system concern

- PCM

- IPC (Instrument Panel Cluster)

PINPOINT TEST Y : THE CRUISE CONTROL MESSAGE CENTER INDICATOR IS NEVER/ALWAYS ON

Y1 CHECK THE CRUISE CONTROL OPERATION

- Operate the cruise control.

Does the cruise control operate correctly?

Yes
GO to Y2.

No
REFER to Fire Suppression System.

Y2 CHECK THE MESSAGE CENTER WARNING INDICATOR FUNCTION

- Close all doors, hood and liftgate.

- Ignition ON.

- NOTE: If multiple warnings are present, the message center cycles through each of the warning indicators. Allow the message center to cycle through each display while determining whether the door ajar message center warning indicator is active.
Open the driver door while monitoring the door ajar message center warning indicator.


Does the driver door ajar message center warning indicator turn off with the driver door closed and illuminate with the driver door open?

Yes
GO to Y3.

No
INSTALL a new IPC (Instrument Panel Cluster). REFER to Instrument Panel Cluster (IPC) . TEST the system for normal operation.

Y3 RETRIEVE AND RECORD THE DTCs FROM THE PCM KOEO (Key ON Engine OFF) SELF-TEST

- Check for recorded PCM DTCs from the Key ON Engine OFF (KOEO) self-test.

Are any PCM DTCs recorded?

Yes
REFER to Computers and Control Systems Information.

No
GO to Y4.

Y4 RETRIEVE THE RECORDED DTCs FROM THE IPC (Instrument Panel Cluster) SELF-TEST

- Check for recorded IPC (Instrument Panel Cluster) DTCs from the self-test.

Are any DTCs recorded?

Yes
For DTC U0100:00, GO to Pinpoint Test AQ Pinpoint Test AQ: DTC U0100:00.

For all other DTCs, REFER to DTC Charts Instrumentation, Message Center and Warning Chimes.

No
INSTALL a new PCM. TEST the system for normal operation.