Pinpoint Test T: The Cruise Control Indicator Is Never/Always On

Instrumentation, Message Center and Warning Chimes

Pinpoint Test T: The Cruise Control Indicator Is Never/Always On

Normal Operation

If equipped with adaptive cruise control, the Instrument Panel Cluster (IPC) receives the cruise control set message from the Cruise-Control Module (C-CM) over the High Speed Controller Area Network (HS-CAN) communication bus. If not equipped with adaptive cruise control, the Instrument Panel Cluster (IPC) receives the cruise control signal from the PCM over the HS-CAN communication bus. When the cruise control is engaged, the PCM or the C-CM sends a message to the IPC to illuminate the cruise control indicator.

If the cruise control message is invalid for 5 seconds or less or if the IPC does not receive the cruise control message for 5 seconds or less, the IPC defaults the cruise control indicator to the last indication mode (on/off), based upon the last known good message.

If the cruise control message is missing for more than 5 seconds, the IPC sets DTC U0100:00 (without adaptive cruise control) or DTC U0104:00 (with adaptive cruise control) in continuous memory and defaults the cruise control indicator off.

NOTE: If DTC U0100:00 is set in the IPC, other observable symptoms may be an inoperative speedometer, tachometer or odometer.

This pinpoint test is intended to diagnose the following:

- PCM
- C-CM
- IPC

PINPOINT TEST T: THE CRUISE CONTROL INDICATOR IS NEVER/ALWAYS ON

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T1 CHECK THE CRUISE CONTROL OPERATION

- Check the cruise control system for correct operation.
- Does the cruise control operate correctly?

Yes
GO to T2.

No
REFER to Cruise Control Testing and Inspection.

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T2 CARRY OUT THE IPC INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL

- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IPC DataLogger.
- Select the IPC cruise control indicator (CRUISE) active command. Command the cruise control indicator on and off while observing the cruise control indicator.
- Does the cruise control indicator illuminate when commanded on and turn off when commanded off?

Yes
GO to T3.

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

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T3 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST

- Check for recorded DTCs from the IPC self-test.
- Are any DTCs recorded?

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

For DTC U0104:00, GO to Pinpoint Test AQ. Pinpoint Tests AQ: DTC U0104:00

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

No
For vehicles with adaptive cruise control, INSTALL a new C-CM. REFER to Cruise Control Service and Repair. TEST the system for normal operation.

For vehicles without adaptive cruise control, INSTALL a new PCM. REFER to Electronic Engine Controls Service and Repair. TEST the system for normal operation.

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