Pinpoint Tests AA: The Cruise Control Indicator Is Never/Always On

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test AA: The Cruise Control 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) communication bus. When the cruise control switch is placed in the ON position, the PCM sends the IPC a standby mode request and the IPC illuminates the cruise control indicator amber. When the cruise control is engaged, the PCM sends a cruise control on request message to the IPC and the IPC changes the cruise control indicator illumination from amber to green.

If the cruise control message is missing or if the data is deemed invalid by the IPC for more than 5 seconds, the IPC sets DTC U0100:00 in continuous memory and defaults the cruise control off.

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

This pinpoint test is intended to diagnose the following:

- PCM
- IPC

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

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AA1 CHECK THE CRUISE CONTROL OPERATION

- Operate the cruise control.
- Does the cruise control operate correctly?

Yes
GO to AA2.

No
REFER to Cruise Control Testing and Inspection.

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AA2 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. Observe the cruise control indicator.
- Does the cruise control indicator illuminate when commanded on and turn off when commanded off?

Yes
GO to AA3.

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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AA3 RETRIEVE AND RECORD THE DTCs FROM THE PCM KOEO 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.

No
GO to AA4.

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AA4 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST

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

Yes
For DTC U0100:00, GO to Pinpoint Test BA. For all other DTCs, REFER to DTC Charts. Pinpoint Tests BA: DTC U0100:00

No
INSTALL a new PCM. REFER to Electronic Engine Controls Powertrain Control Module (PCM). TEST the system for normal operation.

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