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

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

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

Normal Operation

The Instrument Cluster (IC) receives the cruse control signal from the PCM over the High Speed Controller Area Network (HS-CAN) communication bus. When the cruise control is engaged, the PCM sends a message to the IC to illuminate the cruise control indicator.

If the cruise control message is missing for less than 5 seconds, the IC defaults the cruise control indicator to the last on/off state, based upon the last known good cruise control message received.

If the cruise control message is missing for more than 5 seconds, the IC sets DTC U0100 in continuous memory and defaults the cruise control indicator off.

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

This pinpoint test is intended to diagnose the following:

- PCM
- IC



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

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U1 CHECK THE CRUISE CONTROL OPERATION


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

Yes
GO to U2.

No
REFER to Fire Suppression System.

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U2 CARRY OUT THE IC INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IC DataLogger.
- Select the IC 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 U3.

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

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U3 RETRIEVE THE RECORDED DTCs THE IC SELF-TEST


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

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

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

No
INSTALL a new PCM. REFER to Computers and Control Systems. TEST the system for normal operation.

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