Pinpoint Test Y: The Speed Control Indicator Is Never/Always On

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test Y: The Speed Control Indicator Is Never/Always On

Normal Operation

The Instrument Cluster (IC) receives the speed control signal from the PCM over the High Speed Controller Area Network (HS-CAN) communication bus. When the speed control is engaged, the PCM sends a message to the IC to illuminate the speed control indicator. If the speed control message is missing or if the data is deemed invalid by the IC for more than 5 seconds, the IC sets DTC U0100 in continuous memory and defaults the speed control 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 Y: THE SPEED CONTROL INDICATOR IS NEVER/ALWAYS ON

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Y1 CHECK THE SPEED CONTROL OPERATION


- Verify that the speed control operates.
- Does the speed control operate correctly?

Yes
GO to Y2.

No
REFER to Cruise Control.

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Y2 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 speed control indicator (CRUISE) active command. Command the speed control indicator on and off. Observe the speed control indicator.
- Does the speed control indicator illuminate when commanded on and turn off when commanded off?

Yes
GO to Y3.

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

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Y3 RETRIEVE THE RECORDED DTCs FROM THE IC SELF-TEST


- Check for recorded IC DTCs from the self-test.
- Is DTC U0100 recorded?

Yes
Go To Pinpoint Test AS. Pinpoint Tests AS: DTC U0100

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

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