gmc Workshop Repair Guides

GMC Workshop Service and Repair Manuals

Initial Inspection and Diagnostic Overview|Page 11988 > < Initial Inspection and Diagnostic Overview|Page 11986
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Steps 6-8

Steps 1-7

Cruise Control - Indicator Malfunctioning

CRUISE CONTROL INOPERATIVE/MALFUNCTIONING

DIAGNOSTIC AIDS

Perform the following in order to avoid a misdiagnosis:
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Inspect for proper operation of the brake lamps. Refer to Exterior Lighting Systems Description and Operation in Lighting Systems.

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EMI on the vehicle speed sensor signal circuit may cause erratic cruise control operation.

For an intermittent condition, refer to Testing for Intermittent and Poor Connections in Diagnostic Aids.

CONDITIONS FOR ENABLING CRUISE CONTROL

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The vehicle speed is greater than 40 km/h (25 mph).

Initial Inspection and Diagnostic Overview|Page 11988 > < Initial Inspection and Diagnostic Overview|Page 11986