Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 643 (CRUISE CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESCRUISE CONTROL MALFUNCTION (WITHOUT K59)COMPONENT TESTING
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Component Testing
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Component Testing
WARNING: This page is about a different car, the 2010 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
The cruise control switch must be ON in order to properly measure the resistance of the - SET, + RES, Cancel, Gap Up, Gap Down switches.
Turn Signal/Multifunction Switch
- Ignition OFF, disconnect the X2 harness connector at the turn signal/multifunction switch.
- Connect a DMM between terminal 1 and terminal 4 at the turn signal/multifunction switch.
- Cruise control switch ON, measure the resistance while individually activation and holding each cruise control function switches and compare the resistance reading to the values in the table for the appropriate switch.
- If any of the resistance measurements for the individual switches are not within the specified resistance values, replace the turn signal/multifunction switch.
| Function Switch | Minimum Resistance Value | Maximum Resistance Value |
|---|---|---|
| Off | O.L. | O.L. |
| On | 7.8k Ohms | 8.6k Ohms |
| - SET | 1.2k Ohms | 1.3k Ohms |
| + RES | 2.7k Ohms | 3.0k Ohms |
IMPORTANT:
The cruise control switch must be ON in order to properly measure the resistance of the - SET, + RES, Cancel, Gap Up, Gap Down switches.
Steering Wheel Control Switch - Left
- Ignition OFF, disconnect the harness connector at the steering wheel controls switch - left.
- Measure the resistance between the voltage reference circuit terminal 1 and the signal circuit terminal 2. Individually activate and hold each gap function switch and compare the resistance reading to the values for the Gap Up, Gap Down, Cancel or the neutral position.
- If any of the resistance measurements for the Gap Up, Gap Down, Cancel or neutral position switches are not within the listed resistance values, replace the steering wheel controls - left.
| Function Switch | Minimum Resistance Value | Maximum Resistance Value |
|---|---|---|
| Neutral | O.L. | O.L. |
| Cancel | 1.9k Ohms | 2.1k Ohms |
| Gap Up | 3.5k Ohms | 3.7k Ohms |
| Gap Down | 6.6k Ohms | 6.8k Ohms |
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.