Component Testing
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Verify the Tow/Haul Mode parameter on the scan tool while cycling the tow/haul switch.
- Ignition Off, transmission in Park, disconnect the transmission Tow/Haul switch assembly.
- Test for infinite resistance between the Tow/Haul switch with the switch in the Open position.
- If not the specified value, replace the Tow/Haul switch assembly.
- Depress and hold the Tow/Haul switch.
- Test for less than 1 ohm of resistance between the Tow/Haul switch signal circuit terminals B and A while the switch is depressed.
- If greater than the specified value, replace the Tow/Haul switch assembly.