Diagnostic Enable Circuit w/NP1
WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
The transfer case shift control module is equipped with the ability to store diagnostic information, which is useful to a technician in the event of module, component or wiring concerns. This information can be retrieved via the diagnostic enable circuit from the transfer case shift control module by way of flash codes, which are displayed on the three transfer case shift control switch buttons. These buttons are located on the instrument panel to the right of the steering wheel. For diagnosis of this circuit, refer to DIAGNOSTIC STARTING POINT - TRANSFER CASE in Transfer Case - NVG 233-NP1.