Circuit/System Testing

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.

Seat Adjuster Switch Circuit Test.

Ignition OFF, disconnect the harness connector at the appropriate seat adjuster switch.
Test for less than 5 ohms between the ground circuit terminal C and ground.
- If greater than the specified range, test the ground circuit for an open/high resistance.
Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal F and ground.
- If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
If all circuits test normal, test or replace the seat adjuster switch.

Seat Adjuster Motor Circuit Test

Ignition OFF, disconnect the harness connector at the seat adjuster motor assembly.
Connect a test lamp between the appropriate control circuit terminals listed below:
- Horizontal motor terminal C and terminal D
- Front vertical motor terminal E and terminal F
- Rear vertical motor terminal A and terminal B
Ignition ON, press the appropriate seat switch in the Forward and Rearward or Up and DOWN directions. The test lamp should turn ON when commanding the up and down or forward and rearward states.
- If the test lamp remains OFF for either of the commands, test the control circuits for a short to ground or an open/high resistance. If the circuits test normal, test or replace the seat adjuster switch.
If all circuits test normal, test or replace the seat adjuster motor assembly.