Circuit/System Testing

WARNING: This page is about a different car, the 2022 Buick Encore GX. However, it is still accessible from the selected car via links, so may be relevant.

Ignition OFF, disconnect the X1 electrical connector at the K84 Keyless Entry Control Module and the X7 electrical connector at the K9 Body Control Module.
Test circuit 4086 from end to end for less than 10 Ω.
- If 10 Ω or greater
  Repair the open/high resistance on the circuit
- Go to next step: If less than 10 Ω
Test circuit 4086 between X1 terminal 10 and ground
- If continuity exists
  Repair the short to ground
- Go to next step: If infinite resistance
Test circuit 4086 for short to voltage end to end
- If voltage is present
  Repair the short to voltage on circuit
- Go to next step: After repairing short to voltage on circuit
Ignition OFF, connect the X1 electrical connector at the K84 Keyless Entry Control Module.
Using a DMM between X7 terminal 13 and ground, verify the K84 Keyless Entry Control Module is grounding the circuit when Keyless Entry is requested by pressing the transmitter.
- If infinite resistance
  Replace the K84 Keyless Entry Control Module
- Go to next step: If a ground is present
Replace the Body Control Module.