Circuit/System Testing

Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B70 Liftgate Close Switch. It may take up to 2 min for all vehicle systems to power down.
Test for less than 10 Ω between the ground circuit terminal 1 and ground.
- If 10 Ω or greater
1. Ignition OFF.
2. Test for less than 2 Ω in the ground circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, repair the open/high resistance in the ground connection.
- If less than 10 Ω
Ignition ON
Connect a test lamp between the control circuit terminal 2 and ground.
Verify the test lamp turns ON and dims when commanding the LED Backlight Dimming Command with a scan tool.
- If the test lamp is always OFF
1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K39 Liftgate Control Module.
2. Test for infinite resistance between the control circuit and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - If infinite resistance
3. Test for less than 2 Ω in the control circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, replace the K39 Liftgate Control Module.
- If the test lamp is always ON
1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K39 Liftgate Control Module, ignition ON.
2. Test for less than 1 V between the control circuit and ground.
  - If 1 V or greater, repair the short to voltage on the circuit.
  - If less than 1 V, replace the K39 Liftgate Control Module.
- If the test lamp turns ON and OFF
Test or replace the B70 Liftgate Close Switch.