Circuit/System Testing

Ignition/Vehicle 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 30 Ω between the low reference circuit terminal 1 and ground.
- If 30 Ω or greater
1. Ignition/Vehicle Off. Disconnect the harness connector at the K39 Liftgate Control Module
2. Test for less than 2 Ω in the low reference 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 low reference connection.
- Go to next step: If less than 30 Ω
Ignition On/Vehicle in Service Mode.
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/Vehicle 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.
  - Go to next step: 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/Vehicle Off. Remove the test lamp, disconnect the harness connector at the K39 Liftgate Control Module. Ignition On/Vehicle in Service Mode.
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.
- Go to next step: If the test lamp turns ON and OFF
Test or replace the B70 Liftgate Close Switch.