B1959

B1959 - Power Liftgate Drive Clutch Control Circuit High






For a complete wiring diagram, refer to.

• When Monitored: Whenever the power liftgate is power opening or closing.

• Set Condition: The power liftgate module has detected the clutch driver circuit current is under 0.5 amps.






Test Step 1 - DTC PRESENT

• With the scan tool, record DTCs and any liftgate inhibitors.

• Erase DTCs.

• Turn the ignition OFF, wait 10 seconds, then turn the ignition ON.

• Operate the liftgate several times.

• With the scan tool, check for DTCs.

Does the scan tool display B1959- Power Liftgate Drive Clutch Control Circuit High?

Yes

• Go to Test Step 2

No

• Using the wiring diagram/schematic as a guide, inspect the wiring and connectors for an intermittent condition.

• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior

Test Step 2 - Liftgate Clutch Driver Circuit Short to Voltage






• Turn the ignition OFF.

• Disconnect the power liftgate module C1 harness connector.

• Turn the ignition ON.

• Measure the voltage of the liftgate clutch driver circuit between the power liftgate C1 harness connector and ground.

Is there any voltage present?

No

• Go to Test Step 3

Yes

• Repair the liftgate clutch driver circuit for a short to voltage.

• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior

Test Step 3 - Liftgate Clutch Driver Circuit Open






• Disconnect the power liftgate drive unit connector.

• Measure the resistance of the liftgate clutch driver circuit between the power liftgate C1 harness connector and the power liftgate drive unit harness connector.

Is the resistance less than 2.0 ohms?

Yes

• Go to Test Step 4

No

• Repair the liftgate clutch driver circuit for an open.

• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior

Test Step 4 - Check the Ground Circuit for an Open






• The test lamp must illuminate brightly. Compare the brightness to that of a direct connection to the battery.

• Reconnect the power liftgate module C1 harness connector.

• Using a 12 volt test lamp connected to 12 volts, check the ground circuit.

Does the test tight illuminate brightly?

Yes

• Replace the power liftgate drive unit.

• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior

No

• Repair the ground circuit for an open. If the ground circuit is OK, replace the power liftgate module.

• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior