B1945-12

B1945-12-POWER LIFTGATE PINCH SENSOR 2 - CIRCUIT SHORT TO BATTERY





For a complete wiring diagram, refer to the Wiring Information.

Theory of Operation

The right pinch sensor provides two functions. It is not only a pinch sensor but is also the Power Liftgate Temperature Sensor.

- When Monitored:
Whenever the Power Liftgate Module is awake.

- Set Condition:
The Power Liftgate Module has detected the Right Liftgate Pinch Sensor circuit voltage is above 5.0 volts for over 20 seconds.





1.

NOTE: The vehicle should be at room temperature when this test is performed
DTC PRESENT
1. With the scan tool, record and erase the DTCs and any liftgate inhibitors.
2. Turn the ignition off, wait 10 seconds, then turn the ignition on.
3. Open and close the liftgate several times.
4. With the scan tool, read the Active DTCs.

Does the scan tool display; B1945-12-POWER LIFTGATE PINCH SENSOR 2 - CIRCUIT SHORT TO BATTERY?

Yes

- Go To 2

No

- Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals and correct pin tension.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. (Q901) LOGIC GROUND OPEN




1. Turn the ignition off.
2. Disconnect the Right Liftgate Pinch Sensor connector.
3. Measure the resistance between ground and the (Q901) Logic Ground circuit in the Right Pinch Sensor harness connector.

Is the resistance below 9.5 Ohms?

Yes

- Go To 3

No

- Repair the (Q901) Logic Ground circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

3. CHECK THE RIGHT LIFTGATE PINCH SENSOR




1. Measure the resistance between the (Q901) Logic Ground circuit and the (Q78) Right Pinch Sensor Signal circuit in the Right Liftgate Pinch/Temp Sensor (Component Side) connector.

NOTE: The graphic shows the harness side - the component side is the male connector.

NOTE: The vehicle should be at room temperature when this test is performed. At 50 deg F the reading should be between 18K and 22K. At 77 deg F the reading should be between 9.12K and 10.88K. At 104 deg F the reading should be between 4.90K and 5.75K.

Is the resistance between 4.9K and 22K Ohms depending on the temperature?

Yes

- Go To 4

No

- Replace the Right Liftgate Pinch/Temp Sensor. Pinch Sensor - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

4. (Q78) RIGHT PINCH SENSOR SIGNAL CIRCUIT OPEN




1. Turn the ignition on.
2. Measure the voltage between the (Q901) Logic Ground circuit and the (Q78) Right Pinch Sensor Signal circuit in the Right Pinch Sensor harness connector.

Is the voltage below 4.5 volts?

Yes

- Go To 5

No

- Go To 6

5. CHECK THE (Q78) RIGHT PINCH SENSOR SIGNAL CIRCUIT FOR AN OPEN




1. Turn the ignition off.
2. Disconnect the Power Liftgate Module C2 harness connector.
3. Measure the resistance of the (Q78) Right Pinch Sensor Signal circuit between the Power Liftgate Module C2 harness connector and the Right Liftgate Pinch Sensor harness connector.

Is the resistance below 2.0 Ohms?

Yes

- Replace the Power Liftgate Module. Power Liftgate Control Module - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Repair the (Q78) Right Pinch Sensor Signal circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

6. (Q78) RIGHT PINCH SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE




1. Measure the voltage between the (Q901) Logic Ground circuit and the (Q78) Right Pinch Sensor Signal circuit in the Right Pinch Sensor harness connector.

Is the voltage above 5.0 volts?

Yes

- Go To 7

No

- Replace the Right Liftgate Pinch Sensor. Pinch Sensor - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

7. (Q78) RIGHT PINCH SENSOR SIGNAL WIRE SHORTED TO VOLTAGE




1. Disconnect the Power Liftgate Module C2 harness connector.
2. Measure the voltage between ground and the (Q78) Right Pinch Sensor Signal circuit in the Right Pinch Sensor harness connector.

Is there any voltage present?

Yes

- Repair the (Q78) Right Pinch Sensor Signal circuit for a short to voltage.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Replace the Power Liftgate Module. Power Liftgate Control Module - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.