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B197A






B197A-00-POWER LIFTGATE LATCH RELEASE - SECTOR SWITCH PERFORMANCE





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

Theory of Operation

The sector switch is essentially a park switch for the latch. When the latch is running a cinch or release operation, the switch is closed. After the cinch or release is complete, the PLGM will reverse direction of the latch until the switch is open.

- When Monitored:
Whenever the power liftgate is performing a latch releasing operation.

- Set Condition:
The sector switch is unstable during a latch releasing operation.





1. DTC PRESENT

NOTE: This DTC will only set during the releasing operation after the four second time out. This may make it difficult to reproduce.

1. With the scan tool, record and erase DTCs.
2. Turn the ignition off, wait 10 seconds, then turn the ignition on.
3. Operate the power liftgate several times if possible.
4. With the scan tool, read the Active DTCs.

Does the scan tool display; B197A-00-POWER LIFTGATE LATCH RELEASE - SECTOR SWITCH PERFORMANCE?

Yes

- Go To 2

No

- Using the wiring diagram/schematic as a guide, inspect the wiring and connectors for an intermittent condition. Operate the door several times and check for any binding or other obstructions.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. BINDING LIFTGATE

NOTE: If the liftgate fails to open manually, refer to the service information. Programming and Relearning.

1. Examine the liftgate for proper fit and alignment, loose/hard or torn seals, misaligned latch striker or anything that would cause an obstruction to proper operation.
2. Manually operate the liftgate of a known good vehicle and notice the effort needed to open and close.
3. Compare the effort needed on the disabled liftgate.
4. Especially notice the effort needed to unlatch and close the liftgate.

Does it take more effort to operate the liftgate than it should?

Yes

- Refer to the Service Information for the related symptom(s). Power Liftgate Operation.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 3

3. LATCH HOME POSITION
1. Make sure the liftgate is closed.
2. With the scan tool in Inputs/Outputs, read the "Sector Gear Switch Closed" state.

Does the scan tool display; YES?

Yes

- Go To 9

No

- Go To 4

4. POWER LIFTGATE LATCH




1. Disconnect the Power Liftgate Latch harness connector.
2. With the scan tool, monitor the Sector Gear Switch Closed state.
3. Connect a jumper wire between the (Q79) Sector Switch Sense circuit and the (Q901) Logic Ground circuit.
4. Repeat the previous step several times by disconnecting and connecting the jumper while observing the scan tool.

Did the scan tool show the switch state changing correctly every time the jumper was connected and disconnected?

Yes

- Replace the Power Liftgate Latch and using the scan tool, run the "Latch Home Sector Test". Power Liftgate Latch - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 5

5. CHECK THE (Q901) LOGIC GROUND CIRCUIT FOR AN OPEN




1. Turn the ignition off.
2. Turn all lights off.
3. Measure the resistance between ground and the (Q901) Logic Ground circuit.
4. Wiggle the harness while observing the ohmmeter.

Is the resistance below 9.5 Ohms?

Yes

- Go To 6

No

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

6. CHECK THE (Q79) SECTOR SWITCH SENSE CIRCUIT FOR A SHORT TO GROUND




1. Measure the resistance between the (Q901) Logic Ground circuit and the (Q79) Sector Switch Sense circuit in the Power Liftgate Latch harness connector.
2. Wiggle the harness while observing the ohmmeter.

Is the resistance below 100.0 Ohms?

Yes

- Go To 11

No

- Go To 7

7. CHECK THE (Q79) SECTOR SWITCH SENSE CIRCUIT FOR AN OPEN




1. Disconnect the Power Liftgate Module C2 harness connector.
2. Measure the resistance of the (Q79) Sector Switch Sense circuit between the Power Liftgate C2 harness connector and the Power Liftgate Latch harness connector.
3. Wiggle the harness while observing the ohmmeter.

Is the resistance below 2.0 Ohms?

Yes

- Go To 8

No

- Repair the (Q79) Sector Switch Sense circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

8. CHECK THE (Q79) SECTOR SWITCH SENSE CIRCUIT FOR A SHORT TO VOLTAGE




1. Turn the ignition on.
2. Measure the voltage of the (Q79) Sector Switch Sense circuit.
3. Wiggle the harness while observing the voltmeter.

Is there any voltage present?

Yes

- Repair the (Q79) Sector Switch Sense wire 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.

9. ADJUST LATCH TO HOME POSITION
1. Close the liftgate.
2. With the scan tool run the "Latch Home Sector Test".

NOTE: This test will try to adjust the sector gear to the Home Position.

3. With the scan tool in Inputs/Outputs, read the "Sector Gear Switch Closed" state.

Does the scan tool display: NO?

Yes

- Repair complete. The latch was not in the Home position.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 10

10. CHECK THE (Q79) SECTOR SWITCH SENSE CIRCUIT FOR A SHORT TO GROUND




1. Disconnect the Power Liftgate Latch harness connector.
2. Measure the resistance between the (Q901) Logic Ground circuit and the (Q79) Sector Switch Sense circuit in the Power Liftgate Latch harness connector.
3. Wiggle the harness while observing the ohmmeter.

Is the resistance below 1000.0 Ohms?

Yes

- Go To 11

No

- Replace the Power Liftgate Latch and using the scan tool, run the "Latch Home Position Test". Power Liftgate Latch - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

11. CHECK THE (Q79) SECTOR SWITCH SENSE CIRCUIT FOR A SHORT TO GROUND




1. Disconnect the Power Liftgate Module C2 harness connector.
2. Measure the resistance between ground and the (Q79) Sector Switch Sense circuit.
3. Wiggle the harness while observing the ohmmeter.

Is the resistance below 1000.0 Ohms?

Yes

- Repair the (Q79) Sector Switch Sense circuit for a short to ground.
- 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.

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