B1973 - Power Liftgate Open Direction Ratchet Secondary Switch Performance: Notes
For a complete wiring diagram, refer to appropriate Wiring Diagram
- >>When Monitored:<< Whenever the power liftgate is performing a opening operation.
- >>Set Condition:<< The ratchet secondary switch is still detected as open after 10% of liftgate travel during an opening operation.
| Possible Causes |
|---|
| BINDING LIFTGATE |
| Q901 LOGIC GROUND CIRCUIT OPEN |
| Q76 LATCH SECONDARY POSITION SENSE CIRCUIT OPEN |
| Q76 LATCH SECONDARY POSITION SENSE CIRCUIT SHORT TO VOLTAGE |
| POWER LIFTGATE LATCH |
| POWER LIFTGATE MODULE |
Theory of Operation
The secondary ratchet switch must remain closed when the liftgate is fully open or between full open and closed positions. The switch will open when the liftgate is fully closed and latched. This switch indicates when the latch is in secondary position. It is open when in secondary or primary positions and closed when out of secondary.
Test Step 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.
- With the scan tool, record and erase DTCs.
- Turn the ignition OFF, wait 10 seconds, then turn the ignition ON.
- Operate the power liftgate several times if possible.
- With the scan tool, read Active DTCs.
Does the scan tool display B1973 - Power Liftgate Open Operation - Ratchet Secondary Switch Performance?
Yes
- Go to Test Step 2 Test Step 2 - Binding Liftgate
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. Refer to BODY VERIFICATION TEST .