B1970 - Power Liftgate Close Direction Ratchet Primary Switch Performance: Notes
For a complete wiring diagram, refer to appropriate Wiring Diagram
- >>When Monitored:<< Whenever the power liftgate in performing a power close operation.
- >>Set Condition:<< The ratchet primary (ajar) switch is detected as open before the power cinching operation is started.
| Possible Causes |
|---|
| BINDING LIFTGATE |
| Q901 LOGIC GROUND CIRCUIT OPEN |
| G78 LIFTGATE AJAR SWITCH SENSE CIRCUIT OPEN |
| POWER LIFTGATE LATCH |
| POWER LIFTGATE MODULE |
Theory of Operation
The primary ratchet (ajar) 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 primary position. It is open when in primary and closed when out of primary.
Test Step 1 - DTC Present
NOTE:
This DTC will only set during the cinching 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 B1970 - Power Liftgate Close Direction Ratchet Primary 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 .