B1953
B1953 - Power Liftgate Latch Cinch Overcurrent
For a complete wiring diagram, refer to.
• When Monitored: Whenever the power liftgate is performing a cinching operation.
• Set Condition: The latch motor stall current of 12 amps has been detected for over 500ms, with no ratchet switch transition.
Test Step 1 - DTC Present
• Ensure the battery is fully charged and vehicle charging system is operating properly.
• Ensure the liftgate is closed and with the scan tool, run the "latch home position test" before proceeding to ensure the latch is positioned correctly.
• 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 B1953 - Power Liftgate Latch Cinch Overcurrent?
Yes
• Go to Test Step 2
No
• Using the wiring diagram/schematic as a guide, inspect the wiring and connectors for an intermittent condition. Operate the liftgate several times and check for any binding or other obstructions.
• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior
Test Step 2 - Binding Liftgate
• Examine the liftgate for proper alignment, worn or binding hinges, weak liftgate prop assembly, loose/hard weatherstrip seal , and track assembly for wear or anything that would cause an obstruction to proper operation.
• If necessary manually operate the power liftgate on a known good vehicle and notice the effort needed to open and close for comparison.
• Especially notice the effort needed to unlatch and close the liftgate.
Were any mechanical problems found?
Yes
• Refer to service information for the related symptoms.
• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior
No
• Go to Test Step 3
Test Step 3 - Liftgate Latch Cinch Driver Circuit Short to Ground
• Turn the ignition OFF.
• Disconnect the power liftgate module C2 harness connector.
• Disconnect the power liftgate latch harness connector.
• Measure the resistance between ground and the liftgate latch cinch driver circuit.
• Wiggle the harness and check for an intermittent short condition.
Is the resistance less than 10k ohms?
No
• Go to Test Step 4
Yes
• Repair the liftgate latch cinch driver circuit for a short to ground.
• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior
Test Step 4 - Liftgate Latch Cinch Driver Circuit Short to the Logic Ground Circuit
• Measure the resistance between the logic ground circuit and the liftgate latch cinch driver circuit.
• Wiggle the harness and check for an intermittent short condition.
Is the resistance less than 10k ohms?
No
• Go to Test Step 5
Yes
• Repair the liftgate latch cinch driver wire for a short to the logic ground circuit.
• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior
Test Step 5 - Liftgate Latch Release Driver Circuit Short To Ground
• Measure the resistance between ground and the liftgate latch release driver circuit.
• Wiggle the harness and check for an intermittent short condition.
Is the resistance less than 10k ohms?
No
• Go to Test Step 6
Yes
• Repair the liftgate latch release driver circuit for a short to ground.
• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior
Test Step 6 - Liftgate Latch Release Driver Circuit for a Short to the Logic Ground Circuit
• Measure the resistance between the logic ground circuit and the liftgate latch release driver circuit.
• Wiggle the harness and check for an intermittent short condition.
Is the resistance less than 10k ohms?
No
• Go to Test Step 7
Yes
• Repair the liftgate latch release driver circuit for a short to the logic ground circuit.
• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior
Test Step 7 - Check the Liftgate Latch Cinch Driver Circuit for a Short to the Liftgate Latch Release Driver Circuit
• Measure the resistance between the liftgate latch cinch driver circuit and the liftgate latch release driver circuit in the power liftgate module C2 harness connector.
Is the resistance less than 10k ohms?
Yes
• Repair the liftgate latch cinch driver circuit for a short to the liftgate latch Release driver Circuit.
• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior
No
• Go to Test Step 8
Test Step 8 - Liftgate Latch Cinch Driver Wire Short to Voltage
• Turn the ignition ON.
• Measure the voltage between the liftgate latch cinch driver circuit and ground.
Is there any voltage present?
No
• Replace the power liftgate latch assembly.
• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior
Yes
• Repair the liftgate latch cinch driver circuit for a short to voltage. If the liftgate latch cinch driver circuit is OK, replace the power liftgate module.
• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior