B2502
B2502 - Left Power Sliding Door Latch Release Overcurrent
For a complete wiring diagram, refer to.
• When Monitored: Whenever the power sliding door is performing a releasing operation.
• Set Condition: When the left rear door module senses the latch motor stall current of 6.5 amps has been detected for over 150ms, with no pawl or ratchet failure this code will set.
Test Step 1 - Check For DTCs
• Ensure the left power sliding door is closed and with the scan tool, run the "latch home sector test" before proceeding to ensure the latch is positioned correctly.
• With the scan tool, record DTCs and any power sliding door inhibitors.
• Erase the DTCs.
• Turn the ignition OFF, wait 10 seconds, then turn the ignition ON.
• Attempt to operate the left power sliding door.
• With the scan tool, check for DTCs.
Does the scan tool display B2502 - Left Power Sliding Door Latch Release Overcurrent?
Yes
• Go to Test Step 2
No
• Using the wiring diagrams as a guide, inspect the wiring and connectors for an intermittent condition.
• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior
Test Step 2 - Binding Power Sliding Door
• Examine the power sliding door for proper alignment, worn or binding upper and lower rollers, or a loose/damaged weatherstrip.
• Examine the power sliding door track assembly for wear or anything that would cause an obstruction to proper operation.
• Manually operate the power sliding door on a known good vehicle and notice the effort needed to open and close the door for comparison.
• Especially notice the effort needed to unlatch and cinch the power sliding door.
Were there 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 - Check the Left Cinch/Release Motor Latch Driver Circuit for a Short to Voltage
• Turn the ignition OFF.
• Remove the door module assembly.
• Set the door module assembly on the vehicle floor.
• Reconnect the C316 In - line (Wire Track) connector.
• Disconnect the left rear door latch C3 (motor) connector.
• Turn the ignition ON.
• Measure the voltage between body ground and the left cinch/release motor latch driver circuit in the left rear door latch C3 harness connector.
• Measure the voltage between body ground and the left cinch/release motor unlatch driver circuit in the left rear door latch C3 harness connector.
• Wiggle the harness and check for an intermittent short circuit condition.
• The voltage between each circuit to ground should be approximately 4.0 and 8.0 volts.
Is the voltage more than 8.1 volts on either or both circuits?
Yes
• Repair the left cinch/release motor latch or unlatch driver circuit for a short to voltage.
• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior
No
• Go to Test Step 4
Test Step 4 - Check the Left Rear Power Sliding Door Latch
• Connect a 12 volt test lamp between the cinch/release motor latch circuit and the cinch/release motor unlatch circuit in the C3 connector.
• With the scan tool, actuate the door latch to open then close several times and observe the test lamp.
Does the test lamp illuminate brightly when the latch is actuated in both directions?
Yes
• Replace the left rear power sliding door latch.
• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior
No
• Go to Test Step 5
Test Step 5 - Check the left cinch/release motor latch driver Circuit for an Open
• Turn the ignition OFF.
• Disconnect the left rear door module C1 harness connector.
• Measure the resistance of the left cinch/release motor latch driver circuit between the left rear door module C1 harness connector and the left rear door latch C3 harness connector.
• Wiggle the harness and check for an intermittent open circuit condition.
Is the resistance less than 5.0 ohms?
Yes
• Go to Test Step 6
No
• Repair the left cinch/release motor latch driver circuit for an open.
• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior
Test Step 6 - Check the Left Cinch/Release Motor Unlatch Driver Circuit for an Open
• Measure the resistance of the left cinch/release motor unlatch driver circuit between the left rear door module C1 harness connector and the left rear door latch C3 harness connector.
• Wiggle the harness and check for an intermittent open circuit condition.
Is the resistance less than 5.0 ohms?
Yes
• Go to Test Step 7
No
• Repair the left cinch/release motor unlatch driver circuit for an open.
• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior
Test Step 7 - Check the Left Cinch/Release Motor Latch Driver Circuit for a Short to Ground
• Measure the resistance between the ground and the left cinch/release motor latch driver circuit in the left rear door module C1 harness connector.
• Wiggle the harness and check for an intermittent short circuit condition.
Is the resistance less than 10k ohms?
Yes
• Repair the left cinch/release motor latch driver circuit for a short to ground.
• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior
No
• Go to Test Step 8
Test Step 8 - Check the Left Cinch/Release Motor Unlatch Driver Circuit for a Short to Ground
• Measure the resistance between the ground and the left cinch/release motor unlatch driver circuit in the left rear door module C1 harness connector.
• Wiggle the harness and check for an intermittent short circuit condition.
Is the resistance less than 10k ohms?
Yes
• Repair the left cinch/release motor unlatch driver circuit for a short to ground.
• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior
No
• Go to Test Step 9.
Test Step 9 - Check For Left Cinch/Release Motor Latch Driver Short to Power Sliding Door MUX Return
• Disconnect the left rear door latch C3 connector.
• Measure the resistance between the power sliding door MUX return circuit in the left rear door latch C1 connector and the left cinch/release motor latch driver circuit in the left rear door latch C3 connector.
• Wiggle the harness and check for an intermittent short circuit condition.
Is the resistance less than 10k ohms?
Yes
• Repair the power sliding door MUX return circuit for a short to the left cinch/release motor latch driver circuit.
• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior
No
• Go to Test Step 10
Test Step 10 - Check For Left Cinch/Release Motor Unlatch Driver Short to Power Sliding Door MUX Return
• Measure the resistance between the power sliding door MUX return circuit in the left rear door latch C1 harness connector and the left cinch/release motor unlatch driver circuit in the left rear door latch C3 connector.
• Wiggle the harness and check for an intermittent short circuit condition.
Is the resistance less than 10k ohms?
Yes
• Repair the power sliding door MUX return circuit for a short to the left cinch/release motor unlatch driver circuit.
• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior
No
• Go to Test Step 11
Test Step 11 - Check For Left Cinch/Release Motor Latch Driver Short to the Left Cinch/Release Motor Unlatch Driver Circuit
• Measure the resistance between the left cinch/release motor latch driver circuit and the left cinch/release motor unlatch driver circuit in the left rear door latch C3 connector.
• Wiggle the harness and check for an intermittent short circuit condition.
Is the resistance less than 10k ohms?
Yes
• Repair the left cinch/release motor latch driver circuit for a short to the left cinch/release motor unlatch driver circuit.
• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior
No
• If no obvious mechanical or harness/connector problems were identified, replace the left rear door module.
• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior