Diagnostic Instructions
DTC Descriptor
DTC B3826: Cargo Door/Liftgate Unlock Request Circuit Malfunction.
Circuit/System Description
The body control module (BCM) provides grounds for the liftgate latch assembly lock and unlock controls. If the BCM detects a fault in the Liftgate Lock Motor Unlock Control, DTC B3826 is set.
Conditions for Running the DTC
Battery voltage must be between 9-16 volts.
Conditions for Setting the DTC
This DTC will set when the BCM detects a fault in the Liftgate Lock Motor Unlock Control.
Action Taken When the DTC Sets
• | The BCM stores the DTC to memory. |
• | The rear compartment lid latch will malfunction. |
Conditions for Clearing the DTC
• | This DTC will change from current to history when the fault is no longer present. |
• | A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present. |
• | The technician issues a scan tool CLEAR DTCs command. |
Reference Information
Schematic Reference
Release Systems Schematics
Connector End View Reference
Description and Operation
Rear Hatch/Gate Description and Operation
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
Command the Liftgate Lock Motor and Unlock Motor ON and OFF with a scan tool. The Liftgate Latch Assembly should lock and unlock.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector C1 at the Liftgate Latch Assembly.
- Ignition OFF, test for less than 1.0 ohm of resistance between the control circuit terminal B and ground.
⇒ | If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuits test normal, replace the BCM. |
- Ignition OFF, test for less than 1.0 ohm of resistance between the control circuit terminal A and ground.
⇒ | If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuits test normal, replace the BCM. |
- Connect a test lamp between control circuit terminal B and control circuit terminal A.
- Ignition ON, command the Liftgate Lock to LOCK and UNLOCK with a scan tool. The test lamp should turn ON when commanding the LOCK and UNLOCK states.
⇒ | If the test lamp remains OFF during either of the commands, test for a short to ground on either control circuit. If the circuits test normal, replace the BCM. |
- If all circuits test normal, test or replace the Liftgate Latch Assembly.
Component Testing
- Install a 20-amp fused jumper wire between the control terminal A and 12 volts. Momentarily install a jumper wire between the control terminal B and ground. The Liftgate Latch Assembly should perform the LOCK/UNLOCK function.
⇒ | If the function does not perform as specified, replace the appropriate Liftgate Latch Assembly. |
- Reverse the jumper wires; the Liftgate Latch Assembly should perform the LOCK/UNLOCK function.
⇒ | If the function does not perform as specified, replace the Liftgate Latch Assembly. |
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
Control Module References
for BCM replacement, setup, and programming.