B3822 – Right Rear Power Window Up Relay Circuit

System: Body | Standard: ISO/SAE Controlled | Fault type: Circuit

Definition source: SAE J2012 naming/structure guidance

B3822 – Right Rear Power Window Up Relay Circuit is an ISO/SAE controlled diagnostic trouble code in the Body system. The official meaning is that a circuit fault has been detected in the right rear power window up relay circuit. This points to an electrical problem in the circuit associated with the relay function for the window’s UP operation, not to a guaranteed failure of any single component.

What Does B3822 Mean?

B3822 means the vehicle has detected a circuit fault in the Right Rear Power Window Up Relay Circuit. When an UP command is requested for the right rear power window, the related control module(s) monitor the electrical behavior of the circuit tied to the window-up relay function. If the circuit response is not within expected limits—such as an open circuit, short, or abnormal voltage behavior—the module stores DTC B3822.

This code is specific to the right rear window and the UP relay circuit path. Depending on the vehicle’s design, the circuit may involve relay control and/or relay load paths, wiring, connectors, and module driver circuits that energize or route power for the UP direction.

Quick Reference

• Code: B3822
• Official Title: B3822 – Right Rear Power Window Up Relay Circuit
• System: Body
• Standard: ISO/SAE Controlled
• Fault Type: Circuit
• What it indicates: The circuit associated with the right rear power window UP relay function is not behaving as expected during an UP request.
• Primary area to inspect: Right rear door wiring/connectors, relay circuit wiring/terminals, power and ground integrity for the window/relay circuit.

Symptoms

Symptoms depend on how the vehicle manages right rear window control and how the fault presents (open, short, high resistance, or intermittent). Possible symptoms include:

• Right rear window will not move up: pressing UP results in no movement.
• Intermittent window-up operation: the window moves up sometimes and fails other times.
• Right rear window operates in one direction only: the window may move down but not up, depending on circuit design and fault location.
• Window stops before fully closing: the window begins to move up and then stops.
• Relay or control activity without window movement: the system may appear to command the UP function, but the window does not respond.
• Stored Body DTC: B3822 is present when scanned with a capable scan tool.

Common Causes

Because B3822 is a circuit code, causes typically involve wiring, connectors, power/ground, or the relay-related circuit paths. Examples include:

• Open circuit in the right rear power window up relay circuit wiring.
• Short to ground or short to power affecting the relay control or load circuit for the UP function.
• High resistance due to damaged wiring, poor terminal tension, or degraded connections in the circuit.
• Connector/terminal problems (loose, corroded, backed-out, contaminated, or heat-damaged terminals) in the relay circuit path.
• Relay fault within the circuit (for designs that use a dedicated relay for the UP function), including coil or contact issues that produce abnormal circuit behavior.
• Power feed issue to the window/relay circuit (fuse, circuit protection, splice, or feed connection issue causing improper voltage under load).
• Ground circuit issue affecting relay coil control, relay function, or the window circuit return path.
• Control module driver/circuit issue (where applicable) that prevents correct actuation or monitoring of the UP relay circuit.

Diagnosis Steps

Use a scan tool that can access Body system codes and data, a digital multimeter (DMM), and the correct wiring diagram for the vehicle. The goal is to confirm the fault, identify whether it is in the control side or load side of the relay circuit, and locate the exact point of abnormal voltage, resistance, or continuity.

1. Confirm DTC and module location: Verify B3822 is present and note which module stored it. Record any available fault records (such as battery voltage and command status at the time of failure).
2. Verify the symptom: Attempt to raise the right rear window using all available window controls for that window. Note whether the failure is constant or intermittent.
3. Check related codes and system status: Look for additional Body/window-related DTCs that may indicate a shared power, ground, or communication issue.
4. Inspect circuit protection and feeds: Check fuses/circuit protection for the power window/relay circuit. Verify voltage is present where required and remains stable when the UP function is commanded.
5. Visual inspection of wiring and connectors: Inspect the right rear door harness routing and connectors, especially areas subject to movement and stress (such as harness flex points). Look for insulation damage, pinched wiring, and terminal issues.
6. Identify the UP relay circuit paths: Using the wiring diagram, determine which wires are associated with the right rear power window UP relay circuit (coil control, coil feed/ground, and load/contact paths as applicable).
7. Test command/control side behavior: With the UP function commanded, measure the relay control circuit behavior (voltage, ground switching, or duty cycle as applicable). Compare the readings to expected values shown in service information.
8. Test load side integrity under command: When the UP function is commanded, check for proper voltage delivery through the relay path and at relevant connectors. Perform voltage drop testing across connections that carry current.
9. Continuity and short testing (power off as required): If an open or short is suspected, isolate the circuit and test continuity and short-to-ground/short-to-power conditions per the wiring diagram.
10. Confirm connector pin fit and terminal condition: If measurements suggest intermittent or high resistance, inspect terminal tension and terminal condition at connectors in the relay circuit path.
11. Evaluate module output only after circuit checks: If wiring, terminals, relay function, power feeds, and grounds test good, then evaluate the control module’s related output/driver and circuit monitoring behavior using service procedures.

Possible Fixes

• Repair or replace damaged wiring in the right rear power window up relay circuit (open, short, or high resistance conditions).
• Clean, repair, or replace terminals/connectors with corrosion, poor pin fit, contamination, or heat damage in the affected circuit path.
• Replace the relay associated with the right rear power window UP function if testing confirms a relay-related circuit failure (coil or contact fault).
• Restore proper power feed to the circuit (repair fuse block connections, splices, or feed wiring as needed) if voltage supply is incorrect.
• Restore proper ground for the affected circuit (repair ground wiring/connection points as needed).
• Repair the control module circuit path (wiring between module and relay circuit) or address a verified module driver issue only after all external circuit checks pass.

Can I Still Drive With B3822?

In many cases, the vehicle can still be driven because B3822 is a Body system code focused on the right rear power window up relay circuit, not engine operation. However, the right rear window may not close, may behave inconsistently, or may stop before fully closing. If the window cannot be raised, consider the implications for weather exposure, security, and occupant comfort. If there are signs of an electrical problem (such as repeated fuse failures or heat-damaged connectors), the circuit should be diagnosed and repaired before further use of the window function.

Repair Costs

Repair cost depends on whether the confirmed root cause is wiring, connector condition, a switch or module issue, or the labor needed to diagnose the fault correctly.