Code
B3822
HUMMER
B — Body
Right Rear Power Window Up Relay Circuit
AI status
Completed
Completed
100%
Causes
- Blown/poor fuse or fusible link feeding the window relay circuit
- Faulty right rear power window up relay (stuck/open/shorted)
- Damaged, corroded or disconnected connector at the relay, BCM, or right rear door harness
- Broken or shorted wiring between the BCM/relay and the right rear door switch or motor
- High resistance in ground or power feed (corrosion, loose terminal)
- Failed right rear window motor or internal motor short that affects the relay circuit
Symptoms
- Right rear window will not move up (may still move down if separate relay/circuit)
- No audible relay click from BCM/relay when up command is pressed
- Intermittent operation of the right rear window (works sometimes)
- Blown fuse when attempting to operate that window or other electrical abnormalities
- Other body functions OK (if fault limited to that circuit) or multiple windows affected if shared feed is compromised
What to check
- Check for stored codes with a compatible scan tool and view freeze/frame data
- Inspect the right rear door wiring harness at the door hinge and door jamb for damage or chafing
- Visually inspect relay, fuse(s) and relay socket for corrosion, heat damage or loose terminals
- Listen for relay click when operating the right rear window up command; try repeat operations
- Backprobe relay coil/control pins and motor supply with window switch commanded
- Measure voltage at the motor connector while commanding 'up' and 'down' to compare behavior
Signal parameters
- Battery supply voltage to relay/motor circuit: ~12.0–14.5 V (engine running) at rest and when NOT activated
- Relay coil/control: expected coil resistance typically ~50–200 Ω (manufacturer-specific); coil is driven by BCM (low-side or high-side switching depending on design)
- Control signal behavior: when BCM commands 'up', one relay coil side should be driven to ground or +12V (depending on design). Expect a transition to ~0 V or battery voltage on the control pin relative to chassis ground during activation.
- Output to window motor when commanded: near battery voltage (≥11 V) at motor supply lead under no-load; voltage drops under load but should be significantly above 0 V
- Motor current: normal running current typically 5–20 A; stall or heavy-load currents can reach 30–60 A (use a suitable current clamp if measuring)
- Open-circuit: infinite resistance between feed and motor when relay is not energized; short to ground or battery would show very low ohms
Diagnostic algorithm
- Retrieve fault code(s) and freeze frame with a scan tool. Note whether code is active or historic and any related door/window codes.
- Perform a visual inspection: fuses, relay, relay socket, wiring at BCM and right rear door hinge area for damage, corrosion, or loose connectors.
- With ignition ON, command the right rear window UP while listening for relay click. If no click, backprobe the relay coil control and coil feed: verify battery feed present and that the BCM toggles the control line when commanded.
- Measure voltage at the motor connector while commanding 'up' and 'down'. If motor sees correct voltages but window does not move, test motor resistance and current draw (with appropriate clamp meter). If motor draws excessive current or stalls, motor or regulator may be faulty.
- If relay does not energize but control line from BCM switches, remove and bench-test or swap the relay with a known-good identical relay. Re-test operation.
- If relay and motor test ok, perform continuity/resistance checks between BCM/relay and door switch/motor connector to locate opens or shorts (inspect inside door where harness flexes).
- Check grounds: verify low resistance (
- If wiring and components test good but the BCM does not command correctly or reports inconsistent feedback, verify BCM power/ground and communication. Reflash/replace BCM only after confirming harness and components good and following manufacturer procedures.
- Clear codes and perform functional test several cycles to confirm repair. Monitor for reappearance of B3822 and note any intermittent behavior for further harness tracing.
Likely causes
- Intermittent connector or harness damage at the right rear door (pin corrosion, wire chafe at hinge)
- Failed/upgraded aftermarket relay with incorrect coil resistance or pinout
- Relay control wire shorted to ground or battery feed under load
- Blown fuse that supplies the relay coil or motor feed
- High-resistance ground at door/chassis creating false fault feedback to BCM
Fault status
Status
Right rear power window UP relay circuit fault detected — check relay, wiring, connector, fuse and module control.
Repair difficulty: Medium
Diagnostic time: 0.5-1.5 hours
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