B1825

Code

HUMMER B — Body

Driver Recline Sensor Circuit Malfunction

Brand: HUMMER

Type: B — Body

Views: UK: 9 EN: 18 RU: 10

AI status

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Page language: EN

Recline motor will not move or only move intermittently
Seat angle indicator or memory function not working or incorrect
Steering column/airbag/seatbelt/occupant detection messages (depending on model)
DTC B1825 stored and possibly repeated after clearing
Intermittent operation that may change with seat movement or tool probing

Retrieve freeze frame and related B‑codes with a scan tool and note any patterns (key state, seat position)
Visually inspect wiring and connectors under driver seat and at seatback for damage, corrosion, or looseness
Check fuses and power/ground for seat control circuits
Use a scan tool to monitor recline sensor live data while moving the seat (by hand if necessary)
Wiggle test harness while watching live data to reproduce fault
Measure reference voltage, signal voltage and ground at the recline sensor connector

Typical reference voltage: ~5 V (varies by manufacturer) — consult service manual for exact value
Typical signal voltage: varies across travel, commonly between ~0.2–4.8 V from one end to the other
Open-circuit: no signal or >4.9–5.0 V; short-to-ground: ~0 V
Potentiometer resistance: often hundreds to a few kiloohms across travel (refer to service data)
Module communicates sensor state as analog voltage or discrete pulses depending on design — verify with factory data

Confirm symptom and retrieve code(s) with a factory-level scan tool. Note when the code sets and any freeze‑frame data.
Visually inspect seat wiring, connectors, and harness routing under the driver seat and at the door sill. Repair obvious damage. Disconnect battery if required by service manual before extensive repairs.
With ignition ON, backprob the recline sensor connector: verify reference voltage and ground at the connector. Compare to factory spec.
Monitor the recline sensor signal with a scan tool or multimeter while moving the seat through full travel. Look for smooth, continuous change in voltage; abrupt drops, jumps, or no change indicate a bad sensor or intermittent wiring.
If no signal or out-of-range, check continuity between sensor connector and seat control module connector; repair any opens/shorts. Wiggle harness to locate intermittent faults.
If wiring and connectors are good, measure sensor resistance (if applicable) while actuating recline. Replace sensor/recline module if values are out of spec or intermittent.
If sensor and harness are good, test/inspect the seat control module input circuit or BCM input. Replace or reprogram module only after confirming wiring and sensor are functional.
After repairs, clear codes and perform required seat calibration or relearn procedures per service information. Retest for recurrence.
If fault persists, escalate to manufacturer-specific diagnostics or module bench testing.

Broken or pinched wire in harness under seat
Connector pushed out or terminals corroded at the recline sensor
Worn potentiometer inside the recline sensor (high resistance/no signal)
Control module input circuit failed after impact or electrical fault
Seat track/hinge damage causing sensor to exceed travel and produce invalid readings

⚠️ Status

Driver Recline Sensor Circuit Malfunction — invalid, open, or shorted signal from driver seat recline position sensor circuit.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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