Code
B1651
Other
B — Body
Seat Driver Recline Backward Circuit Failure
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in the driver seat recline backward circuit
- Poor or corroded connector at the seat control switch, motor, or module
- Failed recline motor/actuator or internal motor short
- Faulty seat position/recline switch or control module
- Blown fuse or tripped circuit protection
- Mechanical binding or obstruction preventing motor movement
Symptoms
- Driver seat will not recline backward when commanded
- Intermittent or no response from seat recline control
- Audible motor click but no movement, or motor runs in wrong direction
- Seat may move only in one direction (forward works, backward fails)
- Related DTC stored and diagnostic trouble light may or may not be present
What to check
- Retrieve stored codes and freeze-frame data with a scan tool
- Visually inspect seat area for damaged wiring, pinched harness, or connector corrosion
- Verify seat fuse and any associated circuit breakers/relays
- Operate recline switch while observing connector(s) — look for loose connections or broken terminals
- Backprobe motor and switch connectors to measure voltage and ground while commanding recline backward
- Perform wiggle test on wiring while operating to reproduce intermittent fault
Signal parameters
- Battery supply to motor/switch when commanded: ~9–14 V (should approach battery voltage under command)
- Ground/return: near 0 Ω continuity to chassis ground
- Recline motor coil resistance (typical): low ohms range (approx. 0.5–10 Ω) — varies by motor; open or very high indicates open winding
- Switch continuity: closed switch should measure near 0 Ω between appropriate pins when actuated
- Control module output: switches between battery and ground drive depending on design (verify with OEM wiring)
Diagnostic algorithm
- Read and record B1651 and any other stored codes; note operating conditions and freeze-frame data.
- Verify fuses and circuit protection for seat adjustment circuit; replace if blown and retest.
- Visually inspect connector at seat recline motor, switch, and control module for corrosion, bent pins, or damage; repair as needed.
- Backprobe the recline motor connector. With a helper operate the recline backward command and verify battery voltage on the supply pin and a return/ground on the other pin. If voltage present and motor does not run, suspect motor or mechanical binding.
- If no voltage at motor when commanded, trace wiring toward switch/module. Check continuity to fuse and control module; repair open/shorts or poor grounds.
- Operate switch and verify switch continuity/operation. Replace switch if faulty.
- If wiring and switch test good but fault persists, bench-test or replace the recline motor/actuator and retest.
- After repair, clear codes, perform multiple recline cycles to confirm proper operation and that code does not return.
Likely causes
- Loose or corroded connector at the recline motor or switch
- Open/short in wiring harness at seat base (pinch point in seat tracks or sill area)
- Failed recline motor or gearbox
- Blown fuse for the seat adjustment circuit
- Faulty recline switch
Fault status
Status
Seat control module has detected a fault in the driver seat recline (backward) circuit (open/short/poor connection or motor/actuator failure).
Repair difficulty: Medium
Diagnostic time: 1.0-2.0 hours
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