B2357

Code

Other B — Body

Driver Window Down Current Sense Low Circuit Failure

Brand: Other

Type: B — Body

Views: UK: 21 EN: 133 RU: 21

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Page language: EN

Retrieve freeze frame and live data with a scan tool; verify B2357 is active or stored and note conditions when it set
Attempt to operate driver window while watching live current or current sense parameter
Visually inspect fuses, relays, door harness, connectors and motor connector for damage or corrosion
Perform wiggle tests on door harness and connectors while operating window
Measure voltage at the motor connector terminals with window commanded down (expect battery voltage at supply terminal)
Measure continuity and resistance of the sense wire between motor connector and BCM

Supply voltage at motor: ~battery voltage when motor commanded (varies by vehicle)
Motor current while running: typically hundreds of milliamps to several amps under normal load (varies by motor and vehicle)
Current sense voltage: low (~0 V) at rest, increases when motor is commanded; expected range and thresholds vary by manufacturer (consult service data)
Sense circuit should not be open (infinite resistance) or shorted to ground/voltage

Verify the code: connect a scan tool, confirm B2357 is present and note any accompanying codes.
Record live data: command the driver window down and monitor the current or current-sense parameter, supply voltage, and switch inputs.
Inspect: visually inspect door harness, connectors, motor connector, and ground points for corrosion, damage, or water ingress.
Check fuses/relays: verify relevant fuses and relays for the power window circuit are good.
Supply voltage test: with connector connected, have an assistant operate the window while you measure battery voltage at the motor supply terminal; confirm voltage is present when commanded.
Sense circuit continuity: disconnect battery, isolate the sense wire and measure continuity/resistance between motor connector sense pin and BCM/window module sense pin. Check for shorts to ground or battery.
Motor test: if supply and sense wiring are good, disconnect motor and bench-test motor for proper operation and current draw under load. Compare to spec where available.
Connector and pin repair: repair or replace any corroded/damaged connectors, repair broken wires (avoid just soldering across insulation without proper shrink tubing and strain relief).
Module input test: if wiring and motor check good, test or replace BCM/window module or its current-sense circuit per manufacturer procedures.
Clear codes and retest: after repairs, clear the DTCs, operate the window through full travel cycles and confirm the code does not return.