B1423

Code

FIAT B — Body

Rear right electric window motor open circuit

Brand: FIAT

Type: B — Body

Views: UK: 27 EN: 34 RU: 26

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Page language: EN

Visually inspect rear right door harness, motor connector and switch connector for damage, corrosion, water ingress or pushed‑out pins
Verify related fuses and relays for the power windows are intact
Attempt to operate the rear right window and listen for motor activity
Backprobe the motor connector while commanding the window up/down to check for presence of battery voltage and/or ground
Measure resistance across the motor terminals with the connector disconnected (expect low ohms for a good motor; open/infinite indicates internal open)
Check continuity of the wiring from the motor connector to the switch/module and verify good ground at motor body/ground point

Commanded motor terminal voltage: ~battery voltage (11–14.5 V) on one terminal when moving in one direction; the other terminal should be driven to near 0 V or switched to battery when reversing direction
Motor winding resistance (with connector disconnected): typically low ohms (approx. 1–10 Ω); an open circuit will show OL/infinite resistance
No voltage at motor connector while commanding indicates open circuit upstream (wiring/switch/BCM)
Ground continuity from motor housing to chassis: near 0 Ω

Reproduce fault and note any related symptoms; record freeze‑frame/data if available.
Check fuses/relays for the power window circuit; replace if blown and re-test.
Visually inspect the rear right door harness, connector and motor for damage, corrosion or signs of water ingress; repair as needed.
With a helper operating the switch, backprobe the motor connector and check for battery voltage on one terminal and ground or opposite polarity on the other when moving the switch up/down.
If no voltage is present at the motor connector when commanded, verify continuity between the motor connector and the switch/BCM: find the open and repair wiring/connectors.
If voltage is present but motor does not run, disconnect the motor and measure motor winding resistance. Infinite resistance indicates internal open — replace motor.
If motor resistance is normal and voltage is present, check for voltage drop under load and inspect grounds; consider replacing switch or diagnosing BCM output driver if wiring and motor test good.
After repair, clear DTC(s) and perform several up/down cycles to confirm repair; recheck for stored codes and proper operation.

Damaged/disconnected harness to rear right door (wire chafe or pinched during door service)
Corroded/contaminated motor connector or terminal
Internal open winding or connector failure at the motor
Blown fuse or failed relay for the power windows
Faulty switch or BCM output failing to provide voltage/ground

⚠️ Status

Open circuit detected on rear right window motor circuit — motor not responding to command.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5 - 1.5 hours

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