Code
B1422
FIAT
B — Body
Rear right electric window motor circuit
Views:
UK: 2
EN: 7
RU: 8
AI status
Completed
Completed
100%
Causes
- Blown fuse or circuit breaker for power windows
- Damaged, corroded or disconnected wiring or connector at the rear-right door
- Failed rear-right window motor
- Faulty window switch (rear-right or master switch)
- Faulty window control module or body control module (BCM)
- Mechanical binding or seized window regulator increasing motor load
Symptoms
- Rear right window does not move when commanded
- Window moves slowly or intermittently
- Window reverses or moves unpredictably
- Fuse blows or circuit breaker trips when operating the rear right window
- Clicking relay/noise from motor but no window movement
- Burning smell around door or motor area (indicates overheating/high current)
What to check
- Visual inspection of rear-right door harness, connectors and motor for corrosion, damage or water ingress
- Check fuse(s) and any circuit breakers related to power windows
- Operate rear-right switch and master switch while observing behavior
- Listen for motor noise at the door when switch is operated
- Scan vehicle with diagnostic tool for B1422 and related codes; view live data for window module
- Inspect door grounding point and harness routing through door jamb (flex section) for broken wires
Signal parameters
- Supply voltage to motor connector when switch pressed: ~11–14 V (battery voltage) on feed side
- Ground reference: near 0 V at motor ground when switched
- Motor coil DC resistance: typically low (manufacturer-specific) — expect a low-ohm value; large or infinite resistance indicates open winding
- Stall/current draw: motor can draw several amps under load; significantly higher than normal indicates binding or shorted windings (use clamp meter)
- PWM control (if present): variable duty cycle control from module; frequency typically tens–hundreds of Hz (refer to manufacturer data)
Diagnostic algorithm
- Record freeze frame / conditions and note any other codes
- Perform visual inspection of connectors, wiring and motor for obvious damage or corrosion
- Check power/ground at the motor connector while operating switch: verify battery voltage on feed and ground switching to ~0 V
- Check continuity between motor connector and window control module/ground with harness flexed at door hinge to detect broken wires
- Check associated fuse(s) and replace if blown; observe if fuse blows again when operating window
- Apply direct 12 V and ground to motor (bench test) to verify motor operation; if motor runs properly off vehicle, wiring or control is suspect
- Measure motor current while operating. High current indicates binding or internal motor fault; low/no current with correct voltage indicates open/poor connection
- Inspect window regulator for mechanical binding; free the mechanism and retest motor
- If wiring and motor are good, test/replace switch(s) and, if required, the window control module/BCM following manufacturer procedures
- Clear code, retest operation through full range and cycle to confirm repair and monitor for recurrence
Likely causes
- Corroded connector at rear-right door causing intermittent contact
- Wiring chafed and shorting to ground when door is moved
- Motor internal failure or brushes worn causing open/short or excessive current draw
- Switch contacts worn or contaminated preventing motor activation
- Regulator binding causing motor stall and overcurrent
Fault status
Status
Body control system reports fault in rear-right electric window motor circuit — open/short/intermittent/overcurrent detected.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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