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Home / DTC / B1402 — Driver window opening circuit

B1402 — Driver window opening circuit

Detailed page for trouble code B1402.

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Code

B1402

ALFA ROMEO B — Body

Driver window opening circuit

Brand: ALFA ROMEO
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Broken or corroded wiring in driver door harness
  • Faulty driver door window switch
  • Defective window regulator motor
  • Poor or missing ground at door or chassis
  • Blown fuse or faulty relay for power windows
  • Water intrusion or corroded connector in door harness

Symptoms

  • Driver window will not open when using the driver door switch
  • Window operates intermittently or only from passenger switch
  • Unusual motor noise or no noise when commanding the window
  • Other windows operate normally (isolates to driver circuit)
  • Stored DTC and possibly an indicator/message on the dash

What to check

  • Scan tool: read DTCs, freeze frame and live data related to window circuits
  • Verify battery voltage (12–14 V) and check related fuses/relays
  • Operate driver window switch while listening for motor and watching live data
  • Inspect door wiring harness, connector, and pin condition (look for corrosion/wear at hinge area)
  • Backprobe switch and motor terminals to measure voltage and signal behavior during operation
  • Check ground continuity from door ground to chassis

Signal parameters

  • Battery supply at switch and motor: ~12–14 V when key on and circuit engaged
  • Switch output: toggles between battery voltage and ground depending on direction
  • Motor terminals: one side ~12 V, other ~0 V when driving one direction; reversed when commanding opposite
  • Motor stall current: can be several amps (typical 5–30 A depending on vehicle and condition)
  • Open-circuit: infinite resistance / no voltage at motor when switch pressed
  • Short-to-ground: near 0 V at output when not commanded; short-to-B+: near battery voltage

Diagnostic algorithm

  1. Connect scan tool, read and record DTC(s), clear codes and attempt to reproduce B1402.
  2. Confirm battery voltage is adequate. Check fuses/relays for power windows; replace if blown.
  3. Visually inspect driver door harness and connector (hinge area) for damaged conductors or corrosion.
  4. With door open, backprobe the driver switch input and output pins while operating the switch. Verify correct voltages and polarity change for open/close commands.
  5. Backprobe motor terminals at regulator and verify voltage is present when switch is operated. If voltage present but motor doesn’t run, suspect motor/regulator.
  6. If no voltage at motor, trace wiring back to switch/BCM: check continuity and for shorts to ground or battery.
  7. Check and measure ground continuity from motor/switch grounds to chassis.
  8. Measure motor resistance and current draw during operation (use proper fused ammeter). High current or no rotation indicates motor/regulator fault.
  9. Repair or replace damaged wiring/connectors, switch or motor as indicated. If wiring is repaired, secure harness at hinge to prevent reoccurrence.
  10. If electrical inputs and outputs around the BCM/door module look correct and wiring/switch/motor test good, suspect module fault — consult manufacturer procedures for module reprogramming or replacement.
  11. After repairs, clear codes and verify correct operation and that B1402 does not return. Confirm auto/one-touch window functions if equipped and perform relearn/initialization if required.

Likely causes

  • Open or shorted wire in driver door harness (most common)
  • Failed driver window switch (next most likely)
  • Worn or seized window motor/regulator
  • Poor ground or corroded door connector
  • Fuse or relay fault (less common)

Fault status

⚠️ Status
Electrical fault in driver window opening circuit detected — open/short/intermittent in driver door window control wiring, switch, motor, or related module. May prevent window from opening.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

B1400 B1401 B1403 B1404 B1405
89

Browse 89 ALFA ROMEO manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

ALFA ROMEO

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Code

B1402

FIAT B — Body

Driver window opening circuit

Brand: FIAT
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Broken or corroded wiring in driver door harness
  • Faulty driver door window switch
  • Defective window regulator motor
  • Poor or missing ground at door or chassis
  • Blown fuse or faulty relay for power windows
  • Water intrusion or corroded connector in door harness

Symptoms

  • Driver window will not open when using the driver door switch
  • Window operates intermittently or only from passenger switch
  • Unusual motor noise or no noise when commanding the window
  • Other windows operate normally (isolates to driver circuit)
  • Stored DTC and possibly an indicator/message on the dash

What to check

  • Scan tool: read DTCs, freeze frame and live data related to window circuits
  • Verify battery voltage (12–14 V) and check related fuses/relays
  • Operate driver window switch while listening for motor and watching live data
  • Inspect door wiring harness, connector, and pin condition (look for corrosion/wear at hinge area)
  • Backprobe switch and motor terminals to measure voltage and signal behavior during operation
  • Check ground continuity from door ground to chassis

Signal parameters

  • Battery supply at switch and motor: ~12–14 V when key on and circuit engaged
  • Switch output: toggles between battery voltage and ground depending on direction
  • Motor terminals: one side ~12 V, other ~0 V when driving one direction; reversed when commanding opposite
  • Motor stall current: can be several amps (typical 5–30 A depending on vehicle and condition)
  • Open-circuit: infinite resistance / no voltage at motor when switch pressed
  • Short-to-ground: near 0 V at output when not commanded; short-to-B+: near battery voltage

Diagnostic algorithm

  1. Connect scan tool, read and record DTC(s), clear codes and attempt to reproduce B1402.
  2. Confirm battery voltage is adequate. Check fuses/relays for power windows; replace if blown.
  3. Visually inspect driver door harness and connector (hinge area) for damaged conductors or corrosion.
  4. With door open, backprobe the driver switch input and output pins while operating the switch. Verify correct voltages and polarity change for open/close commands.
  5. Backprobe motor terminals at regulator and verify voltage is present when switch is operated. If voltage present but motor doesn’t run, suspect motor/regulator.
  6. If no voltage at motor, trace wiring back to switch/BCM: check continuity and for shorts to ground or battery.
  7. Check and measure ground continuity from motor/switch grounds to chassis.
  8. Measure motor resistance and current draw during operation (use proper fused ammeter). High current or no rotation indicates motor/regulator fault.
  9. Repair or replace damaged wiring/connectors, switch or motor as indicated. If wiring is repaired, secure harness at hinge to prevent reoccurrence.
  10. If electrical inputs and outputs around the BCM/door module look correct and wiring/switch/motor test good, suspect module fault — consult manufacturer procedures for module reprogramming or replacement.
  11. After repairs, clear codes and verify correct operation and that B1402 does not return. Confirm auto/one-touch window functions if equipped and perform relearn/initialization if required.

Likely causes

  • Open or shorted wire in driver door harness (most common)
  • Failed driver window switch (next most likely)
  • Worn or seized window motor/regulator
  • Poor ground or corroded door connector
  • Fuse or relay fault (less common)

Fault status

⚠️ Status
Electrical fault in driver window opening circuit detected — open/short/intermittent in driver door window control wiring, switch, motor, or related module. May prevent window from opening.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

B1400 B1401 B1403 B1404 B1405
Repair manuals

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Code

B1402

LAND ROVER B — Body

Window lift circuit failure of the local door

Brand: LAND ROVER
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Broken or corroded wiring in driver door harness
  • Faulty driver door window switch
  • Defective window regulator motor
  • Poor or missing ground at door or chassis
  • Blown fuse or faulty relay for power windows
  • Water intrusion or corroded connector in door harness

Symptoms

  • Driver window will not open when using the driver door switch
  • Window operates intermittently or only from passenger switch
  • Unusual motor noise or no noise when commanding the window
  • Other windows operate normally (isolates to driver circuit)
  • Stored DTC and possibly an indicator/message on the dash

What to check

  • Scan tool: read DTCs, freeze frame and live data related to window circuits
  • Verify battery voltage (12–14 V) and check related fuses/relays
  • Operate driver window switch while listening for motor and watching live data
  • Inspect door wiring harness, connector, and pin condition (look for corrosion/wear at hinge area)
  • Backprobe switch and motor terminals to measure voltage and signal behavior during operation
  • Check ground continuity from door ground to chassis

Signal parameters

  • Battery supply at switch and motor: ~12–14 V when key on and circuit engaged
  • Switch output: toggles between battery voltage and ground depending on direction
  • Motor terminals: one side ~12 V, other ~0 V when driving one direction; reversed when commanding opposite
  • Motor stall current: can be several amps (typical 5–30 A depending on vehicle and condition)
  • Open-circuit: infinite resistance / no voltage at motor when switch pressed
  • Short-to-ground: near 0 V at output when not commanded; short-to-B+: near battery voltage

Diagnostic algorithm

  1. Connect scan tool, read and record DTC(s), clear codes and attempt to reproduce B1402.
  2. Confirm battery voltage is adequate. Check fuses/relays for power windows; replace if blown.
  3. Visually inspect driver door harness and connector (hinge area) for damaged conductors or corrosion.
  4. With door open, backprobe the driver switch input and output pins while operating the switch. Verify correct voltages and polarity change for open/close commands.
  5. Backprobe motor terminals at regulator and verify voltage is present when switch is operated. If voltage present but motor doesn’t run, suspect motor/regulator.
  6. If no voltage at motor, trace wiring back to switch/BCM: check continuity and for shorts to ground or battery.
  7. Check and measure ground continuity from motor/switch grounds to chassis.
  8. Measure motor resistance and current draw during operation (use proper fused ammeter). High current or no rotation indicates motor/regulator fault.
  9. Repair or replace damaged wiring/connectors, switch or motor as indicated. If wiring is repaired, secure harness at hinge to prevent reoccurrence.
  10. If electrical inputs and outputs around the BCM/door module look correct and wiring/switch/motor test good, suspect module fault — consult manufacturer procedures for module reprogramming or replacement.
  11. After repairs, clear codes and verify correct operation and that B1402 does not return. Confirm auto/one-touch window functions if equipped and perform relearn/initialization if required.

Likely causes

  • Open or shorted wire in driver door harness (most common)
  • Failed driver window switch (next most likely)
  • Worn or seized window motor/regulator
  • Poor ground or corroded door connector
  • Fuse or relay fault (less common)

Fault status

⚠️ Status
Electrical fault in driver window opening circuit detected — open/short/intermittent in driver door window control wiring, switch, motor, or related module. May prevent window from opening.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

B1400 B1401 B1403 B1404 B1405
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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Code

B1402

MITSUBISHI B — Body

F ABG(1)DR.squib grounding

Brand: MITSUBISHI
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Broken or corroded wiring in driver door harness
  • Faulty driver door window switch
  • Defective window regulator motor
  • Poor or missing ground at door or chassis
  • Blown fuse or faulty relay for power windows
  • Water intrusion or corroded connector in door harness

Symptoms

  • Driver window will not open when using the driver door switch
  • Window operates intermittently or only from passenger switch
  • Unusual motor noise or no noise when commanding the window
  • Other windows operate normally (isolates to driver circuit)
  • Stored DTC and possibly an indicator/message on the dash

What to check

  • Scan tool: read DTCs, freeze frame and live data related to window circuits
  • Verify battery voltage (12–14 V) and check related fuses/relays
  • Operate driver window switch while listening for motor and watching live data
  • Inspect door wiring harness, connector, and pin condition (look for corrosion/wear at hinge area)
  • Backprobe switch and motor terminals to measure voltage and signal behavior during operation
  • Check ground continuity from door ground to chassis

Signal parameters

  • Battery supply at switch and motor: ~12–14 V when key on and circuit engaged
  • Switch output: toggles between battery voltage and ground depending on direction
  • Motor terminals: one side ~12 V, other ~0 V when driving one direction; reversed when commanding opposite
  • Motor stall current: can be several amps (typical 5–30 A depending on vehicle and condition)
  • Open-circuit: infinite resistance / no voltage at motor when switch pressed
  • Short-to-ground: near 0 V at output when not commanded; short-to-B+: near battery voltage

Diagnostic algorithm

  1. Connect scan tool, read and record DTC(s), clear codes and attempt to reproduce B1402.
  2. Confirm battery voltage is adequate. Check fuses/relays for power windows; replace if blown.
  3. Visually inspect driver door harness and connector (hinge area) for damaged conductors or corrosion.
  4. With door open, backprobe the driver switch input and output pins while operating the switch. Verify correct voltages and polarity change for open/close commands.
  5. Backprobe motor terminals at regulator and verify voltage is present when switch is operated. If voltage present but motor doesn’t run, suspect motor/regulator.
  6. If no voltage at motor, trace wiring back to switch/BCM: check continuity and for shorts to ground or battery.
  7. Check and measure ground continuity from motor/switch grounds to chassis.
  8. Measure motor resistance and current draw during operation (use proper fused ammeter). High current or no rotation indicates motor/regulator fault.
  9. Repair or replace damaged wiring/connectors, switch or motor as indicated. If wiring is repaired, secure harness at hinge to prevent reoccurrence.
  10. If electrical inputs and outputs around the BCM/door module look correct and wiring/switch/motor test good, suspect module fault — consult manufacturer procedures for module reprogramming or replacement.
  11. After repairs, clear codes and verify correct operation and that B1402 does not return. Confirm auto/one-touch window functions if equipped and perform relearn/initialization if required.

Likely causes

  • Open or shorted wire in driver door harness (most common)
  • Failed driver window switch (next most likely)
  • Worn or seized window motor/regulator
  • Poor ground or corroded door connector
  • Fuse or relay fault (less common)

Fault status

⚠️ Status
Electrical fault in driver window opening circuit detected — open/short/intermittent in driver door window control wiring, switch, motor, or related module. May prevent window from opening.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

B1400 B1401 B1403 B1404 B1405
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MITSUBISHI

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

B1402

Other B — Body

Driver Power Window Down Switch Circuit Failure

Brand: Other
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Broken or corroded wiring in driver door harness
  • Faulty driver door window switch
  • Defective window regulator motor
  • Poor or missing ground at door or chassis
  • Blown fuse or faulty relay for power windows
  • Water intrusion or corroded connector in door harness

Symptoms

  • Driver window will not open when using the driver door switch
  • Window operates intermittently or only from passenger switch
  • Unusual motor noise or no noise when commanding the window
  • Other windows operate normally (isolates to driver circuit)
  • Stored DTC and possibly an indicator/message on the dash

What to check

  • Scan tool: read DTCs, freeze frame and live data related to window circuits
  • Verify battery voltage (12–14 V) and check related fuses/relays
  • Operate driver window switch while listening for motor and watching live data
  • Inspect door wiring harness, connector, and pin condition (look for corrosion/wear at hinge area)
  • Backprobe switch and motor terminals to measure voltage and signal behavior during operation
  • Check ground continuity from door ground to chassis

Signal parameters

  • Battery supply at switch and motor: ~12–14 V when key on and circuit engaged
  • Switch output: toggles between battery voltage and ground depending on direction
  • Motor terminals: one side ~12 V, other ~0 V when driving one direction; reversed when commanding opposite
  • Motor stall current: can be several amps (typical 5–30 A depending on vehicle and condition)
  • Open-circuit: infinite resistance / no voltage at motor when switch pressed
  • Short-to-ground: near 0 V at output when not commanded; short-to-B+: near battery voltage

Diagnostic algorithm

  1. Connect scan tool, read and record DTC(s), clear codes and attempt to reproduce B1402.
  2. Confirm battery voltage is adequate. Check fuses/relays for power windows; replace if blown.
  3. Visually inspect driver door harness and connector (hinge area) for damaged conductors or corrosion.
  4. With door open, backprobe the driver switch input and output pins while operating the switch. Verify correct voltages and polarity change for open/close commands.
  5. Backprobe motor terminals at regulator and verify voltage is present when switch is operated. If voltage present but motor doesn’t run, suspect motor/regulator.
  6. If no voltage at motor, trace wiring back to switch/BCM: check continuity and for shorts to ground or battery.
  7. Check and measure ground continuity from motor/switch grounds to chassis.
  8. Measure motor resistance and current draw during operation (use proper fused ammeter). High current or no rotation indicates motor/regulator fault.
  9. Repair or replace damaged wiring/connectors, switch or motor as indicated. If wiring is repaired, secure harness at hinge to prevent reoccurrence.
  10. If electrical inputs and outputs around the BCM/door module look correct and wiring/switch/motor test good, suspect module fault — consult manufacturer procedures for module reprogramming or replacement.
  11. After repairs, clear codes and verify correct operation and that B1402 does not return. Confirm auto/one-touch window functions if equipped and perform relearn/initialization if required.

Likely causes

  • Open or shorted wire in driver door harness (most common)
  • Failed driver window switch (next most likely)
  • Worn or seized window motor/regulator
  • Poor ground or corroded door connector
  • Fuse or relay fault (less common)

Fault status

⚠️ Status
Electrical fault in driver window opening circuit detected — open/short/intermittent in driver door window control wiring, switch, motor, or related module. May prevent window from opening.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

B1400 B1401 B1403 B1404 B1405
8,762

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