Code
B1402
ALFA ROMEO
B — Body
Driver window opening circuit
Views:
UK: 3
EN: 5
RU: 14
AI status
Completed
Completed
100%
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
- Connect scan tool, read and record DTC(s), clear codes and attempt to reproduce B1402.
- Confirm battery voltage is adequate. Check fuses/relays for power windows; replace if blown.
- Visually inspect driver door harness and connector (hinge area) for damaged conductors or corrosion.
- 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.
- 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.
- If no voltage at motor, trace wiring back to switch/BCM: check continuity and for shorts to ground or battery.
- Check and measure ground continuity from motor/switch grounds to chassis.
- Measure motor resistance and current draw during operation (use proper fused ammeter). High current or no rotation indicates motor/regulator fault.
- Repair or replace damaged wiring/connectors, switch or motor as indicated. If wiring is repaired, secure harness at hinge to prevent reoccurrence.
- 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.
- 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
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Code
B1402
FIAT
B — Body
Driver window opening circuit
Views:
UK: 3
EN: 5
RU: 15
AI status
Completed
Completed
100%
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
- Connect scan tool, read and record DTC(s), clear codes and attempt to reproduce B1402.
- Confirm battery voltage is adequate. Check fuses/relays for power windows; replace if blown.
- Visually inspect driver door harness and connector (hinge area) for damaged conductors or corrosion.
- 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.
- 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.
- If no voltage at motor, trace wiring back to switch/BCM: check continuity and for shorts to ground or battery.
- Check and measure ground continuity from motor/switch grounds to chassis.
- Measure motor resistance and current draw during operation (use proper fused ammeter). High current or no rotation indicates motor/regulator fault.
- Repair or replace damaged wiring/connectors, switch or motor as indicated. If wiring is repaired, secure harness at hinge to prevent reoccurrence.
- 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.
- 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
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Code
B1402
LAND ROVER
B — Body
Window lift circuit failure of the local door
Views:
UK: 3
EN: 7
RU: 27
AI status
Completed
Completed
100%
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
- Connect scan tool, read and record DTC(s), clear codes and attempt to reproduce B1402.
- Confirm battery voltage is adequate. Check fuses/relays for power windows; replace if blown.
- Visually inspect driver door harness and connector (hinge area) for damaged conductors or corrosion.
- 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.
- 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.
- If no voltage at motor, trace wiring back to switch/BCM: check continuity and for shorts to ground or battery.
- Check and measure ground continuity from motor/switch grounds to chassis.
- Measure motor resistance and current draw during operation (use proper fused ammeter). High current or no rotation indicates motor/regulator fault.
- Repair or replace damaged wiring/connectors, switch or motor as indicated. If wiring is repaired, secure harness at hinge to prevent reoccurrence.
- 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.
- 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
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Code
B1402
MITSUBISHI
B — Body
F ABG(1)DR.squib grounding
Views:
UK: 7
EN: 9
RU: 37
AI status
Completed
Completed
100%
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
- Connect scan tool, read and record DTC(s), clear codes and attempt to reproduce B1402.
- Confirm battery voltage is adequate. Check fuses/relays for power windows; replace if blown.
- Visually inspect driver door harness and connector (hinge area) for damaged conductors or corrosion.
- 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.
- 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.
- If no voltage at motor, trace wiring back to switch/BCM: check continuity and for shorts to ground or battery.
- Check and measure ground continuity from motor/switch grounds to chassis.
- Measure motor resistance and current draw during operation (use proper fused ammeter). High current or no rotation indicates motor/regulator fault.
- Repair or replace damaged wiring/connectors, switch or motor as indicated. If wiring is repaired, secure harness at hinge to prevent reoccurrence.
- 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.
- 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
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Send to email
Code
B1402
Other
B — Body
Driver Power Window Down Switch Circuit Failure
Views:
UK: 15
EN: 29
RU: 51
AI status
Completed
Completed
100%
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
- Connect scan tool, read and record DTC(s), clear codes and attempt to reproduce B1402.
- Confirm battery voltage is adequate. Check fuses/relays for power windows; replace if blown.
- Visually inspect driver door harness and connector (hinge area) for damaged conductors or corrosion.
- 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.
- 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.
- If no voltage at motor, trace wiring back to switch/BCM: check continuity and for shorts to ground or battery.
- Check and measure ground continuity from motor/switch grounds to chassis.
- Measure motor resistance and current draw during operation (use proper fused ammeter). High current or no rotation indicates motor/regulator fault.
- Repair or replace damaged wiring/connectors, switch or motor as indicated. If wiring is repaired, secure harness at hinge to prevent reoccurrence.
- 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.
- 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
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
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👍 Like
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0
Send to email