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Home / DTC / B1439 — Wiper mode selection switch open circuit

B1439 — Wiper mode selection switch open circuit

Detailed page for trouble code B1439.

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22,491specific
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Code

B1439

ALFA ROMEO B — Body

Wiper mode selection switch open circuit

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

Causes

  • Broken or disconnected wiring between wiper mode switch and BCM
  • Corroded, bent or loose connector pins at switch or BCM
  • Failed wiper mode selector switch (mechanical/electrical failure)
  • Open fuse or poor power/ground for switch or BCM
  • Intermittent or lost communication on vehicle network (CAN LIN)
  • Faulty BCM or input circuit failure

Symptoms

  • Wipers do not change speed or mode when switch is operated
  • Intermittent or complete loss of wiper functions (wash, intermittent, low, high)
  • Instrument cluster or message indicating service required for wipers
  • Related switch controls (e.g., wash) unresponsive while motor may still run in some modes
  • DTC B1439 stored and possibly other body network communication DTCs

What to check

  • Scan vehicle for B1439 and any related DTCs; note freeze-frame and event counts
  • Visually inspect the wiper mode switch, stalk, connectors and wiring for damage or corrosion
  • Check fuses and power/ground feeding the switch and BCM
  • Operate the switch while monitoring live data or communication messages for the wiper selector input
  • Perform continuity and resistance checks from the switch pins to the BCM connector pins with ignition OFF
  • Backprobe the switch connector with ignition ON to measure expected voltages or switching voltages

Signal parameters

  • Switch output: normally toggles between 0 V (ground) and battery voltage (~12 V) or between defined resistance steps — OEM values required
  • Expected continuity: closed circuits in selected positions, open in others — consult wiring diagram for pin-to-pin mapping
  • Live data: wiper mode selection parameter should change when stalk is moved
  • CAN/LIN: wiper switch message should be present on bus; loss of message indicates wiring/network or module fault
  • Resistance: some multi-position switches present characteristic resistances per position — compare to factory specs

Diagnostic algorithm

  1. Read and record all stored DTCs and freeze-frame data. Clear codes and re-test to confirm reproducibility.
  2. Inspect fuses and the power/ground at the switch and control module. Repair any blown fuses or poor grounds.
  3. Visually inspect switch, connectors and harness (steering column area) for damage, corrosion or loose terminals. Repair as necessary.
  4. With ignition ON, backprobe the switch connector and operate the stalk. Measure voltage on signal pins — verify toggling between expected states (0 V/12 V or specified levels).
  5. With ignition OFF, disconnect battery if required by service manual, then check continuity and resistance between switch terminals and BCM input terminals to identify open circuits or high resistance.
  6. If wiring and connectors are good, bench-test or substitute a known-good switch (if available) to verify switch operation.
  7. If switch and wiring verify OK but input not seen at BCM, check for CAN/LIN messages and communication errors. Use scope or CAN tool to confirm.
  8. If communication is present but BCM input is dead, consider BCM input driver fault and consult manufacturer procedures for BCM testing or replacement.
  9. After repairs, clear codes and verify correct operation of all wiper modes through full function test and road test.

Likely causes

  • Worn or contaminated switch contacts inside the stalk/switch
  • Damaged wiring harness (chafed, pinched, or broken wires)
  • Connector corrosion or pushed-out terminal at steering column or BCM
  • Blown fuse supplying switch or control module
  • Fault in BCM input driver if wiring and switch test good

Fault status

⚠️ Status
Wiper mode selection switch open circuit detected. Check switch, wiring, connectors, fuses and module communication before replacement.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 1.5 hours

Similar codes

B1438 B1440 B1260 U0073 U0100
89

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

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Code

B1439

FIAT B — Body

Wiper mode selection switch open circuit

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

Causes

  • Broken or disconnected wiring between wiper mode switch and BCM
  • Corroded, bent or loose connector pins at switch or BCM
  • Failed wiper mode selector switch (mechanical/electrical failure)
  • Open fuse or poor power/ground for switch or BCM
  • Intermittent or lost communication on vehicle network (CAN LIN)
  • Faulty BCM or input circuit failure

Symptoms

  • Wipers do not change speed or mode when switch is operated
  • Intermittent or complete loss of wiper functions (wash, intermittent, low, high)
  • Instrument cluster or message indicating service required for wipers
  • Related switch controls (e.g., wash) unresponsive while motor may still run in some modes
  • DTC B1439 stored and possibly other body network communication DTCs

What to check

  • Scan vehicle for B1439 and any related DTCs; note freeze-frame and event counts
  • Visually inspect the wiper mode switch, stalk, connectors and wiring for damage or corrosion
  • Check fuses and power/ground feeding the switch and BCM
  • Operate the switch while monitoring live data or communication messages for the wiper selector input
  • Perform continuity and resistance checks from the switch pins to the BCM connector pins with ignition OFF
  • Backprobe the switch connector with ignition ON to measure expected voltages or switching voltages

Signal parameters

  • Switch output: normally toggles between 0 V (ground) and battery voltage (~12 V) or between defined resistance steps — OEM values required
  • Expected continuity: closed circuits in selected positions, open in others — consult wiring diagram for pin-to-pin mapping
  • Live data: wiper mode selection parameter should change when stalk is moved
  • CAN/LIN: wiper switch message should be present on bus; loss of message indicates wiring/network or module fault
  • Resistance: some multi-position switches present characteristic resistances per position — compare to factory specs

Diagnostic algorithm

  1. Read and record all stored DTCs and freeze-frame data. Clear codes and re-test to confirm reproducibility.
  2. Inspect fuses and the power/ground at the switch and control module. Repair any blown fuses or poor grounds.
  3. Visually inspect switch, connectors and harness (steering column area) for damage, corrosion or loose terminals. Repair as necessary.
  4. With ignition ON, backprobe the switch connector and operate the stalk. Measure voltage on signal pins — verify toggling between expected states (0 V/12 V or specified levels).
  5. With ignition OFF, disconnect battery if required by service manual, then check continuity and resistance between switch terminals and BCM input terminals to identify open circuits or high resistance.
  6. If wiring and connectors are good, bench-test or substitute a known-good switch (if available) to verify switch operation.
  7. If switch and wiring verify OK but input not seen at BCM, check for CAN/LIN messages and communication errors. Use scope or CAN tool to confirm.
  8. If communication is present but BCM input is dead, consider BCM input driver fault and consult manufacturer procedures for BCM testing or replacement.
  9. After repairs, clear codes and verify correct operation of all wiper modes through full function test and road test.

Likely causes

  • Worn or contaminated switch contacts inside the stalk/switch
  • Damaged wiring harness (chafed, pinched, or broken wires)
  • Connector corrosion or pushed-out terminal at steering column or BCM
  • Blown fuse supplying switch or control module
  • Fault in BCM input driver if wiring and switch test good

Fault status

⚠️ Status
Wiper mode selection switch open circuit detected. Check switch, wiring, connectors, fuses and module communication before replacement.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 1.5 hours

Similar codes

B1438 B1440 B1260 U0073 U0100
Repair manuals

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Code

B1439

LAND ROVER B — Body

Windshield wiper mode selection switch - open circuit

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

Causes

  • Broken or disconnected wiring between wiper mode switch and BCM
  • Corroded, bent or loose connector pins at switch or BCM
  • Failed wiper mode selector switch (mechanical/electrical failure)
  • Open fuse or poor power/ground for switch or BCM
  • Intermittent or lost communication on vehicle network (CAN LIN)
  • Faulty BCM or input circuit failure

Symptoms

  • Wipers do not change speed or mode when switch is operated
  • Intermittent or complete loss of wiper functions (wash, intermittent, low, high)
  • Instrument cluster or message indicating service required for wipers
  • Related switch controls (e.g., wash) unresponsive while motor may still run in some modes
  • DTC B1439 stored and possibly other body network communication DTCs

What to check

  • Scan vehicle for B1439 and any related DTCs; note freeze-frame and event counts
  • Visually inspect the wiper mode switch, stalk, connectors and wiring for damage or corrosion
  • Check fuses and power/ground feeding the switch and BCM
  • Operate the switch while monitoring live data or communication messages for the wiper selector input
  • Perform continuity and resistance checks from the switch pins to the BCM connector pins with ignition OFF
  • Backprobe the switch connector with ignition ON to measure expected voltages or switching voltages

Signal parameters

  • Switch output: normally toggles between 0 V (ground) and battery voltage (~12 V) or between defined resistance steps — OEM values required
  • Expected continuity: closed circuits in selected positions, open in others — consult wiring diagram for pin-to-pin mapping
  • Live data: wiper mode selection parameter should change when stalk is moved
  • CAN/LIN: wiper switch message should be present on bus; loss of message indicates wiring/network or module fault
  • Resistance: some multi-position switches present characteristic resistances per position — compare to factory specs

Diagnostic algorithm

  1. Read and record all stored DTCs and freeze-frame data. Clear codes and re-test to confirm reproducibility.
  2. Inspect fuses and the power/ground at the switch and control module. Repair any blown fuses or poor grounds.
  3. Visually inspect switch, connectors and harness (steering column area) for damage, corrosion or loose terminals. Repair as necessary.
  4. With ignition ON, backprobe the switch connector and operate the stalk. Measure voltage on signal pins — verify toggling between expected states (0 V/12 V or specified levels).
  5. With ignition OFF, disconnect battery if required by service manual, then check continuity and resistance between switch terminals and BCM input terminals to identify open circuits or high resistance.
  6. If wiring and connectors are good, bench-test or substitute a known-good switch (if available) to verify switch operation.
  7. If switch and wiring verify OK but input not seen at BCM, check for CAN/LIN messages and communication errors. Use scope or CAN tool to confirm.
  8. If communication is present but BCM input is dead, consider BCM input driver fault and consult manufacturer procedures for BCM testing or replacement.
  9. After repairs, clear codes and verify correct operation of all wiper modes through full function test and road test.

Likely causes

  • Worn or contaminated switch contacts inside the stalk/switch
  • Damaged wiring harness (chafed, pinched, or broken wires)
  • Connector corrosion or pushed-out terminal at steering column or BCM
  • Blown fuse supplying switch or control module
  • Fault in BCM input driver if wiring and switch test good

Fault status

⚠️ Status
Wiper mode selection switch open circuit detected. Check switch, wiring, connectors, fuses and module communication before replacement.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 1.5 hours

Similar codes

B1438 B1440 B1260 U0073 U0100
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

B1439

MITSUBISHI B — Body

FL side impact sensor No COM.

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

Causes

  • Broken or disconnected wiring between wiper mode switch and BCM
  • Corroded, bent or loose connector pins at switch or BCM
  • Failed wiper mode selector switch (mechanical/electrical failure)
  • Open fuse or poor power/ground for switch or BCM
  • Intermittent or lost communication on vehicle network (CAN LIN)
  • Faulty BCM or input circuit failure

Symptoms

  • Wipers do not change speed or mode when switch is operated
  • Intermittent or complete loss of wiper functions (wash, intermittent, low, high)
  • Instrument cluster or message indicating service required for wipers
  • Related switch controls (e.g., wash) unresponsive while motor may still run in some modes
  • DTC B1439 stored and possibly other body network communication DTCs

What to check

  • Scan vehicle for B1439 and any related DTCs; note freeze-frame and event counts
  • Visually inspect the wiper mode switch, stalk, connectors and wiring for damage or corrosion
  • Check fuses and power/ground feeding the switch and BCM
  • Operate the switch while monitoring live data or communication messages for the wiper selector input
  • Perform continuity and resistance checks from the switch pins to the BCM connector pins with ignition OFF
  • Backprobe the switch connector with ignition ON to measure expected voltages or switching voltages

Signal parameters

  • Switch output: normally toggles between 0 V (ground) and battery voltage (~12 V) or between defined resistance steps — OEM values required
  • Expected continuity: closed circuits in selected positions, open in others — consult wiring diagram for pin-to-pin mapping
  • Live data: wiper mode selection parameter should change when stalk is moved
  • CAN/LIN: wiper switch message should be present on bus; loss of message indicates wiring/network or module fault
  • Resistance: some multi-position switches present characteristic resistances per position — compare to factory specs

Diagnostic algorithm

  1. Read and record all stored DTCs and freeze-frame data. Clear codes and re-test to confirm reproducibility.
  2. Inspect fuses and the power/ground at the switch and control module. Repair any blown fuses or poor grounds.
  3. Visually inspect switch, connectors and harness (steering column area) for damage, corrosion or loose terminals. Repair as necessary.
  4. With ignition ON, backprobe the switch connector and operate the stalk. Measure voltage on signal pins — verify toggling between expected states (0 V/12 V or specified levels).
  5. With ignition OFF, disconnect battery if required by service manual, then check continuity and resistance between switch terminals and BCM input terminals to identify open circuits or high resistance.
  6. If wiring and connectors are good, bench-test or substitute a known-good switch (if available) to verify switch operation.
  7. If switch and wiring verify OK but input not seen at BCM, check for CAN/LIN messages and communication errors. Use scope or CAN tool to confirm.
  8. If communication is present but BCM input is dead, consider BCM input driver fault and consult manufacturer procedures for BCM testing or replacement.
  9. After repairs, clear codes and verify correct operation of all wiper modes through full function test and road test.

Likely causes

  • Worn or contaminated switch contacts inside the stalk/switch
  • Damaged wiring harness (chafed, pinched, or broken wires)
  • Connector corrosion or pushed-out terminal at steering column or BCM
  • Blown fuse supplying switch or control module
  • Fault in BCM input driver if wiring and switch test good

Fault status

⚠️ Status
Wiper mode selection switch open circuit detected. Check switch, wiring, connectors, fuses and module communication before replacement.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 1.5 hours

Similar codes

B1438 B1440 B1260 U0073 U0100
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

B1439

Other B — Body

Wiper Mode Select Switch Circuit Open

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

Causes

  • Broken or disconnected wiring between wiper mode switch and BCM
  • Corroded, bent or loose connector pins at switch or BCM
  • Failed wiper mode selector switch (mechanical/electrical failure)
  • Open fuse or poor power/ground for switch or BCM
  • Intermittent or lost communication on vehicle network (CAN LIN)
  • Faulty BCM or input circuit failure

Symptoms

  • Wipers do not change speed or mode when switch is operated
  • Intermittent or complete loss of wiper functions (wash, intermittent, low, high)
  • Instrument cluster or message indicating service required for wipers
  • Related switch controls (e.g., wash) unresponsive while motor may still run in some modes
  • DTC B1439 stored and possibly other body network communication DTCs

What to check

  • Scan vehicle for B1439 and any related DTCs; note freeze-frame and event counts
  • Visually inspect the wiper mode switch, stalk, connectors and wiring for damage or corrosion
  • Check fuses and power/ground feeding the switch and BCM
  • Operate the switch while monitoring live data or communication messages for the wiper selector input
  • Perform continuity and resistance checks from the switch pins to the BCM connector pins with ignition OFF
  • Backprobe the switch connector with ignition ON to measure expected voltages or switching voltages

Signal parameters

  • Switch output: normally toggles between 0 V (ground) and battery voltage (~12 V) or between defined resistance steps — OEM values required
  • Expected continuity: closed circuits in selected positions, open in others — consult wiring diagram for pin-to-pin mapping
  • Live data: wiper mode selection parameter should change when stalk is moved
  • CAN/LIN: wiper switch message should be present on bus; loss of message indicates wiring/network or module fault
  • Resistance: some multi-position switches present characteristic resistances per position — compare to factory specs

Diagnostic algorithm

  1. Read and record all stored DTCs and freeze-frame data. Clear codes and re-test to confirm reproducibility.
  2. Inspect fuses and the power/ground at the switch and control module. Repair any blown fuses or poor grounds.
  3. Visually inspect switch, connectors and harness (steering column area) for damage, corrosion or loose terminals. Repair as necessary.
  4. With ignition ON, backprobe the switch connector and operate the stalk. Measure voltage on signal pins — verify toggling between expected states (0 V/12 V or specified levels).
  5. With ignition OFF, disconnect battery if required by service manual, then check continuity and resistance between switch terminals and BCM input terminals to identify open circuits or high resistance.
  6. If wiring and connectors are good, bench-test or substitute a known-good switch (if available) to verify switch operation.
  7. If switch and wiring verify OK but input not seen at BCM, check for CAN/LIN messages and communication errors. Use scope or CAN tool to confirm.
  8. If communication is present but BCM input is dead, consider BCM input driver fault and consult manufacturer procedures for BCM testing or replacement.
  9. After repairs, clear codes and verify correct operation of all wiper modes through full function test and road test.

Likely causes

  • Worn or contaminated switch contacts inside the stalk/switch
  • Damaged wiring harness (chafed, pinched, or broken wires)
  • Connector corrosion or pushed-out terminal at steering column or BCM
  • Blown fuse supplying switch or control module
  • Fault in BCM input driver if wiring and switch test good

Fault status

⚠️ Status
Wiper mode selection switch open circuit detected. Check switch, wiring, connectors, fuses and module communication before replacement.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 1.5 hours

Similar codes

B1438 B1440 B1260 U0073 U0100
8,085

The library contains 8,085 repair and diagnostic manuals. Choose a brand to open the full manual tree by year, model and trim.

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89
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403
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86
LAND ROVER
320
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280
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296
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406
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58
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