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Home / DTC / B1459 — Relay coil of the washer pump motor / windshield wiper - open circuit

B1459 — Relay coil of the washer pump motor / windshield wiper - open circuit

Detailed page for trouble code B1459.

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Code

B1459

LAND ROVER B — Body

Relay coil of the washer pump motor / windshield wiper - open circuit

Brand: LAND ROVER
Type: B — Body
Views: UK: 13 EN: 14 RU: 10
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or broken wiring in the relay coil circuit
  • Failed (open) relay coil
  • Poor or corroded connector at the relay or ground
  • Blown or missing fuse in the circuit feeding the relay coil
  • Faulty body control module (BCM) / relay driver (less common)

Symptoms

  • Washer pump does not operate when switch is pressed
  • Windshield wipers may not operate (if same relay is used)
  • Intermittent or no response from washer/wiper controls
  • Related dashboard message or lamp may illuminate
  • Stored B1459 fault code and possibly related codes

What to check

  • Retrieve fault codes and freeze frame data with a diagnostic scanner
  • Visually inspect relay, socket, fuse(s) and harness for damage or corrosion
  • Check for presence and condition of related fuses
  • Swap relay with an identical known-good relay (if available) and re-test
  • Measure voltage and continuity at relay socket with control activated

Signal parameters

  • Nominal relay coil supply: ~12 V when relay driver supplies power (vehicle battery voltage)
  • Relay coil resistance (typical): ~50–200 ohms (manufacturer-specific)
  • Control signal type: switched positive or switched ground from BCM (verify vehicle-specific)
  • Expected voltage at coil control pin when activated: ~12 V (or near 0 V if switched to ground)
  • No continuity (infinite ohms) across coil terminals indicates open coil

Diagnostic algorithm

  1. Confirm the B1459 code and note any additional related codes. Clear codes and attempt to reproduce the fault.
  2. Check fuses for the washer/wiper relay circuits; replace any blown fuses and retest.
  3. Locate the washer pump/wiper relay and visually inspect relay and socket for corrosion, bent pins, or water ingress. Secure any loose connections.
  4. Swap the suspect relay with an identical, known-good relay from the vehicle (e.g., a non-critical circuit) and check whether the function is restored and the code clears.
  5. If swapping is inconclusive, remove the relay and measure coil resistance with an ohmmeter across the coil pins. An open reading (OL/infinite) indicates a failed relay coil — replace relay.
  6. With the relay unplugged, use a lab scope or multimeter to check for the correct control voltage at the relay socket while operating the washer/wiper switch. Verify whether the BCM is commanding the relay.
  7. Perform continuity checks between the relay socket and the BCM/ground point to find open wires or poor connections. Repair or repair/replace damaged wiring or connectors.
  8. After repairs, reassemble, clear codes, and cycle the washer/wiper system multiple times to confirm no return of the fault and that operation is normal.
  9. If wiring, relay and fuses are good but no control signal is present, investigate the BCM/relay driver circuit or consult manufacturer guidance for module-level diagnostics.

Likely causes

  • Relay coil has failed (open winding)
  • Corroded or disconnected relay socket terminal
  • Broken conductor between module and relay socket (pin or splice failure)
  • Blown fuse supplying relay coil
  • Intermittent connection due to water ingress or damaged insulation

Fault status

⚠️ Status
Open circuit detected in relay coil for washer pump motor / windshield wiper. Check relay, fuse, wiring and module connections (B1459).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1458 B1460 B1461 B1234 B1235
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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Code

B1459

MERCEDES-BENZ B — Body

Series interface (K2) connection to instrument cluster (A1)

Brand: MERCEDES-BENZ
Type: B — Body
Views: UK: 11 EN: 23 RU: 16
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or broken wiring in the relay coil circuit
  • Failed (open) relay coil
  • Poor or corroded connector at the relay or ground
  • Blown or missing fuse in the circuit feeding the relay coil
  • Faulty body control module (BCM) / relay driver (less common)

Symptoms

  • Washer pump does not operate when switch is pressed
  • Windshield wipers may not operate (if same relay is used)
  • Intermittent or no response from washer/wiper controls
  • Related dashboard message or lamp may illuminate
  • Stored B1459 fault code and possibly related codes

What to check

  • Retrieve fault codes and freeze frame data with a diagnostic scanner
  • Visually inspect relay, socket, fuse(s) and harness for damage or corrosion
  • Check for presence and condition of related fuses
  • Swap relay with an identical known-good relay (if available) and re-test
  • Measure voltage and continuity at relay socket with control activated

Signal parameters

  • Nominal relay coil supply: ~12 V when relay driver supplies power (vehicle battery voltage)
  • Relay coil resistance (typical): ~50–200 ohms (manufacturer-specific)
  • Control signal type: switched positive or switched ground from BCM (verify vehicle-specific)
  • Expected voltage at coil control pin when activated: ~12 V (or near 0 V if switched to ground)
  • No continuity (infinite ohms) across coil terminals indicates open coil

Diagnostic algorithm

  1. Confirm the B1459 code and note any additional related codes. Clear codes and attempt to reproduce the fault.
  2. Check fuses for the washer/wiper relay circuits; replace any blown fuses and retest.
  3. Locate the washer pump/wiper relay and visually inspect relay and socket for corrosion, bent pins, or water ingress. Secure any loose connections.
  4. Swap the suspect relay with an identical, known-good relay from the vehicle (e.g., a non-critical circuit) and check whether the function is restored and the code clears.
  5. If swapping is inconclusive, remove the relay and measure coil resistance with an ohmmeter across the coil pins. An open reading (OL/infinite) indicates a failed relay coil — replace relay.
  6. With the relay unplugged, use a lab scope or multimeter to check for the correct control voltage at the relay socket while operating the washer/wiper switch. Verify whether the BCM is commanding the relay.
  7. Perform continuity checks between the relay socket and the BCM/ground point to find open wires or poor connections. Repair or repair/replace damaged wiring or connectors.
  8. After repairs, reassemble, clear codes, and cycle the washer/wiper system multiple times to confirm no return of the fault and that operation is normal.
  9. If wiring, relay and fuses are good but no control signal is present, investigate the BCM/relay driver circuit or consult manufacturer guidance for module-level diagnostics.

Likely causes

  • Relay coil has failed (open winding)
  • Corroded or disconnected relay socket terminal
  • Broken conductor between module and relay socket (pin or splice failure)
  • Blown fuse supplying relay coil
  • Intermittent connection due to water ingress or damaged insulation

Fault status

⚠️ Status
Open circuit detected in relay coil for washer pump motor / windshield wiper. Check relay, fuse, wiring and module connections (B1459).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1458 B1460 B1461 B1234 B1235
610

Browse 610 MERCEDES-BENZ manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MERCEDES-BENZ

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Code

B1459

MITSUBISHI B — Body

RL side impact sensor No COM.

Brand: MITSUBISHI
Type: B — Body
Views: UK: 16 EN: 21 RU: 15
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or broken wiring in the relay coil circuit
  • Failed (open) relay coil
  • Poor or corroded connector at the relay or ground
  • Blown or missing fuse in the circuit feeding the relay coil
  • Faulty body control module (BCM) / relay driver (less common)

Symptoms

  • Washer pump does not operate when switch is pressed
  • Windshield wipers may not operate (if same relay is used)
  • Intermittent or no response from washer/wiper controls
  • Related dashboard message or lamp may illuminate
  • Stored B1459 fault code and possibly related codes

What to check

  • Retrieve fault codes and freeze frame data with a diagnostic scanner
  • Visually inspect relay, socket, fuse(s) and harness for damage or corrosion
  • Check for presence and condition of related fuses
  • Swap relay with an identical known-good relay (if available) and re-test
  • Measure voltage and continuity at relay socket with control activated

Signal parameters

  • Nominal relay coil supply: ~12 V when relay driver supplies power (vehicle battery voltage)
  • Relay coil resistance (typical): ~50–200 ohms (manufacturer-specific)
  • Control signal type: switched positive or switched ground from BCM (verify vehicle-specific)
  • Expected voltage at coil control pin when activated: ~12 V (or near 0 V if switched to ground)
  • No continuity (infinite ohms) across coil terminals indicates open coil

Diagnostic algorithm

  1. Confirm the B1459 code and note any additional related codes. Clear codes and attempt to reproduce the fault.
  2. Check fuses for the washer/wiper relay circuits; replace any blown fuses and retest.
  3. Locate the washer pump/wiper relay and visually inspect relay and socket for corrosion, bent pins, or water ingress. Secure any loose connections.
  4. Swap the suspect relay with an identical, known-good relay from the vehicle (e.g., a non-critical circuit) and check whether the function is restored and the code clears.
  5. If swapping is inconclusive, remove the relay and measure coil resistance with an ohmmeter across the coil pins. An open reading (OL/infinite) indicates a failed relay coil — replace relay.
  6. With the relay unplugged, use a lab scope or multimeter to check for the correct control voltage at the relay socket while operating the washer/wiper switch. Verify whether the BCM is commanding the relay.
  7. Perform continuity checks between the relay socket and the BCM/ground point to find open wires or poor connections. Repair or repair/replace damaged wiring or connectors.
  8. After repairs, reassemble, clear codes, and cycle the washer/wiper system multiple times to confirm no return of the fault and that operation is normal.
  9. If wiring, relay and fuses are good but no control signal is present, investigate the BCM/relay driver circuit or consult manufacturer guidance for module-level diagnostics.

Likely causes

  • Relay coil has failed (open winding)
  • Corroded or disconnected relay socket terminal
  • Broken conductor between module and relay socket (pin or splice failure)
  • Blown fuse supplying relay coil
  • Intermittent connection due to water ingress or damaged insulation

Fault status

⚠️ Status
Open circuit detected in relay coil for washer pump motor / windshield wiper. Check relay, fuse, wiring and module connections (B1459).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1458 B1460 B1461 B1234 B1235
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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Keep it short and practical. Up to 500 characters.
Send to email
Code

B1459

Other B — Body

Wiper Washer Pump Motor Relay Coil Circuit Open

Brand: Other
Type: B — Body
Views: UK: 21 EN: 32 RU: 22
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or broken wiring in the relay coil circuit
  • Failed (open) relay coil
  • Poor or corroded connector at the relay or ground
  • Blown or missing fuse in the circuit feeding the relay coil
  • Faulty body control module (BCM) / relay driver (less common)

Symptoms

  • Washer pump does not operate when switch is pressed
  • Windshield wipers may not operate (if same relay is used)
  • Intermittent or no response from washer/wiper controls
  • Related dashboard message or lamp may illuminate
  • Stored B1459 fault code and possibly related codes

What to check

  • Retrieve fault codes and freeze frame data with a diagnostic scanner
  • Visually inspect relay, socket, fuse(s) and harness for damage or corrosion
  • Check for presence and condition of related fuses
  • Swap relay with an identical known-good relay (if available) and re-test
  • Measure voltage and continuity at relay socket with control activated

Signal parameters

  • Nominal relay coil supply: ~12 V when relay driver supplies power (vehicle battery voltage)
  • Relay coil resistance (typical): ~50–200 ohms (manufacturer-specific)
  • Control signal type: switched positive or switched ground from BCM (verify vehicle-specific)
  • Expected voltage at coil control pin when activated: ~12 V (or near 0 V if switched to ground)
  • No continuity (infinite ohms) across coil terminals indicates open coil

Diagnostic algorithm

  1. Confirm the B1459 code and note any additional related codes. Clear codes and attempt to reproduce the fault.
  2. Check fuses for the washer/wiper relay circuits; replace any blown fuses and retest.
  3. Locate the washer pump/wiper relay and visually inspect relay and socket for corrosion, bent pins, or water ingress. Secure any loose connections.
  4. Swap the suspect relay with an identical, known-good relay from the vehicle (e.g., a non-critical circuit) and check whether the function is restored and the code clears.
  5. If swapping is inconclusive, remove the relay and measure coil resistance with an ohmmeter across the coil pins. An open reading (OL/infinite) indicates a failed relay coil — replace relay.
  6. With the relay unplugged, use a lab scope or multimeter to check for the correct control voltage at the relay socket while operating the washer/wiper switch. Verify whether the BCM is commanding the relay.
  7. Perform continuity checks between the relay socket and the BCM/ground point to find open wires or poor connections. Repair or repair/replace damaged wiring or connectors.
  8. After repairs, reassemble, clear codes, and cycle the washer/wiper system multiple times to confirm no return of the fault and that operation is normal.
  9. If wiring, relay and fuses are good but no control signal is present, investigate the BCM/relay driver circuit or consult manufacturer guidance for module-level diagnostics.

Likely causes

  • Relay coil has failed (open winding)
  • Corroded or disconnected relay socket terminal
  • Broken conductor between module and relay socket (pin or splice failure)
  • Blown fuse supplying relay coil
  • Intermittent connection due to water ingress or damaged insulation

Fault status

⚠️ Status
Open circuit detected in relay coil for washer pump motor / windshield wiper. Check relay, fuse, wiring and module connections (B1459).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1458 B1460 B1461 B1234 B1235
6,463

The library contains 6,463 repair and diagnostic manuals. Choose a brand to open the full manual tree by year, model and trim.

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