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Home / DTC / B1458 — Windshield wiper motor pump relay - failure of circuit

B1458 — Windshield wiper motor pump relay - failure of circuit

Detailed page for trouble code B1458.

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22,491specific
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Code

B1458

LAND ROVER B — Body

Windshield wiper motor pump relay - failure of circuit

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

Causes

  • Faulty or stuck washer pump relay
  • Open or shorted wiring between relay, pump and BCM
  • Poor or corroded relay/pump/BCM connector or ground
  • Blown fuse protecting the pump/relay circuit
  • Failed washer pump motor drawing abnormal current
  • Faulty BCM / body control module output

Symptoms

  • Washer fluid does not pump when activated
  • No audible relay click when washer is commanded
  • Intermittent or no operation of washer pump
  • Washer pump works only sometimes or after tapping relay/connector
  • Related warning message or Washer/Washer Pump fault lamp on instrument cluster

What to check

  • Scan vehicle for additional codes and note freeze-frame data
  • Visually inspect fuse(s) for the washer pump and replace if blown
  • Listen for relay click when washer is activated
  • Inspect connectors at the pump, relay, and BCM for corrosion, water ingress, or loose pins
  • Probe for battery voltage at the pump supply pin while activating the washer
  • Check ground continuity at the pump and relay ground point

Signal parameters

  • Battery voltage at pump supply when active: ~11–14 V
  • Relay coil activation signal: switched ground or +12 V from BCM (0 V idle, ~12 V when driven or vice versa depending on vehicle)
  • Relay coil resistance (typical): 50–200 ohms (varies by relay)
  • Pump current draw (typical): 0.5–5 A depending on pump design; much higher indicates seizure/short
  • Relay contact resistance when closed:

Diagnostic algorithm

  1. Record vehicle concerns and scan for codes. Note if B1458 is stored with any other body or electrical codes.
  2. Verify fuses: locate and inspect the washer pump/relay fuse(s). Replace any blown fuse and retest activation.
  3. Command the washer pump on while listening at the relay and pump. Note whether the relay clicks or the pump attempts to run.
  4. Visually inspect relay and connectors for corrosion, water, or damage. Remove relay and flex pins to check fit.
  5. With key ON, measure voltage at the relay socket supply terminal. Expect battery voltage. If missing, trace supply fuse and wiring.
  6. Activate the washer and measure relay coil control terminal to confirm BCM is commanding the relay (watch for switched ground or +12V).
  7. If relay control is present but pump does not run, measure voltage at the pump connector while activated. If voltage present, bench-test or apply 12V to pump to verify pump operation.
  8. Measure pump current during operation. Excessive current implies a seized or failing pump; no current with applied voltage suggests open circuit or poor connection.
  9. If relay does not receive control signal from BCM but wiring is intact, inspect wiring continuity to BCM and check BCM grounds. Repair any damaged wiring/connectors.
  10. Replace suspect relay and/or pump after confirming faulty item. Clear codes, perform functional test and re-scan to confirm the fault does not return.
  11. If wiring, relay, and pump test good yet B1458 persists, suspect BCM fault and consider module reprogramming/replacement after manufacturer procedures.

Likely causes

  • Corroded connector at washer pump or relay
  • Failed relay contacts or coil
  • Blown fuse in washer pump circuit
  • Broken or chafed wire causing open circuit
  • Failed washer pump motor (internal electrical fault)

Fault status

⚠️ Status
Failure detected in windshield washer pump relay circuit — open/short or no control signal. Fault recorded in BCM.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B1457 B1459 B1240 U0422
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

B1458

MITSUBISHI B — Body

RL side impact sensor faulty COM

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

Causes

  • Faulty or stuck washer pump relay
  • Open or shorted wiring between relay, pump and BCM
  • Poor or corroded relay/pump/BCM connector or ground
  • Blown fuse protecting the pump/relay circuit
  • Failed washer pump motor drawing abnormal current
  • Faulty BCM / body control module output

Symptoms

  • Washer fluid does not pump when activated
  • No audible relay click when washer is commanded
  • Intermittent or no operation of washer pump
  • Washer pump works only sometimes or after tapping relay/connector
  • Related warning message or Washer/Washer Pump fault lamp on instrument cluster

What to check

  • Scan vehicle for additional codes and note freeze-frame data
  • Visually inspect fuse(s) for the washer pump and replace if blown
  • Listen for relay click when washer is activated
  • Inspect connectors at the pump, relay, and BCM for corrosion, water ingress, or loose pins
  • Probe for battery voltage at the pump supply pin while activating the washer
  • Check ground continuity at the pump and relay ground point

Signal parameters

  • Battery voltage at pump supply when active: ~11–14 V
  • Relay coil activation signal: switched ground or +12 V from BCM (0 V idle, ~12 V when driven or vice versa depending on vehicle)
  • Relay coil resistance (typical): 50–200 ohms (varies by relay)
  • Pump current draw (typical): 0.5–5 A depending on pump design; much higher indicates seizure/short
  • Relay contact resistance when closed:

Diagnostic algorithm

  1. Record vehicle concerns and scan for codes. Note if B1458 is stored with any other body or electrical codes.
  2. Verify fuses: locate and inspect the washer pump/relay fuse(s). Replace any blown fuse and retest activation.
  3. Command the washer pump on while listening at the relay and pump. Note whether the relay clicks or the pump attempts to run.
  4. Visually inspect relay and connectors for corrosion, water, or damage. Remove relay and flex pins to check fit.
  5. With key ON, measure voltage at the relay socket supply terminal. Expect battery voltage. If missing, trace supply fuse and wiring.
  6. Activate the washer and measure relay coil control terminal to confirm BCM is commanding the relay (watch for switched ground or +12V).
  7. If relay control is present but pump does not run, measure voltage at the pump connector while activated. If voltage present, bench-test or apply 12V to pump to verify pump operation.
  8. Measure pump current during operation. Excessive current implies a seized or failing pump; no current with applied voltage suggests open circuit or poor connection.
  9. If relay does not receive control signal from BCM but wiring is intact, inspect wiring continuity to BCM and check BCM grounds. Repair any damaged wiring/connectors.
  10. Replace suspect relay and/or pump after confirming faulty item. Clear codes, perform functional test and re-scan to confirm the fault does not return.
  11. If wiring, relay, and pump test good yet B1458 persists, suspect BCM fault and consider module reprogramming/replacement after manufacturer procedures.

Likely causes

  • Corroded connector at washer pump or relay
  • Failed relay contacts or coil
  • Blown fuse in washer pump circuit
  • Broken or chafed wire causing open circuit
  • Failed washer pump motor (internal electrical fault)

Fault status

⚠️ Status
Failure detected in windshield washer pump relay circuit — open/short or no control signal. Fault recorded in BCM.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B1457 B1459 B1240 U0422
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.
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Code

B1458

Other B — Body

Wiper Washer Pump Motor Relay Circuit Failure

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

Causes

  • Faulty or stuck washer pump relay
  • Open or shorted wiring between relay, pump and BCM
  • Poor or corroded relay/pump/BCM connector or ground
  • Blown fuse protecting the pump/relay circuit
  • Failed washer pump motor drawing abnormal current
  • Faulty BCM / body control module output

Symptoms

  • Washer fluid does not pump when activated
  • No audible relay click when washer is commanded
  • Intermittent or no operation of washer pump
  • Washer pump works only sometimes or after tapping relay/connector
  • Related warning message or Washer/Washer Pump fault lamp on instrument cluster

What to check

  • Scan vehicle for additional codes and note freeze-frame data
  • Visually inspect fuse(s) for the washer pump and replace if blown
  • Listen for relay click when washer is activated
  • Inspect connectors at the pump, relay, and BCM for corrosion, water ingress, or loose pins
  • Probe for battery voltage at the pump supply pin while activating the washer
  • Check ground continuity at the pump and relay ground point

Signal parameters

  • Battery voltage at pump supply when active: ~11–14 V
  • Relay coil activation signal: switched ground or +12 V from BCM (0 V idle, ~12 V when driven or vice versa depending on vehicle)
  • Relay coil resistance (typical): 50–200 ohms (varies by relay)
  • Pump current draw (typical): 0.5–5 A depending on pump design; much higher indicates seizure/short
  • Relay contact resistance when closed:

Diagnostic algorithm

  1. Record vehicle concerns and scan for codes. Note if B1458 is stored with any other body or electrical codes.
  2. Verify fuses: locate and inspect the washer pump/relay fuse(s). Replace any blown fuse and retest activation.
  3. Command the washer pump on while listening at the relay and pump. Note whether the relay clicks or the pump attempts to run.
  4. Visually inspect relay and connectors for corrosion, water, or damage. Remove relay and flex pins to check fit.
  5. With key ON, measure voltage at the relay socket supply terminal. Expect battery voltage. If missing, trace supply fuse and wiring.
  6. Activate the washer and measure relay coil control terminal to confirm BCM is commanding the relay (watch for switched ground or +12V).
  7. If relay control is present but pump does not run, measure voltage at the pump connector while activated. If voltage present, bench-test or apply 12V to pump to verify pump operation.
  8. Measure pump current during operation. Excessive current implies a seized or failing pump; no current with applied voltage suggests open circuit or poor connection.
  9. If relay does not receive control signal from BCM but wiring is intact, inspect wiring continuity to BCM and check BCM grounds. Repair any damaged wiring/connectors.
  10. Replace suspect relay and/or pump after confirming faulty item. Clear codes, perform functional test and re-scan to confirm the fault does not return.
  11. If wiring, relay, and pump test good yet B1458 persists, suspect BCM fault and consider module reprogramming/replacement after manufacturer procedures.

Likely causes

  • Corroded connector at washer pump or relay
  • Failed relay contacts or coil
  • Blown fuse in washer pump circuit
  • Broken or chafed wire causing open circuit
  • Failed washer pump motor (internal electrical fault)

Fault status

⚠️ Status
Failure detected in windshield washer pump relay circuit — open/short or no control signal. Fault recorded in BCM.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

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