Code
B1458
LAND ROVER
B — Body
Windshield wiper motor pump relay - failure of circuit
Views:
UK: 3
EN: 12
RU: 6
AI status
Completed
Completed
100%
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
- Record vehicle concerns and scan for codes. Note if B1458 is stored with any other body or electrical codes.
- Verify fuses: locate and inspect the washer pump/relay fuse(s). Replace any blown fuse and retest activation.
- Command the washer pump on while listening at the relay and pump. Note whether the relay clicks or the pump attempts to run.
- Visually inspect relay and connectors for corrosion, water, or damage. Remove relay and flex pins to check fit.
- With key ON, measure voltage at the relay socket supply terminal. Expect battery voltage. If missing, trace supply fuse and wiring.
- Activate the washer and measure relay coil control terminal to confirm BCM is commanding the relay (watch for switched ground or +12V).
- 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.
- Measure pump current during operation. Excessive current implies a seized or failing pump; no current with applied voltage suggests open circuit or poor connection.
- 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.
- 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.
- 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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Code
B1458
MITSUBISHI
B — Body
RL side impact sensor faulty COM
Views:
UK: 4
EN: 10
RU: 6
AI status
Completed
Completed
100%
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
- Record vehicle concerns and scan for codes. Note if B1458 is stored with any other body or electrical codes.
- Verify fuses: locate and inspect the washer pump/relay fuse(s). Replace any blown fuse and retest activation.
- Command the washer pump on while listening at the relay and pump. Note whether the relay clicks or the pump attempts to run.
- Visually inspect relay and connectors for corrosion, water, or damage. Remove relay and flex pins to check fit.
- With key ON, measure voltage at the relay socket supply terminal. Expect battery voltage. If missing, trace supply fuse and wiring.
- Activate the washer and measure relay coil control terminal to confirm BCM is commanding the relay (watch for switched ground or +12V).
- 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.
- Measure pump current during operation. Excessive current implies a seized or failing pump; no current with applied voltage suggests open circuit or poor connection.
- 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.
- 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.
- 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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Code
B1458
Other
B — Body
Wiper Washer Pump Motor Relay Circuit Failure
Views:
UK: 13
EN: 22
RU: 16
AI status
Completed
Completed
100%
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
- Record vehicle concerns and scan for codes. Note if B1458 is stored with any other body or electrical codes.
- Verify fuses: locate and inspect the washer pump/relay fuse(s). Replace any blown fuse and retest activation.
- Command the washer pump on while listening at the relay and pump. Note whether the relay clicks or the pump attempts to run.
- Visually inspect relay and connectors for corrosion, water, or damage. Remove relay and flex pins to check fit.
- With key ON, measure voltage at the relay socket supply terminal. Expect battery voltage. If missing, trace supply fuse and wiring.
- Activate the washer and measure relay coil control terminal to confirm BCM is commanding the relay (watch for switched ground or +12V).
- 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.
- Measure pump current during operation. Excessive current implies a seized or failing pump; no current with applied voltage suggests open circuit or poor connection.
- 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.
- 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.
- 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
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email