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Home / DTC / B1241 — Rear washer system pump relay short to positive

B1241 — Rear washer system pump relay short to positive

Detailed page for trouble code B1241.

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Code

B1241

ALFA ROMEO B — Body

Rear washer system pump relay short to positive

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

Causes

  • Damaged or chafed wiring contacting battery positive or a constant 12 V feed
  • Shorted relay coil or internal relay fault connecting coil to B+
  • Corroded/bridged connector at relay, pump or body control module (BCM)
  • Washer pump motor internal short feeding back to relay circuit
  • Faulty body control module or relay driver transistor stuck toward B+
  • Incorrect replacement part or improper previous repair (pin swap, wrong relay)

Symptoms

  • Rear washer pump runs continuously or intermittently without switch input
  • Blown fuse(s) or repeated fuse failure in washer circuit
  • Washer function inoperative or erratic from switch commands
  • Fault warning or stored B1241 in BCM/vehicle diagnostics
  • Possible relay overheating or burning smell at relay/connector

What to check

  • Read and record freeze frame / any related stored codes; clear and re-scan after tests
  • Visually inspect wiring harness from BCM/relay to rear washer pump for damage, corrosion, chafing and water ingress
  • Inspect relay and relay socket for melted plastic, corrosion or bridging between terminals
  • Check relevant fuses for continuity and signs of overheating
  • Disconnect the rear washer pump and relay then verify whether the fault clears
  • Backprobe relay supply and control terminals with a multimeter/oscilloscope while operating washer switch

Signal parameters

  • Battery supply to relay: ~11–14 V with ignition ON (verify with multimeter)
  • Control/command line: should be isolated from B+ when inactive; expected to change state when washer is commanded (may be ground- or +12 V-switched depending on design) — consult vehicle wiring diagram
  • Connector continuity: near-zero ohms between supply pin and battery positive when supply present; near-infinite (open) between control and B+ when circuit is healthy and inactive
  • Pump power side: 12 V on pump positive only when pump is commanded; pump negative should have proper ground continuity

Diagnostic algorithm

  1. Record code and symptoms. Disconnect battery negative before extensive connector work to avoid shorts.
  2. Visual inspection: check relay, relay socket, harness near trunk hinge and pump connector for damage, corrosion, or moisture.
  3. Remove relay: with ignition OFF, inspect pins for bridging or melted plastic. Measure resistance between supply and control pins on the socket — a near short indicates harness/connector fault.
  4. With relay removed and ignition ON, measure voltage at the relay supply terminal — should be battery voltage. Measure voltage at the control terminal while actuating washer switch; note whether it goes to battery or ground.
  5. Check for short-to-B+: measure resistance between control wire and battery positive with ignition OFF. Low resistance indicates short to positive; trace harness to locate contact point.
  6. Disconnect rear washer pump connector. Clear codes, reconnect battery, and cycle washer switch. If code clears and symptoms stop, suspect pump or pump connector wiring backfeeding the circuit.
  7. Bench-test the relay and pump separately: apply appropriate supply to relay coil and contacts to confirm correct operation; test pump directly with battery through a fused lead to check for internal shorts/overcurrent.
  8. If wiring appears intact but control line shows B+ when it should not, test/replace relay and then verify BCM driver output. If BCM output is stuck or driving incorrectly, consult manufacturer procedures for module testing/replacement.
  9. Repair or replace damaged wiring, connectors, relay or pump as indicated. After repairs, clear codes and perform functional test and road/operation verification.

Likely causes

  • Wiring abrasion near harness clips, trunk hinge or rear lamp area causing contact with B+
  • Relay shorted internally from moisture/corrosion
  • Connector pins contaminated or bent causing contact between supply and control pins
  • Washer pump motor failure creating backfeed into relay circuit

Fault status

⚠️ Status
B1241 - Rear washer pump relay circuit short to positive (possible short to battery in relay/control wiring or faulty relay/pump/BCM).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B1240 B1242 B1250 B1261
89

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

ALFA ROMEO

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Code

B1241

FIAT B — Body

Rear washer system pump relay short to positive

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

Causes

  • Damaged or chafed wiring contacting battery positive or a constant 12 V feed
  • Shorted relay coil or internal relay fault connecting coil to B+
  • Corroded/bridged connector at relay, pump or body control module (BCM)
  • Washer pump motor internal short feeding back to relay circuit
  • Faulty body control module or relay driver transistor stuck toward B+
  • Incorrect replacement part or improper previous repair (pin swap, wrong relay)

Symptoms

  • Rear washer pump runs continuously or intermittently without switch input
  • Blown fuse(s) or repeated fuse failure in washer circuit
  • Washer function inoperative or erratic from switch commands
  • Fault warning or stored B1241 in BCM/vehicle diagnostics
  • Possible relay overheating or burning smell at relay/connector

What to check

  • Read and record freeze frame / any related stored codes; clear and re-scan after tests
  • Visually inspect wiring harness from BCM/relay to rear washer pump for damage, corrosion, chafing and water ingress
  • Inspect relay and relay socket for melted plastic, corrosion or bridging between terminals
  • Check relevant fuses for continuity and signs of overheating
  • Disconnect the rear washer pump and relay then verify whether the fault clears
  • Backprobe relay supply and control terminals with a multimeter/oscilloscope while operating washer switch

Signal parameters

  • Battery supply to relay: ~11–14 V with ignition ON (verify with multimeter)
  • Control/command line: should be isolated from B+ when inactive; expected to change state when washer is commanded (may be ground- or +12 V-switched depending on design) — consult vehicle wiring diagram
  • Connector continuity: near-zero ohms between supply pin and battery positive when supply present; near-infinite (open) between control and B+ when circuit is healthy and inactive
  • Pump power side: 12 V on pump positive only when pump is commanded; pump negative should have proper ground continuity

Diagnostic algorithm

  1. Record code and symptoms. Disconnect battery negative before extensive connector work to avoid shorts.
  2. Visual inspection: check relay, relay socket, harness near trunk hinge and pump connector for damage, corrosion, or moisture.
  3. Remove relay: with ignition OFF, inspect pins for bridging or melted plastic. Measure resistance between supply and control pins on the socket — a near short indicates harness/connector fault.
  4. With relay removed and ignition ON, measure voltage at the relay supply terminal — should be battery voltage. Measure voltage at the control terminal while actuating washer switch; note whether it goes to battery or ground.
  5. Check for short-to-B+: measure resistance between control wire and battery positive with ignition OFF. Low resistance indicates short to positive; trace harness to locate contact point.
  6. Disconnect rear washer pump connector. Clear codes, reconnect battery, and cycle washer switch. If code clears and symptoms stop, suspect pump or pump connector wiring backfeeding the circuit.
  7. Bench-test the relay and pump separately: apply appropriate supply to relay coil and contacts to confirm correct operation; test pump directly with battery through a fused lead to check for internal shorts/overcurrent.
  8. If wiring appears intact but control line shows B+ when it should not, test/replace relay and then verify BCM driver output. If BCM output is stuck or driving incorrectly, consult manufacturer procedures for module testing/replacement.
  9. Repair or replace damaged wiring, connectors, relay or pump as indicated. After repairs, clear codes and perform functional test and road/operation verification.

Likely causes

  • Wiring abrasion near harness clips, trunk hinge or rear lamp area causing contact with B+
  • Relay shorted internally from moisture/corrosion
  • Connector pins contaminated or bent causing contact between supply and control pins
  • Washer pump motor failure creating backfeed into relay circuit

Fault status

⚠️ Status
B1241 - Rear washer pump relay circuit short to positive (possible short to battery in relay/control wiring or faulty relay/pump/BCM).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B1240 B1242 B1250 B1261
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Code

B1241

LAND ROVER B — Body

Adaptive speed limit button

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

Causes

  • Damaged or chafed wiring contacting battery positive or a constant 12 V feed
  • Shorted relay coil or internal relay fault connecting coil to B+
  • Corroded/bridged connector at relay, pump or body control module (BCM)
  • Washer pump motor internal short feeding back to relay circuit
  • Faulty body control module or relay driver transistor stuck toward B+
  • Incorrect replacement part or improper previous repair (pin swap, wrong relay)

Symptoms

  • Rear washer pump runs continuously or intermittently without switch input
  • Blown fuse(s) or repeated fuse failure in washer circuit
  • Washer function inoperative or erratic from switch commands
  • Fault warning or stored B1241 in BCM/vehicle diagnostics
  • Possible relay overheating or burning smell at relay/connector

What to check

  • Read and record freeze frame / any related stored codes; clear and re-scan after tests
  • Visually inspect wiring harness from BCM/relay to rear washer pump for damage, corrosion, chafing and water ingress
  • Inspect relay and relay socket for melted plastic, corrosion or bridging between terminals
  • Check relevant fuses for continuity and signs of overheating
  • Disconnect the rear washer pump and relay then verify whether the fault clears
  • Backprobe relay supply and control terminals with a multimeter/oscilloscope while operating washer switch

Signal parameters

  • Battery supply to relay: ~11–14 V with ignition ON (verify with multimeter)
  • Control/command line: should be isolated from B+ when inactive; expected to change state when washer is commanded (may be ground- or +12 V-switched depending on design) — consult vehicle wiring diagram
  • Connector continuity: near-zero ohms between supply pin and battery positive when supply present; near-infinite (open) between control and B+ when circuit is healthy and inactive
  • Pump power side: 12 V on pump positive only when pump is commanded; pump negative should have proper ground continuity

Diagnostic algorithm

  1. Record code and symptoms. Disconnect battery negative before extensive connector work to avoid shorts.
  2. Visual inspection: check relay, relay socket, harness near trunk hinge and pump connector for damage, corrosion, or moisture.
  3. Remove relay: with ignition OFF, inspect pins for bridging or melted plastic. Measure resistance between supply and control pins on the socket — a near short indicates harness/connector fault.
  4. With relay removed and ignition ON, measure voltage at the relay supply terminal — should be battery voltage. Measure voltage at the control terminal while actuating washer switch; note whether it goes to battery or ground.
  5. Check for short-to-B+: measure resistance between control wire and battery positive with ignition OFF. Low resistance indicates short to positive; trace harness to locate contact point.
  6. Disconnect rear washer pump connector. Clear codes, reconnect battery, and cycle washer switch. If code clears and symptoms stop, suspect pump or pump connector wiring backfeeding the circuit.
  7. Bench-test the relay and pump separately: apply appropriate supply to relay coil and contacts to confirm correct operation; test pump directly with battery through a fused lead to check for internal shorts/overcurrent.
  8. If wiring appears intact but control line shows B+ when it should not, test/replace relay and then verify BCM driver output. If BCM output is stuck or driving incorrectly, consult manufacturer procedures for module testing/replacement.
  9. Repair or replace damaged wiring, connectors, relay or pump as indicated. After repairs, clear codes and perform functional test and road/operation verification.

Likely causes

  • Wiring abrasion near harness clips, trunk hinge or rear lamp area causing contact with B+
  • Relay shorted internally from moisture/corrosion
  • Connector pins contaminated or bent causing contact between supply and control pins
  • Washer pump motor failure creating backfeed into relay circuit

Fault status

⚠️ Status
B1241 - Rear washer pump relay circuit short to positive (possible short to battery in relay/control wiring or faulty relay/pump/BCM).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B1240 B1242 B1250 B1261
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

B1241

MERCEDES-BENZ B — Body

Refrigerant Fill

Brand: MERCEDES-BENZ
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or chafed wiring contacting battery positive or a constant 12 V feed
  • Shorted relay coil or internal relay fault connecting coil to B+
  • Corroded/bridged connector at relay, pump or body control module (BCM)
  • Washer pump motor internal short feeding back to relay circuit
  • Faulty body control module or relay driver transistor stuck toward B+
  • Incorrect replacement part or improper previous repair (pin swap, wrong relay)

Symptoms

  • Rear washer pump runs continuously or intermittently without switch input
  • Blown fuse(s) or repeated fuse failure in washer circuit
  • Washer function inoperative or erratic from switch commands
  • Fault warning or stored B1241 in BCM/vehicle diagnostics
  • Possible relay overheating or burning smell at relay/connector

What to check

  • Read and record freeze frame / any related stored codes; clear and re-scan after tests
  • Visually inspect wiring harness from BCM/relay to rear washer pump for damage, corrosion, chafing and water ingress
  • Inspect relay and relay socket for melted plastic, corrosion or bridging between terminals
  • Check relevant fuses for continuity and signs of overheating
  • Disconnect the rear washer pump and relay then verify whether the fault clears
  • Backprobe relay supply and control terminals with a multimeter/oscilloscope while operating washer switch

Signal parameters

  • Battery supply to relay: ~11–14 V with ignition ON (verify with multimeter)
  • Control/command line: should be isolated from B+ when inactive; expected to change state when washer is commanded (may be ground- or +12 V-switched depending on design) — consult vehicle wiring diagram
  • Connector continuity: near-zero ohms between supply pin and battery positive when supply present; near-infinite (open) between control and B+ when circuit is healthy and inactive
  • Pump power side: 12 V on pump positive only when pump is commanded; pump negative should have proper ground continuity

Diagnostic algorithm

  1. Record code and symptoms. Disconnect battery negative before extensive connector work to avoid shorts.
  2. Visual inspection: check relay, relay socket, harness near trunk hinge and pump connector for damage, corrosion, or moisture.
  3. Remove relay: with ignition OFF, inspect pins for bridging or melted plastic. Measure resistance between supply and control pins on the socket — a near short indicates harness/connector fault.
  4. With relay removed and ignition ON, measure voltage at the relay supply terminal — should be battery voltage. Measure voltage at the control terminal while actuating washer switch; note whether it goes to battery or ground.
  5. Check for short-to-B+: measure resistance between control wire and battery positive with ignition OFF. Low resistance indicates short to positive; trace harness to locate contact point.
  6. Disconnect rear washer pump connector. Clear codes, reconnect battery, and cycle washer switch. If code clears and symptoms stop, suspect pump or pump connector wiring backfeeding the circuit.
  7. Bench-test the relay and pump separately: apply appropriate supply to relay coil and contacts to confirm correct operation; test pump directly with battery through a fused lead to check for internal shorts/overcurrent.
  8. If wiring appears intact but control line shows B+ when it should not, test/replace relay and then verify BCM driver output. If BCM output is stuck or driving incorrectly, consult manufacturer procedures for module testing/replacement.
  9. Repair or replace damaged wiring, connectors, relay or pump as indicated. After repairs, clear codes and perform functional test and road/operation verification.

Likely causes

  • Wiring abrasion near harness clips, trunk hinge or rear lamp area causing contact with B+
  • Relay shorted internally from moisture/corrosion
  • Connector pins contaminated or bent causing contact between supply and control pins
  • Washer pump motor failure creating backfeed into relay circuit

Fault status

⚠️ Status
B1241 - Rear washer pump relay circuit short to positive (possible short to battery in relay/control wiring or faulty relay/pump/BCM).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B1240 B1242 B1250 B1261
856

Browse 856 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

B1241

Other B — Body

Wiper Washer Rear Pump Relay Circuit Short to Battery

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

Causes

  • Damaged or chafed wiring contacting battery positive or a constant 12 V feed
  • Shorted relay coil or internal relay fault connecting coil to B+
  • Corroded/bridged connector at relay, pump or body control module (BCM)
  • Washer pump motor internal short feeding back to relay circuit
  • Faulty body control module or relay driver transistor stuck toward B+
  • Incorrect replacement part or improper previous repair (pin swap, wrong relay)

Symptoms

  • Rear washer pump runs continuously or intermittently without switch input
  • Blown fuse(s) or repeated fuse failure in washer circuit
  • Washer function inoperative or erratic from switch commands
  • Fault warning or stored B1241 in BCM/vehicle diagnostics
  • Possible relay overheating or burning smell at relay/connector

What to check

  • Read and record freeze frame / any related stored codes; clear and re-scan after tests
  • Visually inspect wiring harness from BCM/relay to rear washer pump for damage, corrosion, chafing and water ingress
  • Inspect relay and relay socket for melted plastic, corrosion or bridging between terminals
  • Check relevant fuses for continuity and signs of overheating
  • Disconnect the rear washer pump and relay then verify whether the fault clears
  • Backprobe relay supply and control terminals with a multimeter/oscilloscope while operating washer switch

Signal parameters

  • Battery supply to relay: ~11–14 V with ignition ON (verify with multimeter)
  • Control/command line: should be isolated from B+ when inactive; expected to change state when washer is commanded (may be ground- or +12 V-switched depending on design) — consult vehicle wiring diagram
  • Connector continuity: near-zero ohms between supply pin and battery positive when supply present; near-infinite (open) between control and B+ when circuit is healthy and inactive
  • Pump power side: 12 V on pump positive only when pump is commanded; pump negative should have proper ground continuity

Diagnostic algorithm

  1. Record code and symptoms. Disconnect battery negative before extensive connector work to avoid shorts.
  2. Visual inspection: check relay, relay socket, harness near trunk hinge and pump connector for damage, corrosion, or moisture.
  3. Remove relay: with ignition OFF, inspect pins for bridging or melted plastic. Measure resistance between supply and control pins on the socket — a near short indicates harness/connector fault.
  4. With relay removed and ignition ON, measure voltage at the relay supply terminal — should be battery voltage. Measure voltage at the control terminal while actuating washer switch; note whether it goes to battery or ground.
  5. Check for short-to-B+: measure resistance between control wire and battery positive with ignition OFF. Low resistance indicates short to positive; trace harness to locate contact point.
  6. Disconnect rear washer pump connector. Clear codes, reconnect battery, and cycle washer switch. If code clears and symptoms stop, suspect pump or pump connector wiring backfeeding the circuit.
  7. Bench-test the relay and pump separately: apply appropriate supply to relay coil and contacts to confirm correct operation; test pump directly with battery through a fused lead to check for internal shorts/overcurrent.
  8. If wiring appears intact but control line shows B+ when it should not, test/replace relay and then verify BCM driver output. If BCM output is stuck or driving incorrectly, consult manufacturer procedures for module testing/replacement.
  9. Repair or replace damaged wiring, connectors, relay or pump as indicated. After repairs, clear codes and perform functional test and road/operation verification.

Likely causes

  • Wiring abrasion near harness clips, trunk hinge or rear lamp area causing contact with B+
  • Relay shorted internally from moisture/corrosion
  • Connector pins contaminated or bent causing contact between supply and control pins
  • Washer pump motor failure creating backfeed into relay circuit

Fault status

⚠️ Status
B1241 - Rear washer pump relay circuit short to positive (possible short to battery in relay/control wiring or faulty relay/pump/BCM).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

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