Code
B1241
ALFA ROMEO
B — Body
Rear washer system pump relay short to positive
Views:
UK: 3
EN: 8
RU: 2
AI status
Completed
Completed
100%
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
- Record code and symptoms. Disconnect battery negative before extensive connector work to avoid shorts.
- Visual inspection: check relay, relay socket, harness near trunk hinge and pump connector for damage, corrosion, or moisture.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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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Code
B1241
FIAT
B — Body
Rear washer system pump relay short to positive
Views:
UK: 2
EN: 8
RU: 2
AI status
Completed
Completed
100%
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
- Record code and symptoms. Disconnect battery negative before extensive connector work to avoid shorts.
- Visual inspection: check relay, relay socket, harness near trunk hinge and pump connector for damage, corrosion, or moisture.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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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Code
B1241
LAND ROVER
B — Body
Adaptive speed limit button
Views:
UK: 6
EN: 13
RU: 3
AI status
Completed
Completed
100%
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
- Record code and symptoms. Disconnect battery negative before extensive connector work to avoid shorts.
- Visual inspection: check relay, relay socket, harness near trunk hinge and pump connector for damage, corrosion, or moisture.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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
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Code
B1241
MERCEDES-BENZ
B — Body
Refrigerant Fill
Views:
UK: 20
EN: 23
RU: 11
AI status
Completed
Completed
100%
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
- Record code and symptoms. Disconnect battery negative before extensive connector work to avoid shorts.
- Visual inspection: check relay, relay socket, harness near trunk hinge and pump connector for damage, corrosion, or moisture.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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
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+100 karma for a short comment :)
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Code
B1241
Other
B — Body
Wiper Washer Rear Pump Relay Circuit Short to Battery
Views:
UK: 28
EN: 36
RU: 28
AI status
Completed
Completed
100%
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
- Record code and symptoms. Disconnect battery negative before extensive connector work to avoid shorts.
- Visual inspection: check relay, relay socket, harness near trunk hinge and pump connector for damage, corrosion, or moisture.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
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0
Send to email