Code
B1245
ALFA ROMEO
B — Body
Rear wiper relay circuit short to positive
Views:
UK: 3
EN: 5
RU: 6
AI status
Completed
Completed
100%
Causes
- Shorted wiring in rear wiper relay/control circuit to battery positive
- Faulty or welded relay whose contact/coil is feeding +12V into the control circuit
- Corroded, damaged or water‑ingressed rear wiper relay connector or harness
- Incorrectly fitted aftermarket accessory or jump‑lead creating a feed to the circuit
- Body control module (BCM) or wiper module internal fault (less common)
- Blown or poor ground causing circuit behavior to appear as a short to positive
Symptoms
- Rear wiper runs continuously or cannot be turned off
- Rear wiper park function fails or wiper stops in wrong position
- Rear wiper fuse blows repeatedly or other related fuses affected
- Battery drain when vehicle is off (if wiper powered constantly)
- Dash indicator/multiple body system warnings related to rear wiper
What to check
- Visually inspect the rear wiper relay, socket and associated connectors for corrosion, melted insulation or water ingress
- Check rear wiper fuse(s) for condition and correct rating
- With ignition OFF, disconnect the rear wiper relay and check if the fault clears or if circuit voltage to the control pin remains at battery +12V
- Perform a visual harness inspection along the path from relay to motor and BCM for chafe, pinched wiring or aftermarket splices
- Measure voltage at the relay control pin with a DMM: compare ignition OFF and ON, and when wiper is commanded
- Check for a good ground at the wiper motor and relay ground point
Signal parameters
- Control circuit (relay coil) inactive: ~0 V (or open circuit) with ignition off
- Control circuit active: ~12 V when relay is commanded ON (switch/module supplying +12 V or ground depending on design)
- Relay coil resistance (typical): ~50–200 ohms (varies by relay); compare to specification if available
- Motor power supply: ~12 V when wiper is commanded to run; near 0 V when not commanded (unless relay/wiring fault present)
Diagnostic algorithm
- Read and record freeze frame and number of occurrences; clear the DTC and see if it returns
- Attempt to reproduce the complaint (operate rear wiper through all modes) while observing behavior and lamp/fuse status
- Visually inspect relay, relay socket and wiring for damage, corrosion or water ingress
- Remove rear wiper relay and re-check voltage on the control circuit with ignition OFF — if still at +12 V, there is a short to positive downstream of relay or at the control wiring
- With relay removed, disconnect the rear wiper motor connector; check whether the short condition clears. If it clears, trace motor wiring and motor for internal short
- Backprobing: measure voltage between the control wire and chassis ground with ignition OFF and ON and while commanding the wiper. A constant ~12 V with no command indicates a short to battery
- Perform a resistance-to-battery test with ignition OFF: check for near‑zero ohms between the suspect control wire and B+ to confirm short (ensure power removed before resistance checks)
- Bench‑test or swap relay with a known good relay of same type to determine if relay is at fault
- If wiring and relay check good, test the BCM/wiper control module output for proper operation or intermittent faults; consult manufacturer wiring diagrams and component testing procedures
- After repairs, clear codes and perform a full function test; re-scan to ensure the DTC does not return
Likely causes
- Shorted/abraded wire contacting a chassis harness or bodywork and touching battery +12V at or near the rear wiper relay
- Failed relay with stuck/welded contact feeding +12V back into the control wire
- Water intrusion or corroded connector causing unintended continuity to positive
Fault status
Status
Stored fault: Rear wiper relay control circuit shorted to positive (B1245). Requires inspection of relay, harness and control module.
Repair difficulty: Medium
Diagnostic time: 0.5–1.5 hours
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Code
B1245
FIAT
B — Body
Rear wiper relay circuit short to positive
Views:
UK: 3
EN: 4
RU: 6
AI status
Completed
Completed
100%
Causes
- Shorted wiring in rear wiper relay/control circuit to battery positive
- Faulty or welded relay whose contact/coil is feeding +12V into the control circuit
- Corroded, damaged or water‑ingressed rear wiper relay connector or harness
- Incorrectly fitted aftermarket accessory or jump‑lead creating a feed to the circuit
- Body control module (BCM) or wiper module internal fault (less common)
- Blown or poor ground causing circuit behavior to appear as a short to positive
Symptoms
- Rear wiper runs continuously or cannot be turned off
- Rear wiper park function fails or wiper stops in wrong position
- Rear wiper fuse blows repeatedly or other related fuses affected
- Battery drain when vehicle is off (if wiper powered constantly)
- Dash indicator/multiple body system warnings related to rear wiper
What to check
- Visually inspect the rear wiper relay, socket and associated connectors for corrosion, melted insulation or water ingress
- Check rear wiper fuse(s) for condition and correct rating
- With ignition OFF, disconnect the rear wiper relay and check if the fault clears or if circuit voltage to the control pin remains at battery +12V
- Perform a visual harness inspection along the path from relay to motor and BCM for chafe, pinched wiring or aftermarket splices
- Measure voltage at the relay control pin with a DMM: compare ignition OFF and ON, and when wiper is commanded
- Check for a good ground at the wiper motor and relay ground point
Signal parameters
- Control circuit (relay coil) inactive: ~0 V (or open circuit) with ignition off
- Control circuit active: ~12 V when relay is commanded ON (switch/module supplying +12 V or ground depending on design)
- Relay coil resistance (typical): ~50–200 ohms (varies by relay); compare to specification if available
- Motor power supply: ~12 V when wiper is commanded to run; near 0 V when not commanded (unless relay/wiring fault present)
Diagnostic algorithm
- Read and record freeze frame and number of occurrences; clear the DTC and see if it returns
- Attempt to reproduce the complaint (operate rear wiper through all modes) while observing behavior and lamp/fuse status
- Visually inspect relay, relay socket and wiring for damage, corrosion or water ingress
- Remove rear wiper relay and re-check voltage on the control circuit with ignition OFF — if still at +12 V, there is a short to positive downstream of relay or at the control wiring
- With relay removed, disconnect the rear wiper motor connector; check whether the short condition clears. If it clears, trace motor wiring and motor for internal short
- Backprobing: measure voltage between the control wire and chassis ground with ignition OFF and ON and while commanding the wiper. A constant ~12 V with no command indicates a short to battery
- Perform a resistance-to-battery test with ignition OFF: check for near‑zero ohms between the suspect control wire and B+ to confirm short (ensure power removed before resistance checks)
- Bench‑test or swap relay with a known good relay of same type to determine if relay is at fault
- If wiring and relay check good, test the BCM/wiper control module output for proper operation or intermittent faults; consult manufacturer wiring diagrams and component testing procedures
- After repairs, clear codes and perform a full function test; re-scan to ensure the DTC does not return
Likely causes
- Shorted/abraded wire contacting a chassis harness or bodywork and touching battery +12V at or near the rear wiper relay
- Failed relay with stuck/welded contact feeding +12V back into the control wire
- Water intrusion or corroded connector causing unintended continuity to positive
Fault status
Status
Stored fault: Rear wiper relay control circuit shorted to positive (B1245). Requires inspection of relay, harness and control module.
Repair difficulty: Medium
Diagnostic time: 0.5–1.5 hours
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Code
B1245
HUMMER
B — Body
CD Changer Not Responding
Views:
UK: 6
EN: 11
RU: 8
AI status
Completed
Completed
100%
Causes
- Shorted wiring in rear wiper relay/control circuit to battery positive
- Faulty or welded relay whose contact/coil is feeding +12V into the control circuit
- Corroded, damaged or water‑ingressed rear wiper relay connector or harness
- Incorrectly fitted aftermarket accessory or jump‑lead creating a feed to the circuit
- Body control module (BCM) or wiper module internal fault (less common)
- Blown or poor ground causing circuit behavior to appear as a short to positive
Symptoms
- Rear wiper runs continuously or cannot be turned off
- Rear wiper park function fails or wiper stops in wrong position
- Rear wiper fuse blows repeatedly or other related fuses affected
- Battery drain when vehicle is off (if wiper powered constantly)
- Dash indicator/multiple body system warnings related to rear wiper
What to check
- Visually inspect the rear wiper relay, socket and associated connectors for corrosion, melted insulation or water ingress
- Check rear wiper fuse(s) for condition and correct rating
- With ignition OFF, disconnect the rear wiper relay and check if the fault clears or if circuit voltage to the control pin remains at battery +12V
- Perform a visual harness inspection along the path from relay to motor and BCM for chafe, pinched wiring or aftermarket splices
- Measure voltage at the relay control pin with a DMM: compare ignition OFF and ON, and when wiper is commanded
- Check for a good ground at the wiper motor and relay ground point
Signal parameters
- Control circuit (relay coil) inactive: ~0 V (or open circuit) with ignition off
- Control circuit active: ~12 V when relay is commanded ON (switch/module supplying +12 V or ground depending on design)
- Relay coil resistance (typical): ~50–200 ohms (varies by relay); compare to specification if available
- Motor power supply: ~12 V when wiper is commanded to run; near 0 V when not commanded (unless relay/wiring fault present)
Diagnostic algorithm
- Read and record freeze frame and number of occurrences; clear the DTC and see if it returns
- Attempt to reproduce the complaint (operate rear wiper through all modes) while observing behavior and lamp/fuse status
- Visually inspect relay, relay socket and wiring for damage, corrosion or water ingress
- Remove rear wiper relay and re-check voltage on the control circuit with ignition OFF — if still at +12 V, there is a short to positive downstream of relay or at the control wiring
- With relay removed, disconnect the rear wiper motor connector; check whether the short condition clears. If it clears, trace motor wiring and motor for internal short
- Backprobing: measure voltage between the control wire and chassis ground with ignition OFF and ON and while commanding the wiper. A constant ~12 V with no command indicates a short to battery
- Perform a resistance-to-battery test with ignition OFF: check for near‑zero ohms between the suspect control wire and B+ to confirm short (ensure power removed before resistance checks)
- Bench‑test or swap relay with a known good relay of same type to determine if relay is at fault
- If wiring and relay check good, test the BCM/wiper control module output for proper operation or intermittent faults; consult manufacturer wiring diagrams and component testing procedures
- After repairs, clear codes and perform a full function test; re-scan to ensure the DTC does not return
Likely causes
- Shorted/abraded wire contacting a chassis harness or bodywork and touching battery +12V at or near the rear wiper relay
- Failed relay with stuck/welded contact feeding +12V back into the control wire
- Water intrusion or corroded connector causing unintended continuity to positive
Fault status
Status
Stored fault: Rear wiper relay control circuit shorted to positive (B1245). Requires inspection of relay, harness and control module.
Repair difficulty: Medium
Diagnostic time: 0.5–1.5 hours
Your experience will help others
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Was this AI description helpful?
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0
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Code
B1245
LAND ROVER
B — Body
dynamic / Sports fashion button indicator
Views:
UK: 4
EN: 6
RU: 6
AI status
Completed
Completed
100%
Causes
- Shorted wiring in rear wiper relay/control circuit to battery positive
- Faulty or welded relay whose contact/coil is feeding +12V into the control circuit
- Corroded, damaged or water‑ingressed rear wiper relay connector or harness
- Incorrectly fitted aftermarket accessory or jump‑lead creating a feed to the circuit
- Body control module (BCM) or wiper module internal fault (less common)
- Blown or poor ground causing circuit behavior to appear as a short to positive
Symptoms
- Rear wiper runs continuously or cannot be turned off
- Rear wiper park function fails or wiper stops in wrong position
- Rear wiper fuse blows repeatedly or other related fuses affected
- Battery drain when vehicle is off (if wiper powered constantly)
- Dash indicator/multiple body system warnings related to rear wiper
What to check
- Visually inspect the rear wiper relay, socket and associated connectors for corrosion, melted insulation or water ingress
- Check rear wiper fuse(s) for condition and correct rating
- With ignition OFF, disconnect the rear wiper relay and check if the fault clears or if circuit voltage to the control pin remains at battery +12V
- Perform a visual harness inspection along the path from relay to motor and BCM for chafe, pinched wiring or aftermarket splices
- Measure voltage at the relay control pin with a DMM: compare ignition OFF and ON, and when wiper is commanded
- Check for a good ground at the wiper motor and relay ground point
Signal parameters
- Control circuit (relay coil) inactive: ~0 V (or open circuit) with ignition off
- Control circuit active: ~12 V when relay is commanded ON (switch/module supplying +12 V or ground depending on design)
- Relay coil resistance (typical): ~50–200 ohms (varies by relay); compare to specification if available
- Motor power supply: ~12 V when wiper is commanded to run; near 0 V when not commanded (unless relay/wiring fault present)
Diagnostic algorithm
- Read and record freeze frame and number of occurrences; clear the DTC and see if it returns
- Attempt to reproduce the complaint (operate rear wiper through all modes) while observing behavior and lamp/fuse status
- Visually inspect relay, relay socket and wiring for damage, corrosion or water ingress
- Remove rear wiper relay and re-check voltage on the control circuit with ignition OFF — if still at +12 V, there is a short to positive downstream of relay or at the control wiring
- With relay removed, disconnect the rear wiper motor connector; check whether the short condition clears. If it clears, trace motor wiring and motor for internal short
- Backprobing: measure voltage between the control wire and chassis ground with ignition OFF and ON and while commanding the wiper. A constant ~12 V with no command indicates a short to battery
- Perform a resistance-to-battery test with ignition OFF: check for near‑zero ohms between the suspect control wire and B+ to confirm short (ensure power removed before resistance checks)
- Bench‑test or swap relay with a known good relay of same type to determine if relay is at fault
- If wiring and relay check good, test the BCM/wiper control module output for proper operation or intermittent faults; consult manufacturer wiring diagrams and component testing procedures
- After repairs, clear codes and perform a full function test; re-scan to ensure the DTC does not return
Likely causes
- Shorted/abraded wire contacting a chassis harness or bodywork and touching battery +12V at or near the rear wiper relay
- Failed relay with stuck/welded contact feeding +12V back into the control wire
- Water intrusion or corroded connector causing unintended continuity to positive
Fault status
Status
Stored fault: Rear wiper relay control circuit shorted to positive (B1245). Requires inspection of relay, harness and control module.
Repair difficulty: Medium
Diagnostic time: 0.5–1.5 hours
Workshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop ManualLand Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop ManualLand Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop ManualYour experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
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Send to email
Code
B1245
Other
B — Body
Wiper Rear Motor Run Relay Circuit Short to Battery
Views:
UK: 20
EN: 29
RU: 18
AI status
Completed
Completed
100%
Causes
- Shorted wiring in rear wiper relay/control circuit to battery positive
- Faulty or welded relay whose contact/coil is feeding +12V into the control circuit
- Corroded, damaged or water‑ingressed rear wiper relay connector or harness
- Incorrectly fitted aftermarket accessory or jump‑lead creating a feed to the circuit
- Body control module (BCM) or wiper module internal fault (less common)
- Blown or poor ground causing circuit behavior to appear as a short to positive
Symptoms
- Rear wiper runs continuously or cannot be turned off
- Rear wiper park function fails or wiper stops in wrong position
- Rear wiper fuse blows repeatedly or other related fuses affected
- Battery drain when vehicle is off (if wiper powered constantly)
- Dash indicator/multiple body system warnings related to rear wiper
What to check
- Visually inspect the rear wiper relay, socket and associated connectors for corrosion, melted insulation or water ingress
- Check rear wiper fuse(s) for condition and correct rating
- With ignition OFF, disconnect the rear wiper relay and check if the fault clears or if circuit voltage to the control pin remains at battery +12V
- Perform a visual harness inspection along the path from relay to motor and BCM for chafe, pinched wiring or aftermarket splices
- Measure voltage at the relay control pin with a DMM: compare ignition OFF and ON, and when wiper is commanded
- Check for a good ground at the wiper motor and relay ground point
Signal parameters
- Control circuit (relay coil) inactive: ~0 V (or open circuit) with ignition off
- Control circuit active: ~12 V when relay is commanded ON (switch/module supplying +12 V or ground depending on design)
- Relay coil resistance (typical): ~50–200 ohms (varies by relay); compare to specification if available
- Motor power supply: ~12 V when wiper is commanded to run; near 0 V when not commanded (unless relay/wiring fault present)
Diagnostic algorithm
- Read and record freeze frame and number of occurrences; clear the DTC and see if it returns
- Attempt to reproduce the complaint (operate rear wiper through all modes) while observing behavior and lamp/fuse status
- Visually inspect relay, relay socket and wiring for damage, corrosion or water ingress
- Remove rear wiper relay and re-check voltage on the control circuit with ignition OFF — if still at +12 V, there is a short to positive downstream of relay or at the control wiring
- With relay removed, disconnect the rear wiper motor connector; check whether the short condition clears. If it clears, trace motor wiring and motor for internal short
- Backprobing: measure voltage between the control wire and chassis ground with ignition OFF and ON and while commanding the wiper. A constant ~12 V with no command indicates a short to battery
- Perform a resistance-to-battery test with ignition OFF: check for near‑zero ohms between the suspect control wire and B+ to confirm short (ensure power removed before resistance checks)
- Bench‑test or swap relay with a known good relay of same type to determine if relay is at fault
- If wiring and relay check good, test the BCM/wiper control module output for proper operation or intermittent faults; consult manufacturer wiring diagrams and component testing procedures
- After repairs, clear codes and perform a full function test; re-scan to ensure the DTC does not return
Likely causes
- Shorted/abraded wire contacting a chassis harness or bodywork and touching battery +12V at or near the rear wiper relay
- Failed relay with stuck/welded contact feeding +12V back into the control wire
- Water intrusion or corroded connector causing unintended continuity to positive
Fault status
Status
Stored fault: Rear wiper relay control circuit shorted to positive (B1245). Requires inspection of relay, harness and control module.
Repair difficulty: Medium
Diagnostic time: 0.5–1.5 hours
Workshop Manuals
Available brands with manuals
2
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Workshop ManualAudi A4 / A4 Cabriolet – 4.2 l V8 (5‑valve, timing chains) – Workshop Manual (Mechanics) – Edition 04.2007
Workshop ManualAudi A4 / A4 Cabriolet — Auxiliary Heater Workshop Manual (Edition 08.2004)
Workshop ManualAudi A4 / A4 Cabriolet (1.8T 4‑cyl turbo) — Motronic Injection & Ignition System Service Manual (Edition 01.2015)
Workshop ManualAudi A8 (2003) — Electrical System Workshop Manual (Edition 08.2014)
Workshop ManualAudi Q4 e-tron (Type F4) - Self-study Programme SSP 685
Workshop ManualAudi Q8 (2018) — Electrical System Workshop Manual (Edition 05.2019)
Workshop ManualAudi Servicing Manual — 7‑Speed Dual Clutch Transmission 0CJ / 0CL / 0CK / 0DN / 0DP / 0HL (Edition 05.2018)
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Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop ManualLand Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop ManualLand Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop ManualYour experience will help others
+100 karma for a short comment :)
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