Code
B1294
ALFA ROMEO
B — Body
Battery supply relay circuit short to positive
Views:
UK: 5
EN: 7
RU: 4
AI status
Completed
Completed
100%
Causes
- Damaged or chafed wiring harness making contact with battery positive or a fused battery feed
- Shorted relay (internal short between coil and supply or diode failure)
- Faulty relay socket/connector with corrosion or bridged terminals
- Aftermarket accessory hard-wired to a relay control circuit
- Faulty body control module / relay driver output stuck high
- Incorrectly routed or pinched harness at body seams or near metal edges
Symptoms
- Relevant relay does not switch correctly or is permanently energised
- Fuses for the relay feed blow repeatedly
- Parasitic battery drain or battery discharging overnight
- Related modules or functions inoperative (depending on what the relay supplies)
- Intermittent electrical faults or warning lights related to body electronics
What to check
- Read stored codes and freeze/frame data with a scan tool; note related codes and battery voltage
- Visually inspect relay, socket and related fuses for corrosion, heat damage or melted plastic
- Measure battery voltage (key off and key on) and monitor for abnormal high/constant voltage on relay control pin
- Disconnect relay and check for continuity from control pin to battery positive (should not be a short)
- Measure parasitic drain with accurate ammeter (negative battery clamp) with vehicle asleep
- Inspect wiring routing for chafes, pinches or aftermarket splices near battery or fusebox
Signal parameters
- Battery voltage at relay supply terminal: about 12.0–14.5 V (engine running)
- Control/coil pin voltage (key off): should be low/near 0 V (or open) unless designed as constant feed
- Control/coil pin voltage (when energised): near battery voltage (approx. 12 V) through driver or relay coil
- Coil resistance (relay removed and bench tested): typically 30–200 ohms depending on relay type
- Parasitic draw (vehicle asleep): typically
Diagnostic algorithm
- Record exact symptoms and economy of codes using an OBD scanner. Note battery voltage and any additional B or U codes.
- Visually inspect the relay, fusebox and wiring harness connected to the relay for heat damage, melted plastic, corrosion or aftermarket splices.
- With ignition off, remove the suspect relay. Check continuity from the relay control terminal to battery positive (B+). There should be no direct short. If there is continuity, isolate wiring section and inspect for chafes/bridges.
- Backprobe the relay connector with ignition on/off to verify control voltage behaviour. Confirm whether the control circuit is being driven high by a module or receiving backfeed.
- Swap the suspect relay with a known-good relay of the same type (if available) to check for change in behavior. Do not swap relays between circuits with different coil voltages or pilot functions.
- If swapping fixes the issue, replace the relay. If the short persists with the relay removed, trace wiring harness for short to B+ using resistance checks and visual inspection. Unplug connectors along the circuit to localise the short.
- If the wiring checks good and control pin is being held high without the relay, suspect BCM/body unit driver fault. Confirm by isolating the module per service manual and checking outputs; consult wiring diagram.
- After repair (wire repair, relay or module replacement), clear codes, reconnect battery, re-test operation and verify no parasitic drain and that the fault does not return.
- Safety note: Use proper fusing and protect circuits when bench-testing. Disconnect battery when performing harness repairs to avoid shorts and sparks.
Likely causes
- Shorted relay or relay internal diode failure
- Wiring harness insulation damaged where it contacts a constant 12 V source
- Corroded/bridged relay connector or blown fuse causing backfeed
- BCM/BCU (body control unit) driver transistor stuck on or damaged
Fault status
Status
Battery supply relay circuit short to positive detected — control circuit or relay feed is seeing unintended battery positive (B+). Investigate relay, connector, wiring and driver module for short or stuck/high output.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
B1294
FIAT
B — Body
Battery supply relay circuit short to positive
Views:
UK: 5
EN: 5
RU: 4
AI status
Completed
Completed
100%
Causes
- Damaged or chafed wiring harness making contact with battery positive or a fused battery feed
- Shorted relay (internal short between coil and supply or diode failure)
- Faulty relay socket/connector with corrosion or bridged terminals
- Aftermarket accessory hard-wired to a relay control circuit
- Faulty body control module / relay driver output stuck high
- Incorrectly routed or pinched harness at body seams or near metal edges
Symptoms
- Relevant relay does not switch correctly or is permanently energised
- Fuses for the relay feed blow repeatedly
- Parasitic battery drain or battery discharging overnight
- Related modules or functions inoperative (depending on what the relay supplies)
- Intermittent electrical faults or warning lights related to body electronics
What to check
- Read stored codes and freeze/frame data with a scan tool; note related codes and battery voltage
- Visually inspect relay, socket and related fuses for corrosion, heat damage or melted plastic
- Measure battery voltage (key off and key on) and monitor for abnormal high/constant voltage on relay control pin
- Disconnect relay and check for continuity from control pin to battery positive (should not be a short)
- Measure parasitic drain with accurate ammeter (negative battery clamp) with vehicle asleep
- Inspect wiring routing for chafes, pinches or aftermarket splices near battery or fusebox
Signal parameters
- Battery voltage at relay supply terminal: about 12.0–14.5 V (engine running)
- Control/coil pin voltage (key off): should be low/near 0 V (or open) unless designed as constant feed
- Control/coil pin voltage (when energised): near battery voltage (approx. 12 V) through driver or relay coil
- Coil resistance (relay removed and bench tested): typically 30–200 ohms depending on relay type
- Parasitic draw (vehicle asleep): typically
Diagnostic algorithm
- Record exact symptoms and economy of codes using an OBD scanner. Note battery voltage and any additional B or U codes.
- Visually inspect the relay, fusebox and wiring harness connected to the relay for heat damage, melted plastic, corrosion or aftermarket splices.
- With ignition off, remove the suspect relay. Check continuity from the relay control terminal to battery positive (B+). There should be no direct short. If there is continuity, isolate wiring section and inspect for chafes/bridges.
- Backprobe the relay connector with ignition on/off to verify control voltage behaviour. Confirm whether the control circuit is being driven high by a module or receiving backfeed.
- Swap the suspect relay with a known-good relay of the same type (if available) to check for change in behavior. Do not swap relays between circuits with different coil voltages or pilot functions.
- If swapping fixes the issue, replace the relay. If the short persists with the relay removed, trace wiring harness for short to B+ using resistance checks and visual inspection. Unplug connectors along the circuit to localise the short.
- If the wiring checks good and control pin is being held high without the relay, suspect BCM/body unit driver fault. Confirm by isolating the module per service manual and checking outputs; consult wiring diagram.
- After repair (wire repair, relay or module replacement), clear codes, reconnect battery, re-test operation and verify no parasitic drain and that the fault does not return.
- Safety note: Use proper fusing and protect circuits when bench-testing. Disconnect battery when performing harness repairs to avoid shorts and sparks.
Likely causes
- Shorted relay or relay internal diode failure
- Wiring harness insulation damaged where it contacts a constant 12 V source
- Corroded/bridged relay connector or blown fuse causing backfeed
- BCM/BCU (body control unit) driver transistor stuck on or damaged
Fault status
Status
Battery supply relay circuit short to positive detected — control circuit or relay feed is seeing unintended battery positive (B+). Investigate relay, connector, wiring and driver module for short or stuck/high output.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
B1294
LAND ROVER
B — Body
Climate control relay - short circuit in the battery
Views:
UK: 5
EN: 6
RU: 5
AI status
Completed
Completed
100%
Causes
- Damaged or chafed wiring harness making contact with battery positive or a fused battery feed
- Shorted relay (internal short between coil and supply or diode failure)
- Faulty relay socket/connector with corrosion or bridged terminals
- Aftermarket accessory hard-wired to a relay control circuit
- Faulty body control module / relay driver output stuck high
- Incorrectly routed or pinched harness at body seams or near metal edges
Symptoms
- Relevant relay does not switch correctly or is permanently energised
- Fuses for the relay feed blow repeatedly
- Parasitic battery drain or battery discharging overnight
- Related modules or functions inoperative (depending on what the relay supplies)
- Intermittent electrical faults or warning lights related to body electronics
What to check
- Read stored codes and freeze/frame data with a scan tool; note related codes and battery voltage
- Visually inspect relay, socket and related fuses for corrosion, heat damage or melted plastic
- Measure battery voltage (key off and key on) and monitor for abnormal high/constant voltage on relay control pin
- Disconnect relay and check for continuity from control pin to battery positive (should not be a short)
- Measure parasitic drain with accurate ammeter (negative battery clamp) with vehicle asleep
- Inspect wiring routing for chafes, pinches or aftermarket splices near battery or fusebox
Signal parameters
- Battery voltage at relay supply terminal: about 12.0–14.5 V (engine running)
- Control/coil pin voltage (key off): should be low/near 0 V (or open) unless designed as constant feed
- Control/coil pin voltage (when energised): near battery voltage (approx. 12 V) through driver or relay coil
- Coil resistance (relay removed and bench tested): typically 30–200 ohms depending on relay type
- Parasitic draw (vehicle asleep): typically
Diagnostic algorithm
- Record exact symptoms and economy of codes using an OBD scanner. Note battery voltage and any additional B or U codes.
- Visually inspect the relay, fusebox and wiring harness connected to the relay for heat damage, melted plastic, corrosion or aftermarket splices.
- With ignition off, remove the suspect relay. Check continuity from the relay control terminal to battery positive (B+). There should be no direct short. If there is continuity, isolate wiring section and inspect for chafes/bridges.
- Backprobe the relay connector with ignition on/off to verify control voltage behaviour. Confirm whether the control circuit is being driven high by a module or receiving backfeed.
- Swap the suspect relay with a known-good relay of the same type (if available) to check for change in behavior. Do not swap relays between circuits with different coil voltages or pilot functions.
- If swapping fixes the issue, replace the relay. If the short persists with the relay removed, trace wiring harness for short to B+ using resistance checks and visual inspection. Unplug connectors along the circuit to localise the short.
- If the wiring checks good and control pin is being held high without the relay, suspect BCM/body unit driver fault. Confirm by isolating the module per service manual and checking outputs; consult wiring diagram.
- After repair (wire repair, relay or module replacement), clear codes, reconnect battery, re-test operation and verify no parasitic drain and that the fault does not return.
- Safety note: Use proper fusing and protect circuits when bench-testing. Disconnect battery when performing harness repairs to avoid shorts and sparks.
Likely causes
- Shorted relay or relay internal diode failure
- Wiring harness insulation damaged where it contacts a constant 12 V source
- Corroded/bridged relay connector or blown fuse causing backfeed
- BCM/BCU (body control unit) driver transistor stuck on or damaged
Fault status
Status
Battery supply relay circuit short to positive detected — control circuit or relay feed is seeing unintended battery positive (B+). Investigate relay, connector, wiring and driver module for short or stuck/high output.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
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Send to email
Code
B1294
Other
B — Body
Battery Power Relay Circuit Short To Battery
Views:
UK: 13
EN: 16
RU: 10
AI status
Completed
Completed
100%
Causes
- Damaged or chafed wiring harness making contact with battery positive or a fused battery feed
- Shorted relay (internal short between coil and supply or diode failure)
- Faulty relay socket/connector with corrosion or bridged terminals
- Aftermarket accessory hard-wired to a relay control circuit
- Faulty body control module / relay driver output stuck high
- Incorrectly routed or pinched harness at body seams or near metal edges
Symptoms
- Relevant relay does not switch correctly or is permanently energised
- Fuses for the relay feed blow repeatedly
- Parasitic battery drain or battery discharging overnight
- Related modules or functions inoperative (depending on what the relay supplies)
- Intermittent electrical faults or warning lights related to body electronics
What to check
- Read stored codes and freeze/frame data with a scan tool; note related codes and battery voltage
- Visually inspect relay, socket and related fuses for corrosion, heat damage or melted plastic
- Measure battery voltage (key off and key on) and monitor for abnormal high/constant voltage on relay control pin
- Disconnect relay and check for continuity from control pin to battery positive (should not be a short)
- Measure parasitic drain with accurate ammeter (negative battery clamp) with vehicle asleep
- Inspect wiring routing for chafes, pinches or aftermarket splices near battery or fusebox
Signal parameters
- Battery voltage at relay supply terminal: about 12.0–14.5 V (engine running)
- Control/coil pin voltage (key off): should be low/near 0 V (or open) unless designed as constant feed
- Control/coil pin voltage (when energised): near battery voltage (approx. 12 V) through driver or relay coil
- Coil resistance (relay removed and bench tested): typically 30–200 ohms depending on relay type
- Parasitic draw (vehicle asleep): typically
Diagnostic algorithm
- Record exact symptoms and economy of codes using an OBD scanner. Note battery voltage and any additional B or U codes.
- Visually inspect the relay, fusebox and wiring harness connected to the relay for heat damage, melted plastic, corrosion or aftermarket splices.
- With ignition off, remove the suspect relay. Check continuity from the relay control terminal to battery positive (B+). There should be no direct short. If there is continuity, isolate wiring section and inspect for chafes/bridges.
- Backprobe the relay connector with ignition on/off to verify control voltage behaviour. Confirm whether the control circuit is being driven high by a module or receiving backfeed.
- Swap the suspect relay with a known-good relay of the same type (if available) to check for change in behavior. Do not swap relays between circuits with different coil voltages or pilot functions.
- If swapping fixes the issue, replace the relay. If the short persists with the relay removed, trace wiring harness for short to B+ using resistance checks and visual inspection. Unplug connectors along the circuit to localise the short.
- If the wiring checks good and control pin is being held high without the relay, suspect BCM/body unit driver fault. Confirm by isolating the module per service manual and checking outputs; consult wiring diagram.
- After repair (wire repair, relay or module replacement), clear codes, reconnect battery, re-test operation and verify no parasitic drain and that the fault does not return.
- Safety note: Use proper fusing and protect circuits when bench-testing. Disconnect battery when performing harness repairs to avoid shorts and sparks.
Likely causes
- Shorted relay or relay internal diode failure
- Wiring harness insulation damaged where it contacts a constant 12 V source
- Corroded/bridged relay connector or blown fuse causing backfeed
- BCM/BCU (body control unit) driver transistor stuck on or damaged
Fault status
Status
Battery supply relay circuit short to positive detected — control circuit or relay feed is seeing unintended battery positive (B+). Investigate relay, connector, wiring and driver module for short or stuck/high output.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
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