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Home / DTC / B1294 — Battery supply relay circuit short to positive

B1294 — Battery supply relay circuit short to positive

Detailed page for trouble code B1294.

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59brands
11,914generic
22,491specific
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Code

B1294

ALFA ROMEO B — Body

Battery supply relay circuit short to positive

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

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

  1. Record exact symptoms and economy of codes using an OBD scanner. Note battery voltage and any additional B or U codes.
  2. Visually inspect the relay, fusebox and wiring harness connected to the relay for heat damage, melted plastic, corrosion or aftermarket splices.
  3. 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.
  4. 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.
  5. 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.
  6. 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.
  7. 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.
  8. 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.
  9. 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

B1293 B1295 P0562 P0563 U0121
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

B1294

FIAT B — Body

Battery supply relay circuit short to positive

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

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

  1. Record exact symptoms and economy of codes using an OBD scanner. Note battery voltage and any additional B or U codes.
  2. Visually inspect the relay, fusebox and wiring harness connected to the relay for heat damage, melted plastic, corrosion or aftermarket splices.
  3. 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.
  4. 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.
  5. 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.
  6. 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.
  7. 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.
  8. 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.
  9. 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

B1293 B1295 P0562 P0563 U0121
Repair manuals

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Code

B1294

LAND ROVER B — Body

Climate control relay - short circuit in the battery

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

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

  1. Record exact symptoms and economy of codes using an OBD scanner. Note battery voltage and any additional B or U codes.
  2. Visually inspect the relay, fusebox and wiring harness connected to the relay for heat damage, melted plastic, corrosion or aftermarket splices.
  3. 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.
  4. 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.
  5. 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.
  6. 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.
  7. 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.
  8. 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.
  9. 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

B1293 B1295 P0562 P0563 U0121
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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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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Code

B1294

Other B — Body

Battery Power Relay Circuit Short To Battery

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

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

  1. Record exact symptoms and economy of codes using an OBD scanner. Note battery voltage and any additional B or U codes.
  2. Visually inspect the relay, fusebox and wiring harness connected to the relay for heat damage, melted plastic, corrosion or aftermarket splices.
  3. 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.
  4. 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.
  5. 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.
  6. 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.
  7. 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.
  8. 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.
  9. 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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