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Home / DTC / B1293 — Battery supply relay circuit open

B1293 — Battery supply relay circuit open

Detailed page for trouble code B1293.

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Code

B1293

ALFA ROMEO B — Body

Battery supply relay circuit open

Brand: ALFA ROMEO
Type: B — Body
Views: UK: 23 EN: 18 RU: 20
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or broken wire in relay supply or control circuit
  • Faulty battery supply relay (coil or contacts open)
  • Blown fuse or fusible link feeding the relay
  • Corroded/loose relay socket or connector
  • Poor or missing ground at relay or control module
  • Faulty body/electronic control module output

Symptoms

  • No power to systems that are switched through the battery supply relay (depending on vehicle architecture)
  • Starter, fuel pump, or ECUs may not receive battery feed; vehicle may not start or accessory power is lost
  • Battery warning or electrical system warnings on dash
  • Intermittent electrical faults or modules failing to wake/sleep
  • DTC stored and possibly inability to clear until circuit fixed

What to check

  • Read stored codes and freeze frame with a scan tool; note related codes and voltage status
  • Visually inspect relay, relay socket and related connectors for corrosion, burning or damage
  • Check relevant fuse(s) and fusible links for continuity
  • Measure battery voltage (engine off and running) to ensure adequate supply before tests
  • Check wiring continuity between battery, fuse, relay supply terminal and control module output
  • Measure control/coil voltage at the relay with ignition ON and when commanded

Signal parameters

  • Battery voltage at relay supply terminal: ~11.5–14.5 V (should be near battery voltage with ignition on)
  • Relay coil/control signal: 0 V (not energized) or battery voltage (~12 V) when the module commands the relay closed
  • Coil resistance (typical automotive relay): ~50–150 ohms (refer to vehicle-specific spec)
  • Continuity from battery positive to relay supply terminal: near 0 ohms (no open circuit)
  • Control module output pin resistance to coil: low when commanded (check against factory spec)

Diagnostic algorithm

  1. Confirm the code and note any additional DTCs; record battery voltage.
  2. Inspect externally visible wiring, relay socket and fuses for damage, corrosion or loose connections.
  3. Verify fuse/fusible link continuity that feeds the relay; replace if blown and re-test.
  4. With ignition OFF, remove relay and measure coil resistance. Compare to specification or typical 50–150 ohms.
  5. Reinstall relay and with ignition ON, measure supply terminal voltage and coil/control pin voltage while commanding the circuit with a scan tool or ignition sequence.
  6. If relay does not energize then supply voltage is missing or control signal not present — trace continuity from battery positive through fuse to relay supply; repair any open circuit.
  7. If supply and control signal are present but relay does not switch, replace the relay and re-test.
  8. If control signal is absent, test continuity and voltage at control module pin; check module ground and refer to wiring diagram. Repair harness or connector as needed.
  9. After repairs, clear codes and perform functional test/road test to confirm the fault does not return.
  10. If wiring and relay are good but control output fails, consider module diagnostics or replacement per manufacturer procedures.

Likely causes

  • Defective or stuck-open battery supply relay
  • Open or intermittent wiring between battery, fuse and relay (damaged harness, chafing, connector)
  • Blown fuse or fusible link supplying the relay
  • Corroded/loose relay connector or poor ground
  • Faulty control module driver (less common)

Fault status

⚠️ Status
Battery supply relay circuit open — open circuit detected in the battery feed or control circuit to the relay, preventing relay activation.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

Similar codes

B1290 B1291 B1292 B1294 P0562 P0563
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Code

B1293

FIAT B — Body

Battery supply relay circuit open

Brand: FIAT
Type: B — Body
Views: UK: 25 EN: 27 RU: 23
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or broken wire in relay supply or control circuit
  • Faulty battery supply relay (coil or contacts open)
  • Blown fuse or fusible link feeding the relay
  • Corroded/loose relay socket or connector
  • Poor or missing ground at relay or control module
  • Faulty body/electronic control module output

Symptoms

  • No power to systems that are switched through the battery supply relay (depending on vehicle architecture)
  • Starter, fuel pump, or ECUs may not receive battery feed; vehicle may not start or accessory power is lost
  • Battery warning or electrical system warnings on dash
  • Intermittent electrical faults or modules failing to wake/sleep
  • DTC stored and possibly inability to clear until circuit fixed

What to check

  • Read stored codes and freeze frame with a scan tool; note related codes and voltage status
  • Visually inspect relay, relay socket and related connectors for corrosion, burning or damage
  • Check relevant fuse(s) and fusible links for continuity
  • Measure battery voltage (engine off and running) to ensure adequate supply before tests
  • Check wiring continuity between battery, fuse, relay supply terminal and control module output
  • Measure control/coil voltage at the relay with ignition ON and when commanded

Signal parameters

  • Battery voltage at relay supply terminal: ~11.5–14.5 V (should be near battery voltage with ignition on)
  • Relay coil/control signal: 0 V (not energized) or battery voltage (~12 V) when the module commands the relay closed
  • Coil resistance (typical automotive relay): ~50–150 ohms (refer to vehicle-specific spec)
  • Continuity from battery positive to relay supply terminal: near 0 ohms (no open circuit)
  • Control module output pin resistance to coil: low when commanded (check against factory spec)

Diagnostic algorithm

  1. Confirm the code and note any additional DTCs; record battery voltage.
  2. Inspect externally visible wiring, relay socket and fuses for damage, corrosion or loose connections.
  3. Verify fuse/fusible link continuity that feeds the relay; replace if blown and re-test.
  4. With ignition OFF, remove relay and measure coil resistance. Compare to specification or typical 50–150 ohms.
  5. Reinstall relay and with ignition ON, measure supply terminal voltage and coil/control pin voltage while commanding the circuit with a scan tool or ignition sequence.
  6. If relay does not energize then supply voltage is missing or control signal not present — trace continuity from battery positive through fuse to relay supply; repair any open circuit.
  7. If supply and control signal are present but relay does not switch, replace the relay and re-test.
  8. If control signal is absent, test continuity and voltage at control module pin; check module ground and refer to wiring diagram. Repair harness or connector as needed.
  9. After repairs, clear codes and perform functional test/road test to confirm the fault does not return.
  10. If wiring and relay are good but control output fails, consider module diagnostics or replacement per manufacturer procedures.

Likely causes

  • Defective or stuck-open battery supply relay
  • Open or intermittent wiring between battery, fuse and relay (damaged harness, chafing, connector)
  • Blown fuse or fusible link supplying the relay
  • Corroded/loose relay connector or poor ground
  • Faulty control module driver (less common)

Fault status

⚠️ Status
Battery supply relay circuit open — open circuit detected in the battery feed or control circuit to the relay, preventing relay activation.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

Similar codes

B1290 B1291 B1292 B1294 P0562 P0563
Repair manuals

Manual library for FIAT

29

Browse 29 FIAT manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

FIAT

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Code

B1293

LAND ROVER B — Body

Speaker 22

Brand: LAND ROVER
Type: B — Body
Views: UK: 19 EN: 20 RU: 15
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or broken wire in relay supply or control circuit
  • Faulty battery supply relay (coil or contacts open)
  • Blown fuse or fusible link feeding the relay
  • Corroded/loose relay socket or connector
  • Poor or missing ground at relay or control module
  • Faulty body/electronic control module output

Symptoms

  • No power to systems that are switched through the battery supply relay (depending on vehicle architecture)
  • Starter, fuel pump, or ECUs may not receive battery feed; vehicle may not start or accessory power is lost
  • Battery warning or electrical system warnings on dash
  • Intermittent electrical faults or modules failing to wake/sleep
  • DTC stored and possibly inability to clear until circuit fixed

What to check

  • Read stored codes and freeze frame with a scan tool; note related codes and voltage status
  • Visually inspect relay, relay socket and related connectors for corrosion, burning or damage
  • Check relevant fuse(s) and fusible links for continuity
  • Measure battery voltage (engine off and running) to ensure adequate supply before tests
  • Check wiring continuity between battery, fuse, relay supply terminal and control module output
  • Measure control/coil voltage at the relay with ignition ON and when commanded

Signal parameters

  • Battery voltage at relay supply terminal: ~11.5–14.5 V (should be near battery voltage with ignition on)
  • Relay coil/control signal: 0 V (not energized) or battery voltage (~12 V) when the module commands the relay closed
  • Coil resistance (typical automotive relay): ~50–150 ohms (refer to vehicle-specific spec)
  • Continuity from battery positive to relay supply terminal: near 0 ohms (no open circuit)
  • Control module output pin resistance to coil: low when commanded (check against factory spec)

Diagnostic algorithm

  1. Confirm the code and note any additional DTCs; record battery voltage.
  2. Inspect externally visible wiring, relay socket and fuses for damage, corrosion or loose connections.
  3. Verify fuse/fusible link continuity that feeds the relay; replace if blown and re-test.
  4. With ignition OFF, remove relay and measure coil resistance. Compare to specification or typical 50–150 ohms.
  5. Reinstall relay and with ignition ON, measure supply terminal voltage and coil/control pin voltage while commanding the circuit with a scan tool or ignition sequence.
  6. If relay does not energize then supply voltage is missing or control signal not present — trace continuity from battery positive through fuse to relay supply; repair any open circuit.
  7. If supply and control signal are present but relay does not switch, replace the relay and re-test.
  8. If control signal is absent, test continuity and voltage at control module pin; check module ground and refer to wiring diagram. Repair harness or connector as needed.
  9. After repairs, clear codes and perform functional test/road test to confirm the fault does not return.
  10. If wiring and relay are good but control output fails, consider module diagnostics or replacement per manufacturer procedures.

Likely causes

  • Defective or stuck-open battery supply relay
  • Open or intermittent wiring between battery, fuse and relay (damaged harness, chafing, connector)
  • Blown fuse or fusible link supplying the relay
  • Corroded/loose relay connector or poor ground
  • Faulty control module driver (less common)

Fault status

⚠️ Status
Battery supply relay circuit open — open circuit detected in the battery feed or control circuit to the relay, preventing relay activation.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

Similar codes

B1290 B1291 B1292 B1294 P0562 P0563
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.
Send to email
Code

B1293

Other B — Body

Battery Power Relay Circuit Open

Brand: Other
Type: B — Body
Views: UK: 28 EN: 31 RU: 19
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or broken wire in relay supply or control circuit
  • Faulty battery supply relay (coil or contacts open)
  • Blown fuse or fusible link feeding the relay
  • Corroded/loose relay socket or connector
  • Poor or missing ground at relay or control module
  • Faulty body/electronic control module output

Symptoms

  • No power to systems that are switched through the battery supply relay (depending on vehicle architecture)
  • Starter, fuel pump, or ECUs may not receive battery feed; vehicle may not start or accessory power is lost
  • Battery warning or electrical system warnings on dash
  • Intermittent electrical faults or modules failing to wake/sleep
  • DTC stored and possibly inability to clear until circuit fixed

What to check

  • Read stored codes and freeze frame with a scan tool; note related codes and voltage status
  • Visually inspect relay, relay socket and related connectors for corrosion, burning or damage
  • Check relevant fuse(s) and fusible links for continuity
  • Measure battery voltage (engine off and running) to ensure adequate supply before tests
  • Check wiring continuity between battery, fuse, relay supply terminal and control module output
  • Measure control/coil voltage at the relay with ignition ON and when commanded

Signal parameters

  • Battery voltage at relay supply terminal: ~11.5–14.5 V (should be near battery voltage with ignition on)
  • Relay coil/control signal: 0 V (not energized) or battery voltage (~12 V) when the module commands the relay closed
  • Coil resistance (typical automotive relay): ~50–150 ohms (refer to vehicle-specific spec)
  • Continuity from battery positive to relay supply terminal: near 0 ohms (no open circuit)
  • Control module output pin resistance to coil: low when commanded (check against factory spec)

Diagnostic algorithm

  1. Confirm the code and note any additional DTCs; record battery voltage.
  2. Inspect externally visible wiring, relay socket and fuses for damage, corrosion or loose connections.
  3. Verify fuse/fusible link continuity that feeds the relay; replace if blown and re-test.
  4. With ignition OFF, remove relay and measure coil resistance. Compare to specification or typical 50–150 ohms.
  5. Reinstall relay and with ignition ON, measure supply terminal voltage and coil/control pin voltage while commanding the circuit with a scan tool or ignition sequence.
  6. If relay does not energize then supply voltage is missing or control signal not present — trace continuity from battery positive through fuse to relay supply; repair any open circuit.
  7. If supply and control signal are present but relay does not switch, replace the relay and re-test.
  8. If control signal is absent, test continuity and voltage at control module pin; check module ground and refer to wiring diagram. Repair harness or connector as needed.
  9. After repairs, clear codes and perform functional test/road test to confirm the fault does not return.
  10. If wiring and relay are good but control output fails, consider module diagnostics or replacement per manufacturer procedures.

Likely causes

  • Defective or stuck-open battery supply relay
  • Open or intermittent wiring between battery, fuse and relay (damaged harness, chafing, connector)
  • Blown fuse or fusible link supplying the relay
  • Corroded/loose relay connector or poor ground
  • Faulty control module driver (less common)

Fault status

⚠️ Status
Battery supply relay circuit open — open circuit detected in the battery feed or control circuit to the relay, preventing relay activation.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

Similar codes

B1290 B1291 B1292 B1294 P0562 P0563
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