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Home / DTC / B1314 — Battery saver relay coil circuit open

B1314 — Battery saver relay coil circuit open

Detailed page for trouble code B1314.

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22,491specific
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Code

B1314

ALFA ROMEO B — Body

Battery saver relay coil circuit open

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

Causes

  • Open or damaged wiring between BCM/body control module and battery saver relay coil
  • Corroded, loose or disconnected relay connector or terminals
  • Faulty battery saver relay (open coil)
  • Blown fuse or fusible link protecting the relay coil circuit
  • Faulty BCM/body control module driver (open control transistor)
  • Poor ground at relay coil or related grounds

Symptoms

  • Battery saver feature does not engage (accessories remain powered)
  • Parasitic battery drain or premature battery discharge
  • Accessories not switching off automatically with ignition off
  • Possible interior lighting or convenience features staying on
  • Possible related warning messages or stored body module errors

What to check

  • Read stored codes and freeze frame with scan tool; confirm B1314 is current or historic
  • Perform visual inspection of relay, harness, connector and related fuses for damage or corrosion
  • Verify vehicle battery voltage is healthy (12.4–12.8V at rest)
  • Check fuse and any inline fuse link for continuity
  • With ignition in the state that should command battery saver, use scan tool to actuate battery saver relay (if available) and listen/observe for relay click
  • Probe relay coil terminals for voltage while commanding relay from scan tool or turning ignition to the state that should energize coil

Signal parameters

  • Relay coil voltage when commanded: approximately battery voltage (11–14.5 V) at coil supply terminal
  • Relay coil voltage when not commanded: ~0 V at control/driver terminal (may see pull-down or low voltage)
  • Relay coil resistance (typical): 50–200 ohms (manufacturer-specific; compare to known-good relay)
  • Continuity: supply fuse to relay coil terminal should show near 0 ohms (
  • Ground continuity: relay coil ground to battery negative: near 0 ohms (

Diagnostic algorithm

  1. Safety first: ensure vehicle is parked, ignition off, and battery stable; use PPE and follow manufacturer procedures.
  2. Retrieve freeze frame and confirm B1314 is present; clear code and attempt to re-create to verify active condition.
  3. Visually inspect relay, socket, harness, and all visible wiring for damage, corrosion, loose pins or water ingress. Repair as needed.
  4. Check relevant fuses and fusible links for continuity; replace any blown fuses.
  5. With relay in place, backprobe relay coil supply and coil control pins. Command the battery saver function from a scan tool or switch to the state that should energize the relay and observe coil supply and control voltages. Expect battery voltage on supply and battery or near 0 V on control depending on driver type.
  6. If no coil supply, trace and repair open circuit from fuse/power source to relay. If coil supply present but no control drive, test continuity between BCM control pin and relay connector; inspect connector and wiring for opens.
  7. Remove relay and measure coil resistance on bench. If coil is open (infinite resistance), replace relay. If resistance is within spec, reinstall and re-test.
  8. If wiring and relay are good but no control signal from BCM, check BCM driver output with oscilloscope or multimeter and verify ground references. If BCM output is missing or stuck, consider BCM software update or replacement per manufacturer guidance.
  9. After repairs, clear codes, operate vehicle through relevant cycles, and verify code does not return and battery saver function operates normally.

Likely causes

  • Broken or pinched conductor in harness to relay coil
  • Corroded relay socket terminals or water ingress
  • Battery saver relay coil internally open
  • Blown in-line fuse supplying relay coil
  • Connector not fully seated after service

Fault status

⚠️ Status
Battery saver relay coil circuit open — circuit continuity or control drive to relay coil not detected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1310 B1313 B1315 B1316
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

B1314

FIAT B — Body

Battery saver relay coil circuit open

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

Causes

  • Open or damaged wiring between BCM/body control module and battery saver relay coil
  • Corroded, loose or disconnected relay connector or terminals
  • Faulty battery saver relay (open coil)
  • Blown fuse or fusible link protecting the relay coil circuit
  • Faulty BCM/body control module driver (open control transistor)
  • Poor ground at relay coil or related grounds

Symptoms

  • Battery saver feature does not engage (accessories remain powered)
  • Parasitic battery drain or premature battery discharge
  • Accessories not switching off automatically with ignition off
  • Possible interior lighting or convenience features staying on
  • Possible related warning messages or stored body module errors

What to check

  • Read stored codes and freeze frame with scan tool; confirm B1314 is current or historic
  • Perform visual inspection of relay, harness, connector and related fuses for damage or corrosion
  • Verify vehicle battery voltage is healthy (12.4–12.8V at rest)
  • Check fuse and any inline fuse link for continuity
  • With ignition in the state that should command battery saver, use scan tool to actuate battery saver relay (if available) and listen/observe for relay click
  • Probe relay coil terminals for voltage while commanding relay from scan tool or turning ignition to the state that should energize coil

Signal parameters

  • Relay coil voltage when commanded: approximately battery voltage (11–14.5 V) at coil supply terminal
  • Relay coil voltage when not commanded: ~0 V at control/driver terminal (may see pull-down or low voltage)
  • Relay coil resistance (typical): 50–200 ohms (manufacturer-specific; compare to known-good relay)
  • Continuity: supply fuse to relay coil terminal should show near 0 ohms (
  • Ground continuity: relay coil ground to battery negative: near 0 ohms (

Diagnostic algorithm

  1. Safety first: ensure vehicle is parked, ignition off, and battery stable; use PPE and follow manufacturer procedures.
  2. Retrieve freeze frame and confirm B1314 is present; clear code and attempt to re-create to verify active condition.
  3. Visually inspect relay, socket, harness, and all visible wiring for damage, corrosion, loose pins or water ingress. Repair as needed.
  4. Check relevant fuses and fusible links for continuity; replace any blown fuses.
  5. With relay in place, backprobe relay coil supply and coil control pins. Command the battery saver function from a scan tool or switch to the state that should energize the relay and observe coil supply and control voltages. Expect battery voltage on supply and battery or near 0 V on control depending on driver type.
  6. If no coil supply, trace and repair open circuit from fuse/power source to relay. If coil supply present but no control drive, test continuity between BCM control pin and relay connector; inspect connector and wiring for opens.
  7. Remove relay and measure coil resistance on bench. If coil is open (infinite resistance), replace relay. If resistance is within spec, reinstall and re-test.
  8. If wiring and relay are good but no control signal from BCM, check BCM driver output with oscilloscope or multimeter and verify ground references. If BCM output is missing or stuck, consider BCM software update or replacement per manufacturer guidance.
  9. After repairs, clear codes, operate vehicle through relevant cycles, and verify code does not return and battery saver function operates normally.

Likely causes

  • Broken or pinched conductor in harness to relay coil
  • Corroded relay socket terminals or water ingress
  • Battery saver relay coil internally open
  • Blown in-line fuse supplying relay coil
  • Connector not fully seated after service

Fault status

⚠️ Status
Battery saver relay coil circuit open — circuit continuity or control drive to relay coil not detected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1310 B1313 B1315 B1316
Repair manuals

Manual library for FIAT

26

Browse 26 FIAT manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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Code

B1314

HUMMER B — Body

Evaporator Inlet Temp Sensor Open Circuit

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

Causes

  • Open or damaged wiring between BCM/body control module and battery saver relay coil
  • Corroded, loose or disconnected relay connector or terminals
  • Faulty battery saver relay (open coil)
  • Blown fuse or fusible link protecting the relay coil circuit
  • Faulty BCM/body control module driver (open control transistor)
  • Poor ground at relay coil or related grounds

Symptoms

  • Battery saver feature does not engage (accessories remain powered)
  • Parasitic battery drain or premature battery discharge
  • Accessories not switching off automatically with ignition off
  • Possible interior lighting or convenience features staying on
  • Possible related warning messages or stored body module errors

What to check

  • Read stored codes and freeze frame with scan tool; confirm B1314 is current or historic
  • Perform visual inspection of relay, harness, connector and related fuses for damage or corrosion
  • Verify vehicle battery voltage is healthy (12.4–12.8V at rest)
  • Check fuse and any inline fuse link for continuity
  • With ignition in the state that should command battery saver, use scan tool to actuate battery saver relay (if available) and listen/observe for relay click
  • Probe relay coil terminals for voltage while commanding relay from scan tool or turning ignition to the state that should energize coil

Signal parameters

  • Relay coil voltage when commanded: approximately battery voltage (11–14.5 V) at coil supply terminal
  • Relay coil voltage when not commanded: ~0 V at control/driver terminal (may see pull-down or low voltage)
  • Relay coil resistance (typical): 50–200 ohms (manufacturer-specific; compare to known-good relay)
  • Continuity: supply fuse to relay coil terminal should show near 0 ohms (
  • Ground continuity: relay coil ground to battery negative: near 0 ohms (

Diagnostic algorithm

  1. Safety first: ensure vehicle is parked, ignition off, and battery stable; use PPE and follow manufacturer procedures.
  2. Retrieve freeze frame and confirm B1314 is present; clear code and attempt to re-create to verify active condition.
  3. Visually inspect relay, socket, harness, and all visible wiring for damage, corrosion, loose pins or water ingress. Repair as needed.
  4. Check relevant fuses and fusible links for continuity; replace any blown fuses.
  5. With relay in place, backprobe relay coil supply and coil control pins. Command the battery saver function from a scan tool or switch to the state that should energize the relay and observe coil supply and control voltages. Expect battery voltage on supply and battery or near 0 V on control depending on driver type.
  6. If no coil supply, trace and repair open circuit from fuse/power source to relay. If coil supply present but no control drive, test continuity between BCM control pin and relay connector; inspect connector and wiring for opens.
  7. Remove relay and measure coil resistance on bench. If coil is open (infinite resistance), replace relay. If resistance is within spec, reinstall and re-test.
  8. If wiring and relay are good but no control signal from BCM, check BCM driver output with oscilloscope or multimeter and verify ground references. If BCM output is missing or stuck, consider BCM software update or replacement per manufacturer guidance.
  9. After repairs, clear codes, operate vehicle through relevant cycles, and verify code does not return and battery saver function operates normally.

Likely causes

  • Broken or pinched conductor in harness to relay coil
  • Corroded relay socket terminals or water ingress
  • Battery saver relay coil internally open
  • Blown in-line fuse supplying relay coil
  • Connector not fully seated after service

Fault status

⚠️ Status
Battery saver relay coil circuit open — circuit continuity or control drive to relay coil not detected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1310 B1313 B1315 B1316
Repair manuals

Manual library for HUMMER

138

Browse 138 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

HUMMER

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Code

B1314

LAND ROVER B — Body

Battery saving relay coil - open circuit

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

Causes

  • Open or damaged wiring between BCM/body control module and battery saver relay coil
  • Corroded, loose or disconnected relay connector or terminals
  • Faulty battery saver relay (open coil)
  • Blown fuse or fusible link protecting the relay coil circuit
  • Faulty BCM/body control module driver (open control transistor)
  • Poor ground at relay coil or related grounds

Symptoms

  • Battery saver feature does not engage (accessories remain powered)
  • Parasitic battery drain or premature battery discharge
  • Accessories not switching off automatically with ignition off
  • Possible interior lighting or convenience features staying on
  • Possible related warning messages or stored body module errors

What to check

  • Read stored codes and freeze frame with scan tool; confirm B1314 is current or historic
  • Perform visual inspection of relay, harness, connector and related fuses for damage or corrosion
  • Verify vehicle battery voltage is healthy (12.4–12.8V at rest)
  • Check fuse and any inline fuse link for continuity
  • With ignition in the state that should command battery saver, use scan tool to actuate battery saver relay (if available) and listen/observe for relay click
  • Probe relay coil terminals for voltage while commanding relay from scan tool or turning ignition to the state that should energize coil

Signal parameters

  • Relay coil voltage when commanded: approximately battery voltage (11–14.5 V) at coil supply terminal
  • Relay coil voltage when not commanded: ~0 V at control/driver terminal (may see pull-down or low voltage)
  • Relay coil resistance (typical): 50–200 ohms (manufacturer-specific; compare to known-good relay)
  • Continuity: supply fuse to relay coil terminal should show near 0 ohms (
  • Ground continuity: relay coil ground to battery negative: near 0 ohms (

Diagnostic algorithm

  1. Safety first: ensure vehicle is parked, ignition off, and battery stable; use PPE and follow manufacturer procedures.
  2. Retrieve freeze frame and confirm B1314 is present; clear code and attempt to re-create to verify active condition.
  3. Visually inspect relay, socket, harness, and all visible wiring for damage, corrosion, loose pins or water ingress. Repair as needed.
  4. Check relevant fuses and fusible links for continuity; replace any blown fuses.
  5. With relay in place, backprobe relay coil supply and coil control pins. Command the battery saver function from a scan tool or switch to the state that should energize the relay and observe coil supply and control voltages. Expect battery voltage on supply and battery or near 0 V on control depending on driver type.
  6. If no coil supply, trace and repair open circuit from fuse/power source to relay. If coil supply present but no control drive, test continuity between BCM control pin and relay connector; inspect connector and wiring for opens.
  7. Remove relay and measure coil resistance on bench. If coil is open (infinite resistance), replace relay. If resistance is within spec, reinstall and re-test.
  8. If wiring and relay are good but no control signal from BCM, check BCM driver output with oscilloscope or multimeter and verify ground references. If BCM output is missing or stuck, consider BCM software update or replacement per manufacturer guidance.
  9. After repairs, clear codes, operate vehicle through relevant cycles, and verify code does not return and battery saver function operates normally.

Likely causes

  • Broken or pinched conductor in harness to relay coil
  • Corroded relay socket terminals or water ingress
  • Battery saver relay coil internally open
  • Blown in-line fuse supplying relay coil
  • Connector not fully seated after service

Fault status

⚠️ Status
Battery saver relay coil circuit open — circuit continuity or control drive to relay coil not detected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1310 B1313 B1315 B1316
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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Code

B1314

MITSUBISHI B — Body

Timeout error (TN panel close)

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

Causes

  • Open or damaged wiring between BCM/body control module and battery saver relay coil
  • Corroded, loose or disconnected relay connector or terminals
  • Faulty battery saver relay (open coil)
  • Blown fuse or fusible link protecting the relay coil circuit
  • Faulty BCM/body control module driver (open control transistor)
  • Poor ground at relay coil or related grounds

Symptoms

  • Battery saver feature does not engage (accessories remain powered)
  • Parasitic battery drain or premature battery discharge
  • Accessories not switching off automatically with ignition off
  • Possible interior lighting or convenience features staying on
  • Possible related warning messages or stored body module errors

What to check

  • Read stored codes and freeze frame with scan tool; confirm B1314 is current or historic
  • Perform visual inspection of relay, harness, connector and related fuses for damage or corrosion
  • Verify vehicle battery voltage is healthy (12.4–12.8V at rest)
  • Check fuse and any inline fuse link for continuity
  • With ignition in the state that should command battery saver, use scan tool to actuate battery saver relay (if available) and listen/observe for relay click
  • Probe relay coil terminals for voltage while commanding relay from scan tool or turning ignition to the state that should energize coil

Signal parameters

  • Relay coil voltage when commanded: approximately battery voltage (11–14.5 V) at coil supply terminal
  • Relay coil voltage when not commanded: ~0 V at control/driver terminal (may see pull-down or low voltage)
  • Relay coil resistance (typical): 50–200 ohms (manufacturer-specific; compare to known-good relay)
  • Continuity: supply fuse to relay coil terminal should show near 0 ohms (
  • Ground continuity: relay coil ground to battery negative: near 0 ohms (

Diagnostic algorithm

  1. Safety first: ensure vehicle is parked, ignition off, and battery stable; use PPE and follow manufacturer procedures.
  2. Retrieve freeze frame and confirm B1314 is present; clear code and attempt to re-create to verify active condition.
  3. Visually inspect relay, socket, harness, and all visible wiring for damage, corrosion, loose pins or water ingress. Repair as needed.
  4. Check relevant fuses and fusible links for continuity; replace any blown fuses.
  5. With relay in place, backprobe relay coil supply and coil control pins. Command the battery saver function from a scan tool or switch to the state that should energize the relay and observe coil supply and control voltages. Expect battery voltage on supply and battery or near 0 V on control depending on driver type.
  6. If no coil supply, trace and repair open circuit from fuse/power source to relay. If coil supply present but no control drive, test continuity between BCM control pin and relay connector; inspect connector and wiring for opens.
  7. Remove relay and measure coil resistance on bench. If coil is open (infinite resistance), replace relay. If resistance is within spec, reinstall and re-test.
  8. If wiring and relay are good but no control signal from BCM, check BCM driver output with oscilloscope or multimeter and verify ground references. If BCM output is missing or stuck, consider BCM software update or replacement per manufacturer guidance.
  9. After repairs, clear codes, operate vehicle through relevant cycles, and verify code does not return and battery saver function operates normally.

Likely causes

  • Broken or pinched conductor in harness to relay coil
  • Corroded relay socket terminals or water ingress
  • Battery saver relay coil internally open
  • Blown in-line fuse supplying relay coil
  • Connector not fully seated after service

Fault status

⚠️ Status
Battery saver relay coil circuit open — circuit continuity or control drive to relay coil not detected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1310 B1313 B1315 B1316
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MITSUBISHI

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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Code

B1314

Other B — Body

Battery Saver Relay Coil Circuit Open

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

Causes

  • Open or damaged wiring between BCM/body control module and battery saver relay coil
  • Corroded, loose or disconnected relay connector or terminals
  • Faulty battery saver relay (open coil)
  • Blown fuse or fusible link protecting the relay coil circuit
  • Faulty BCM/body control module driver (open control transistor)
  • Poor ground at relay coil or related grounds

Symptoms

  • Battery saver feature does not engage (accessories remain powered)
  • Parasitic battery drain or premature battery discharge
  • Accessories not switching off automatically with ignition off
  • Possible interior lighting or convenience features staying on
  • Possible related warning messages or stored body module errors

What to check

  • Read stored codes and freeze frame with scan tool; confirm B1314 is current or historic
  • Perform visual inspection of relay, harness, connector and related fuses for damage or corrosion
  • Verify vehicle battery voltage is healthy (12.4–12.8V at rest)
  • Check fuse and any inline fuse link for continuity
  • With ignition in the state that should command battery saver, use scan tool to actuate battery saver relay (if available) and listen/observe for relay click
  • Probe relay coil terminals for voltage while commanding relay from scan tool or turning ignition to the state that should energize coil

Signal parameters

  • Relay coil voltage when commanded: approximately battery voltage (11–14.5 V) at coil supply terminal
  • Relay coil voltage when not commanded: ~0 V at control/driver terminal (may see pull-down or low voltage)
  • Relay coil resistance (typical): 50–200 ohms (manufacturer-specific; compare to known-good relay)
  • Continuity: supply fuse to relay coil terminal should show near 0 ohms (
  • Ground continuity: relay coil ground to battery negative: near 0 ohms (

Diagnostic algorithm

  1. Safety first: ensure vehicle is parked, ignition off, and battery stable; use PPE and follow manufacturer procedures.
  2. Retrieve freeze frame and confirm B1314 is present; clear code and attempt to re-create to verify active condition.
  3. Visually inspect relay, socket, harness, and all visible wiring for damage, corrosion, loose pins or water ingress. Repair as needed.
  4. Check relevant fuses and fusible links for continuity; replace any blown fuses.
  5. With relay in place, backprobe relay coil supply and coil control pins. Command the battery saver function from a scan tool or switch to the state that should energize the relay and observe coil supply and control voltages. Expect battery voltage on supply and battery or near 0 V on control depending on driver type.
  6. If no coil supply, trace and repair open circuit from fuse/power source to relay. If coil supply present but no control drive, test continuity between BCM control pin and relay connector; inspect connector and wiring for opens.
  7. Remove relay and measure coil resistance on bench. If coil is open (infinite resistance), replace relay. If resistance is within spec, reinstall and re-test.
  8. If wiring and relay are good but no control signal from BCM, check BCM driver output with oscilloscope or multimeter and verify ground references. If BCM output is missing or stuck, consider BCM software update or replacement per manufacturer guidance.
  9. After repairs, clear codes, operate vehicle through relevant cycles, and verify code does not return and battery saver function operates normally.

Likely causes

  • Broken or pinched conductor in harness to relay coil
  • Corroded relay socket terminals or water ingress
  • Battery saver relay coil internally open
  • Blown in-line fuse supplying relay coil
  • Connector not fully seated after service

Fault status

⚠️ Status
Battery saver relay coil circuit open — circuit continuity or control drive to relay coil not detected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1310 B1313 B1315 B1316
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