Code
B1313
ALFA ROMEO
B — Body
Battery saver relay command circuit
Views:
UK: 4
EN: 1
RU: 3
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring between BCM and battery saver relay
- Corroded or loose connector at relay or BCM
- Failed battery saver relay (coil or contacts)
- Faulty BCM output driver or software fault
- Blown fuse or poor power/ground supply to relay circuit
- Aftermarket accessories or modifications causing interference
Symptoms
- Battery saver feature does not engage or disengage
- Interior/roof/console lights remain on or do not turn off
- Battery drain or a discharged battery after vehicle sit
- Warning lamps or body-electronics faults logged
- Intermittent operation of accessories controlled by the battery saver relay
What to check
- Read stored fault codes and freeze-frame data with a diagnostic scanner
- Visual inspection of relay, connector, harness routing and grounds for corrosion, damage or pinched wires
- Check relevant fuses and fusible links for continuity
- Confirm battery voltage is within normal range (12–14.5 V)
- Backprobe relay connector and BCM output while commanding battery saver to observe switching behavior
- Measure continuity between relay connector and BCM pin with connector disconnected
Signal parameters
- Command signal expected to switch between battery voltage (~12–14 V) and ~0 V when the BCM actuates the relay (some systems use a low-side drive or a switched positive — verify on vehicle)
- Relay coil resistance typically in the tens to low hundreds of ohms (depends on the relay) — coil current draw is usually tens to a few hundred milliamps
- No-load voltage at relay supply should be battery voltage (~12 V) with ignition off/standby
Diagnostic algorithm
- Retrieve and record DTCs and vehicle information. Verify conditions when the code set (freeze frame).
- Perform a visual inspection of the relay, socket, harness, and adjacent connectors. Repair any obvious corrosion/damage.
- Check related fuses and power/ground feeds for the relay circuit. Replace blown fuses and verify supply voltage to the relay socket.
- With ignition off, measure coil resistance across relay coil terminals (compare to generic relay spec). If coil open or shorted, replace relay.
- Backprobe the relay command terminal. Command the battery saver function using the diagnostic tool and observe the command signal: it should change state (0 V ↔ battery voltage).
- If no command signal, trace continuity from BCM output pin to relay connector. Repair open/short as needed.
- If wiring and relay good but no valid command or incorrect levels, test or substitute BCM output driver where allowed by manufacturer procedures or consult dealer-level documentation. Avoid replacing the module without proper verification.
- After repairs, clear codes and perform functional test and verify no recurrence. Monitor for parasitic draw if battery saver still not operating.
Likely causes
- Corroded/loose connector at the relay or inline connector
- Open/short in the command wire (damage, chafing, pinched wire)
- Failed relay coil or contacts
- Faulty BCM output transistor or circuit
Fault status
Status
Battery saver relay command circuit fault — potential open, short, or intermittent connection between BCM and battery saver relay. Verify wiring, connector, relay and BCM output before replacement.
Repair difficulty: Medium
Diagnostic time: 0.5–2 hours
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Code
B1313
FIAT
B — Body
Battery saver relay command circuit
Views:
UK: 4
EN: 3
RU: 1
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring between BCM and battery saver relay
- Corroded or loose connector at relay or BCM
- Failed battery saver relay (coil or contacts)
- Faulty BCM output driver or software fault
- Blown fuse or poor power/ground supply to relay circuit
- Aftermarket accessories or modifications causing interference
Symptoms
- Battery saver feature does not engage or disengage
- Interior/roof/console lights remain on or do not turn off
- Battery drain or a discharged battery after vehicle sit
- Warning lamps or body-electronics faults logged
- Intermittent operation of accessories controlled by the battery saver relay
What to check
- Read stored fault codes and freeze-frame data with a diagnostic scanner
- Visual inspection of relay, connector, harness routing and grounds for corrosion, damage or pinched wires
- Check relevant fuses and fusible links for continuity
- Confirm battery voltage is within normal range (12–14.5 V)
- Backprobe relay connector and BCM output while commanding battery saver to observe switching behavior
- Measure continuity between relay connector and BCM pin with connector disconnected
Signal parameters
- Command signal expected to switch between battery voltage (~12–14 V) and ~0 V when the BCM actuates the relay (some systems use a low-side drive or a switched positive — verify on vehicle)
- Relay coil resistance typically in the tens to low hundreds of ohms (depends on the relay) — coil current draw is usually tens to a few hundred milliamps
- No-load voltage at relay supply should be battery voltage (~12 V) with ignition off/standby
Diagnostic algorithm
- Retrieve and record DTCs and vehicle information. Verify conditions when the code set (freeze frame).
- Perform a visual inspection of the relay, socket, harness, and adjacent connectors. Repair any obvious corrosion/damage.
- Check related fuses and power/ground feeds for the relay circuit. Replace blown fuses and verify supply voltage to the relay socket.
- With ignition off, measure coil resistance across relay coil terminals (compare to generic relay spec). If coil open or shorted, replace relay.
- Backprobe the relay command terminal. Command the battery saver function using the diagnostic tool and observe the command signal: it should change state (0 V ↔ battery voltage).
- If no command signal, trace continuity from BCM output pin to relay connector. Repair open/short as needed.
- If wiring and relay good but no valid command or incorrect levels, test or substitute BCM output driver where allowed by manufacturer procedures or consult dealer-level documentation. Avoid replacing the module without proper verification.
- After repairs, clear codes and perform functional test and verify no recurrence. Monitor for parasitic draw if battery saver still not operating.
Likely causes
- Corroded/loose connector at the relay or inline connector
- Open/short in the command wire (damage, chafing, pinched wire)
- Failed relay coil or contacts
- Faulty BCM output transistor or circuit
Fault status
Status
Battery saver relay command circuit fault — potential open, short, or intermittent connection between BCM and battery saver relay. Verify wiring, connector, relay and BCM output before replacement.
Repair difficulty: Medium
Diagnostic time: 0.5–2 hours
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Code
B1313
HUMMER
B — Body
High Side Temp Sensor Short Circuit
Views:
UK: 4
EN: 9
RU: 5
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring between BCM and battery saver relay
- Corroded or loose connector at relay or BCM
- Failed battery saver relay (coil or contacts)
- Faulty BCM output driver or software fault
- Blown fuse or poor power/ground supply to relay circuit
- Aftermarket accessories or modifications causing interference
Symptoms
- Battery saver feature does not engage or disengage
- Interior/roof/console lights remain on or do not turn off
- Battery drain or a discharged battery after vehicle sit
- Warning lamps or body-electronics faults logged
- Intermittent operation of accessories controlled by the battery saver relay
What to check
- Read stored fault codes and freeze-frame data with a diagnostic scanner
- Visual inspection of relay, connector, harness routing and grounds for corrosion, damage or pinched wires
- Check relevant fuses and fusible links for continuity
- Confirm battery voltage is within normal range (12–14.5 V)
- Backprobe relay connector and BCM output while commanding battery saver to observe switching behavior
- Measure continuity between relay connector and BCM pin with connector disconnected
Signal parameters
- Command signal expected to switch between battery voltage (~12–14 V) and ~0 V when the BCM actuates the relay (some systems use a low-side drive or a switched positive — verify on vehicle)
- Relay coil resistance typically in the tens to low hundreds of ohms (depends on the relay) — coil current draw is usually tens to a few hundred milliamps
- No-load voltage at relay supply should be battery voltage (~12 V) with ignition off/standby
Diagnostic algorithm
- Retrieve and record DTCs and vehicle information. Verify conditions when the code set (freeze frame).
- Perform a visual inspection of the relay, socket, harness, and adjacent connectors. Repair any obvious corrosion/damage.
- Check related fuses and power/ground feeds for the relay circuit. Replace blown fuses and verify supply voltage to the relay socket.
- With ignition off, measure coil resistance across relay coil terminals (compare to generic relay spec). If coil open or shorted, replace relay.
- Backprobe the relay command terminal. Command the battery saver function using the diagnostic tool and observe the command signal: it should change state (0 V ↔ battery voltage).
- If no command signal, trace continuity from BCM output pin to relay connector. Repair open/short as needed.
- If wiring and relay good but no valid command or incorrect levels, test or substitute BCM output driver where allowed by manufacturer procedures or consult dealer-level documentation. Avoid replacing the module without proper verification.
- After repairs, clear codes and perform functional test and verify no recurrence. Monitor for parasitic draw if battery saver still not operating.
Likely causes
- Corroded/loose connector at the relay or inline connector
- Open/short in the command wire (damage, chafing, pinched wire)
- Failed relay coil or contacts
- Faulty BCM output transistor or circuit
Fault status
Status
Battery saver relay command circuit fault — potential open, short, or intermittent connection between BCM and battery saver relay. Verify wiring, connector, relay and BCM output before replacement.
Repair difficulty: Medium
Diagnostic time: 0.5–2 hours
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Code
B1313
LAND ROVER
B — Body
Battery Saving Relay Coil - Circuit Failure
Views:
UK: 5
EN: 7
RU: 6
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring between BCM and battery saver relay
- Corroded or loose connector at relay or BCM
- Failed battery saver relay (coil or contacts)
- Faulty BCM output driver or software fault
- Blown fuse or poor power/ground supply to relay circuit
- Aftermarket accessories or modifications causing interference
Symptoms
- Battery saver feature does not engage or disengage
- Interior/roof/console lights remain on or do not turn off
- Battery drain or a discharged battery after vehicle sit
- Warning lamps or body-electronics faults logged
- Intermittent operation of accessories controlled by the battery saver relay
What to check
- Read stored fault codes and freeze-frame data with a diagnostic scanner
- Visual inspection of relay, connector, harness routing and grounds for corrosion, damage or pinched wires
- Check relevant fuses and fusible links for continuity
- Confirm battery voltage is within normal range (12–14.5 V)
- Backprobe relay connector and BCM output while commanding battery saver to observe switching behavior
- Measure continuity between relay connector and BCM pin with connector disconnected
Signal parameters
- Command signal expected to switch between battery voltage (~12–14 V) and ~0 V when the BCM actuates the relay (some systems use a low-side drive or a switched positive — verify on vehicle)
- Relay coil resistance typically in the tens to low hundreds of ohms (depends on the relay) — coil current draw is usually tens to a few hundred milliamps
- No-load voltage at relay supply should be battery voltage (~12 V) with ignition off/standby
Diagnostic algorithm
- Retrieve and record DTCs and vehicle information. Verify conditions when the code set (freeze frame).
- Perform a visual inspection of the relay, socket, harness, and adjacent connectors. Repair any obvious corrosion/damage.
- Check related fuses and power/ground feeds for the relay circuit. Replace blown fuses and verify supply voltage to the relay socket.
- With ignition off, measure coil resistance across relay coil terminals (compare to generic relay spec). If coil open or shorted, replace relay.
- Backprobe the relay command terminal. Command the battery saver function using the diagnostic tool and observe the command signal: it should change state (0 V ↔ battery voltage).
- If no command signal, trace continuity from BCM output pin to relay connector. Repair open/short as needed.
- If wiring and relay good but no valid command or incorrect levels, test or substitute BCM output driver where allowed by manufacturer procedures or consult dealer-level documentation. Avoid replacing the module without proper verification.
- After repairs, clear codes and perform functional test and verify no recurrence. Monitor for parasitic draw if battery saver still not operating.
Likely causes
- Corroded/loose connector at the relay or inline connector
- Open/short in the command wire (damage, chafing, pinched wire)
- Failed relay coil or contacts
- Faulty BCM output transistor or circuit
Fault status
Status
Battery saver relay command circuit fault — potential open, short, or intermittent connection between BCM and battery saver relay. Verify wiring, connector, relay and BCM output before replacement.
Repair difficulty: Medium
Diagnostic time: 0.5–2 hours
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Code
B1313
MITSUBISHI
B — Body
Timeout error (Topstack down)
Views:
UK: 5
EN: 12
RU: 6
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring between BCM and battery saver relay
- Corroded or loose connector at relay or BCM
- Failed battery saver relay (coil or contacts)
- Faulty BCM output driver or software fault
- Blown fuse or poor power/ground supply to relay circuit
- Aftermarket accessories or modifications causing interference
Symptoms
- Battery saver feature does not engage or disengage
- Interior/roof/console lights remain on or do not turn off
- Battery drain or a discharged battery after vehicle sit
- Warning lamps or body-electronics faults logged
- Intermittent operation of accessories controlled by the battery saver relay
What to check
- Read stored fault codes and freeze-frame data with a diagnostic scanner
- Visual inspection of relay, connector, harness routing and grounds for corrosion, damage or pinched wires
- Check relevant fuses and fusible links for continuity
- Confirm battery voltage is within normal range (12–14.5 V)
- Backprobe relay connector and BCM output while commanding battery saver to observe switching behavior
- Measure continuity between relay connector and BCM pin with connector disconnected
Signal parameters
- Command signal expected to switch between battery voltage (~12–14 V) and ~0 V when the BCM actuates the relay (some systems use a low-side drive or a switched positive — verify on vehicle)
- Relay coil resistance typically in the tens to low hundreds of ohms (depends on the relay) — coil current draw is usually tens to a few hundred milliamps
- No-load voltage at relay supply should be battery voltage (~12 V) with ignition off/standby
Diagnostic algorithm
- Retrieve and record DTCs and vehicle information. Verify conditions when the code set (freeze frame).
- Perform a visual inspection of the relay, socket, harness, and adjacent connectors. Repair any obvious corrosion/damage.
- Check related fuses and power/ground feeds for the relay circuit. Replace blown fuses and verify supply voltage to the relay socket.
- With ignition off, measure coil resistance across relay coil terminals (compare to generic relay spec). If coil open or shorted, replace relay.
- Backprobe the relay command terminal. Command the battery saver function using the diagnostic tool and observe the command signal: it should change state (0 V ↔ battery voltage).
- If no command signal, trace continuity from BCM output pin to relay connector. Repair open/short as needed.
- If wiring and relay good but no valid command or incorrect levels, test or substitute BCM output driver where allowed by manufacturer procedures or consult dealer-level documentation. Avoid replacing the module without proper verification.
- After repairs, clear codes and perform functional test and verify no recurrence. Monitor for parasitic draw if battery saver still not operating.
Likely causes
- Corroded/loose connector at the relay or inline connector
- Open/short in the command wire (damage, chafing, pinched wire)
- Failed relay coil or contacts
- Faulty BCM output transistor or circuit
Fault status
Status
Battery saver relay command circuit fault — potential open, short, or intermittent connection between BCM and battery saver relay. Verify wiring, connector, relay and BCM output before replacement.
Repair difficulty: Medium
Diagnostic time: 0.5–2 hours
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Code
B1313
Other
B — Body
Battery Saver Relay Coil Circuit Failure
Views:
UK: 16
EN: 37
RU: 25
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring between BCM and battery saver relay
- Corroded or loose connector at relay or BCM
- Failed battery saver relay (coil or contacts)
- Faulty BCM output driver or software fault
- Blown fuse or poor power/ground supply to relay circuit
- Aftermarket accessories or modifications causing interference
Symptoms
- Battery saver feature does not engage or disengage
- Interior/roof/console lights remain on or do not turn off
- Battery drain or a discharged battery after vehicle sit
- Warning lamps or body-electronics faults logged
- Intermittent operation of accessories controlled by the battery saver relay
What to check
- Read stored fault codes and freeze-frame data with a diagnostic scanner
- Visual inspection of relay, connector, harness routing and grounds for corrosion, damage or pinched wires
- Check relevant fuses and fusible links for continuity
- Confirm battery voltage is within normal range (12–14.5 V)
- Backprobe relay connector and BCM output while commanding battery saver to observe switching behavior
- Measure continuity between relay connector and BCM pin with connector disconnected
Signal parameters
- Command signal expected to switch between battery voltage (~12–14 V) and ~0 V when the BCM actuates the relay (some systems use a low-side drive or a switched positive — verify on vehicle)
- Relay coil resistance typically in the tens to low hundreds of ohms (depends on the relay) — coil current draw is usually tens to a few hundred milliamps
- No-load voltage at relay supply should be battery voltage (~12 V) with ignition off/standby
Diagnostic algorithm
- Retrieve and record DTCs and vehicle information. Verify conditions when the code set (freeze frame).
- Perform a visual inspection of the relay, socket, harness, and adjacent connectors. Repair any obvious corrosion/damage.
- Check related fuses and power/ground feeds for the relay circuit. Replace blown fuses and verify supply voltage to the relay socket.
- With ignition off, measure coil resistance across relay coil terminals (compare to generic relay spec). If coil open or shorted, replace relay.
- Backprobe the relay command terminal. Command the battery saver function using the diagnostic tool and observe the command signal: it should change state (0 V ↔ battery voltage).
- If no command signal, trace continuity from BCM output pin to relay connector. Repair open/short as needed.
- If wiring and relay good but no valid command or incorrect levels, test or substitute BCM output driver where allowed by manufacturer procedures or consult dealer-level documentation. Avoid replacing the module without proper verification.
- After repairs, clear codes and perform functional test and verify no recurrence. Monitor for parasitic draw if battery saver still not operating.
Likely causes
- Corroded/loose connector at the relay or inline connector
- Open/short in the command wire (damage, chafing, pinched wire)
- Failed relay coil or contacts
- Faulty BCM output transistor or circuit
Fault status
Status
Battery saver relay command circuit fault — potential open, short, or intermittent connection between BCM and battery saver relay. Verify wiring, connector, relay and BCM output before replacement.
Repair difficulty: Medium
Diagnostic time: 0.5–2 hours
Similar codes
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+100 karma for a short comment :)
Was this AI description helpful?
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