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Home / DTC / B1913 — Heated Seat Switch - Mode Input Shorted to Battery

B1913 — Heated Seat Switch - Mode Input Shorted to Battery

Detailed page for trouble code B1913.

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Code

B1913

HUMMER B — Body

Heated Seat Switch - Mode Input Shorted to Battery

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

Causes

  • Damaged or pinched wiring between switch and seat module causing insulation failure to battery feed
  • Corroded, pushed-back or bridged connector terminals allowing B+ to contact the mode circuit
  • Internal failure inside the heated-seat switch (stuck contact or shorted internal traces)
  • Incorrect or damaged aftermarket wiring (seat covers, audio, alarms) tapping into constant 12V
  • Faulty seat heater control module or internal short in the module
  • Improper repair or previous splice with exposed conductor

Symptoms

  • Heated seat mode cannot be changed or is locked in a single mode
  • Seat heater stays on or runs at full heat regardless of switch position
  • DTC B1913 stored and/or warning/message on instrument cluster
  • Intermittent operation or operation only when wiring is moved (suggests wiring fault)

What to check

  • Scan for active and pending codes and freeze frame data; record before clearing
  • Perform a visual inspection of the seat, under-seat area, connectors and wiring for damage, pinching, or aftermarket taps
  • Check related fuses and any inline connectors for heat damage or corrosion
  • Backprobe switch connector and seat module connector to measure voltage at key pins with ignition ON
  • Wiggle test wiring while monitoring connector voltages to look for intermittent shorts
  • Disconnect the heated-seat switch and see if the code clears or if the mode input voltage changes

Signal parameters

  • Expected: Mode input should NOT be at steady battery voltage when switch is idle; it should be pull-to-low or a controlled logic signal depending on system design
  • With ignition ON and switch in neutral/off: measured voltage typically near 0–1 V (or toggling according to design)
  • With a short to battery: measured steady ~12 V (battery voltage) on the mode input pin
  • If equipped with a low-voltage logic input, expected high-level is system reference (e.g., 5 V) — steady battery (12 V) indicates over-voltage/short

Diagnostic algorithm

  1. Verify the symptom and confirm B1913 is stored; note time and any freeze-frame data.
  2. Visually inspect switch, harness, and connectors at the seat for damage, melted insulation, or aftermarket splices.
  3. With ignition ON, backprobe the heated-seat switch mode pin and measure voltage. A steady ~12 V indicates a short to battery.
  4. Disconnect the switch and re-measure at the harness side. If 12 V is still present, the short is downstream (toward module or accessory). If voltage disappears, suspect the switch.
  5. Disconnect the seat heater control module (if separate) and check the mode circuit at the module connector. Isolate whether short is between switch and module or inside module.
  6. Perform a continuity check between the mode pin and any nearby constant B+ circuits to identify direct shorts. Inspect for chafe points under the seat and near seat tracks.
  7. If intermittent, perform a wiggle test while monitoring voltage and/or use a test light to locate the short path.
  8. Repair identified wiring faults (replace damaged section, repair connector terminals, remove aftermarket taps) or replace the faulty switch/module as required.
  9. After repair, clear codes, retest system through all seat heating modes, and verify no reoccurrence of the fault.

Likely causes

  • Switch internal short or failed switch
  • Chafed wire contacting a constant 12V source under the seat
  • Connector damage/corrosion at switch or seat module
  • Aftermarket accessory tied into constant battery power at or near the seat
  • Seat module fault (less common than harness/switch faults)

Fault status

⚠️ Status
Heated Seat Switch - Mode Input Shorted to Battery (B1913): mode input detected at battery voltage. Seat heating mode selection may be locked or behave improperly.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1910 B1911 B1912 B1914 B1920
Repair manuals

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Code

B1913

LAND ROVER B — Body

airbag circuit short-circuited

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

Causes

  • Damaged or pinched wiring between switch and seat module causing insulation failure to battery feed
  • Corroded, pushed-back or bridged connector terminals allowing B+ to contact the mode circuit
  • Internal failure inside the heated-seat switch (stuck contact or shorted internal traces)
  • Incorrect or damaged aftermarket wiring (seat covers, audio, alarms) tapping into constant 12V
  • Faulty seat heater control module or internal short in the module
  • Improper repair or previous splice with exposed conductor

Symptoms

  • Heated seat mode cannot be changed or is locked in a single mode
  • Seat heater stays on or runs at full heat regardless of switch position
  • DTC B1913 stored and/or warning/message on instrument cluster
  • Intermittent operation or operation only when wiring is moved (suggests wiring fault)

What to check

  • Scan for active and pending codes and freeze frame data; record before clearing
  • Perform a visual inspection of the seat, under-seat area, connectors and wiring for damage, pinching, or aftermarket taps
  • Check related fuses and any inline connectors for heat damage or corrosion
  • Backprobe switch connector and seat module connector to measure voltage at key pins with ignition ON
  • Wiggle test wiring while monitoring connector voltages to look for intermittent shorts
  • Disconnect the heated-seat switch and see if the code clears or if the mode input voltage changes

Signal parameters

  • Expected: Mode input should NOT be at steady battery voltage when switch is idle; it should be pull-to-low or a controlled logic signal depending on system design
  • With ignition ON and switch in neutral/off: measured voltage typically near 0–1 V (or toggling according to design)
  • With a short to battery: measured steady ~12 V (battery voltage) on the mode input pin
  • If equipped with a low-voltage logic input, expected high-level is system reference (e.g., 5 V) — steady battery (12 V) indicates over-voltage/short

Diagnostic algorithm

  1. Verify the symptom and confirm B1913 is stored; note time and any freeze-frame data.
  2. Visually inspect switch, harness, and connectors at the seat for damage, melted insulation, or aftermarket splices.
  3. With ignition ON, backprobe the heated-seat switch mode pin and measure voltage. A steady ~12 V indicates a short to battery.
  4. Disconnect the switch and re-measure at the harness side. If 12 V is still present, the short is downstream (toward module or accessory). If voltage disappears, suspect the switch.
  5. Disconnect the seat heater control module (if separate) and check the mode circuit at the module connector. Isolate whether short is between switch and module or inside module.
  6. Perform a continuity check between the mode pin and any nearby constant B+ circuits to identify direct shorts. Inspect for chafe points under the seat and near seat tracks.
  7. If intermittent, perform a wiggle test while monitoring voltage and/or use a test light to locate the short path.
  8. Repair identified wiring faults (replace damaged section, repair connector terminals, remove aftermarket taps) or replace the faulty switch/module as required.
  9. After repair, clear codes, retest system through all seat heating modes, and verify no reoccurrence of the fault.

Likely causes

  • Switch internal short or failed switch
  • Chafed wire contacting a constant 12V source under the seat
  • Connector damage/corrosion at switch or seat module
  • Aftermarket accessory tied into constant battery power at or near the seat
  • Seat module fault (less common than harness/switch faults)

Fault status

⚠️ Status
Heated Seat Switch - Mode Input Shorted to Battery (B1913): mode input detected at battery voltage. Seat heating mode selection may be locked or behave improperly.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1910 B1911 B1912 B1914 B1920
413

Browse 413 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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Code

B1913

Other B — Body

Air Bag Driver/Passenger Circuit Short To Ground

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

Causes

  • Damaged or pinched wiring between switch and seat module causing insulation failure to battery feed
  • Corroded, pushed-back or bridged connector terminals allowing B+ to contact the mode circuit
  • Internal failure inside the heated-seat switch (stuck contact or shorted internal traces)
  • Incorrect or damaged aftermarket wiring (seat covers, audio, alarms) tapping into constant 12V
  • Faulty seat heater control module or internal short in the module
  • Improper repair or previous splice with exposed conductor

Symptoms

  • Heated seat mode cannot be changed or is locked in a single mode
  • Seat heater stays on or runs at full heat regardless of switch position
  • DTC B1913 stored and/or warning/message on instrument cluster
  • Intermittent operation or operation only when wiring is moved (suggests wiring fault)

What to check

  • Scan for active and pending codes and freeze frame data; record before clearing
  • Perform a visual inspection of the seat, under-seat area, connectors and wiring for damage, pinching, or aftermarket taps
  • Check related fuses and any inline connectors for heat damage or corrosion
  • Backprobe switch connector and seat module connector to measure voltage at key pins with ignition ON
  • Wiggle test wiring while monitoring connector voltages to look for intermittent shorts
  • Disconnect the heated-seat switch and see if the code clears or if the mode input voltage changes

Signal parameters

  • Expected: Mode input should NOT be at steady battery voltage when switch is idle; it should be pull-to-low or a controlled logic signal depending on system design
  • With ignition ON and switch in neutral/off: measured voltage typically near 0–1 V (or toggling according to design)
  • With a short to battery: measured steady ~12 V (battery voltage) on the mode input pin
  • If equipped with a low-voltage logic input, expected high-level is system reference (e.g., 5 V) — steady battery (12 V) indicates over-voltage/short

Diagnostic algorithm

  1. Verify the symptom and confirm B1913 is stored; note time and any freeze-frame data.
  2. Visually inspect switch, harness, and connectors at the seat for damage, melted insulation, or aftermarket splices.
  3. With ignition ON, backprobe the heated-seat switch mode pin and measure voltage. A steady ~12 V indicates a short to battery.
  4. Disconnect the switch and re-measure at the harness side. If 12 V is still present, the short is downstream (toward module or accessory). If voltage disappears, suspect the switch.
  5. Disconnect the seat heater control module (if separate) and check the mode circuit at the module connector. Isolate whether short is between switch and module or inside module.
  6. Perform a continuity check between the mode pin and any nearby constant B+ circuits to identify direct shorts. Inspect for chafe points under the seat and near seat tracks.
  7. If intermittent, perform a wiggle test while monitoring voltage and/or use a test light to locate the short path.
  8. Repair identified wiring faults (replace damaged section, repair connector terminals, remove aftermarket taps) or replace the faulty switch/module as required.
  9. After repair, clear codes, retest system through all seat heating modes, and verify no reoccurrence of the fault.

Likely causes

  • Switch internal short or failed switch
  • Chafed wire contacting a constant 12V source under the seat
  • Connector damage/corrosion at switch or seat module
  • Aftermarket accessory tied into constant battery power at or near the seat
  • Seat module fault (less common than harness/switch faults)

Fault status

⚠️ Status
Heated Seat Switch - Mode Input Shorted to Battery (B1913): mode input detected at battery voltage. Seat heating mode selection may be locked or behave improperly.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1910 B1911 B1912 B1914 B1920
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