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Home / DTC / B1521 — Bonnet switch circuit short to positive

B1521 — Bonnet switch circuit short to positive

Detailed page for trouble code B1521.

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B1521

ALFA ROMEO B — Body

Bonnet switch circuit short to positive

Brand: ALFA ROMEO
Type: B — Body
Views: UK: 6 EN: 6 RU: 8
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Shorted wiring to battery positive (chafe, pinched harness, damaged insulation)
  • Corroded or bridged terminals in connector (water ingress)
  • Faulty bonnet switch with internal short
  • Poor or loose connector pin making intermittent contact to B+
  • Aftermarket accessories or recent repairs that spliced into the circuit incorrectly
  • Faulty body control module / wiring inside module (less common)

Symptoms

  • Bonnet/hood-open indicator lamp or dash message
  • Interior lights or courtesy lamps staying on
  • Alarm / central locking behaviour incorrect (won't arm or false alarm)
  • Battery drain if circuit remains powered
  • DTC stored and related bonnet input functions disabled or flagged

What to check

  • Retrieve stored freeze-frame and live data with a scan tool and confirm bonnet switch status
  • Visually inspect bonnet switch and harness for damage, chafing, or corrosion
  • Check connectors for water, dirt or bent pins; ensure secure mating
  • Measure circuit voltage at the bonnet switch harness with ignition on and bonnet open/closed
  • Perform resistance and continuity checks between switch terminal and battery positive and ground
  • Disconnect bonnet switch and re-scan to see if code clears or signal changes

Signal parameters

  • Expected voltages vary by design; typical values: ~0–0.5 V when pulled to ground, ~9–14 V when pulled to battery positive
  • When bonnet opens/closes the input should toggle between low and high (refer to vehicle wiring diagram for normal state)
  • Measured voltage stuck at battery voltage (~12 V) on the harness with switch disconnected indicates short to positive
  • Resistance to battery positive should show near continuity if shorted; high resistance or open if circuit is intact

Diagnostic algorithm

  1. Read DTCs and live data. Note bonnet switch state and any related codes (battery, body control).
  2. Visually inspect bonnet switch, mounting, and harness routing for obvious damage where it passes hinges or latches.
  3. With ignition ON, back-probe the bonnet switch connector and verify voltage with bonnet open and closed. Compare to expected values from wiring diagram.
  4. Disconnect the bonnet switch connector. With connector disconnected, measure voltage on the harness pin to chassis ground. If ~12 V is present, suspect a short to positive upstream (wiring or module).
  5. Measure resistance between the harness pin and battery positive (with battery disconnected for safety). Low resistance indicates a short to B+; open or high resistance means switch or connector fault.
  6. Wiggle test the harness while watching live data/voltage for intermittent shorts. Inspect areas that flex (hinges) and repair any chafed wiring.
  7. If harness and connectors appear OK, bench-test or replace the bonnet switch and retest.
  8. If fault remains with switch and wiring verified, inspect/measure at the body control module connector for short; consult wiring diagram to isolate between switch and module.
  9. After repairs, clear codes, verify correct operation of bonnet input in live data, and perform road/test cycle to ensure the issue is resolved.
  10. Safety note: isolate battery when performing open-circuit repairs or soldering and secure connectors properly after testing.

Likely causes

  • Wiring short to B+ on bonnet switch harness (most common)
  • Damaged or corroded connector at switch or module
  • Failed bonnet switch
  • Incorrect splice or aftermarket modification
  • Module input fault (least likely)

Fault status

⚠️ Status
Bonnet switch circuit short to positive detected. High voltage present on bonnet/hood switch input — check switch, wiring and connectors for short to battery positive.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1520 B1522 B1523 B1524
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Code

B1521

FIAT B — Body

Bonnet switch circuit short to positive

Brand: FIAT
Type: B — Body
Views: UK: 6 EN: 6 RU: 7
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Shorted wiring to battery positive (chafe, pinched harness, damaged insulation)
  • Corroded or bridged terminals in connector (water ingress)
  • Faulty bonnet switch with internal short
  • Poor or loose connector pin making intermittent contact to B+
  • Aftermarket accessories or recent repairs that spliced into the circuit incorrectly
  • Faulty body control module / wiring inside module (less common)

Symptoms

  • Bonnet/hood-open indicator lamp or dash message
  • Interior lights or courtesy lamps staying on
  • Alarm / central locking behaviour incorrect (won't arm or false alarm)
  • Battery drain if circuit remains powered
  • DTC stored and related bonnet input functions disabled or flagged

What to check

  • Retrieve stored freeze-frame and live data with a scan tool and confirm bonnet switch status
  • Visually inspect bonnet switch and harness for damage, chafing, or corrosion
  • Check connectors for water, dirt or bent pins; ensure secure mating
  • Measure circuit voltage at the bonnet switch harness with ignition on and bonnet open/closed
  • Perform resistance and continuity checks between switch terminal and battery positive and ground
  • Disconnect bonnet switch and re-scan to see if code clears or signal changes

Signal parameters

  • Expected voltages vary by design; typical values: ~0–0.5 V when pulled to ground, ~9–14 V when pulled to battery positive
  • When bonnet opens/closes the input should toggle between low and high (refer to vehicle wiring diagram for normal state)
  • Measured voltage stuck at battery voltage (~12 V) on the harness with switch disconnected indicates short to positive
  • Resistance to battery positive should show near continuity if shorted; high resistance or open if circuit is intact

Diagnostic algorithm

  1. Read DTCs and live data. Note bonnet switch state and any related codes (battery, body control).
  2. Visually inspect bonnet switch, mounting, and harness routing for obvious damage where it passes hinges or latches.
  3. With ignition ON, back-probe the bonnet switch connector and verify voltage with bonnet open and closed. Compare to expected values from wiring diagram.
  4. Disconnect the bonnet switch connector. With connector disconnected, measure voltage on the harness pin to chassis ground. If ~12 V is present, suspect a short to positive upstream (wiring or module).
  5. Measure resistance between the harness pin and battery positive (with battery disconnected for safety). Low resistance indicates a short to B+; open or high resistance means switch or connector fault.
  6. Wiggle test the harness while watching live data/voltage for intermittent shorts. Inspect areas that flex (hinges) and repair any chafed wiring.
  7. If harness and connectors appear OK, bench-test or replace the bonnet switch and retest.
  8. If fault remains with switch and wiring verified, inspect/measure at the body control module connector for short; consult wiring diagram to isolate between switch and module.
  9. After repairs, clear codes, verify correct operation of bonnet input in live data, and perform road/test cycle to ensure the issue is resolved.
  10. Safety note: isolate battery when performing open-circuit repairs or soldering and secure connectors properly after testing.

Likely causes

  • Wiring short to B+ on bonnet switch harness (most common)
  • Damaged or corroded connector at switch or module
  • Failed bonnet switch
  • Incorrect splice or aftermarket modification
  • Module input fault (least likely)

Fault status

⚠️ Status
Bonnet switch circuit short to positive detected. High voltage present on bonnet/hood switch input — check switch, wiring and connectors for short to battery positive.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1520 B1522 B1523 B1524
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Code

B1521

MITSUBISHI B — Body

DR.buckle SW open for N.C

Brand: MITSUBISHI
Type: B — Body
Views: UK: 10 EN: 12 RU: 14
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Shorted wiring to battery positive (chafe, pinched harness, damaged insulation)
  • Corroded or bridged terminals in connector (water ingress)
  • Faulty bonnet switch with internal short
  • Poor or loose connector pin making intermittent contact to B+
  • Aftermarket accessories or recent repairs that spliced into the circuit incorrectly
  • Faulty body control module / wiring inside module (less common)

Symptoms

  • Bonnet/hood-open indicator lamp or dash message
  • Interior lights or courtesy lamps staying on
  • Alarm / central locking behaviour incorrect (won't arm or false alarm)
  • Battery drain if circuit remains powered
  • DTC stored and related bonnet input functions disabled or flagged

What to check

  • Retrieve stored freeze-frame and live data with a scan tool and confirm bonnet switch status
  • Visually inspect bonnet switch and harness for damage, chafing, or corrosion
  • Check connectors for water, dirt or bent pins; ensure secure mating
  • Measure circuit voltage at the bonnet switch harness with ignition on and bonnet open/closed
  • Perform resistance and continuity checks between switch terminal and battery positive and ground
  • Disconnect bonnet switch and re-scan to see if code clears or signal changes

Signal parameters

  • Expected voltages vary by design; typical values: ~0–0.5 V when pulled to ground, ~9–14 V when pulled to battery positive
  • When bonnet opens/closes the input should toggle between low and high (refer to vehicle wiring diagram for normal state)
  • Measured voltage stuck at battery voltage (~12 V) on the harness with switch disconnected indicates short to positive
  • Resistance to battery positive should show near continuity if shorted; high resistance or open if circuit is intact

Diagnostic algorithm

  1. Read DTCs and live data. Note bonnet switch state and any related codes (battery, body control).
  2. Visually inspect bonnet switch, mounting, and harness routing for obvious damage where it passes hinges or latches.
  3. With ignition ON, back-probe the bonnet switch connector and verify voltage with bonnet open and closed. Compare to expected values from wiring diagram.
  4. Disconnect the bonnet switch connector. With connector disconnected, measure voltage on the harness pin to chassis ground. If ~12 V is present, suspect a short to positive upstream (wiring or module).
  5. Measure resistance between the harness pin and battery positive (with battery disconnected for safety). Low resistance indicates a short to B+; open or high resistance means switch or connector fault.
  6. Wiggle test the harness while watching live data/voltage for intermittent shorts. Inspect areas that flex (hinges) and repair any chafed wiring.
  7. If harness and connectors appear OK, bench-test or replace the bonnet switch and retest.
  8. If fault remains with switch and wiring verified, inspect/measure at the body control module connector for short; consult wiring diagram to isolate between switch and module.
  9. After repairs, clear codes, verify correct operation of bonnet input in live data, and perform road/test cycle to ensure the issue is resolved.
  10. Safety note: isolate battery when performing open-circuit repairs or soldering and secure connectors properly after testing.

Likely causes

  • Wiring short to B+ on bonnet switch harness (most common)
  • Damaged or corroded connector at switch or module
  • Failed bonnet switch
  • Incorrect splice or aftermarket modification
  • Module input fault (least likely)

Fault status

⚠️ Status
Bonnet switch circuit short to positive detected. High voltage present on bonnet/hood switch input — check switch, wiring and connectors for short to battery positive.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1520 B1522 B1523 B1524
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

B1521

Other B — Body

Hood Switch Circuit Short To Battery

Brand: Other
Type: B — Body
Views: UK: 25 EN: 30 RU: 26
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Shorted wiring to battery positive (chafe, pinched harness, damaged insulation)
  • Corroded or bridged terminals in connector (water ingress)
  • Faulty bonnet switch with internal short
  • Poor or loose connector pin making intermittent contact to B+
  • Aftermarket accessories or recent repairs that spliced into the circuit incorrectly
  • Faulty body control module / wiring inside module (less common)

Symptoms

  • Bonnet/hood-open indicator lamp or dash message
  • Interior lights or courtesy lamps staying on
  • Alarm / central locking behaviour incorrect (won't arm or false alarm)
  • Battery drain if circuit remains powered
  • DTC stored and related bonnet input functions disabled or flagged

What to check

  • Retrieve stored freeze-frame and live data with a scan tool and confirm bonnet switch status
  • Visually inspect bonnet switch and harness for damage, chafing, or corrosion
  • Check connectors for water, dirt or bent pins; ensure secure mating
  • Measure circuit voltage at the bonnet switch harness with ignition on and bonnet open/closed
  • Perform resistance and continuity checks between switch terminal and battery positive and ground
  • Disconnect bonnet switch and re-scan to see if code clears or signal changes

Signal parameters

  • Expected voltages vary by design; typical values: ~0–0.5 V when pulled to ground, ~9–14 V when pulled to battery positive
  • When bonnet opens/closes the input should toggle between low and high (refer to vehicle wiring diagram for normal state)
  • Measured voltage stuck at battery voltage (~12 V) on the harness with switch disconnected indicates short to positive
  • Resistance to battery positive should show near continuity if shorted; high resistance or open if circuit is intact

Diagnostic algorithm

  1. Read DTCs and live data. Note bonnet switch state and any related codes (battery, body control).
  2. Visually inspect bonnet switch, mounting, and harness routing for obvious damage where it passes hinges or latches.
  3. With ignition ON, back-probe the bonnet switch connector and verify voltage with bonnet open and closed. Compare to expected values from wiring diagram.
  4. Disconnect the bonnet switch connector. With connector disconnected, measure voltage on the harness pin to chassis ground. If ~12 V is present, suspect a short to positive upstream (wiring or module).
  5. Measure resistance between the harness pin and battery positive (with battery disconnected for safety). Low resistance indicates a short to B+; open or high resistance means switch or connector fault.
  6. Wiggle test the harness while watching live data/voltage for intermittent shorts. Inspect areas that flex (hinges) and repair any chafed wiring.
  7. If harness and connectors appear OK, bench-test or replace the bonnet switch and retest.
  8. If fault remains with switch and wiring verified, inspect/measure at the body control module connector for short; consult wiring diagram to isolate between switch and module.
  9. After repairs, clear codes, verify correct operation of bonnet input in live data, and perform road/test cycle to ensure the issue is resolved.
  10. Safety note: isolate battery when performing open-circuit repairs or soldering and secure connectors properly after testing.

Likely causes

  • Wiring short to B+ on bonnet switch harness (most common)
  • Damaged or corroded connector at switch or module
  • Failed bonnet switch
  • Incorrect splice or aftermarket modification
  • Module input fault (least likely)

Fault status

⚠️ Status
Bonnet switch circuit short to positive detected. High voltage present on bonnet/hood switch input — check switch, wiring and connectors for short to battery positive.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1520 B1522 B1523 B1524
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Manual in English Pages: 494 7.1 MB
Short description

Land Rover Range Rover Electrical Library (LRL 0453ENG). Comprehensive manual covering fuse details, earth points, system descriptions, diagnostics and connector pin-outs for electrical troubleshooting and repair. Intended for technicians and service workshops.

Contents
Key sections:
  • 1 INTRODUCTION
  • 1.1 About this document
  • 1.2 Battery voltage
  • 1.3 Electrical precautions
  • 1.4 Battery disconnecting / charging
  • 1.5 Disciplines / greases
  • 1.6 Abbreviations
  • 1.7 HeVAC, sensors abbreviations
  • 1.8 How to use this document
  • 1.9 Connector detail format
  • 1.10 Fault diagnosis
  • 1.11 Wire colour codes
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