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Home / DTC / B1353 — Key inserted circuit

B1353 — Key inserted circuit

Detailed page for trouble code B1353.

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22,491specific
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Code

B1353

ALFA ROMEO B — Body

Key inserted circuit

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

Causes

  • Open or short in the key inserted wiring (ignition column to BCM)
  • Faulty key-inserted switch or proximity sensor in the ignition barrel/key reader
  • Poor/oxidised connector or pin contact at the switch, BCM or wiring harness
  • Blown fuse or weak battery affecting sensor power/ground
  • Faulty BCM/body control module or immobilizer/keyless module
  • Intermittent mechanical problem in ignition lock cylinder or key reader (sticking/plunger)

Symptoms

  • DTC B1353 stored in memory
  • Dash message or chime indicating key insertion/recognition fault
  • Intermittent or no crank / no start conditions
  • Immobilizer or lock warning lamp illuminated
  • Erratic behaviour of keyless entry/ignition functions
  • Start/stop or accessory functions not working as expected

What to check

  • Read and record all stored DTCs and freeze frame data with a dealer-level or generic scan tool
  • Inspect fuses and relays related to body/ignition circuits
  • Visually inspect ignition lock cylinder, key reader and steering column wiring for damage or corrosion
  • Check connectors at ignition switch/key reader and at BCM for bent pins, corrosion and secure fit
  • Check vehicle battery voltage and ground connections
  • Verify related CAN/LIN network status and errors on the scan tool

Signal parameters

  • Key inserted signal type: usually a switched input to BCM (closed = key present) or a digital status message on LIN/CAN
  • Inactive (key out) expected: open circuit or logic 0; Active (key in) expected: closed circuit or logic 1 / message bit set
  • Typical switched input when active: near battery voltage (~12 V) or pulled low to ground depending on design
  • Continuity: closed switch should show low ohms (
  • CAN/LIN: key present flag appears in body/immobilizer module message when functioning correctly

Diagnostic algorithm

  1. Record all related fault codes and freeze frame data; do not clear until initial data recorded
  2. Visually inspect ignition lock barrel, key reader and harness for mechanical damage, water ingress or corrosion
  3. Check fuses and power/ground at switch and BCM; repair any blown fuses or poor grounds
  4. With ignition off, disconnect connector at key switch/sensor and check for continuity of the switch while inserting/removing key (use multimeter)
  5. Probe the switch harness with key out and key inserted: verify expected voltage change or continuity at the connector relative to ground/battery as per wiring diagram
  6. If switch signals reach harness but not the BCM, perform continuity test from switch connector to BCM pin; repair broken wiring or crimps
  7. If wiring and switch are good, check for correct LIN/CAN messages using a scan tool; diagnose any network faults that affect key status
  8. If BCM or keyless/immobilizer module does not register a valid input despite correct wiring and sensor operation, consider module fault; check for available software updates and follow manufacturer module test/reprogramming procedure
  9. After any repair, clear codes and verify fault does not return; perform multiple insert/remove cycles and road-start checks
  10. Follow manufacturer service manual and wiring diagrams; observe safety precautions when working around the steering column and airbag system

Likely causes

  • Damaged or chafed wiring in steering column (most common)
  • Faulty key-inserted microswitch or sensor in the ignition barrel
  • Loose/poor connector at BCM or ignition switch harness
  • Blown fuse or poor ground connection

Fault status

⚠️ Status
Key Inserted Circuit — open/short or communication fault detected between key sensor and control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

B1350 B1351 B1352 B1354 B1500
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

B1353

FIAT B — Body

Key inserted circuit

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

Causes

  • Open or short in the key inserted wiring (ignition column to BCM)
  • Faulty key-inserted switch or proximity sensor in the ignition barrel/key reader
  • Poor/oxidised connector or pin contact at the switch, BCM or wiring harness
  • Blown fuse or weak battery affecting sensor power/ground
  • Faulty BCM/body control module or immobilizer/keyless module
  • Intermittent mechanical problem in ignition lock cylinder or key reader (sticking/plunger)

Symptoms

  • DTC B1353 stored in memory
  • Dash message or chime indicating key insertion/recognition fault
  • Intermittent or no crank / no start conditions
  • Immobilizer or lock warning lamp illuminated
  • Erratic behaviour of keyless entry/ignition functions
  • Start/stop or accessory functions not working as expected

What to check

  • Read and record all stored DTCs and freeze frame data with a dealer-level or generic scan tool
  • Inspect fuses and relays related to body/ignition circuits
  • Visually inspect ignition lock cylinder, key reader and steering column wiring for damage or corrosion
  • Check connectors at ignition switch/key reader and at BCM for bent pins, corrosion and secure fit
  • Check vehicle battery voltage and ground connections
  • Verify related CAN/LIN network status and errors on the scan tool

Signal parameters

  • Key inserted signal type: usually a switched input to BCM (closed = key present) or a digital status message on LIN/CAN
  • Inactive (key out) expected: open circuit or logic 0; Active (key in) expected: closed circuit or logic 1 / message bit set
  • Typical switched input when active: near battery voltage (~12 V) or pulled low to ground depending on design
  • Continuity: closed switch should show low ohms (
  • CAN/LIN: key present flag appears in body/immobilizer module message when functioning correctly

Diagnostic algorithm

  1. Record all related fault codes and freeze frame data; do not clear until initial data recorded
  2. Visually inspect ignition lock barrel, key reader and harness for mechanical damage, water ingress or corrosion
  3. Check fuses and power/ground at switch and BCM; repair any blown fuses or poor grounds
  4. With ignition off, disconnect connector at key switch/sensor and check for continuity of the switch while inserting/removing key (use multimeter)
  5. Probe the switch harness with key out and key inserted: verify expected voltage change or continuity at the connector relative to ground/battery as per wiring diagram
  6. If switch signals reach harness but not the BCM, perform continuity test from switch connector to BCM pin; repair broken wiring or crimps
  7. If wiring and switch are good, check for correct LIN/CAN messages using a scan tool; diagnose any network faults that affect key status
  8. If BCM or keyless/immobilizer module does not register a valid input despite correct wiring and sensor operation, consider module fault; check for available software updates and follow manufacturer module test/reprogramming procedure
  9. After any repair, clear codes and verify fault does not return; perform multiple insert/remove cycles and road-start checks
  10. Follow manufacturer service manual and wiring diagrams; observe safety precautions when working around the steering column and airbag system

Likely causes

  • Damaged or chafed wiring in steering column (most common)
  • Faulty key-inserted microswitch or sensor in the ignition barrel
  • Loose/poor connector at BCM or ignition switch harness
  • Blown fuse or poor ground connection

Fault status

⚠️ Status
Key Inserted Circuit — open/short or communication fault detected between key sensor and control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

B1350 B1351 B1352 B1354 B1500
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.

FIAT

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Code

B1353

LAND ROVER B — Body

Front right - face shock absorber motor

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

Causes

  • Open or short in the key inserted wiring (ignition column to BCM)
  • Faulty key-inserted switch or proximity sensor in the ignition barrel/key reader
  • Poor/oxidised connector or pin contact at the switch, BCM or wiring harness
  • Blown fuse or weak battery affecting sensor power/ground
  • Faulty BCM/body control module or immobilizer/keyless module
  • Intermittent mechanical problem in ignition lock cylinder or key reader (sticking/plunger)

Symptoms

  • DTC B1353 stored in memory
  • Dash message or chime indicating key insertion/recognition fault
  • Intermittent or no crank / no start conditions
  • Immobilizer or lock warning lamp illuminated
  • Erratic behaviour of keyless entry/ignition functions
  • Start/stop or accessory functions not working as expected

What to check

  • Read and record all stored DTCs and freeze frame data with a dealer-level or generic scan tool
  • Inspect fuses and relays related to body/ignition circuits
  • Visually inspect ignition lock cylinder, key reader and steering column wiring for damage or corrosion
  • Check connectors at ignition switch/key reader and at BCM for bent pins, corrosion and secure fit
  • Check vehicle battery voltage and ground connections
  • Verify related CAN/LIN network status and errors on the scan tool

Signal parameters

  • Key inserted signal type: usually a switched input to BCM (closed = key present) or a digital status message on LIN/CAN
  • Inactive (key out) expected: open circuit or logic 0; Active (key in) expected: closed circuit or logic 1 / message bit set
  • Typical switched input when active: near battery voltage (~12 V) or pulled low to ground depending on design
  • Continuity: closed switch should show low ohms (
  • CAN/LIN: key present flag appears in body/immobilizer module message when functioning correctly

Diagnostic algorithm

  1. Record all related fault codes and freeze frame data; do not clear until initial data recorded
  2. Visually inspect ignition lock barrel, key reader and harness for mechanical damage, water ingress or corrosion
  3. Check fuses and power/ground at switch and BCM; repair any blown fuses or poor grounds
  4. With ignition off, disconnect connector at key switch/sensor and check for continuity of the switch while inserting/removing key (use multimeter)
  5. Probe the switch harness with key out and key inserted: verify expected voltage change or continuity at the connector relative to ground/battery as per wiring diagram
  6. If switch signals reach harness but not the BCM, perform continuity test from switch connector to BCM pin; repair broken wiring or crimps
  7. If wiring and switch are good, check for correct LIN/CAN messages using a scan tool; diagnose any network faults that affect key status
  8. If BCM or keyless/immobilizer module does not register a valid input despite correct wiring and sensor operation, consider module fault; check for available software updates and follow manufacturer module test/reprogramming procedure
  9. After any repair, clear codes and verify fault does not return; perform multiple insert/remove cycles and road-start checks
  10. Follow manufacturer service manual and wiring diagrams; observe safety precautions when working around the steering column and airbag system

Likely causes

  • Damaged or chafed wiring in steering column (most common)
  • Faulty key-inserted microswitch or sensor in the ignition barrel
  • Loose/poor connector at BCM or ignition switch harness
  • Blown fuse or poor ground connection

Fault status

⚠️ Status
Key Inserted Circuit — open/short or communication fault detected between key sensor and control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

B1350 B1351 B1352 B1354 B1500
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.
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Code

B1353

Other B — Body

Ignition Key-In Circuit Open

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

Causes

  • Open or short in the key inserted wiring (ignition column to BCM)
  • Faulty key-inserted switch or proximity sensor in the ignition barrel/key reader
  • Poor/oxidised connector or pin contact at the switch, BCM or wiring harness
  • Blown fuse or weak battery affecting sensor power/ground
  • Faulty BCM/body control module or immobilizer/keyless module
  • Intermittent mechanical problem in ignition lock cylinder or key reader (sticking/plunger)

Symptoms

  • DTC B1353 stored in memory
  • Dash message or chime indicating key insertion/recognition fault
  • Intermittent or no crank / no start conditions
  • Immobilizer or lock warning lamp illuminated
  • Erratic behaviour of keyless entry/ignition functions
  • Start/stop or accessory functions not working as expected

What to check

  • Read and record all stored DTCs and freeze frame data with a dealer-level or generic scan tool
  • Inspect fuses and relays related to body/ignition circuits
  • Visually inspect ignition lock cylinder, key reader and steering column wiring for damage or corrosion
  • Check connectors at ignition switch/key reader and at BCM for bent pins, corrosion and secure fit
  • Check vehicle battery voltage and ground connections
  • Verify related CAN/LIN network status and errors on the scan tool

Signal parameters

  • Key inserted signal type: usually a switched input to BCM (closed = key present) or a digital status message on LIN/CAN
  • Inactive (key out) expected: open circuit or logic 0; Active (key in) expected: closed circuit or logic 1 / message bit set
  • Typical switched input when active: near battery voltage (~12 V) or pulled low to ground depending on design
  • Continuity: closed switch should show low ohms (
  • CAN/LIN: key present flag appears in body/immobilizer module message when functioning correctly

Diagnostic algorithm

  1. Record all related fault codes and freeze frame data; do not clear until initial data recorded
  2. Visually inspect ignition lock barrel, key reader and harness for mechanical damage, water ingress or corrosion
  3. Check fuses and power/ground at switch and BCM; repair any blown fuses or poor grounds
  4. With ignition off, disconnect connector at key switch/sensor and check for continuity of the switch while inserting/removing key (use multimeter)
  5. Probe the switch harness with key out and key inserted: verify expected voltage change or continuity at the connector relative to ground/battery as per wiring diagram
  6. If switch signals reach harness but not the BCM, perform continuity test from switch connector to BCM pin; repair broken wiring or crimps
  7. If wiring and switch are good, check for correct LIN/CAN messages using a scan tool; diagnose any network faults that affect key status
  8. If BCM or keyless/immobilizer module does not register a valid input despite correct wiring and sensor operation, consider module fault; check for available software updates and follow manufacturer module test/reprogramming procedure
  9. After any repair, clear codes and verify fault does not return; perform multiple insert/remove cycles and road-start checks
  10. Follow manufacturer service manual and wiring diagrams; observe safety precautions when working around the steering column and airbag system

Likely causes

  • Damaged or chafed wiring in steering column (most common)
  • Faulty key-inserted microswitch or sensor in the ignition barrel
  • Loose/poor connector at BCM or ignition switch harness
  • Blown fuse or poor ground connection

Fault status

⚠️ Status
Key Inserted Circuit — open/short or communication fault detected between key sensor and control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

B1350 B1351 B1352 B1354 B1500
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