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Home / DTC / B1353 — Key inserted circuit

B1353 — Key inserted circuit

Detailed page for trouble code B1353.

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Code

B1353

ALFA ROMEO B — Body

Key inserted circuit

Brand: ALFA ROMEO
Type: B — Body
Views: UK: 7 EN: 5 RU: 6
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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Code

B1353

FIAT B — Body

Key inserted circuit

Brand: FIAT
Type: B — Body
Views: UK: 8 EN: 5 RU: 9
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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Code

B1353

LAND ROVER B — Body

Front right - face shock absorber motor

Brand: LAND ROVER
Type: B — Body
Views: UK: 6 EN: 6 RU: 6
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
Workshop Manuals

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3

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Official workshop manual for the Land Rover Defender 300Tdi (from 1996 model year). Contains specifications, adjustment, fault diagnosis and step-by-step repair and overhaul procedures for engine, transmission, axles, suspension, brakes, electrical and body. Intended for dealer workshops and trained technicians.

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Short description

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Download
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Code

B1353

Other B — Body

Ignition Key-In Circuit Open

Brand: Other
Type: B — Body
Views: UK: 18 EN: 17 RU: 23
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
Workshop Manuals

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2
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Short description

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Contents
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Short description

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Key sections:
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Years: 2008–2019 Manual in English Pages: 128 11.1 MB
Short description

Service manual for the 7‑Speed dual‑clutch (DSG) transmissions 0CJ/0CL/0CK/0DN/0DP/0HL fitted to various Audi models. Includes repair information, clutch and gearbox disassembly/assembly, mechatronic and hydraulic system procedures, seals and differential work. Edition 05.2018.

Contents
Key sections:
  • 00 - General, Technical Data
  • 1 Repair Information
  • 1.1 General Repair Information
  • 1.2 Contact Corrosion
  • 1.3 ATF Pump, Deactivating and Draining the Hydraulic Pump Reservoir
  • 2 Rules for Cleanliness when Working on DSG® Transmission
  • 30 - Clutch
  • 1 Clutch
  • 1.1 Overview - Flywheel and Dual Clutch
  • 1.2 Flywheel, Removing and Installing
  • 1.3 Dual Clutch, Removing and Installing
  • 1.4 Input Shaft Seal, Replacing
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LAND ROVER 3

Land Rover Defender 300Tdi — Workshop Manual (1996 model year)

Workshop Manual
Defender 300Tdi Years: 1996 Manual in English 7.5 MB
Short description

Official workshop manual for the Land Rover Defender 300Tdi (from 1996 model year). Contains specifications, adjustment, fault diagnosis and step-by-step repair and overhaul procedures for engine, transmission, axles, suspension, brakes, electrical and body. Intended for dealer workshops and trained technicians.

Contents
Key sections:
  • 01 INTRODUCTION
  • 04 GENERAL SPECIFICATION DATA
  • 05 ENGINE TUNING DATA
  • 07 GENERAL FITTING REMINDERS
  • 09 LUBRICANTS, FLUIDS AND CAPACITIES
  • 10 MAINTENANCE
  • 12 ENGINE Tdi
  • - Description and operation
  • - Fault diagnosis
  • - Adjustment
  • - Repair and overhaul procedures
  • 19 FUEL SYSTEM Tdi
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Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)

Workshop Manual
Defender Years: 1999–2002 Manual in English 7.6 MB
Short description

Workshop Manual Supplement and Body Repair Manual for the Land Rover Defender. Includes general specifications, maintenance schedules, tuning data and step‑by‑step repair procedures for engine, transmission, suspension, brakes, electrical and body repairs. Covers Defender models from 1999 and 2002 model years.

Contents
Key sections:
  • 01 - INTRODUCTION
  • - Introduction
  • - Dimensions
  • - References
  • - Repairs and replacements
  • - Poisonous substances
  • - Fuel handling precautions
  • - Synthetic rubber
  • - Recommended sealants
  • - Used engine oil precautions
  • - Accessories and conversions
  • - Wheels and tyres
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Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)

Workshop Manual
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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