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Home / DTC / B1352 — Key inserted circuit

B1352 — Key inserted circuit

Detailed page for trouble code B1352.

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Code

B1352

ALFA ROMEO B — Body

Key inserted circuit

Brand: ALFA ROMEO
Type: B — Body
Views: UK: 3 EN: 5 RU: 6
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty key-inserted switch or reader (mechanical or electrical failure)
  • Open or short in wiring harness between switch/reader and body/immobilizer control module
  • Corroded or loose connector at the switch, antenna coil or control module
  • Blown fuse or poor power/ground supply to the key detection circuitry
  • Faulty body control module (BCM) or immobilizer module
  • Faulty key transponder or damaged key

Symptoms

  • Immobilizer or key warning lamp illuminated
  • Vehicle does not recognize key or will not crank
  • Warnings on instrument cluster such as "Key not detected"
  • Intermittent start/no-start condition when key is inserted
  • No change in key-inserted status reported by diagnostic tool
  • Inability to lock/unlock or start with remote/key functions affected

What to check

  • Read and record freeze frame and stored codes with a capable scan tool; check for related immobilizer or network codes
  • Visually inspect fuse(s) related to the body/immobilizer/key reader
  • Inspect connectors and wiring at the ignition switch/reader, antenna coil and control module for corrosion, pin damage, or water ingress
  • Wiggle test wiring and connectors while monitoring the key-detected parameter with a scan tool
  • Measure supply voltage and ground at the key-inserted switch/reader connector with key inserted and removed
  • Attempt with a known-good/spare key to rule out a damaged transponder key

Signal parameters

  • Expected: Key-inserted signal = battery voltage (approx. 12 V) or logic-level high when key inserted; 0 V or logic low when removed (verify with wiring diagram)
  • Switch/reader contact resistance: near 0 ohms (closed) when key inserted; open circuit when removed
  • CAN/diagnostic parameter: key-present flag should change state in BCM/immobilizer data stream when key is inserted/removed
  • Continuity between switch/reader signal pin and BCM/immobilizer input pin (low ohms)
  • If fitted, antenna coil impedance within manufacturer spec (requires wiring diagram/service info)

Diagnostic algorithm

  1. Confirm code B1352 with a techno-specific scan tool and check for coexisting codes (immobilizer, BCM, network). Note freeze-frame data.
  2. Check relevant fuses and relays for the body/immobilizer/key reader circuit; replace any blown fuse and retest.
  3. Visually inspect the ignition barrel/key reader, antenna coil and associated connectors for damage, corrosion or foreign objects; clean and reseat connectors.
  4. With the ignition switch/key reader accessible, backprobe the power, ground and signal pins and observe voltages with key inserted and removed. Compare to expected signal parameters.
  5. Perform a continuity/resistance check between the key-inserted switch/reader signal pin and the BCM/immobilizer module input pin; repair any open or high-resistance wiring.
  6. If intermittent, perform a wiggle test of harnesses while monitoring the key-detected parameter for changes; repair broken wires or terminal issues.
  7. Test with a known-good spare key to rule out a damaged transponder; if spare works, service or replace primary key.
  8. If wiring, power and the switch/reader pass tests but code remains, consult manufacturer wiring diagrams and consider replacing the key reader/antenna coil assembly.
  9. If the new reader still fails or wiring checks are satisfactory, suspect BCM/immobilizer module fault—verify network communications and module power/grounds before module replacement or reprogramming. Use dealer-level procedures for module replacement/programming.
  10. After any repair, clear codes and confirm the fault does not return under normal operation; recheck with scan tool for proper key-detected status.

Likely causes

  • Intermittent or missing 12 V supply to the key inserted switch/reader
  • Broken wire or connector pin corrosion at the ignition barrel/reader connector
  • Failed proximity/antenna coil (key reader) around the ignition
  • Ground fault causing unreliable signal return
  • Software/firmware fault or internal failure in BCM/immobilizer module

Fault status

⚠️ Status
Key inserted circuit fault detected — key presence signal missing or inconsistent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1350 B1351 B1353 B1600 B1830 U0121
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Code

B1352

FIAT B — Body

Key inserted circuit

Brand: FIAT
Type: B — Body
Views: UK: 4 EN: 5 RU: 6
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty key-inserted switch or reader (mechanical or electrical failure)
  • Open or short in wiring harness between switch/reader and body/immobilizer control module
  • Corroded or loose connector at the switch, antenna coil or control module
  • Blown fuse or poor power/ground supply to the key detection circuitry
  • Faulty body control module (BCM) or immobilizer module
  • Faulty key transponder or damaged key

Symptoms

  • Immobilizer or key warning lamp illuminated
  • Vehicle does not recognize key or will not crank
  • Warnings on instrument cluster such as "Key not detected"
  • Intermittent start/no-start condition when key is inserted
  • No change in key-inserted status reported by diagnostic tool
  • Inability to lock/unlock or start with remote/key functions affected

What to check

  • Read and record freeze frame and stored codes with a capable scan tool; check for related immobilizer or network codes
  • Visually inspect fuse(s) related to the body/immobilizer/key reader
  • Inspect connectors and wiring at the ignition switch/reader, antenna coil and control module for corrosion, pin damage, or water ingress
  • Wiggle test wiring and connectors while monitoring the key-detected parameter with a scan tool
  • Measure supply voltage and ground at the key-inserted switch/reader connector with key inserted and removed
  • Attempt with a known-good/spare key to rule out a damaged transponder key

Signal parameters

  • Expected: Key-inserted signal = battery voltage (approx. 12 V) or logic-level high when key inserted; 0 V or logic low when removed (verify with wiring diagram)
  • Switch/reader contact resistance: near 0 ohms (closed) when key inserted; open circuit when removed
  • CAN/diagnostic parameter: key-present flag should change state in BCM/immobilizer data stream when key is inserted/removed
  • Continuity between switch/reader signal pin and BCM/immobilizer input pin (low ohms)
  • If fitted, antenna coil impedance within manufacturer spec (requires wiring diagram/service info)

Diagnostic algorithm

  1. Confirm code B1352 with a techno-specific scan tool and check for coexisting codes (immobilizer, BCM, network). Note freeze-frame data.
  2. Check relevant fuses and relays for the body/immobilizer/key reader circuit; replace any blown fuse and retest.
  3. Visually inspect the ignition barrel/key reader, antenna coil and associated connectors for damage, corrosion or foreign objects; clean and reseat connectors.
  4. With the ignition switch/key reader accessible, backprobe the power, ground and signal pins and observe voltages with key inserted and removed. Compare to expected signal parameters.
  5. Perform a continuity/resistance check between the key-inserted switch/reader signal pin and the BCM/immobilizer module input pin; repair any open or high-resistance wiring.
  6. If intermittent, perform a wiggle test of harnesses while monitoring the key-detected parameter for changes; repair broken wires or terminal issues.
  7. Test with a known-good spare key to rule out a damaged transponder; if spare works, service or replace primary key.
  8. If wiring, power and the switch/reader pass tests but code remains, consult manufacturer wiring diagrams and consider replacing the key reader/antenna coil assembly.
  9. If the new reader still fails or wiring checks are satisfactory, suspect BCM/immobilizer module fault—verify network communications and module power/grounds before module replacement or reprogramming. Use dealer-level procedures for module replacement/programming.
  10. After any repair, clear codes and confirm the fault does not return under normal operation; recheck with scan tool for proper key-detected status.

Likely causes

  • Intermittent or missing 12 V supply to the key inserted switch/reader
  • Broken wire or connector pin corrosion at the ignition barrel/reader connector
  • Failed proximity/antenna coil (key reader) around the ignition
  • Ground fault causing unreliable signal return
  • Software/firmware fault or internal failure in BCM/immobilizer module

Fault status

⚠️ Status
Key inserted circuit fault detected — key presence signal missing or inconsistent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1350 B1351 B1353 B1600 B1830 U0121
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

B1352

LAND ROVER B — Body

Circuit failure in insertion

Brand: LAND ROVER
Type: B — Body
Views: UK: 5 EN: 5 RU: 4
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty key-inserted switch or reader (mechanical or electrical failure)
  • Open or short in wiring harness between switch/reader and body/immobilizer control module
  • Corroded or loose connector at the switch, antenna coil or control module
  • Blown fuse or poor power/ground supply to the key detection circuitry
  • Faulty body control module (BCM) or immobilizer module
  • Faulty key transponder or damaged key

Symptoms

  • Immobilizer or key warning lamp illuminated
  • Vehicle does not recognize key or will not crank
  • Warnings on instrument cluster such as "Key not detected"
  • Intermittent start/no-start condition when key is inserted
  • No change in key-inserted status reported by diagnostic tool
  • Inability to lock/unlock or start with remote/key functions affected

What to check

  • Read and record freeze frame and stored codes with a capable scan tool; check for related immobilizer or network codes
  • Visually inspect fuse(s) related to the body/immobilizer/key reader
  • Inspect connectors and wiring at the ignition switch/reader, antenna coil and control module for corrosion, pin damage, or water ingress
  • Wiggle test wiring and connectors while monitoring the key-detected parameter with a scan tool
  • Measure supply voltage and ground at the key-inserted switch/reader connector with key inserted and removed
  • Attempt with a known-good/spare key to rule out a damaged transponder key

Signal parameters

  • Expected: Key-inserted signal = battery voltage (approx. 12 V) or logic-level high when key inserted; 0 V or logic low when removed (verify with wiring diagram)
  • Switch/reader contact resistance: near 0 ohms (closed) when key inserted; open circuit when removed
  • CAN/diagnostic parameter: key-present flag should change state in BCM/immobilizer data stream when key is inserted/removed
  • Continuity between switch/reader signal pin and BCM/immobilizer input pin (low ohms)
  • If fitted, antenna coil impedance within manufacturer spec (requires wiring diagram/service info)

Diagnostic algorithm

  1. Confirm code B1352 with a techno-specific scan tool and check for coexisting codes (immobilizer, BCM, network). Note freeze-frame data.
  2. Check relevant fuses and relays for the body/immobilizer/key reader circuit; replace any blown fuse and retest.
  3. Visually inspect the ignition barrel/key reader, antenna coil and associated connectors for damage, corrosion or foreign objects; clean and reseat connectors.
  4. With the ignition switch/key reader accessible, backprobe the power, ground and signal pins and observe voltages with key inserted and removed. Compare to expected signal parameters.
  5. Perform a continuity/resistance check between the key-inserted switch/reader signal pin and the BCM/immobilizer module input pin; repair any open or high-resistance wiring.
  6. If intermittent, perform a wiggle test of harnesses while monitoring the key-detected parameter for changes; repair broken wires or terminal issues.
  7. Test with a known-good spare key to rule out a damaged transponder; if spare works, service or replace primary key.
  8. If wiring, power and the switch/reader pass tests but code remains, consult manufacturer wiring diagrams and consider replacing the key reader/antenna coil assembly.
  9. If the new reader still fails or wiring checks are satisfactory, suspect BCM/immobilizer module fault—verify network communications and module power/grounds before module replacement or reprogramming. Use dealer-level procedures for module replacement/programming.
  10. After any repair, clear codes and confirm the fault does not return under normal operation; recheck with scan tool for proper key-detected status.

Likely causes

  • Intermittent or missing 12 V supply to the key inserted switch/reader
  • Broken wire or connector pin corrosion at the ignition barrel/reader connector
  • Failed proximity/antenna coil (key reader) around the ignition
  • Ground fault causing unreliable signal return
  • Software/firmware fault or internal failure in BCM/immobilizer module

Fault status

⚠️ Status
Key inserted circuit fault detected — key presence signal missing or inconsistent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1350 B1351 B1353 B1600 B1830 U0121
Workshop Manuals

Repair manuals for LAND ROVER

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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
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Short description

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Contents
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Download
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+100 karma for a short comment :)
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Code

B1352

Other B — Body

Ignition Key-In Circuit Failure

Brand: Other
Type: B — Body
Views: UK: 13 EN: 15 RU: 15
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty key-inserted switch or reader (mechanical or electrical failure)
  • Open or short in wiring harness between switch/reader and body/immobilizer control module
  • Corroded or loose connector at the switch, antenna coil or control module
  • Blown fuse or poor power/ground supply to the key detection circuitry
  • Faulty body control module (BCM) or immobilizer module
  • Faulty key transponder or damaged key

Symptoms

  • Immobilizer or key warning lamp illuminated
  • Vehicle does not recognize key or will not crank
  • Warnings on instrument cluster such as "Key not detected"
  • Intermittent start/no-start condition when key is inserted
  • No change in key-inserted status reported by diagnostic tool
  • Inability to lock/unlock or start with remote/key functions affected

What to check

  • Read and record freeze frame and stored codes with a capable scan tool; check for related immobilizer or network codes
  • Visually inspect fuse(s) related to the body/immobilizer/key reader
  • Inspect connectors and wiring at the ignition switch/reader, antenna coil and control module for corrosion, pin damage, or water ingress
  • Wiggle test wiring and connectors while monitoring the key-detected parameter with a scan tool
  • Measure supply voltage and ground at the key-inserted switch/reader connector with key inserted and removed
  • Attempt with a known-good/spare key to rule out a damaged transponder key

Signal parameters

  • Expected: Key-inserted signal = battery voltage (approx. 12 V) or logic-level high when key inserted; 0 V or logic low when removed (verify with wiring diagram)
  • Switch/reader contact resistance: near 0 ohms (closed) when key inserted; open circuit when removed
  • CAN/diagnostic parameter: key-present flag should change state in BCM/immobilizer data stream when key is inserted/removed
  • Continuity between switch/reader signal pin and BCM/immobilizer input pin (low ohms)
  • If fitted, antenna coil impedance within manufacturer spec (requires wiring diagram/service info)

Diagnostic algorithm

  1. Confirm code B1352 with a techno-specific scan tool and check for coexisting codes (immobilizer, BCM, network). Note freeze-frame data.
  2. Check relevant fuses and relays for the body/immobilizer/key reader circuit; replace any blown fuse and retest.
  3. Visually inspect the ignition barrel/key reader, antenna coil and associated connectors for damage, corrosion or foreign objects; clean and reseat connectors.
  4. With the ignition switch/key reader accessible, backprobe the power, ground and signal pins and observe voltages with key inserted and removed. Compare to expected signal parameters.
  5. Perform a continuity/resistance check between the key-inserted switch/reader signal pin and the BCM/immobilizer module input pin; repair any open or high-resistance wiring.
  6. If intermittent, perform a wiggle test of harnesses while monitoring the key-detected parameter for changes; repair broken wires or terminal issues.
  7. Test with a known-good spare key to rule out a damaged transponder; if spare works, service or replace primary key.
  8. If wiring, power and the switch/reader pass tests but code remains, consult manufacturer wiring diagrams and consider replacing the key reader/antenna coil assembly.
  9. If the new reader still fails or wiring checks are satisfactory, suspect BCM/immobilizer module fault—verify network communications and module power/grounds before module replacement or reprogramming. Use dealer-level procedures for module replacement/programming.
  10. After any repair, clear codes and confirm the fault does not return under normal operation; recheck with scan tool for proper key-detected status.

Likely causes

  • Intermittent or missing 12 V supply to the key inserted switch/reader
  • Broken wire or connector pin corrosion at the ignition barrel/reader connector
  • Failed proximity/antenna coil (key reader) around the ignition
  • Ground fault causing unreliable signal return
  • Software/firmware fault or internal failure in BCM/immobilizer module

Fault status

⚠️ Status
Key inserted circuit fault detected — key presence signal missing or inconsistent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1350 B1351 B1353 B1600 B1830 U0121
Workshop Manuals

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Years: 2021 Manual in English Pages: 186 82.7 MB
Short description

Official Audi Service Training self‑study programme SSP 685 for the Audi Q4 e‑tron (Type F4). Covers body, power units, power transmission, running gear, electrics & electronics, high‑voltage system, thermal management, driver assist and infotainment. Intended for internal service training and technical familiarisation; not a workshop repair manual.

Contents
Key sections:
  • Introduction
  • - Introduction to Audi Q4 e-tron
  • - Dimensions
  • Body
  • - Body structure and materials
  • - Joining techniques
  • - Securing high-voltage battery and force progression
  • - Body assembly (doors, rear lid, panoramic sunroof)
  • - Dash panel and centre console
  • Power units
  • - Technical data: rear electric motor (VX90)
  • - Technical data: front electric motor (VX89)
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Audi Q8 (2018) — Electrical System Workshop Manual (Edition 05.2019)

Workshop Manual
Years: 2018 Manual in English Pages: 645 14.8 MB
Short description

Workshop manual for the Audi Q8 (2018) — Electrical System. Includes technical data, safety notes and step‑by‑step repair procedures for battery/charging, starter/alternator, lighting, washer/wiper and wiring. Edition 05.2019.

Contents
Key sections:
  • 00 - Technical data
  • 1 Safety precautions
  • 1.1 Safety precautions when working on vehicles with start/stop system
  • 1.2 Safety precautions when using testers and measuring instruments during a road test
  • 1.3 Notes on use and safety for LED headlights and Audi laser lights
  • 2 Repair notes
  • 2.1 Rules for cleanliness
  • 2.2 General notes
  • 2.3 Contact corrosion
  • 2.4 ESD (electrostatic discharge) workplace
  • 2.5 Routing and attachment of lines and wiring
  • 2.6 Identification plates
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Audi Servicing Manual — 7‑Speed Dual Clutch Transmission 0CJ / 0CL / 0CK / 0DN / 0DP / 0HL (Edition 05.2018)

Workshop Manual
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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