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Home / DTC / B1359 — Accessory position 1 circuit

B1359 — Accessory position 1 circuit

Detailed page for trouble code B1359.

34,405codes
59brands
11,914generic
22,491specific
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Code

B1359

ALFA ROMEO B — Body

Accessory position 1 circuit

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

Causes

  • Blown or corroded fuse for accessory circuit
  • Faulty ignition switch (accessory position contact)
  • Open, shorted, or damaged wiring/harness to accessory feed
  • Poor or missing ground connection
  • Faulty relay (if used) in accessory feed
  • Faulty BCM or module reporting the accessory circuit

Symptoms

  • No power to accessories (radio, power windows, cigarette lighter) in ACCESSORY key position
  • Accessories operate intermittently or only in RUN but not ACCESSORY position
  • Accessory-related warning or message on dash
  • DTC present and may prevent certain systems from entering accessory state
  • Possible battery drain if circuit is shorted to constant power

What to check

  • Retrieve freeze frame and verify B1359 is current or stored; note when it sets (key position, engine off/on)
  • Visual inspection of fuses, fusebox, ignition switch connectors and harnesses for corrosion, damage or loose pins
  • Check related fuse(s) for continuity and correct rating
  • Measure voltage at accessory feed with key OFF, ACC, and RUN
  • Scan for additional related codes (body/BCM codes or low voltage codes)
  • Check for signs of aftermarket installations tied into accessory circuit

Signal parameters

  • Accessory feed voltage: ~0 V with key OFF; ~11–14.5 V with key in ACCESSORY (ACC) position
  • Accessory feed should be isolated from constant 12V when key OFF (no backfeed)
  • Ignition switch contact resistance low when ACC engaged; high (open) when OFF
  • BCM or body module may report accessory position status over vehicle network (should change state when turning key to ACC)

Diagnostic algorithm

  1. Safety first: Park vehicle, key off, disconnect battery if required for tests involving harness repair.
  2. Use a scan tool to confirm the fault, clear DTC, and attempt to re-create the code by cycling the key to ACC. Note if code returns immediately or intermittently.
  3. Inspect fuses and fuseholder for the accessory circuit. Replace blown fuses and verify fuseholder/busbar condition.
  4. At the fuse or accessory feed, with key in ACC, measure voltage relative to chassis ground. If battery voltage is present, the feed is being switched; if not, trace back toward the ignition switch/relay.
  5. Probe the ignition switch accessory terminal: verify voltage changes correctly between OFF, ACC, and RUN. Wiggle test the ignition switch and harness while observing voltage for intermittent faults.
  6. Inspect and test continuity of wiring between ignition switch, accessory fuse/relay and BCM. Repair any open/shorts or damaged insulation.
  7. If a relay is used in the accessory feed, verify relay operation and socket continuity. Swap with a known-good relay if uncertain.
  8. Check grounds associated with the BCM and accessory circuits for corrosion, paint, or loose bolts; clean and tighten as needed.
  9. If wiring and mechanical switch test good, monitor the BCM input/state with a diagnostic tool to ensure it receives the accessory position signal. If the BCM does not register the change, consider BCM fault.
  10. After repairs, clear the DTC, verify proper accessory operation across key positions, and road/test as needed to ensure the code does not return.

Likely causes

  • Blown fuse or poor fusebox connection
  • Damaged wiring or connector to ignition switch accessory terminal
  • Faulty ignition switch accessory contact
  • Faulty or intermittent BCM/input module

Fault status

⚠️ Status
Accessory Position 1 circuit fault — open/short/incorrect voltage or module communication error
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.5 hours

Similar codes

B1358 B1360 B1361 P0562 U0121
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

B1359

FIAT B — Body

Accessory position 1 circuit

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

Causes

  • Blown or corroded fuse for accessory circuit
  • Faulty ignition switch (accessory position contact)
  • Open, shorted, or damaged wiring/harness to accessory feed
  • Poor or missing ground connection
  • Faulty relay (if used) in accessory feed
  • Faulty BCM or module reporting the accessory circuit

Symptoms

  • No power to accessories (radio, power windows, cigarette lighter) in ACCESSORY key position
  • Accessories operate intermittently or only in RUN but not ACCESSORY position
  • Accessory-related warning or message on dash
  • DTC present and may prevent certain systems from entering accessory state
  • Possible battery drain if circuit is shorted to constant power

What to check

  • Retrieve freeze frame and verify B1359 is current or stored; note when it sets (key position, engine off/on)
  • Visual inspection of fuses, fusebox, ignition switch connectors and harnesses for corrosion, damage or loose pins
  • Check related fuse(s) for continuity and correct rating
  • Measure voltage at accessory feed with key OFF, ACC, and RUN
  • Scan for additional related codes (body/BCM codes or low voltage codes)
  • Check for signs of aftermarket installations tied into accessory circuit

Signal parameters

  • Accessory feed voltage: ~0 V with key OFF; ~11–14.5 V with key in ACCESSORY (ACC) position
  • Accessory feed should be isolated from constant 12V when key OFF (no backfeed)
  • Ignition switch contact resistance low when ACC engaged; high (open) when OFF
  • BCM or body module may report accessory position status over vehicle network (should change state when turning key to ACC)

Diagnostic algorithm

  1. Safety first: Park vehicle, key off, disconnect battery if required for tests involving harness repair.
  2. Use a scan tool to confirm the fault, clear DTC, and attempt to re-create the code by cycling the key to ACC. Note if code returns immediately or intermittently.
  3. Inspect fuses and fuseholder for the accessory circuit. Replace blown fuses and verify fuseholder/busbar condition.
  4. At the fuse or accessory feed, with key in ACC, measure voltage relative to chassis ground. If battery voltage is present, the feed is being switched; if not, trace back toward the ignition switch/relay.
  5. Probe the ignition switch accessory terminal: verify voltage changes correctly between OFF, ACC, and RUN. Wiggle test the ignition switch and harness while observing voltage for intermittent faults.
  6. Inspect and test continuity of wiring between ignition switch, accessory fuse/relay and BCM. Repair any open/shorts or damaged insulation.
  7. If a relay is used in the accessory feed, verify relay operation and socket continuity. Swap with a known-good relay if uncertain.
  8. Check grounds associated with the BCM and accessory circuits for corrosion, paint, or loose bolts; clean and tighten as needed.
  9. If wiring and mechanical switch test good, monitor the BCM input/state with a diagnostic tool to ensure it receives the accessory position signal. If the BCM does not register the change, consider BCM fault.
  10. After repairs, clear the DTC, verify proper accessory operation across key positions, and road/test as needed to ensure the code does not return.

Likely causes

  • Blown fuse or poor fusebox connection
  • Damaged wiring or connector to ignition switch accessory terminal
  • Faulty ignition switch accessory contact
  • Faulty or intermittent BCM/input module

Fault status

⚠️ Status
Accessory Position 1 circuit fault — open/short/incorrect voltage or module communication error
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.5 hours

Similar codes

B1358 B1360 B1361 P0562 U0121
Repair manuals

Manual library for FIAT

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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

B1359

LAND ROVER B — Body

Ignition / accessory - circuit failure

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

Causes

  • Blown or corroded fuse for accessory circuit
  • Faulty ignition switch (accessory position contact)
  • Open, shorted, or damaged wiring/harness to accessory feed
  • Poor or missing ground connection
  • Faulty relay (if used) in accessory feed
  • Faulty BCM or module reporting the accessory circuit

Symptoms

  • No power to accessories (radio, power windows, cigarette lighter) in ACCESSORY key position
  • Accessories operate intermittently or only in RUN but not ACCESSORY position
  • Accessory-related warning or message on dash
  • DTC present and may prevent certain systems from entering accessory state
  • Possible battery drain if circuit is shorted to constant power

What to check

  • Retrieve freeze frame and verify B1359 is current or stored; note when it sets (key position, engine off/on)
  • Visual inspection of fuses, fusebox, ignition switch connectors and harnesses for corrosion, damage or loose pins
  • Check related fuse(s) for continuity and correct rating
  • Measure voltage at accessory feed with key OFF, ACC, and RUN
  • Scan for additional related codes (body/BCM codes or low voltage codes)
  • Check for signs of aftermarket installations tied into accessory circuit

Signal parameters

  • Accessory feed voltage: ~0 V with key OFF; ~11–14.5 V with key in ACCESSORY (ACC) position
  • Accessory feed should be isolated from constant 12V when key OFF (no backfeed)
  • Ignition switch contact resistance low when ACC engaged; high (open) when OFF
  • BCM or body module may report accessory position status over vehicle network (should change state when turning key to ACC)

Diagnostic algorithm

  1. Safety first: Park vehicle, key off, disconnect battery if required for tests involving harness repair.
  2. Use a scan tool to confirm the fault, clear DTC, and attempt to re-create the code by cycling the key to ACC. Note if code returns immediately or intermittently.
  3. Inspect fuses and fuseholder for the accessory circuit. Replace blown fuses and verify fuseholder/busbar condition.
  4. At the fuse or accessory feed, with key in ACC, measure voltage relative to chassis ground. If battery voltage is present, the feed is being switched; if not, trace back toward the ignition switch/relay.
  5. Probe the ignition switch accessory terminal: verify voltage changes correctly between OFF, ACC, and RUN. Wiggle test the ignition switch and harness while observing voltage for intermittent faults.
  6. Inspect and test continuity of wiring between ignition switch, accessory fuse/relay and BCM. Repair any open/shorts or damaged insulation.
  7. If a relay is used in the accessory feed, verify relay operation and socket continuity. Swap with a known-good relay if uncertain.
  8. Check grounds associated with the BCM and accessory circuits for corrosion, paint, or loose bolts; clean and tighten as needed.
  9. If wiring and mechanical switch test good, monitor the BCM input/state with a diagnostic tool to ensure it receives the accessory position signal. If the BCM does not register the change, consider BCM fault.
  10. After repairs, clear the DTC, verify proper accessory operation across key positions, and road/test as needed to ensure the code does not return.

Likely causes

  • Blown fuse or poor fusebox connection
  • Damaged wiring or connector to ignition switch accessory terminal
  • Faulty ignition switch accessory contact
  • Faulty or intermittent BCM/input module

Fault status

⚠️ Status
Accessory Position 1 circuit fault — open/short/incorrect voltage or module communication error
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.5 hours

Similar codes

B1358 B1360 B1361 P0562 U0121
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

B1359

Other B — Body

Ignition Run/Acc Circuit Failure

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

Causes

  • Blown or corroded fuse for accessory circuit
  • Faulty ignition switch (accessory position contact)
  • Open, shorted, or damaged wiring/harness to accessory feed
  • Poor or missing ground connection
  • Faulty relay (if used) in accessory feed
  • Faulty BCM or module reporting the accessory circuit

Symptoms

  • No power to accessories (radio, power windows, cigarette lighter) in ACCESSORY key position
  • Accessories operate intermittently or only in RUN but not ACCESSORY position
  • Accessory-related warning or message on dash
  • DTC present and may prevent certain systems from entering accessory state
  • Possible battery drain if circuit is shorted to constant power

What to check

  • Retrieve freeze frame and verify B1359 is current or stored; note when it sets (key position, engine off/on)
  • Visual inspection of fuses, fusebox, ignition switch connectors and harnesses for corrosion, damage or loose pins
  • Check related fuse(s) for continuity and correct rating
  • Measure voltage at accessory feed with key OFF, ACC, and RUN
  • Scan for additional related codes (body/BCM codes or low voltage codes)
  • Check for signs of aftermarket installations tied into accessory circuit

Signal parameters

  • Accessory feed voltage: ~0 V with key OFF; ~11–14.5 V with key in ACCESSORY (ACC) position
  • Accessory feed should be isolated from constant 12V when key OFF (no backfeed)
  • Ignition switch contact resistance low when ACC engaged; high (open) when OFF
  • BCM or body module may report accessory position status over vehicle network (should change state when turning key to ACC)

Diagnostic algorithm

  1. Safety first: Park vehicle, key off, disconnect battery if required for tests involving harness repair.
  2. Use a scan tool to confirm the fault, clear DTC, and attempt to re-create the code by cycling the key to ACC. Note if code returns immediately or intermittently.
  3. Inspect fuses and fuseholder for the accessory circuit. Replace blown fuses and verify fuseholder/busbar condition.
  4. At the fuse or accessory feed, with key in ACC, measure voltage relative to chassis ground. If battery voltage is present, the feed is being switched; if not, trace back toward the ignition switch/relay.
  5. Probe the ignition switch accessory terminal: verify voltage changes correctly between OFF, ACC, and RUN. Wiggle test the ignition switch and harness while observing voltage for intermittent faults.
  6. Inspect and test continuity of wiring between ignition switch, accessory fuse/relay and BCM. Repair any open/shorts or damaged insulation.
  7. If a relay is used in the accessory feed, verify relay operation and socket continuity. Swap with a known-good relay if uncertain.
  8. Check grounds associated with the BCM and accessory circuits for corrosion, paint, or loose bolts; clean and tighten as needed.
  9. If wiring and mechanical switch test good, monitor the BCM input/state with a diagnostic tool to ensure it receives the accessory position signal. If the BCM does not register the change, consider BCM fault.
  10. After repairs, clear the DTC, verify proper accessory operation across key positions, and road/test as needed to ensure the code does not return.

Likely causes

  • Blown fuse or poor fusebox connection
  • Damaged wiring or connector to ignition switch accessory terminal
  • Faulty ignition switch accessory contact
  • Faulty or intermittent BCM/input module

Fault status

⚠️ Status
Accessory Position 1 circuit fault — open/short/incorrect voltage or module communication error
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.5 hours

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