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Home / DTC / B1355 — Ignition on circuit

B1355 — Ignition on circuit

Detailed page for trouble code B1355.

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59brands
11,914generic
22,491specific
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Code

B1355

ALFA ROMEO B — Body

Ignition on circuit

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

Causes

  • Blown fuse for ignition feed
  • Faulty ignition switch or keyless start module
  • Open, shorted or corroded wiring/connector on ignition feed circuit
  • Faulty relay (ignition/main power relay)
  • Poor or missing ground
  • Defective body control module (BCM) or other control module reporting the signal

Symptoms

  • Vehicle won't crank or start intermittently
  • Accessories or instrument cluster do not come on with key ON
  • Random loss of electrical functions when key is on
  • Battery draining or rapid voltage drop when key is on
  • Multiple modules report related communication or voltage DTCs
  • Starter engages unexpectedly or fails to engage

What to check

  • Retrieve all stored DTCs and freeze frame data; note related U or P codes
  • Check battery resting voltage and voltage with key ON (should be ~12–14V)
  • Inspect fuses and ignition feed relays for the BCM and related modules
  • Visual inspection of ignition switch, pushbutton module and wiring harness for damage or corrosion
  • Check for good engine/chassis grounds at BCM and battery negative
  • Use a multimeter to check for presence/absence of ignition-on voltage at the BCM ignition input pin with key OFF/ACC/ON/START

Signal parameters

  • Ignition feed voltage (IGN or RUN): approx. battery voltage (~11.5–14.5 V) when key ON
  • Voltage should transition from 0 V (key OFF) to battery voltage (key ON/ACC/Run) on the ignition feed circuit
  • Logic level on multiplexed/start-stop systems may be a CAN message rather than a dedicated 12V line
  • Measure continuity: near 0 ohms between ignition switch output and BCM feed pin (with power isolated)
  • No excessive voltage drop across relay/fuse (less than ~0.5 V under load)

Diagnostic algorithm

  1. Read and record all codes and freeze frame data with a diagnostic scanner. Clear codes and attempt to reproduce.
  2. Check battery: confirm good state of charge and connections. Recharge/replace battery if low.
  3. Inspect and test fuses and ignition/main relays related to BCM and ignition feed; replace any blown or suspicious items.
  4. With a DVOM, measure ignition feed voltage at the BCM connector while operating key positions. Note if voltage is present, intermittent or absent.
  5. If feed is absent at BCM, back-probe at ignition switch output and relay contacts to locate where voltage is lost. Repair/open circuit or connector issues found.
  6. Check module grounds at body/BCM and repair any high-resistance grounds.
  7. If harness and power components test OK but the module does not see the ignition signal, check for communication/CAN errors and verify related module inputs (start/stop module).
  8. If wiring and related components are good and the signal is still incorrect, consider module fault. Verify software/calibration updates from manufacturer before replacing the module.
  9. After repair, clear codes and confirm fault does not return through multiple ignition cycles and normal operation.

Likely causes

  • Blown fuse or faulty ignition relay supplying the BCM
  • Loose or corroded connector at ignition switch or BCM power pin
  • Broken wire in harness between ignition switch and BCM
  • Faulty ignition switch or start/stop pushbutton module
  • Intermittent ground at BCM or shared ground point

Fault status

⚠️ Status
Ignition ON circuit signal missing or out of range — control module reports no valid ignition feed when expected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

U0100 U0121 P0562 P0615 B1299
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

B1355

FIAT B — Body

Ignition on circuit

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

Causes

  • Blown fuse for ignition feed
  • Faulty ignition switch or keyless start module
  • Open, shorted or corroded wiring/connector on ignition feed circuit
  • Faulty relay (ignition/main power relay)
  • Poor or missing ground
  • Defective body control module (BCM) or other control module reporting the signal

Symptoms

  • Vehicle won't crank or start intermittently
  • Accessories or instrument cluster do not come on with key ON
  • Random loss of electrical functions when key is on
  • Battery draining or rapid voltage drop when key is on
  • Multiple modules report related communication or voltage DTCs
  • Starter engages unexpectedly or fails to engage

What to check

  • Retrieve all stored DTCs and freeze frame data; note related U or P codes
  • Check battery resting voltage and voltage with key ON (should be ~12–14V)
  • Inspect fuses and ignition feed relays for the BCM and related modules
  • Visual inspection of ignition switch, pushbutton module and wiring harness for damage or corrosion
  • Check for good engine/chassis grounds at BCM and battery negative
  • Use a multimeter to check for presence/absence of ignition-on voltage at the BCM ignition input pin with key OFF/ACC/ON/START

Signal parameters

  • Ignition feed voltage (IGN or RUN): approx. battery voltage (~11.5–14.5 V) when key ON
  • Voltage should transition from 0 V (key OFF) to battery voltage (key ON/ACC/Run) on the ignition feed circuit
  • Logic level on multiplexed/start-stop systems may be a CAN message rather than a dedicated 12V line
  • Measure continuity: near 0 ohms between ignition switch output and BCM feed pin (with power isolated)
  • No excessive voltage drop across relay/fuse (less than ~0.5 V under load)

Diagnostic algorithm

  1. Read and record all codes and freeze frame data with a diagnostic scanner. Clear codes and attempt to reproduce.
  2. Check battery: confirm good state of charge and connections. Recharge/replace battery if low.
  3. Inspect and test fuses and ignition/main relays related to BCM and ignition feed; replace any blown or suspicious items.
  4. With a DVOM, measure ignition feed voltage at the BCM connector while operating key positions. Note if voltage is present, intermittent or absent.
  5. If feed is absent at BCM, back-probe at ignition switch output and relay contacts to locate where voltage is lost. Repair/open circuit or connector issues found.
  6. Check module grounds at body/BCM and repair any high-resistance grounds.
  7. If harness and power components test OK but the module does not see the ignition signal, check for communication/CAN errors and verify related module inputs (start/stop module).
  8. If wiring and related components are good and the signal is still incorrect, consider module fault. Verify software/calibration updates from manufacturer before replacing the module.
  9. After repair, clear codes and confirm fault does not return through multiple ignition cycles and normal operation.

Likely causes

  • Blown fuse or faulty ignition relay supplying the BCM
  • Loose or corroded connector at ignition switch or BCM power pin
  • Broken wire in harness between ignition switch and BCM
  • Faulty ignition switch or start/stop pushbutton module
  • Intermittent ground at BCM or shared ground point

Fault status

⚠️ Status
Ignition ON circuit signal missing or out of range — control module reports no valid ignition feed when expected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

U0100 U0121 P0562 P0615 B1299
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

B1355

LAND ROVER B — Body

Ignition - circuit failure

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

Causes

  • Blown fuse for ignition feed
  • Faulty ignition switch or keyless start module
  • Open, shorted or corroded wiring/connector on ignition feed circuit
  • Faulty relay (ignition/main power relay)
  • Poor or missing ground
  • Defective body control module (BCM) or other control module reporting the signal

Symptoms

  • Vehicle won't crank or start intermittently
  • Accessories or instrument cluster do not come on with key ON
  • Random loss of electrical functions when key is on
  • Battery draining or rapid voltage drop when key is on
  • Multiple modules report related communication or voltage DTCs
  • Starter engages unexpectedly or fails to engage

What to check

  • Retrieve all stored DTCs and freeze frame data; note related U or P codes
  • Check battery resting voltage and voltage with key ON (should be ~12–14V)
  • Inspect fuses and ignition feed relays for the BCM and related modules
  • Visual inspection of ignition switch, pushbutton module and wiring harness for damage or corrosion
  • Check for good engine/chassis grounds at BCM and battery negative
  • Use a multimeter to check for presence/absence of ignition-on voltage at the BCM ignition input pin with key OFF/ACC/ON/START

Signal parameters

  • Ignition feed voltage (IGN or RUN): approx. battery voltage (~11.5–14.5 V) when key ON
  • Voltage should transition from 0 V (key OFF) to battery voltage (key ON/ACC/Run) on the ignition feed circuit
  • Logic level on multiplexed/start-stop systems may be a CAN message rather than a dedicated 12V line
  • Measure continuity: near 0 ohms between ignition switch output and BCM feed pin (with power isolated)
  • No excessive voltage drop across relay/fuse (less than ~0.5 V under load)

Diagnostic algorithm

  1. Read and record all codes and freeze frame data with a diagnostic scanner. Clear codes and attempt to reproduce.
  2. Check battery: confirm good state of charge and connections. Recharge/replace battery if low.
  3. Inspect and test fuses and ignition/main relays related to BCM and ignition feed; replace any blown or suspicious items.
  4. With a DVOM, measure ignition feed voltage at the BCM connector while operating key positions. Note if voltage is present, intermittent or absent.
  5. If feed is absent at BCM, back-probe at ignition switch output and relay contacts to locate where voltage is lost. Repair/open circuit or connector issues found.
  6. Check module grounds at body/BCM and repair any high-resistance grounds.
  7. If harness and power components test OK but the module does not see the ignition signal, check for communication/CAN errors and verify related module inputs (start/stop module).
  8. If wiring and related components are good and the signal is still incorrect, consider module fault. Verify software/calibration updates from manufacturer before replacing the module.
  9. After repair, clear codes and confirm fault does not return through multiple ignition cycles and normal operation.

Likely causes

  • Blown fuse or faulty ignition relay supplying the BCM
  • Loose or corroded connector at ignition switch or BCM power pin
  • Broken wire in harness between ignition switch and BCM
  • Faulty ignition switch or start/stop pushbutton module
  • Intermittent ground at BCM or shared ground point

Fault status

⚠️ Status
Ignition ON circuit signal missing or out of range — control module reports no valid ignition feed when expected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

U0100 U0121 P0562 P0615 B1299
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.
Send to email
Code

B1355

Other B — Body

Ignition Run Circuit Failure

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

Causes

  • Blown fuse for ignition feed
  • Faulty ignition switch or keyless start module
  • Open, shorted or corroded wiring/connector on ignition feed circuit
  • Faulty relay (ignition/main power relay)
  • Poor or missing ground
  • Defective body control module (BCM) or other control module reporting the signal

Symptoms

  • Vehicle won't crank or start intermittently
  • Accessories or instrument cluster do not come on with key ON
  • Random loss of electrical functions when key is on
  • Battery draining or rapid voltage drop when key is on
  • Multiple modules report related communication or voltage DTCs
  • Starter engages unexpectedly or fails to engage

What to check

  • Retrieve all stored DTCs and freeze frame data; note related U or P codes
  • Check battery resting voltage and voltage with key ON (should be ~12–14V)
  • Inspect fuses and ignition feed relays for the BCM and related modules
  • Visual inspection of ignition switch, pushbutton module and wiring harness for damage or corrosion
  • Check for good engine/chassis grounds at BCM and battery negative
  • Use a multimeter to check for presence/absence of ignition-on voltage at the BCM ignition input pin with key OFF/ACC/ON/START

Signal parameters

  • Ignition feed voltage (IGN or RUN): approx. battery voltage (~11.5–14.5 V) when key ON
  • Voltage should transition from 0 V (key OFF) to battery voltage (key ON/ACC/Run) on the ignition feed circuit
  • Logic level on multiplexed/start-stop systems may be a CAN message rather than a dedicated 12V line
  • Measure continuity: near 0 ohms between ignition switch output and BCM feed pin (with power isolated)
  • No excessive voltage drop across relay/fuse (less than ~0.5 V under load)

Diagnostic algorithm

  1. Read and record all codes and freeze frame data with a diagnostic scanner. Clear codes and attempt to reproduce.
  2. Check battery: confirm good state of charge and connections. Recharge/replace battery if low.
  3. Inspect and test fuses and ignition/main relays related to BCM and ignition feed; replace any blown or suspicious items.
  4. With a DVOM, measure ignition feed voltage at the BCM connector while operating key positions. Note if voltage is present, intermittent or absent.
  5. If feed is absent at BCM, back-probe at ignition switch output and relay contacts to locate where voltage is lost. Repair/open circuit or connector issues found.
  6. Check module grounds at body/BCM and repair any high-resistance grounds.
  7. If harness and power components test OK but the module does not see the ignition signal, check for communication/CAN errors and verify related module inputs (start/stop module).
  8. If wiring and related components are good and the signal is still incorrect, consider module fault. Verify software/calibration updates from manufacturer before replacing the module.
  9. After repair, clear codes and confirm fault does not return through multiple ignition cycles and normal operation.

Likely causes

  • Blown fuse or faulty ignition relay supplying the BCM
  • Loose or corroded connector at ignition switch or BCM power pin
  • Broken wire in harness between ignition switch and BCM
  • Faulty ignition switch or start/stop pushbutton module
  • Intermittent ground at BCM or shared ground point

Fault status

⚠️ Status
Ignition ON circuit signal missing or out of range — control module reports no valid ignition feed when expected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

U0100 U0121 P0562 P0615 B1299
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