Code
B1355
ALFA ROMEO
B — Body
Ignition on circuit
Views:
UK: 4
EN: 7
RU: 7
AI status
Completed
Completed
100%
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
- Read and record all codes and freeze frame data with a diagnostic scanner. Clear codes and attempt to reproduce.
- Check battery: confirm good state of charge and connections. Recharge/replace battery if low.
- Inspect and test fuses and ignition/main relays related to BCM and ignition feed; replace any blown or suspicious items.
- With a DVOM, measure ignition feed voltage at the BCM connector while operating key positions. Note if voltage is present, intermittent or absent.
- 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.
- Check module grounds at body/BCM and repair any high-resistance grounds.
- 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).
- 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.
- 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
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Code
B1355
FIAT
B — Body
Ignition on circuit
Views:
UK: 3
EN: 8
RU: 4
AI status
Completed
Completed
100%
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
- Read and record all codes and freeze frame data with a diagnostic scanner. Clear codes and attempt to reproduce.
- Check battery: confirm good state of charge and connections. Recharge/replace battery if low.
- Inspect and test fuses and ignition/main relays related to BCM and ignition feed; replace any blown or suspicious items.
- With a DVOM, measure ignition feed voltage at the BCM connector while operating key positions. Note if voltage is present, intermittent or absent.
- 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.
- Check module grounds at body/BCM and repair any high-resistance grounds.
- 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).
- 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.
- 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
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0
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0
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Code
B1355
LAND ROVER
B — Body
Ignition - circuit failure
Views:
UK: 4
EN: 7
RU: 6
AI status
Completed
Completed
100%
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
- Read and record all codes and freeze frame data with a diagnostic scanner. Clear codes and attempt to reproduce.
- Check battery: confirm good state of charge and connections. Recharge/replace battery if low.
- Inspect and test fuses and ignition/main relays related to BCM and ignition feed; replace any blown or suspicious items.
- With a DVOM, measure ignition feed voltage at the BCM connector while operating key positions. Note if voltage is present, intermittent or absent.
- 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.
- Check module grounds at body/BCM and repair any high-resistance grounds.
- 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).
- 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.
- 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
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Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
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0
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Code
B1355
Other
B — Body
Ignition Run Circuit Failure
Views:
UK: 15
EN: 21
RU: 20
AI status
Completed
Completed
100%
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
- Read and record all codes and freeze frame data with a diagnostic scanner. Clear codes and attempt to reproduce.
- Check battery: confirm good state of charge and connections. Recharge/replace battery if low.
- Inspect and test fuses and ignition/main relays related to BCM and ignition feed; replace any blown or suspicious items.
- With a DVOM, measure ignition feed voltage at the BCM connector while operating key positions. Note if voltage is present, intermittent or absent.
- 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.
- Check module grounds at body/BCM and repair any high-resistance grounds.
- 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).
- 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.
- 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
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