Code
B1358
ALFA ROMEO
B — Body
Ignition switch in RUN short to ground
Views:
UK: 4
EN: 8
RU: 4
AI status
Completed
Completed
100%
Causes
- Damaged wiring harness (chafing, pinched cable) in the ignition RUN circuit
- Corroded or loose connector at ignition switch or ECU
- Failed ignition switch (internal short)
- Shorted aftermarket accessory or alarm/immobiliser wiring tapped into RUN circuit
- Water ingress or corrosion in steering column/connector
- Shorted input or driver inside a control module (ECU/BCM)
Symptoms
- No power to accessories or control modules in RUN position
- Engine cranks but does not start, or engine stalls when key is turned to RUN
- Blown fuses related to ignition/ECU circuits
- Instrument cluster warning lights on or erratic
- Intermittent loss of electrical functions that resolve when wiring is moved
What to check
- Read freeze frame / live data and confirm B1358 is current or stored
- Visual inspection of ignition switch, steering column harness, and connectors for damage, corrosion or water
- Check related fuses and fusible links for blown condition
- Measure voltage at ignition switch RUN terminal with key OFF, ACCESSORY, RUN and START
- Perform continuity check between RUN terminal and chassis ground (look for low resistance indicating a short)
- Disconnect aftermarket accessories or alarm/immobiliser wiring from RUN circuit and re-test
Signal parameters
- RUN terminal voltage: ~12 V (battery voltage) with key in RUN/ON; ~0 V when key OFF
- Expected continuity to ground: open/high resistance when circuit is healthy; near 0 Ω indicates direct short to ground
- Typical signal current: very low for the feed to inputs (milliamps); sustained high current indicates a short
- Fuse condition: fuse supplying RUN should be intact unless short has blown it
Diagnostic algorithm
- Record the code, freeze frame and any related codes. Note key position when fault occurred.
- Visually inspect ignition switch and wiring in steering column for damage, signs of overheating, corrosion or water entry.
- With ignition OFF, disconnect the battery negative terminal before doing major repairs. For live tests proceed with caution.
- Check fuses protecting the RUN circuit. Replace any blown fuses and attempt to reproduce the fault to see if fuse blows again.
- With a DMM, measure voltage at the ignition switch RUN terminal while an assistant turns the key to OFF/ACC/RUN. Confirm the terminal shows battery voltage in RUN.
- If RUN terminal is low/grounded, disconnect loads: remove the RUN circuit fuse(s) or disconnect the ECU/BCM connector(s) on that branch and re-check voltage/continuity to locate which branch creates the short.
- Use an ammeter/ clamp meter or amp drop technique to find abnormal current draw on the RUN feed. Pull suspected fuses one at a time to isolate the shorted branch.
- If short is isolated to wiring, repair harness (repair/replace damaged section, secure routing, protect with loom). If short persists with harness disconnected, suspect internal ECU/BCM or ignition switch.
- If ignition switch is suspected, bench-test or swap with a known-good switch. Replace ignition switch if internal short confirmed.
- After repairs, clear the code, re-check for proper RUN voltage and perform road/test drive to verify no recurrence.
Likely causes
- Wiring rubbed through to chassis ground near steering column
- Ignition switch internal contact fault producing a path to ground
- Connector pins corroded or pushed into contact with ground
- Aftermarket device incorrectly wired to RUN line creating a short
- Moisture contamination at a connector in the RUN circuit
Fault status
Status
Ignition switch RUN circuit detected short to ground. ECU/BCM reports RUN input low or overloaded when key is in RUN position. Investigate wiring, connectors, ignition switch and any aftermarket taps.
Repair difficulty: Medium
Diagnostic time: 0.5-3 hours
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Code
B1358
FIAT
B — Body
Ignition switch in RUN short to ground
Views:
UK: 5
EN: 8
RU: 3
AI status
Completed
Completed
100%
Causes
- Damaged wiring harness (chafing, pinched cable) in the ignition RUN circuit
- Corroded or loose connector at ignition switch or ECU
- Failed ignition switch (internal short)
- Shorted aftermarket accessory or alarm/immobiliser wiring tapped into RUN circuit
- Water ingress or corrosion in steering column/connector
- Shorted input or driver inside a control module (ECU/BCM)
Symptoms
- No power to accessories or control modules in RUN position
- Engine cranks but does not start, or engine stalls when key is turned to RUN
- Blown fuses related to ignition/ECU circuits
- Instrument cluster warning lights on or erratic
- Intermittent loss of electrical functions that resolve when wiring is moved
What to check
- Read freeze frame / live data and confirm B1358 is current or stored
- Visual inspection of ignition switch, steering column harness, and connectors for damage, corrosion or water
- Check related fuses and fusible links for blown condition
- Measure voltage at ignition switch RUN terminal with key OFF, ACCESSORY, RUN and START
- Perform continuity check between RUN terminal and chassis ground (look for low resistance indicating a short)
- Disconnect aftermarket accessories or alarm/immobiliser wiring from RUN circuit and re-test
Signal parameters
- RUN terminal voltage: ~12 V (battery voltage) with key in RUN/ON; ~0 V when key OFF
- Expected continuity to ground: open/high resistance when circuit is healthy; near 0 Ω indicates direct short to ground
- Typical signal current: very low for the feed to inputs (milliamps); sustained high current indicates a short
- Fuse condition: fuse supplying RUN should be intact unless short has blown it
Diagnostic algorithm
- Record the code, freeze frame and any related codes. Note key position when fault occurred.
- Visually inspect ignition switch and wiring in steering column for damage, signs of overheating, corrosion or water entry.
- With ignition OFF, disconnect the battery negative terminal before doing major repairs. For live tests proceed with caution.
- Check fuses protecting the RUN circuit. Replace any blown fuses and attempt to reproduce the fault to see if fuse blows again.
- With a DMM, measure voltage at the ignition switch RUN terminal while an assistant turns the key to OFF/ACC/RUN. Confirm the terminal shows battery voltage in RUN.
- If RUN terminal is low/grounded, disconnect loads: remove the RUN circuit fuse(s) or disconnect the ECU/BCM connector(s) on that branch and re-check voltage/continuity to locate which branch creates the short.
- Use an ammeter/ clamp meter or amp drop technique to find abnormal current draw on the RUN feed. Pull suspected fuses one at a time to isolate the shorted branch.
- If short is isolated to wiring, repair harness (repair/replace damaged section, secure routing, protect with loom). If short persists with harness disconnected, suspect internal ECU/BCM or ignition switch.
- If ignition switch is suspected, bench-test or swap with a known-good switch. Replace ignition switch if internal short confirmed.
- After repairs, clear the code, re-check for proper RUN voltage and perform road/test drive to verify no recurrence.
Likely causes
- Wiring rubbed through to chassis ground near steering column
- Ignition switch internal contact fault producing a path to ground
- Connector pins corroded or pushed into contact with ground
- Aftermarket device incorrectly wired to RUN line creating a short
- Moisture contamination at a connector in the RUN circuit
Fault status
Status
Ignition switch RUN circuit detected short to ground. ECU/BCM reports RUN input low or overloaded when key is in RUN position. Investigate wiring, connectors, ignition switch and any aftermarket taps.
Repair difficulty: Medium
Diagnostic time: 0.5-3 hours
Similar codes
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Code
B1358
Other
B — Body
Ignition Run Circuit Short To Ground
Views:
UK: 16
EN: 20
RU: 15
AI status
Completed
Completed
100%
Causes
- Damaged wiring harness (chafing, pinched cable) in the ignition RUN circuit
- Corroded or loose connector at ignition switch or ECU
- Failed ignition switch (internal short)
- Shorted aftermarket accessory or alarm/immobiliser wiring tapped into RUN circuit
- Water ingress or corrosion in steering column/connector
- Shorted input or driver inside a control module (ECU/BCM)
Symptoms
- No power to accessories or control modules in RUN position
- Engine cranks but does not start, or engine stalls when key is turned to RUN
- Blown fuses related to ignition/ECU circuits
- Instrument cluster warning lights on or erratic
- Intermittent loss of electrical functions that resolve when wiring is moved
What to check
- Read freeze frame / live data and confirm B1358 is current or stored
- Visual inspection of ignition switch, steering column harness, and connectors for damage, corrosion or water
- Check related fuses and fusible links for blown condition
- Measure voltage at ignition switch RUN terminal with key OFF, ACCESSORY, RUN and START
- Perform continuity check between RUN terminal and chassis ground (look for low resistance indicating a short)
- Disconnect aftermarket accessories or alarm/immobiliser wiring from RUN circuit and re-test
Signal parameters
- RUN terminal voltage: ~12 V (battery voltage) with key in RUN/ON; ~0 V when key OFF
- Expected continuity to ground: open/high resistance when circuit is healthy; near 0 Ω indicates direct short to ground
- Typical signal current: very low for the feed to inputs (milliamps); sustained high current indicates a short
- Fuse condition: fuse supplying RUN should be intact unless short has blown it
Diagnostic algorithm
- Record the code, freeze frame and any related codes. Note key position when fault occurred.
- Visually inspect ignition switch and wiring in steering column for damage, signs of overheating, corrosion or water entry.
- With ignition OFF, disconnect the battery negative terminal before doing major repairs. For live tests proceed with caution.
- Check fuses protecting the RUN circuit. Replace any blown fuses and attempt to reproduce the fault to see if fuse blows again.
- With a DMM, measure voltage at the ignition switch RUN terminal while an assistant turns the key to OFF/ACC/RUN. Confirm the terminal shows battery voltage in RUN.
- If RUN terminal is low/grounded, disconnect loads: remove the RUN circuit fuse(s) or disconnect the ECU/BCM connector(s) on that branch and re-check voltage/continuity to locate which branch creates the short.
- Use an ammeter/ clamp meter or amp drop technique to find abnormal current draw on the RUN feed. Pull suspected fuses one at a time to isolate the shorted branch.
- If short is isolated to wiring, repair harness (repair/replace damaged section, secure routing, protect with loom). If short persists with harness disconnected, suspect internal ECU/BCM or ignition switch.
- If ignition switch is suspected, bench-test or swap with a known-good switch. Replace ignition switch if internal short confirmed.
- After repairs, clear the code, re-check for proper RUN voltage and perform road/test drive to verify no recurrence.
Likely causes
- Wiring rubbed through to chassis ground near steering column
- Ignition switch internal contact fault producing a path to ground
- Connector pins corroded or pushed into contact with ground
- Aftermarket device incorrectly wired to RUN line creating a short
- Moisture contamination at a connector in the RUN circuit
Fault status
Status
Ignition switch RUN circuit detected short to ground. ECU/BCM reports RUN input low or overloaded when key is in RUN position. Investigate wiring, connectors, ignition switch and any aftermarket taps.
Repair difficulty: Medium
Diagnostic time: 0.5-3 hours
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