Code
B1362
ALFA ROMEO
B — Body
Ignition switch RUN/ACC short to ground
Views:
UK: 6
EN: 6
RU: 4
AI status
Completed
Completed
100%
Causes
- Damaged wiring harness or chafed insulation contacting chassis ground (commonly at steering column or bulkhead)
- Corroded or damaged connector pins at ignition switch or fuse/relay box
- Internal failure inside the ignition switch assembly
- Aftermarket alarm/immobilizer or accessory wiring incorrectly installed and shorted
- Water intrusion or corrosion in connectors
- Blown or incorrect fuse or relay causing abnormal circuit behavior
Symptoms
- No or intermittent power to ACC and RUN circuits (radio, dash cluster, fuel pump/ignition control symptoms depending on vehicle)
- Related fuses blowing immediately when key turned to ACC/RUN
- Vehicle may not crank or start if ignition power feeds are affected
- Accessory functions work intermittently or not at all
- Possible battery drain or parasitic draw if short is present when key is off
What to check
- Retrieve freeze-frame/related data with a scan tool and confirm B1362 is current or stored
- Visually inspect ignition switch connector, wiring harness, steering column area, and chassis grounds for damage or corrosion
- Check relevant fuses and relays for open/blown condition and proper rating
- Measure voltage at ignition switch RUN/ACC terminal with key OFF, ACC and RUN positions (use proper safety practices)
- Perform a continuity check from RUN/ACC circuit to chassis ground with connectors in place and then disconnected to isolate the short
- Disconnect aftermarket accessories/alarms and test system behavior
Signal parameters
- Expected voltage at RUN/ACC terminal with key OFF: ~0 V (no battery voltage present)
- Expected voltage at RUN/ACC terminal with key ACC or RUN: battery voltage (~11.5–14.5 V)
- If RUN/ACC wire has
- No continuity (open or very high resistance) to ground expected on RUN/ACC circuit when ignition is in OFF/RUN/ACC except through intended loads
Diagnostic algorithm
- Read and record DTCs and freeze-frame. Confirm B1362 is present and note any related codes.
- Inspect visible wiring, connectors, and grounds for damage, rubbing, corrosion, or rodent damage—pay attention to steering column, bulkhead grommets and fuse box areas.
- Check fuses and relays for the RUN/ACC circuits. Replace any blown fuses with the correct rating only after finding the cause of the short.
- With vehicle secure and following safety procedures, measure voltage at the ignition switch RUN/ACC terminal in OFF, ACC and RUN positions. Verify expected behavior (≈0 V OFF, ≈battery voltage ACC/RUN).
- If RUN/ACC voltage is low or absent due to a short, disconnect the ignition switch connector. With key in ACC/RUN, check continuity/voltage from the harness side RUN/ACC conductor to chassis ground. If continuity to ground is present on the harness side, the short is downstream—inspect harness and fused circuits; if not present, suspect ignition switch.
- Isolate circuits by unplugging downstream connectors (fuse box, BCM, accessory modules) one at a time while monitoring the RUN/ACC conductor to locate the shorted branch.
- If no obvious harness fault and tests point to the switch, remove/replace the ignition switch (or its connector) and re-test. Use a known-good replacement if possible.
- After repair, clear codes, verify correct voltages and function in all key positions, and perform a road test to confirm the fault does not return.
- Safety note: remove battery negative terminal when performing repairs on wiring and connectors. When making live voltage tests, take appropriate precautions to avoid shorts and personal injury.
Likely causes
- Chafed/abraded wire at steering column or nearby wiring bundle
- Faulty ignition switch internal contacts
- Corroded/loose connector at ignition switch or body control module
- Aftermarket device tied into ACC/RUN circuit creating a short
Fault status
Status
Ignition switch RUN/ACC circuit short to ground — RUN/ACC terminal is being shorted to chassis ground, preventing normal voltage supply to accessory/ignition circuits.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
B1362
FIAT
B — Body
Ignition switch RUN/ACC short to ground
Views:
UK: 6
EN: 6
RU: 4
AI status
Completed
Completed
100%
Causes
- Damaged wiring harness or chafed insulation contacting chassis ground (commonly at steering column or bulkhead)
- Corroded or damaged connector pins at ignition switch or fuse/relay box
- Internal failure inside the ignition switch assembly
- Aftermarket alarm/immobilizer or accessory wiring incorrectly installed and shorted
- Water intrusion or corrosion in connectors
- Blown or incorrect fuse or relay causing abnormal circuit behavior
Symptoms
- No or intermittent power to ACC and RUN circuits (radio, dash cluster, fuel pump/ignition control symptoms depending on vehicle)
- Related fuses blowing immediately when key turned to ACC/RUN
- Vehicle may not crank or start if ignition power feeds are affected
- Accessory functions work intermittently or not at all
- Possible battery drain or parasitic draw if short is present when key is off
What to check
- Retrieve freeze-frame/related data with a scan tool and confirm B1362 is current or stored
- Visually inspect ignition switch connector, wiring harness, steering column area, and chassis grounds for damage or corrosion
- Check relevant fuses and relays for open/blown condition and proper rating
- Measure voltage at ignition switch RUN/ACC terminal with key OFF, ACC and RUN positions (use proper safety practices)
- Perform a continuity check from RUN/ACC circuit to chassis ground with connectors in place and then disconnected to isolate the short
- Disconnect aftermarket accessories/alarms and test system behavior
Signal parameters
- Expected voltage at RUN/ACC terminal with key OFF: ~0 V (no battery voltage present)
- Expected voltage at RUN/ACC terminal with key ACC or RUN: battery voltage (~11.5–14.5 V)
- If RUN/ACC wire has
- No continuity (open or very high resistance) to ground expected on RUN/ACC circuit when ignition is in OFF/RUN/ACC except through intended loads
Diagnostic algorithm
- Read and record DTCs and freeze-frame. Confirm B1362 is present and note any related codes.
- Inspect visible wiring, connectors, and grounds for damage, rubbing, corrosion, or rodent damage—pay attention to steering column, bulkhead grommets and fuse box areas.
- Check fuses and relays for the RUN/ACC circuits. Replace any blown fuses with the correct rating only after finding the cause of the short.
- With vehicle secure and following safety procedures, measure voltage at the ignition switch RUN/ACC terminal in OFF, ACC and RUN positions. Verify expected behavior (≈0 V OFF, ≈battery voltage ACC/RUN).
- If RUN/ACC voltage is low or absent due to a short, disconnect the ignition switch connector. With key in ACC/RUN, check continuity/voltage from the harness side RUN/ACC conductor to chassis ground. If continuity to ground is present on the harness side, the short is downstream—inspect harness and fused circuits; if not present, suspect ignition switch.
- Isolate circuits by unplugging downstream connectors (fuse box, BCM, accessory modules) one at a time while monitoring the RUN/ACC conductor to locate the shorted branch.
- If no obvious harness fault and tests point to the switch, remove/replace the ignition switch (or its connector) and re-test. Use a known-good replacement if possible.
- After repair, clear codes, verify correct voltages and function in all key positions, and perform a road test to confirm the fault does not return.
- Safety note: remove battery negative terminal when performing repairs on wiring and connectors. When making live voltage tests, take appropriate precautions to avoid shorts and personal injury.
Likely causes
- Chafed/abraded wire at steering column or nearby wiring bundle
- Faulty ignition switch internal contacts
- Corroded/loose connector at ignition switch or body control module
- Aftermarket device tied into ACC/RUN circuit creating a short
Fault status
Status
Ignition switch RUN/ACC circuit short to ground — RUN/ACC terminal is being shorted to chassis ground, preventing normal voltage supply to accessory/ignition circuits.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
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Code
B1362
Other
B — Body
Ignition Run/Acc Circuit Short To Ground
Views:
UK: 12
EN: 15
RU: 18
AI status
Completed
Completed
100%
Causes
- Damaged wiring harness or chafed insulation contacting chassis ground (commonly at steering column or bulkhead)
- Corroded or damaged connector pins at ignition switch or fuse/relay box
- Internal failure inside the ignition switch assembly
- Aftermarket alarm/immobilizer or accessory wiring incorrectly installed and shorted
- Water intrusion or corrosion in connectors
- Blown or incorrect fuse or relay causing abnormal circuit behavior
Symptoms
- No or intermittent power to ACC and RUN circuits (radio, dash cluster, fuel pump/ignition control symptoms depending on vehicle)
- Related fuses blowing immediately when key turned to ACC/RUN
- Vehicle may not crank or start if ignition power feeds are affected
- Accessory functions work intermittently or not at all
- Possible battery drain or parasitic draw if short is present when key is off
What to check
- Retrieve freeze-frame/related data with a scan tool and confirm B1362 is current or stored
- Visually inspect ignition switch connector, wiring harness, steering column area, and chassis grounds for damage or corrosion
- Check relevant fuses and relays for open/blown condition and proper rating
- Measure voltage at ignition switch RUN/ACC terminal with key OFF, ACC and RUN positions (use proper safety practices)
- Perform a continuity check from RUN/ACC circuit to chassis ground with connectors in place and then disconnected to isolate the short
- Disconnect aftermarket accessories/alarms and test system behavior
Signal parameters
- Expected voltage at RUN/ACC terminal with key OFF: ~0 V (no battery voltage present)
- Expected voltage at RUN/ACC terminal with key ACC or RUN: battery voltage (~11.5–14.5 V)
- If RUN/ACC wire has
- No continuity (open or very high resistance) to ground expected on RUN/ACC circuit when ignition is in OFF/RUN/ACC except through intended loads
Diagnostic algorithm
- Read and record DTCs and freeze-frame. Confirm B1362 is present and note any related codes.
- Inspect visible wiring, connectors, and grounds for damage, rubbing, corrosion, or rodent damage—pay attention to steering column, bulkhead grommets and fuse box areas.
- Check fuses and relays for the RUN/ACC circuits. Replace any blown fuses with the correct rating only after finding the cause of the short.
- With vehicle secure and following safety procedures, measure voltage at the ignition switch RUN/ACC terminal in OFF, ACC and RUN positions. Verify expected behavior (≈0 V OFF, ≈battery voltage ACC/RUN).
- If RUN/ACC voltage is low or absent due to a short, disconnect the ignition switch connector. With key in ACC/RUN, check continuity/voltage from the harness side RUN/ACC conductor to chassis ground. If continuity to ground is present on the harness side, the short is downstream—inspect harness and fused circuits; if not present, suspect ignition switch.
- Isolate circuits by unplugging downstream connectors (fuse box, BCM, accessory modules) one at a time while monitoring the RUN/ACC conductor to locate the shorted branch.
- If no obvious harness fault and tests point to the switch, remove/replace the ignition switch (or its connector) and re-test. Use a known-good replacement if possible.
- After repair, clear codes, verify correct voltages and function in all key positions, and perform a road test to confirm the fault does not return.
- Safety note: remove battery negative terminal when performing repairs on wiring and connectors. When making live voltage tests, take appropriate precautions to avoid shorts and personal injury.
Likely causes
- Chafed/abraded wire at steering column or nearby wiring bundle
- Faulty ignition switch internal contacts
- Corroded/loose connector at ignition switch or body control module
- Aftermarket device tied into ACC/RUN circuit creating a short
Fault status
Status
Ignition switch RUN/ACC circuit short to ground — RUN/ACC terminal is being shorted to chassis ground, preventing normal voltage supply to accessory/ignition circuits.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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