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Home / DTC / B1372 — Entry illumination relay open circuit

B1372 — Entry illumination relay open circuit

Detailed page for trouble code B1372.

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Code

B1372

ALFA ROMEO B — Body

Entry illumination relay open circuit

Brand: ALFA ROMEO
Type: B — Body
Views: UK: 4 EN: 6 RU: 5
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse powering the relay or lighting circuit
  • Faulty or stuck open entry illumination relay
  • Open or damaged wiring/harness between BCM and relay coil
  • Poor connector contact or corrosion at relay socket or ground
  • Faulty BCM or relay driver output

Symptoms

  • Entry/footwell/door courtesy lamps do not illuminate when doors open
  • Interior lighting only works intermittently or not at all
  • Related door/entry lighting functions may be inoperative
  • Possible stored additional body electrical fault codes

What to check

  • Verify the code with a compatible scan tool and check freeze-frame / occurrence count
  • Check fuses related to interior lighting and relay power
  • Visually inspect relay, relay socket, and related connectors for corrosion or damage
  • Measure for 12 V supply at relay power terminal with ignition on
  • Check continuity/resistance of relay coil circuit between BCM and relay
  • Confirm BCM output command when lamps should be on (use scope or DVOM for pulse/voltage)

Signal parameters

  • Relay supply voltage (terminal 30): ~12 V with ignition on
  • Relay coil resistance: typically 50–200 ohms (varies by relay type) — coil should not be infinite
  • Control/driver command voltage from BCM: 0 V (off) and approx. 12 V or switched ground when activated (depending on system design)
  • Switched output to lamps: ~12 V when relay is energized
  • Open-circuit indication: continuity infinite / very high resistance in coil or control circuit

Diagnostic algorithm

  1. Retrieve the fault code(s) and any related body/network codes with a scan tool; note conditions when code set.
  2. Visually inspect the relay, relay socket, wiring harness, connectors, and associated fuses for obvious damage or corrosion.
  3. With ignition off, remove the entry illumination relay and check coil resistance across the relay coil terminals. Replace relay if coil is open (infinite resistance).
  4. Check for 12 V at the relay supply terminal with ignition on. If no supply, trace and repair fuse or supply wiring.
  5. Reinstall relay and back-probe the control terminal. Command the BCM to turn on the entry lights (use scan tool) and observe control voltage/ground and switched output to lamps.
  6. If BCM is commanding but relay does not energize and supply is present, check relay socket continuity and ground. Repair wiring or replace relay.
  7. If relay/relays and wiring are good but no command from BCM, inspect BCM connector pins and grounds. Check for related network faults; consider BCM programming or replacement only after wiring verified.
  8. Clear codes and verify repair by cycling door/opening and closing to confirm lamps operate and code does not return.

Likely causes

  • Relay coil open (internal relay failure)
  • Broken wire, chafed harness, or pinched connector in relay control circuit
  • Blown fuse upstream of relay supply
  • Corroded terminals at relay socket or ground point
  • BCM driver transistor fault or software/firmware issue

Fault status

⚠️ Status
Entry illumination relay open circuit detected. Circuit continuity interrupted between BCM and relay or relay coil open; entry lighting may not function.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1371 B1373 B1380 U0121
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Code

B1372

FIAT B — Body

Entry illumination relay open circuit

Brand: FIAT
Type: B — Body
Views: UK: 4 EN: 7 RU: 5
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse powering the relay or lighting circuit
  • Faulty or stuck open entry illumination relay
  • Open or damaged wiring/harness between BCM and relay coil
  • Poor connector contact or corrosion at relay socket or ground
  • Faulty BCM or relay driver output

Symptoms

  • Entry/footwell/door courtesy lamps do not illuminate when doors open
  • Interior lighting only works intermittently or not at all
  • Related door/entry lighting functions may be inoperative
  • Possible stored additional body electrical fault codes

What to check

  • Verify the code with a compatible scan tool and check freeze-frame / occurrence count
  • Check fuses related to interior lighting and relay power
  • Visually inspect relay, relay socket, and related connectors for corrosion or damage
  • Measure for 12 V supply at relay power terminal with ignition on
  • Check continuity/resistance of relay coil circuit between BCM and relay
  • Confirm BCM output command when lamps should be on (use scope or DVOM for pulse/voltage)

Signal parameters

  • Relay supply voltage (terminal 30): ~12 V with ignition on
  • Relay coil resistance: typically 50–200 ohms (varies by relay type) — coil should not be infinite
  • Control/driver command voltage from BCM: 0 V (off) and approx. 12 V or switched ground when activated (depending on system design)
  • Switched output to lamps: ~12 V when relay is energized
  • Open-circuit indication: continuity infinite / very high resistance in coil or control circuit

Diagnostic algorithm

  1. Retrieve the fault code(s) and any related body/network codes with a scan tool; note conditions when code set.
  2. Visually inspect the relay, relay socket, wiring harness, connectors, and associated fuses for obvious damage or corrosion.
  3. With ignition off, remove the entry illumination relay and check coil resistance across the relay coil terminals. Replace relay if coil is open (infinite resistance).
  4. Check for 12 V at the relay supply terminal with ignition on. If no supply, trace and repair fuse or supply wiring.
  5. Reinstall relay and back-probe the control terminal. Command the BCM to turn on the entry lights (use scan tool) and observe control voltage/ground and switched output to lamps.
  6. If BCM is commanding but relay does not energize and supply is present, check relay socket continuity and ground. Repair wiring or replace relay.
  7. If relay/relays and wiring are good but no command from BCM, inspect BCM connector pins and grounds. Check for related network faults; consider BCM programming or replacement only after wiring verified.
  8. Clear codes and verify repair by cycling door/opening and closing to confirm lamps operate and code does not return.

Likely causes

  • Relay coil open (internal relay failure)
  • Broken wire, chafed harness, or pinched connector in relay control circuit
  • Blown fuse upstream of relay supply
  • Corroded terminals at relay socket or ground point
  • BCM driver transistor fault or software/firmware issue

Fault status

⚠️ Status
Entry illumination relay open circuit detected. Circuit continuity interrupted between BCM and relay or relay coil open; entry lighting may not function.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1371 B1373 B1380 U0121
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Code

B1372

HUMMER B — Body

Device Ignition 1 Circuit Low

Brand: HUMMER
Type: B — Body
Views: UK: 4 EN: 10 RU: 8
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse powering the relay or lighting circuit
  • Faulty or stuck open entry illumination relay
  • Open or damaged wiring/harness between BCM and relay coil
  • Poor connector contact or corrosion at relay socket or ground
  • Faulty BCM or relay driver output

Symptoms

  • Entry/footwell/door courtesy lamps do not illuminate when doors open
  • Interior lighting only works intermittently or not at all
  • Related door/entry lighting functions may be inoperative
  • Possible stored additional body electrical fault codes

What to check

  • Verify the code with a compatible scan tool and check freeze-frame / occurrence count
  • Check fuses related to interior lighting and relay power
  • Visually inspect relay, relay socket, and related connectors for corrosion or damage
  • Measure for 12 V supply at relay power terminal with ignition on
  • Check continuity/resistance of relay coil circuit between BCM and relay
  • Confirm BCM output command when lamps should be on (use scope or DVOM for pulse/voltage)

Signal parameters

  • Relay supply voltage (terminal 30): ~12 V with ignition on
  • Relay coil resistance: typically 50–200 ohms (varies by relay type) — coil should not be infinite
  • Control/driver command voltage from BCM: 0 V (off) and approx. 12 V or switched ground when activated (depending on system design)
  • Switched output to lamps: ~12 V when relay is energized
  • Open-circuit indication: continuity infinite / very high resistance in coil or control circuit

Diagnostic algorithm

  1. Retrieve the fault code(s) and any related body/network codes with a scan tool; note conditions when code set.
  2. Visually inspect the relay, relay socket, wiring harness, connectors, and associated fuses for obvious damage or corrosion.
  3. With ignition off, remove the entry illumination relay and check coil resistance across the relay coil terminals. Replace relay if coil is open (infinite resistance).
  4. Check for 12 V at the relay supply terminal with ignition on. If no supply, trace and repair fuse or supply wiring.
  5. Reinstall relay and back-probe the control terminal. Command the BCM to turn on the entry lights (use scan tool) and observe control voltage/ground and switched output to lamps.
  6. If BCM is commanding but relay does not energize and supply is present, check relay socket continuity and ground. Repair wiring or replace relay.
  7. If relay/relays and wiring are good but no command from BCM, inspect BCM connector pins and grounds. Check for related network faults; consider BCM programming or replacement only after wiring verified.
  8. Clear codes and verify repair by cycling door/opening and closing to confirm lamps operate and code does not return.

Likely causes

  • Relay coil open (internal relay failure)
  • Broken wire, chafed harness, or pinched connector in relay control circuit
  • Blown fuse upstream of relay supply
  • Corroded terminals at relay socket or ground point
  • BCM driver transistor fault or software/firmware issue

Fault status

⚠️ Status
Entry illumination relay open circuit detected. Circuit continuity interrupted between BCM and relay or relay coil open; entry lighting may not function.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1371 B1373 B1380 U0121
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

B1372

Other B — Body

Illuminated Entry Relay Circuit Open

Brand: Other
Type: B — Body
Views: UK: 12 EN: 24 RU: 15
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse powering the relay or lighting circuit
  • Faulty or stuck open entry illumination relay
  • Open or damaged wiring/harness between BCM and relay coil
  • Poor connector contact or corrosion at relay socket or ground
  • Faulty BCM or relay driver output

Symptoms

  • Entry/footwell/door courtesy lamps do not illuminate when doors open
  • Interior lighting only works intermittently or not at all
  • Related door/entry lighting functions may be inoperative
  • Possible stored additional body electrical fault codes

What to check

  • Verify the code with a compatible scan tool and check freeze-frame / occurrence count
  • Check fuses related to interior lighting and relay power
  • Visually inspect relay, relay socket, and related connectors for corrosion or damage
  • Measure for 12 V supply at relay power terminal with ignition on
  • Check continuity/resistance of relay coil circuit between BCM and relay
  • Confirm BCM output command when lamps should be on (use scope or DVOM for pulse/voltage)

Signal parameters

  • Relay supply voltage (terminal 30): ~12 V with ignition on
  • Relay coil resistance: typically 50–200 ohms (varies by relay type) — coil should not be infinite
  • Control/driver command voltage from BCM: 0 V (off) and approx. 12 V or switched ground when activated (depending on system design)
  • Switched output to lamps: ~12 V when relay is energized
  • Open-circuit indication: continuity infinite / very high resistance in coil or control circuit

Diagnostic algorithm

  1. Retrieve the fault code(s) and any related body/network codes with a scan tool; note conditions when code set.
  2. Visually inspect the relay, relay socket, wiring harness, connectors, and associated fuses for obvious damage or corrosion.
  3. With ignition off, remove the entry illumination relay and check coil resistance across the relay coil terminals. Replace relay if coil is open (infinite resistance).
  4. Check for 12 V at the relay supply terminal with ignition on. If no supply, trace and repair fuse or supply wiring.
  5. Reinstall relay and back-probe the control terminal. Command the BCM to turn on the entry lights (use scan tool) and observe control voltage/ground and switched output to lamps.
  6. If BCM is commanding but relay does not energize and supply is present, check relay socket continuity and ground. Repair wiring or replace relay.
  7. If relay/relays and wiring are good but no command from BCM, inspect BCM connector pins and grounds. Check for related network faults; consider BCM programming or replacement only after wiring verified.
  8. Clear codes and verify repair by cycling door/opening and closing to confirm lamps operate and code does not return.

Likely causes

  • Relay coil open (internal relay failure)
  • Broken wire, chafed harness, or pinched connector in relay control circuit
  • Blown fuse upstream of relay supply
  • Corroded terminals at relay socket or ground point
  • BCM driver transistor fault or software/firmware issue

Fault status

⚠️ Status
Entry illumination relay open circuit detected. Circuit continuity interrupted between BCM and relay or relay coil open; entry lighting may not function.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1371 B1373 B1380 U0121
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