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Home / DTC / B1D23 — Left rear door lock motor circuit malfunction

B1D23 — Left rear door lock motor circuit malfunction

Detailed page for trouble code B1D23.

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22,491specific
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B1D23

Generic B — Body

Left rear door lock motor circuit malfunction

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

Causes

  • Open or shorted wiring to left rear door lock actuator
  • Corroded or disconnected connector at actuator or door harness
  • Failed door lock motor/actuator (mechanical jam or electrical failure)
  • Bad ground at door or body control module (BCM)
  • Blown fuse or faulty relay in the lock power circuit
  • Body control module or door module output transistor fault

Symptoms

  • Left rear door does not lock or unlock with key fob, interior switch, or auto-lock
  • Grinding or no noise from left rear door when lock command given
  • Intermittent operation of left rear lock
  • Other doors operate normally while left rear fails
  • Possible blown fuse or multiple door functions affected if fuse/relay is shared

What to check

  • Read and record freeze-frame/live-data and stored DTCs from BCM/door module
  • Visually inspect left rear door harness, connector, and actuator for damage/corrosion
  • Check fuses and relays related to door locks
  • Backprobe actuator connector and check for command voltage/pulse while operating lock
  • Measure continuity between actuator connector and BCM connector for opens/shorts
  • Check ground integrity at door and chassis ground points

Signal parameters

  • Command voltage: typically 0–12 V depending on vehicle (12 V applied for lock/unlock or H-bridge drive switching to ground)
  • Actuator coil resistance: typically a few ohms up to low tens of ohms (vehicle-specific)
  • Normal actuator current draw: commonly 0.5–5 A during movement; stall current will be higher (consult vehicle spec)
  • Open-circuit: infinite resistance between connector terminals when actuator disconnected
  • Short to battery: near 0 Ω between power feed and battery +
  • Short to ground: near 0 Ω between power feed and chassis ground when inactive

Diagnostic algorithm

  1. Verify DTC: Connect scan tool, record B1D23 and any related codes, note conditions when fault set (ignition state, lock/unlock attempts).
  2. Visual inspection: Check door edge, connector boot, and harness for corrosion, pins pushed out, water entry, or chafing at hinge.
  3. Fuse/relay: Check and replace any blown fuses or suspect relays in the door lock circuit. Re-test operation.
  4. Backprobe while operating: With connector connected, backprobe actuator power and ground leads and operate lock/unlock. Observe voltage or switching pattern.
  5. Apply known-good power: Disconnect actuator and apply 12 V directly to actuator to confirm motor runs and moves lock mechanism. If actuator works, suspect wiring/module.
  6. Resistance and current: Measure resistance of actuator and measure current draw during operation (use clamp meter or inline ammeter). Compare to spec — high resistance or excessive current indicates internal fault or mechanical binding.
  7. Continuity and shorts: With ignition off and battery disconnected if required, check continuity from BCM/door module pin to actuator connector, and check for shorts to ground or battery.
  8. Wiggle test: With connector back in place, wiggle harness through door travel while commanding lock — look for intermittent changes and inspect for broken conductors.
  9. Module outputs: If wiring and actuator are good, verify BCM/door module output with scope or multimeter for correct switching/pulse. Consider module replacement only after wiring and actuator verified.
  10. Repair and verify: Repair or replace damaged wiring, connector, actuator, fuse, or module as indicated. Clear codes and cycle lock commands to confirm repair and ensure code does not return.

Likely causes

  • Corroded connector or damaged wiring in door harness (most common)
  • Failed actuator motor (stalls or draws abnormal current)
  • Bad ground at door or BCM
  • Blown fuse or weak relay
  • Faulty door control module / BCM output (least common)

Fault status

⚠️ Status
Left rear door lock motor circuit malfunction — open/short/low power/poor ground or actuator failure detected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

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Code

B1D23

LAND ROVER B — Body

Overheating Sensor Circuit

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

Causes

  • Open or shorted wiring to left rear door lock actuator
  • Corroded or disconnected connector at actuator or door harness
  • Failed door lock motor/actuator (mechanical jam or electrical failure)
  • Bad ground at door or body control module (BCM)
  • Blown fuse or faulty relay in the lock power circuit
  • Body control module or door module output transistor fault

Symptoms

  • Left rear door does not lock or unlock with key fob, interior switch, or auto-lock
  • Grinding or no noise from left rear door when lock command given
  • Intermittent operation of left rear lock
  • Other doors operate normally while left rear fails
  • Possible blown fuse or multiple door functions affected if fuse/relay is shared

What to check

  • Read and record freeze-frame/live-data and stored DTCs from BCM/door module
  • Visually inspect left rear door harness, connector, and actuator for damage/corrosion
  • Check fuses and relays related to door locks
  • Backprobe actuator connector and check for command voltage/pulse while operating lock
  • Measure continuity between actuator connector and BCM connector for opens/shorts
  • Check ground integrity at door and chassis ground points

Signal parameters

  • Command voltage: typically 0–12 V depending on vehicle (12 V applied for lock/unlock or H-bridge drive switching to ground)
  • Actuator coil resistance: typically a few ohms up to low tens of ohms (vehicle-specific)
  • Normal actuator current draw: commonly 0.5–5 A during movement; stall current will be higher (consult vehicle spec)
  • Open-circuit: infinite resistance between connector terminals when actuator disconnected
  • Short to battery: near 0 Ω between power feed and battery +
  • Short to ground: near 0 Ω between power feed and chassis ground when inactive

Diagnostic algorithm

  1. Verify DTC: Connect scan tool, record B1D23 and any related codes, note conditions when fault set (ignition state, lock/unlock attempts).
  2. Visual inspection: Check door edge, connector boot, and harness for corrosion, pins pushed out, water entry, or chafing at hinge.
  3. Fuse/relay: Check and replace any blown fuses or suspect relays in the door lock circuit. Re-test operation.
  4. Backprobe while operating: With connector connected, backprobe actuator power and ground leads and operate lock/unlock. Observe voltage or switching pattern.
  5. Apply known-good power: Disconnect actuator and apply 12 V directly to actuator to confirm motor runs and moves lock mechanism. If actuator works, suspect wiring/module.
  6. Resistance and current: Measure resistance of actuator and measure current draw during operation (use clamp meter or inline ammeter). Compare to spec — high resistance or excessive current indicates internal fault or mechanical binding.
  7. Continuity and shorts: With ignition off and battery disconnected if required, check continuity from BCM/door module pin to actuator connector, and check for shorts to ground or battery.
  8. Wiggle test: With connector back in place, wiggle harness through door travel while commanding lock — look for intermittent changes and inspect for broken conductors.
  9. Module outputs: If wiring and actuator are good, verify BCM/door module output with scope or multimeter for correct switching/pulse. Consider module replacement only after wiring and actuator verified.
  10. Repair and verify: Repair or replace damaged wiring, connector, actuator, fuse, or module as indicated. Clear codes and cycle lock commands to confirm repair and ensure code does not return.

Likely causes

  • Corroded connector or damaged wiring in door harness (most common)
  • Failed actuator motor (stalls or draws abnormal current)
  • Bad ground at door or BCM
  • Blown fuse or weak relay
  • Faulty door control module / BCM output (least common)

Fault status

⚠️ Status
Left rear door lock motor circuit malfunction — open/short/low power/poor ground or actuator failure detected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

B1D22 B1D24 B1D13 B1D33 U0121 U0415
320

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