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Home / DTC / B1591 — Mirror Vert. Pos Sensor-Out of Range/Open

B1591 — Mirror Vert. Pos Sensor-Out of Range/Open

Detailed page for trouble code B1591.

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22,491specific
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Code

B1591

HUMMER B — Body

Mirror Vert. Pos Sensor-Out of Range/Open

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

Causes

  • Open circuit or high resistance in the mirror vertical position sensor wiring
  • Short to voltage or short to ground in the sensor signal or supply circuit
  • Corroded or loose connector at the mirror or door harness
  • Failed vertical position sensor (potentiometer/encoder) inside the mirror assembly
  • Failed mirror motor or internal mechanical binding affecting the sensor
  • Water intrusion or physical damage to the mirror assembly

Symptoms

  • Mirror will not move up/down or moves erratically
  • Mirror position memory does not store or recall vertical position correctly
  • Intermittent loss of vertical adjustment function
  • Possible diagnostic trouble code stored; no drivability effects

What to check

  • Verify DTC B1591 is stored and note freeze frame/occurrence count
  • Attempt mirror vertical adjustment while listening for motor and observing movement
  • Visually inspect mirror housing, connector, and door jamb harness for damage, corrosion or water ingress
  • Wiggle test connectors and harness while operating mirror to reproduce issue
  • Check for other related DTCs (mirror, door module, BCM, communication errors)

Signal parameters

  • Sensor type: typically a 3‑wire position potentiometer or encoder inside mirror
  • Reference/supply: ignition-switched 12 V to motor and 5 V reference to sensor logic (verify with vehicle spec)
  • Signal output: variable voltage proportional to mirror angle — expected to change smoothly while moving (typical 0.1–4.9 V for a potentiometer signal)
  • Ground: solid chassis ground at mirror connector
  • Continuity: low resistance between BCM connector and mirror connector (no open circuits)

Diagnostic algorithm

  1. Retrieve and record all related DTCs and freeze-frame data. Verify B1591 is current or historical.
  2. Confirm symptom: attempt vertical mirror movement and observe behavior. Note any noise, binding, or lack of movement.
  3. Visually inspect the mirror assembly, connector and door hinge area for damage, corrosion, water entry, or crushed wiring.
  4. Perform wiggle test: with ignition on and mirror control operated, gently move the door harness and connector to see if the DTC or symptom can be reproduced.
  5. Backprobe mirror connector with a multimeter: verify supply voltage (12 V as required), reference voltage (5 V if present), ground continuity, and that the position signal varies when mirror is moved. Record values and compare to expected ranges.
  6. If signal is open or out of range at the mirror connector, isolate wiring: check continuity to the BCM/door module connector. Repair any open/short in harness (pay attention to flex point at door hinge).
  7. If wiring and connectors are good but signal does not change or is out of range, suspect internal mirror position sensor failure. Remove mirror glass/cover per service manual and inspect or replace mirror assembly as required.
  8. If wiring and mirror appear good, check BCM/door module input for proper operation or intermittent faults. Verify software/param updates per manufacturer service bulletins.
  9. After repairs, clear codes and perform mirror full travel and memory learn/calibration procedure (if required). Re-scan to confirm no return of B1591.
  10. If fault persists after replacing mirror assembly, perform component-level testing or consult vehicle-specific wiring diagrams and manufacturer technical service information.

Likely causes

  • Corroded/loose connector at mirror causing intermittent/open signal
  • Failed vertical position sensor inside the mirror assembly
  • Broken/shorted wiring in door harness near hinge (flex area)
  • Water intrusion into mirror housing causing sensor failure

Fault status

⚠️ Status
Mirror vertical position sensor circuit open or out of range. Vertical mirror adjustment or memory may not function correctly.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.0 hours

Similar codes

B1590 B1592 B1350 B1320
Repair manuals

Manual library for HUMMER

138

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Code

B1591

MITSUBISHI B — Body

B/UP capacitor capacitance small

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

Causes

  • Open circuit or high resistance in the mirror vertical position sensor wiring
  • Short to voltage or short to ground in the sensor signal or supply circuit
  • Corroded or loose connector at the mirror or door harness
  • Failed vertical position sensor (potentiometer/encoder) inside the mirror assembly
  • Failed mirror motor or internal mechanical binding affecting the sensor
  • Water intrusion or physical damage to the mirror assembly

Symptoms

  • Mirror will not move up/down or moves erratically
  • Mirror position memory does not store or recall vertical position correctly
  • Intermittent loss of vertical adjustment function
  • Possible diagnostic trouble code stored; no drivability effects

What to check

  • Verify DTC B1591 is stored and note freeze frame/occurrence count
  • Attempt mirror vertical adjustment while listening for motor and observing movement
  • Visually inspect mirror housing, connector, and door jamb harness for damage, corrosion or water ingress
  • Wiggle test connectors and harness while operating mirror to reproduce issue
  • Check for other related DTCs (mirror, door module, BCM, communication errors)

Signal parameters

  • Sensor type: typically a 3‑wire position potentiometer or encoder inside mirror
  • Reference/supply: ignition-switched 12 V to motor and 5 V reference to sensor logic (verify with vehicle spec)
  • Signal output: variable voltage proportional to mirror angle — expected to change smoothly while moving (typical 0.1–4.9 V for a potentiometer signal)
  • Ground: solid chassis ground at mirror connector
  • Continuity: low resistance between BCM connector and mirror connector (no open circuits)

Diagnostic algorithm

  1. Retrieve and record all related DTCs and freeze-frame data. Verify B1591 is current or historical.
  2. Confirm symptom: attempt vertical mirror movement and observe behavior. Note any noise, binding, or lack of movement.
  3. Visually inspect the mirror assembly, connector and door hinge area for damage, corrosion, water entry, or crushed wiring.
  4. Perform wiggle test: with ignition on and mirror control operated, gently move the door harness and connector to see if the DTC or symptom can be reproduced.
  5. Backprobe mirror connector with a multimeter: verify supply voltage (12 V as required), reference voltage (5 V if present), ground continuity, and that the position signal varies when mirror is moved. Record values and compare to expected ranges.
  6. If signal is open or out of range at the mirror connector, isolate wiring: check continuity to the BCM/door module connector. Repair any open/short in harness (pay attention to flex point at door hinge).
  7. If wiring and connectors are good but signal does not change or is out of range, suspect internal mirror position sensor failure. Remove mirror glass/cover per service manual and inspect or replace mirror assembly as required.
  8. If wiring and mirror appear good, check BCM/door module input for proper operation or intermittent faults. Verify software/param updates per manufacturer service bulletins.
  9. After repairs, clear codes and perform mirror full travel and memory learn/calibration procedure (if required). Re-scan to confirm no return of B1591.
  10. If fault persists after replacing mirror assembly, perform component-level testing or consult vehicle-specific wiring diagrams and manufacturer technical service information.

Likely causes

  • Corroded/loose connector at mirror causing intermittent/open signal
  • Failed vertical position sensor inside the mirror assembly
  • Broken/shorted wiring in door harness near hinge (flex area)
  • Water intrusion into mirror housing causing sensor failure

Fault status

⚠️ Status
Mirror vertical position sensor circuit open or out of range. Vertical mirror adjustment or memory may not function correctly.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.0 hours

Similar codes

B1590 B1592 B1350 B1320
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MITSUBISHI

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Code

B1591

Other B — Body

Autolamp Delay Decrease Circuit Failure

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

Causes

  • Open circuit or high resistance in the mirror vertical position sensor wiring
  • Short to voltage or short to ground in the sensor signal or supply circuit
  • Corroded or loose connector at the mirror or door harness
  • Failed vertical position sensor (potentiometer/encoder) inside the mirror assembly
  • Failed mirror motor or internal mechanical binding affecting the sensor
  • Water intrusion or physical damage to the mirror assembly

Symptoms

  • Mirror will not move up/down or moves erratically
  • Mirror position memory does not store or recall vertical position correctly
  • Intermittent loss of vertical adjustment function
  • Possible diagnostic trouble code stored; no drivability effects

What to check

  • Verify DTC B1591 is stored and note freeze frame/occurrence count
  • Attempt mirror vertical adjustment while listening for motor and observing movement
  • Visually inspect mirror housing, connector, and door jamb harness for damage, corrosion or water ingress
  • Wiggle test connectors and harness while operating mirror to reproduce issue
  • Check for other related DTCs (mirror, door module, BCM, communication errors)

Signal parameters

  • Sensor type: typically a 3‑wire position potentiometer or encoder inside mirror
  • Reference/supply: ignition-switched 12 V to motor and 5 V reference to sensor logic (verify with vehicle spec)
  • Signal output: variable voltage proportional to mirror angle — expected to change smoothly while moving (typical 0.1–4.9 V for a potentiometer signal)
  • Ground: solid chassis ground at mirror connector
  • Continuity: low resistance between BCM connector and mirror connector (no open circuits)

Diagnostic algorithm

  1. Retrieve and record all related DTCs and freeze-frame data. Verify B1591 is current or historical.
  2. Confirm symptom: attempt vertical mirror movement and observe behavior. Note any noise, binding, or lack of movement.
  3. Visually inspect the mirror assembly, connector and door hinge area for damage, corrosion, water entry, or crushed wiring.
  4. Perform wiggle test: with ignition on and mirror control operated, gently move the door harness and connector to see if the DTC or symptom can be reproduced.
  5. Backprobe mirror connector with a multimeter: verify supply voltage (12 V as required), reference voltage (5 V if present), ground continuity, and that the position signal varies when mirror is moved. Record values and compare to expected ranges.
  6. If signal is open or out of range at the mirror connector, isolate wiring: check continuity to the BCM/door module connector. Repair any open/short in harness (pay attention to flex point at door hinge).
  7. If wiring and connectors are good but signal does not change or is out of range, suspect internal mirror position sensor failure. Remove mirror glass/cover per service manual and inspect or replace mirror assembly as required.
  8. If wiring and mirror appear good, check BCM/door module input for proper operation or intermittent faults. Verify software/param updates per manufacturer service bulletins.
  9. After repairs, clear codes and perform mirror full travel and memory learn/calibration procedure (if required). Re-scan to confirm no return of B1591.
  10. If fault persists after replacing mirror assembly, perform component-level testing or consult vehicle-specific wiring diagrams and manufacturer technical service information.

Likely causes

  • Corroded/loose connector at mirror causing intermittent/open signal
  • Failed vertical position sensor inside the mirror assembly
  • Broken/shorted wiring in door harness near hinge (flex area)
  • Water intrusion into mirror housing causing sensor failure

Fault status

⚠️ Status
Mirror vertical position sensor circuit open or out of range. Vertical mirror adjustment or memory may not function correctly.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.0 hours

Similar codes

B1590 B1592 B1350 B1320
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