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Home / DTC / B1762 — CD changer focus error

B1762 — CD changer focus error

Detailed page for trouble code B1762.

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22,491specific
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Code

B1762

HUMMER B — Body

CD changer focus error

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

Causes

  • Dirty or contaminated optical lens
  • Failed or weak laser diode (optical pickup)
  • Focus/actuator mechanical binding or worn gears
  • Faulty focus servo electronics on the CD changer PCB
  • Intermittent or poor power supply to the CD changer
  • Damaged wiring, connectors or grounds between head unit and CD changer

Symptoms

  • CD changer displays a focus error or "cannot read" message
  • Unit fails to recognize discs or repeatedly skips during read
  • Audio head unit reports changer fault or shows blank tracks
  • Disc tries to spin but playback does not start or immediately fails
  • Intermittent operation that may improve after tapping or reseating connectors

What to check

  • Retrieve and record any related stored DTCs from the radio/head unit and CD changer (if separately diagnosable).
  • Visually inspect the CD changer and head unit connectors for corrosion, bent pins, or loose fit. Reseat connectors.
  • Check fuses related to the radio/CD changer and verify battery supply and ground at the changer connector with a multimeter.
  • Try multiple known-good discs (audio CDs), including a clean/new disc, to rule out disc damage or format issues.
  • Open the changer (if safe and permitted) to inspect the optical lens for dust, fingerprints, or obstruction.
  • Listen for abnormal mechanical noise from the changer (stiction, grinding) when the unit attempts to focus or load a disc.

Signal parameters

  • Laser diode supply voltage (typical low-voltage supply to pickup)
  • Focus servo drive voltage / PWM control signal
  • Focus error/feedback voltage or voltage swing from pickup (servo feedback)
  • Tracking servo signal
  • Spindle motor supply voltage (drive motor for disc spin)
  • Data/communication line between radio and changer (proprietary serial or LIN/CAN depending on system)

Diagnostic algorithm

  1. Confirm the fault: record the exact message or DTC, then attempt to reproduce the failure with several known-good discs.
  2. Verify basic power and ground: check changer fuse, battery feed and ground at the changer connector; repair any supply faults.
  3. Inspect and reseat harness connectors at the changer and head unit; repair damaged pins or wiring and ensure good grounds.
  4. Visually inspect and, if accessible, clean the optical lens with a suitable, gentle optical lens cleaner or compressed air. Re-test.
  5. Measure supply voltages and signal lines at the changer connector while attempting read (laser supply, spindle motor voltage, communication line activity). Compare to service specifications if available.
  6. If focus feedback signal is absent or out of range, suspect pickup/servo electronics failure; remove changer and bench-test if repair data is available.
  7. Swap components if possible: connect a known-good CD changer or head unit (or known-good wiring) to isolate which module is at fault.
  8. If mechanical binding is suspected, inspect gears and sled movement for wear or obstruction; replace worn mechanical parts or the changer assembly as required.
  9. If laser diode is confirmed failed or intermittent and lens cleaning did not help, replacement of optical pickup or entire CD changer is often required. After repairs, clear codes and verify operation with multiple discs.

Likely causes

  • Contaminated/dusty optical lens
  • Aging/failed laser diode or pickup assembly
  • Loose connector or poor ground at the changer

Fault status

⚠️ Status
CD Changer Focus Error — changer cannot focus on disc; disc playback not available.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

B1760 B1761 B1763 B1764
Repair manuals

Manual library for HUMMER

138

Browse 138 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

HUMMER

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Code

B1762

MITSUBISHI B — Body

IOD fuse not seated fully

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

Causes

  • Dirty or contaminated optical lens
  • Failed or weak laser diode (optical pickup)
  • Focus/actuator mechanical binding or worn gears
  • Faulty focus servo electronics on the CD changer PCB
  • Intermittent or poor power supply to the CD changer
  • Damaged wiring, connectors or grounds between head unit and CD changer

Symptoms

  • CD changer displays a focus error or "cannot read" message
  • Unit fails to recognize discs or repeatedly skips during read
  • Audio head unit reports changer fault or shows blank tracks
  • Disc tries to spin but playback does not start or immediately fails
  • Intermittent operation that may improve after tapping or reseating connectors

What to check

  • Retrieve and record any related stored DTCs from the radio/head unit and CD changer (if separately diagnosable).
  • Visually inspect the CD changer and head unit connectors for corrosion, bent pins, or loose fit. Reseat connectors.
  • Check fuses related to the radio/CD changer and verify battery supply and ground at the changer connector with a multimeter.
  • Try multiple known-good discs (audio CDs), including a clean/new disc, to rule out disc damage or format issues.
  • Open the changer (if safe and permitted) to inspect the optical lens for dust, fingerprints, or obstruction.
  • Listen for abnormal mechanical noise from the changer (stiction, grinding) when the unit attempts to focus or load a disc.

Signal parameters

  • Laser diode supply voltage (typical low-voltage supply to pickup)
  • Focus servo drive voltage / PWM control signal
  • Focus error/feedback voltage or voltage swing from pickup (servo feedback)
  • Tracking servo signal
  • Spindle motor supply voltage (drive motor for disc spin)
  • Data/communication line between radio and changer (proprietary serial or LIN/CAN depending on system)

Diagnostic algorithm

  1. Confirm the fault: record the exact message or DTC, then attempt to reproduce the failure with several known-good discs.
  2. Verify basic power and ground: check changer fuse, battery feed and ground at the changer connector; repair any supply faults.
  3. Inspect and reseat harness connectors at the changer and head unit; repair damaged pins or wiring and ensure good grounds.
  4. Visually inspect and, if accessible, clean the optical lens with a suitable, gentle optical lens cleaner or compressed air. Re-test.
  5. Measure supply voltages and signal lines at the changer connector while attempting read (laser supply, spindle motor voltage, communication line activity). Compare to service specifications if available.
  6. If focus feedback signal is absent or out of range, suspect pickup/servo electronics failure; remove changer and bench-test if repair data is available.
  7. Swap components if possible: connect a known-good CD changer or head unit (or known-good wiring) to isolate which module is at fault.
  8. If mechanical binding is suspected, inspect gears and sled movement for wear or obstruction; replace worn mechanical parts or the changer assembly as required.
  9. If laser diode is confirmed failed or intermittent and lens cleaning did not help, replacement of optical pickup or entire CD changer is often required. After repairs, clear codes and verify operation with multiple discs.

Likely causes

  • Contaminated/dusty optical lens
  • Aging/failed laser diode or pickup assembly
  • Loose connector or poor ground at the changer

Fault status

⚠️ Status
CD Changer Focus Error — changer cannot focus on disc; disc playback not available.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

B1760 B1761 B1763 B1764
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

B1762

Other B — Body

Seat Driver Front Down Circuit Open

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

Causes

  • Dirty or contaminated optical lens
  • Failed or weak laser diode (optical pickup)
  • Focus/actuator mechanical binding or worn gears
  • Faulty focus servo electronics on the CD changer PCB
  • Intermittent or poor power supply to the CD changer
  • Damaged wiring, connectors or grounds between head unit and CD changer

Symptoms

  • CD changer displays a focus error or "cannot read" message
  • Unit fails to recognize discs or repeatedly skips during read
  • Audio head unit reports changer fault or shows blank tracks
  • Disc tries to spin but playback does not start or immediately fails
  • Intermittent operation that may improve after tapping or reseating connectors

What to check

  • Retrieve and record any related stored DTCs from the radio/head unit and CD changer (if separately diagnosable).
  • Visually inspect the CD changer and head unit connectors for corrosion, bent pins, or loose fit. Reseat connectors.
  • Check fuses related to the radio/CD changer and verify battery supply and ground at the changer connector with a multimeter.
  • Try multiple known-good discs (audio CDs), including a clean/new disc, to rule out disc damage or format issues.
  • Open the changer (if safe and permitted) to inspect the optical lens for dust, fingerprints, or obstruction.
  • Listen for abnormal mechanical noise from the changer (stiction, grinding) when the unit attempts to focus or load a disc.

Signal parameters

  • Laser diode supply voltage (typical low-voltage supply to pickup)
  • Focus servo drive voltage / PWM control signal
  • Focus error/feedback voltage or voltage swing from pickup (servo feedback)
  • Tracking servo signal
  • Spindle motor supply voltage (drive motor for disc spin)
  • Data/communication line between radio and changer (proprietary serial or LIN/CAN depending on system)

Diagnostic algorithm

  1. Confirm the fault: record the exact message or DTC, then attempt to reproduce the failure with several known-good discs.
  2. Verify basic power and ground: check changer fuse, battery feed and ground at the changer connector; repair any supply faults.
  3. Inspect and reseat harness connectors at the changer and head unit; repair damaged pins or wiring and ensure good grounds.
  4. Visually inspect and, if accessible, clean the optical lens with a suitable, gentle optical lens cleaner or compressed air. Re-test.
  5. Measure supply voltages and signal lines at the changer connector while attempting read (laser supply, spindle motor voltage, communication line activity). Compare to service specifications if available.
  6. If focus feedback signal is absent or out of range, suspect pickup/servo electronics failure; remove changer and bench-test if repair data is available.
  7. Swap components if possible: connect a known-good CD changer or head unit (or known-good wiring) to isolate which module is at fault.
  8. If mechanical binding is suspected, inspect gears and sled movement for wear or obstruction; replace worn mechanical parts or the changer assembly as required.
  9. If laser diode is confirmed failed or intermittent and lens cleaning did not help, replacement of optical pickup or entire CD changer is often required. After repairs, clear codes and verify operation with multiple discs.

Likely causes

  • Contaminated/dusty optical lens
  • Aging/failed laser diode or pickup assembly
  • Loose connector or poor ground at the changer

Fault status

⚠️ Status
CD Changer Focus Error — changer cannot focus on disc; disc playback not available.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

B1760 B1761 B1763 B1764
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