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DTC: 09-Er21; AUDIO UNIT INTERNAL MALFUNCTION: Notes

DETECTION CONDITION AND PAUSIBLE CAUSES

Description Audio unit internal malfunction
Detection condition
  • Audio unit internal ECU (Power amplifier peripheral circuit) is faulted.
  • Audio unit protection function operates due to short to ground in speaker wiring harness and speaker lead wire
Fail-safe Not applicable
Possible cause
  • Audio unit connector or terminals malfunction
  • Speaker connector or terminals malfunction
  • Short to ground in wiring harness between the following terminals:
    • Audio unit terminal 1A-Front door speaker (LH) terminal C
    • Audio unit terminal 1C-Front door speaker (LH) terminal B
    • Audio unit terminal 1D-Front door speaker (RH) terminal C
    • Audio unit terminal 1F-Front door speaker (RH) terminal B
    • Audio unit terminal 1S-Rear door speaker (LH) terminal C
    • Audio unit terminal 1U-Rear door speaker (LH) terminal B
    • Audio unit terminal 1V-Rear door speaker (RH) terminal C
      • Audio unit terminal 1X-Rear door speaker (RH) terminal B
  • Open circuit in wiring harness between the following terminals:
    • Audio unit terminal 1A-Front door speaker (LH) terminal C
    • Audio unit terminal 1C-Front door speaker (LH) terminal B
    • Audio unit terminal 1D-Front door speaker (RH) terminal C
    • Audio unit terminal 1F-Front door speaker (RH) terminal B
    • Audio unit terminal 1S-Rear door speaker (LH) terminal C
    • Audio unit terminal 1U-Rear door speaker (LH) terminal B
    • Audio unit terminal 1V-Rear door speaker (RH) terminal C
      • Audio unit terminal 1X-Rear door speaker (RH) terminal B
  • Speaker malfunction
  • Audio unit malfunction
Fig 1: Audio Unit Communication Diagram
G11430316Courtesy of MAZDA MOTORS CORP.