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Home >> Mazda >> 2018 >> MX-5 Miata Club, Standard Trans >> Repair and Diagnosis >> Body & Frame >> Sun Roof/T-Top/Convertible Top >> On-Board Diagnostic - Retractable Fastback Control Module >> DTC B1DA7-29; Incorrect Roof Position >> Notes
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DTC B1DA7-29; Incorrect Roof Position: Notes

Description Incorrect roof position
Detection condition
  • The retractable fastback control module detects an incorrect roof position.
Fail-safe
  • Stops retractable fastback operation
Possible cause
  • Open circuit in wiring harness between the following terminals:
    • Retractable fastback control module terminal 1G and top lock switch terminal A
    • top lock switch terminal B and body ground
    • Retractable fastback control module terminal 4B and front roof link limit switch (RH) terminal A
    • Retractable fastback control module terminal 4C and front roof link limit switch (RH) terminal B
    • Retractable fastback control module terminal 4A and front roof link limit switch (RH) terminal C
    • Retractable fastback control module terminal 4L and front roof link limit switch (LH) terminal C
    • Retractable fastback control module terminal 4M and front roof link limit switch (LH) terminal D
    • Retractable fastback control module terminal 4K and front roof link limit switch (LH) terminal B
    • Retractable fastback control module terminal 4D and rear roof link limit switch (RH) terminal A
    • Retractable fastback control module terminal 4A and rear roof link limit switch (RH) terminal B
    • Retractable fastback control module terminal 4E and rear roof link limit switch (RH) terminal C
    • Retractable fastback control module terminal 4I and rear roof link limit switch (LH) terminal A
    • Retractable fastback control module terminal 4J and rear roof link limit switch (LH) terminal B
    • Retractable fastback control module terminal 4F and rear roof link limit switch (LH) terminal C
    • Retractable fastback control module terminal 4F and rear roof link limit switch (LH) terminal D
  • Short to ground in wiring harness between the following terminals:
    • Retractable fastback control module terminal 4B and front roof link limit switch (RH) terminal A
    • Retractable fastback control module terminal 4C and front roof link limit switch (RH) terminal B
    • Retractable fastback control module terminal 4A and front roof link limit switch (RH) terminal C
    • Retractable fastback control module terminal 4L and front roof link limit switch (RH) terminal C
    • Retractable fastback control module terminal 4M and front roof link limit switch (RH) terminal D
    • Retractable fastback control module terminal 4K and front roof link limit switch (RH) terminal B
    • Retractable fastback control module terminal 4D and rear roof link limit switch (LH) terminal A
    • Retractable fastback control module terminal 4A and rear roof link limit switch (LH) terminal B
    • Retractable fastback control module terminal 4E and rear roof link limit switch (LH) terminal C
    • Retractable fastback control module terminal 4I and rear roof link limit switch (LH) terminal A
    • Retractable fastback control module terminal 4J and rear roof link limit switch (LH) terminal B
    • Retractable fastback control module terminal 4F and rear roof link limit switch (LH) terminal C
  • Retractable fastback control module malfunction
  • Top lock switch malfunction
  • Front roof link limit switch (RH) malfunction
  • Front roof link limit switch (LH) malfunction
  • Rear roof link limit switch (RH) malfunction
  • Rear roof link limit switch (LH) malfunction
Fig 1: Retractable Fastback Control Module Communication Diagram (B1DA7 29)
G11275658Courtesy of MAZDA MOTORS CORP.
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