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2008 - MX-5 - Body and Accessories

DTC B294F [POWER RETRACTABLE HARDTOP]



DTC B294F

Power retractable hardtop/deck panel limit switch malfunction

DETECTION CONDITION

There is a discrepancy in the signals from each limit switch.

POSSIBLE CAUSE

  • Foreign material caught in mechanism

  • Power retractable hardtop/deck panel limit switch malfunction

  • Open or short circuit in wiring harness between power retractable hardtop/deck panel limit switch and power retractable hardtop control module


Diagnostic procedure

STEP

INSPECTION

ACTION

1

FOREIGN MATERIAL INSPECTION
  • Is there any malfunction which stops the motor mechanically?

Yes

Go to the next step.

No

Remove foreign material.

2

INSPECT THE POWER RETRACTABLE HARDTOP/DECK PANEL LIMIT SWITCH

Yes

Go to the next step.

No

Replace the power retractable hardtop/deck panel limit switch.

(See POWER RETRACTABLE HARDTOP LIMIT SWITCH REMOVAL/INSTALLATION.)

(See DECK PANEL LIMIT SWITCH REMOVAL/INSTALLATION.)

3

INSPECT THE WIRING HARNESS BETWEEN POWER RETRACTABLE HARDTOP CONTROL MODULE AND POWER RETRACTABLE HARDTOP/DECK PANEL LIMIT SWITCH
  • Disconnect the power retractable hardtop/deck panel limit switch connector.

  • Disconnect the power retractable hardtop control module connector.

  • Inspect the following wiring harnesses for an open or short circuit.

    • Between power retractable hardtop control module connector terminal 1T and power retractable hardtop limit switch connector terminal A, and between power retractable hardtop control module connector terminal 1V and power retractable hardtop limit switch connector terminal B

    • Between power retractable hardtop control module connector terminal 1R— and power retractable hardtop limit switch connector terminal C, and between power retractable hardtop control module connector terminal 1V and power retractable hardtop limit switch connector terminal D

    • Between power retractable hardtop control module connector terminal 3F and deck panel limit switch connector terminal A, and between power retractable hardtop control module connector terminal 1V and deck panel limit switch connector terminal B

    • Between power retractable hardtop control module connector terminal 3O and deck panel limit switch limit switch connector terminal C, and between power retractable hardtop control module connector terminal 1V and deck panel limit switch connector terminal D

  • Is the wiring harness normal?

Yes

Go to the next step.

No

Repair or replace the related wiring harness.

4

INSPECT THE LIMIT SWITCH

Yes

Clear the DTC and perform the DTC inspection again.

  • If the malfunction recurs, replace the power retractable hardtop control module.

(See POWER RETRACTABLE HARDTOP CONTROL MODULE REMOVAL/INSTALLATION.)

No

Replace the middle roof panel or deck panel link.

NOTE:

  • The roof motor link is integrated with the middle roof panel.

(See MIDDLE ROOF PANEL REMOVAL/INSTALLATION.)

(See DECK PANEL DISASSEMBLY/ASSEMBLY.)


Fig.1



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