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2008 - MX-5 - Body and Accessories

DTC B294D/B294E [POWER RETRACTABLE HARDTOP]



DTC

B294D

Roof motor opening angle does not match (Pulse count number does not match)

B294E

Deck panel motor opening angle does not match (Pulse count number do not match)

DETECTION CONDITION

  • The left and right pulse count number exceeds a certain level

POSSIBLE CAUSE

  • Foreign material caught in mechanism

  • Damage to the link

  • Open short circuit in wiring harness between roof/deck panel motor and power retractable hardtop control module

  • Roof/deck panel motor malfunction


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 the foreign material.

2

INSPECT THE ROOF/ROOF MOTOR/DECK PANEL LINK
  • Is there any damage to the roof, roof motor, or deck panel link?

Yes

Go to the next step.

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.)

3

INSPECT THE ROOF/DECK PANEL MOTOR

Yes

Go to the next step.

No

Replace the roof/deck panel motor.

(See ROOF MOTOR REMOVAL/INSTALLATION.)

(See DECK PANEL MOTOR REMOVAL/INSTALLATION.)

4

INSPECT THE WIRING HARNESS BETWEEN ROOF/DECK PANEL MOTOR AND POWER RETRACTABLE HARDTOP CONTROL MODULE
  • Disconnect the roof/deck panel motor 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 3L and roof motor connector (LH) terminal E, and between power retractable hardtop control module connector terminal 3D and roof motor connector (LH) terminal A

    • Between power retractable hardtop control module connector terminal 3A and roof motor connector (RH) terminal E, and between power retractable hardtop control module connector terminal 3I and roof motor connector (RH) terminal A

    • Between power retractable hardtop control module connector terminal 3H and deck panel motor connector (LH) terminal A, and between power retractable hardtop control module connector terminal 3P and deck panel motor connector (LH) terminal E

    • Between power retractable hardtop control module connector terminal 3M and deck panel motor connector (RH) terminal A, and between power retractable hardtop control module connector terminal 3M and roof motor connector (RH) terminal E

  • Is the wiring harness normal?

Yes

Go to the next step.

No

Repair or replace the wiring harness.

5

INSPECT THE WIRING HARNESS BETWEEN ROOF/DECK PANEL MOTOR AND POWER RETRACTABLE HARDTOP CONTROL MODULE
  • Inspect the sensor power supply wiring harness for an open or short circuit.

    • Power retractable hardtop control module connector terminal 1G—Roof motor connector (RH) terminal B

    • Power retractable hardtop control module connector terminal 1G—Roof motor connector (LH) terminal B

    • Power retractable hardtop control module connector terminal 1G—Deck panel motor connector (RH) terminal D

    • Power retractable hardtop control module connector terminal 1G—Deck panel motor connector (LH) terminal D

  • Is the wiring harness normal?

Yes

Go to the next step.

No

Repair or replace the wiring harness.

6

INSPECT THE WIRING HARNESS BETWEEN ROOF/DECK PANEL MOTOR AND POWER RETRACTABLE HARDTOP CONTROL MODULE
  • Inspect the sensor communication wiring harness for an open or short circuit.

    • Power retractable hardtop control module connector terminal 1I—Roof motor connector (RH) terminal D

    • Power retractable hardtop control module connector terminal 1M—Roof motor connector (LH) terminal D

    • Power retractable hardtop control module connector terminal 1O—Deck panel motor connector (LH) terminal F

    • Power retractable hardtop control module connector terminal 1K—Deck panel motor connector (RH) terminal F

  • Is the wiring harness normal?

Yes

Go to the next step.

No

Repair or replace the wiring harness.

7

INSPECT THE WIRING HARNESS BETWEEN ROOF/DECK PANEL MOTOR AND POWER RETRACTABLE HARDTOP CONTROL MODULE
  • Inspect the sensor ground wiring harness for an open or short circuit.

    • Power retractable hardtop control module connector terminal 1Q—Roof motor connector (RH) terminal F

    • Power retractable hardtop control module connector terminal 1Q—Roof motor connector (LH) terminal F

    • Power retractable hardtop control module connector terminal 1Q—Deck panel motor connector (LH) terminal B

    • Power retractable hardtop control module connector terminal 1Q—Deck panel motor connector (RH) terminal B

  • Is the wiring harness normal?

Yes

Replace the power retractable hardtop control module.

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

No

Repair or replace the wiring harness.




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